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Vehicle Loading Identification and Its Characteristics of Sutong Bridge in Operation Chen Airong，Ma rujin，Xu Yanmei 2013, 32(增1): 729-733.  DOI: 10.3969/j.issn.1674-0696.2013.sup.1.01 Abstract ( )   PDF (710KB) ( )   Vehicle load is the most important live load for bridges to bear． In the case of orthotropic steel box girder of longspan bridges，vehicle load will play a very significant role in its long-term fatigue properties． Especially with the numerous vehicles being overloaded repeatedly，the steel box girder fatigue becomes an increasingly prominent issue． In order to predict the fatigue properties of orthotropic steel box girder，the characteristics of vehicle loading need to be comprehensively investigated． The characteristics of vehicle loading on Sutong Bridge are obtained，based on the data from toll collection system． Meanwhile，regular pattern of vehicle transverse distribution is identified by the dynamic image identification technique from video recorded by the bridge monitoring equipment． Means and methods of the research will provide a reference for vehicle loading study of the large-scale bridges which lack of WIM system． References | Related Articles | Metrics

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Application of Contemporary Programming Techniques in Structural Health Monitoring Software System Shan Deshan，Wang Ｒui，Dong Jun，Yang Jingchao，Zhang Shaoxiong，Li Qiao 2013, 32(增1): 734-737.  DOI: 10.3969/j.issn.1674-0696.2013.sup.1.02 Abstract ( )   PDF (519KB) ( )   In order to obtain more information of bridge condition from the field data，Microsoft Visual Studio 2010 and SQL Server 2008 were employed as the developing tools to develop the software system for bridge health monitoring based on the ． NET Framework 4． 0 and Windows 7 operation system． Windows Presentation Foundation ( WPF) interface framework，Model-View-View Model ( MVVM) Framework，Server Management Objects ( SMO) ，CODE FIＲST and Multithread Techniques， were adopted． With modern programming techniques mentioned above and bridge technical and maintenance specification，one specific health monitoring software system of suspension spanning structure for one certain oil and gas pipeline was developed． The design of health monitoring software system was presented herewith from aspects of the development goal，contemporary programming techniques，framework design，function design，database design and key technologies． Some experimental measurements were adopted to test and verify the specific software，and the results show that the system owns powerful data analysis and processing capability and can make rational and correct decision for early warning and assessment of suspension spanning tructure． References | Related Articles | Metrics

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Causes of Common Diseases of CFST Arch Bridge Zhou Shuixing，Li Wei 2013, 32(增1): 738-741.  DOI: 10.3969/j.issn.1674-0696.2013.sup.1.03 Abstract ( )   PDF (530KB) ( )   Many diseases appeared in the operation stages of domestic concrete-filled steel tubular ( CFST) arch bridges， including debonding between steel tubular and concrete，corrosion，part deformation of tubular，corrosion and rupture of suspender as well as strong vibration． And then the disease causes were discussed from the aspects of structure，material， construction，maintenance and mechanics． Finally，some design suggestions on CFST arch bridge are proposed． References | Related Articles | Metrics

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Overall Situation and Typical Diseases of Medium and Small Span Concrete Bridges in Zhejiang Province Zhang Bin，Zhu Dong，Xu Jianwei，Tian Hao 2013, 32(增1): 742-745.  DOI: 10.3969/j.issn.1674-0696.2013.sup.1.04 Abstract ( )   PDF (382KB) ( )   The medium and small span concrete bridges in Zhejiang Province were comprehensively investigated． Classification and statistical analysis with respect to the medium and small span concrete bridges in Zhejiang Province was carried out based on the bridge span，the construction period，superstructure，load，technical position and location of main diseases． Thus，the typical diseases of cast-in-place and prefabricate plate girder bridges，which were very plentiful，were introduced in detail． The research results can be used as basic technical data for the research of structural real-time monitoring，maintenance and management with respect to the medium and small span concrete bridges． References | Related Articles | Metrics

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Design of Anti-Corrosion of Concrete Bridge Sun Hongyao，Yang Zheng，Xu Xuefeng，Xu Ning 2013, 32(增1): 746-751.  DOI: 10.3969/j.issn.1674-0696.2013.sup.1.05 Abstract ( )   PDF (370KB) ( )   In designing high durability concrete，auxiliary durability protective measures of the reinforced concrete should be taken． The method of environmental classification was introduced，and the applicable anti-corrosion measures under different environmental conditions were put forward． Meanwhile，several new materials and new technologies developed were briefly introduced． Finally，the recommendation that the concrete structure designer should improve the communication with corrosion resistant designer was proposed． References | Related Articles | Metrics

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Buffeting-Induced Fatigue Damage Analysis on the Stayed Cables of Long-Span Steel Truss Cable-Stayed Bridge He Xuhui，Cheng Hao，Li Guangqiang 2013, 32(增1): 752-755.  DOI: 10.3969/j.issn.1674-0696.2013.sup.1.06 Abstract ( )   PDF (385KB) ( )   Taking the Yujiang river steel truss cable-stayed bridge on Nan-Guang ( Nanning to Guangzhou) railway as an example， a method considering the nonlinearity of the stayed cable was proposed to predict the buffeting response of long-span bridge，which was developed on the basis of ANSYS． In this method，one-dimension stochastic wind fields were simulated by use of harmonic synthesis method． Based on the simulated wind fields，the buffeting time-histories response of typical stayed cable was obtained． And the fatigue damage of stayed cable was also obtained on the basis of S-N curve and Miner criterion． The results show that the buffeting-induced fatigue damage of the stayed cable is small，and comparing with the angle of wind deflection，the influence of wind speed on the stress and the fatigue damage of the stayed cable is bigger． References | Related Articles | Metrics

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Simulation Analysis on Seismic Performance of Corroded Ｒeinforced Concrete Bridge Pier Ma Shuwei，Wang Dalei，Hu Teng 2013, 32(增1): 756-759.  DOI: 10.3969/j.issn.1674-0696.2013.sup.1.07 Abstract ( )   PDF (557KB) ( )   Corroded reinforced concrete bridge pier is in the dangerous state for seismic resistance，so it is especially important to study its anti-seismic hysteretic performance． The degeneration mechanism of corroded reinforced concrete structure was analyzed，considering the reduce of rebar cross-section area，the decrease of the yield stress of the rebar and the degeneration of bond relationship between rebar and concrete． Through establishing FEM model of corroded reinforced concrete bridge pier，the hysteretic curve，skeleton curve and the dissipation capacity under low-cycle lateral loading were analyzed． The calculation results fit well with the test results，which verifies the seismic hysteretic performance of corroded reiforced concrete bridge pier． References | Related Articles | Metrics

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Current Situation and Development for Detection and Bearing Capacity Evaluation of Main Cable of Suspension Bridge Chen Xiaoyu，Shen Ｒuili，Tang Maolin 2013, 32(增1): 760-763.  DOI: 10.3969/j.issn.1674-0696.2013.sup.1.08 Abstract ( )   PDF (526KB) ( )   Through analyzing the characteristics of the main cable detection of suspension bridge，and the main factors which affected the carrying capacity of the cable during every stage，a detailed discussion on the influence of steel corrosion，broken wires and the secondary stress on the carrying capacity of the main cable was carried out． Meanwhile，the existing evaluation mode of the main cable bearing capacity was reviewed． Finally，based on the reliability method，a research thought considering the total life cycle and the various factors that affected the bearing capacity of the main cable was proposed． References | Related Articles | Metrics

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Durability Assessment of Ｒeinforced Concrete Bridge in Chloride Environment Liu Xiang，Liu Zhiwen 2013, 32(增1): 764-768.  DOI: 10.3969/j.issn.1674-0696.2013.sup.1.09 Abstract ( )   PDF (428KB) ( )   The durability assessment of reinforced concrete bridges in chloride environment was focused． Based on the model of durability assessment of reinforced concrete structures，the program for assessment of the durability of reinforced concrete bridges was developed with Visual Basic 6． 0． The durability of a reinforced concrete bridge in chloride environment was assessed with the proposed program． The research results indicate that，the assessment results of reinforced concrete bridges with code for durability design on concrete structure of railway are considered to be conservative，compared with DuraCrete LＲFD method; in the factors which influence the durability of reinforced concrete structures，the chloride environment is worse than carbonation environment; the durability of concrete structures can be improved greatly by increasing the cover thickness of concrete． References | Related Articles | Metrics

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Time-Dependent Ｒeliability Analysis on In-Plane Stability of Concrete-Filled Steel Tubular Arches Jiang Wei，Lv Dagang 2013, 32(增1): 769-771.  DOI: 10.3969/j.issn.1674-0696.2013.sup.1.10 Abstract ( )   PDF (513KB) ( )   To investigate the influences of uncertainties on the in-plane creep stable bearing capacity of CFST arches，the time-dependent limit state function was established． The time discretized-integrated approach and the one-time reliability method were combined，therefore，the curve of the in-plane stability reliability indices changed with the time and corresponding sensitivity indices of CFST arches were obtained． The results show that: with the deterioration of in-plane stable bearing capacity caused by concrete creep，the reliability of CFST arches decreases significantly; the outer diameter of the steel tubular has the most important influences on reliability index and it is followed by the elastic modulus of steel，the elastic modulus of concrete，the thickness of steel tubular and the creep coefficient of concrete; the effects of concrete creep on in-plane stability of CFST arches are significant，which should be considered in design． References | Related Articles | Metrics

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Evaluation of Security Grade of Fatigue Crack of Steel Box Girder Cheng Miao，Ji Bohai，Fu Zhongqiu，Shen Danwen，Zhu Wei 2013, 32(增1): 772-775.  DOI: 10.3969/j.issn.1674-0696.2013.sup.1.11 Abstract ( )   PDF (304KB) ( )   Ｒeferring to the existing evaluation methods，a fuzzy comprehensive evaluation method was applied in the evaluation of the security grade of the fatigue crack of steel box girder． According to the structural characteristics of the steel box girder，corresponding factors set and appraisal set were determined，and then mathematical model was established． Therefore， the weighting of each evaluation index is determined and corresponding evaluation standards were also classified． According to the proposed standard，the evaluation of the security grade of fatigue crack of steel box girder can be performed． References | Related Articles | Metrics

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Comparison of Monte Carlo Simulation and OＲDEＲ Algorithm in Calculation of Network Ｒeliability Yue Yanchao，Ma Jianxun，Gao Jian，Zhang Shuoying，Zhang Lingling 2013, 32(增1): 776-778.  DOI: 10.3969/j.issn.1674-0696.2013.sup.1.12 Abstract ( )   PDF (293KB) ( )   Monte Carlo simulation and OＲDEＲ algorithm were used and compared in getting the connectivity reliability for a medium-sized bridge network． The results show that OＲDEＲ algorithm can give more accurate bounds of connectivity reliability for network with higher reliable components，while the computation time of Monte Carlo simulation is shorter than OＲDEＲ algorithm． The results can assist the government officers understand the bridge network status better． References | Related Articles | Metrics

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Calculation Method of Checking Coefficient of Spandrel-Filled Arch Bridges Based on Appearance Investigation Pan Cong，Liao Bihai 2013, 32(增1): 779-783.  DOI: 10.3969/j.issn.1674-0696.2013.sup.1.13 Abstract ( )   PDF (426KB) ( )   Firstly，the shortages of existing specifications in evaluating the checking coefficient of spandrel-filled arch bridges were analyzed，and the disease forms and distribution rules were summed up，with the combination of several case studies of reinforcing spandrel-filled arch bridges． The major influential factors of the checking coefficient in existing bridges were determined by analytic hierarchy process，which included the abutment displacement，diseases of the main arch ring and deviation of the arch axis． The secondary fuzzy synthetic evaluation method of the checking coefficient was established according to the fuzzy mathematical theory． Therefore，a fast method to calculate the checking coefficient was proposed on the basis of the appearance investigation of spandrel-filled arch bridges． Lastly，the VB language was adopted to program and visualize the proposed fast calculation method，in order to promote this method in engineering practice． References | Related Articles | Metrics

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Structural Characteristics of Cable-Stayed Bridge under Blast Loads Zhang Tao，Ma Ｒujin，Chen Airong 2013, 32(增1): 784-787.  DOI: 10.3969/j.issn.1674-0696.2013.sup.1.14 Abstract ( )   PDF (685KB) ( )   The basting loading capabilities of the main girder of a long-span cable-stayed bridge after different levels of explosives explosion on the inner lane and the outer lane have obtained by using fluid-structure interaction analysis． The analysis models of concrete girder and part of girder were established，and the damage of main girder after different levels of explosives explosion was analyzed． The results show that damage scope is mainly affected by the quality of the explosion and the type of main girder; and it has small relevance with the location of explosion． Full-bridge model is established to perform dynamic analysis，and the results show that axial stress of main girder have little change during vibration; the cables close to the explosion have the high risk of break． References | Related Articles | Metrics

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Typical Damage and Ｒeinforcement Method for Steel Truss Ｒailway Bridge with Orthotropic Deck Wei Xing，Li Jun，Jiang Su，Shao Kefu，Liao Ping 2013, 32(增1): 788-791.  DOI: 10.3969/j.issn.1674-0696.2013.sup.1.15 Abstract ( )   PDF (610KB) ( )   Taking an old steel truss railway bridge with 32 m orthotropic deck as the research object，typical crack damages were classified and investigated． By using shell element in ANSYS，3D finite element model was established． Considering the common and extreme load case，different mechanical behaviors of the bridge were analyzed． Based on Chinese railway steel bridge design code，fatigue stress range of the welded connection，where crack occurs，was obtained by calculation． Through investigating the structure characteristics and mechanical behaviors of typical welded connection respectively，and combining with the simulation results，the causes of fatigue crack in different structural detail were analyzed． Focusing on the specific characteristics of various diseases，the reinforcement method steel truss railway bridge with orthotropic deck was proposed based on the reinforcement cases home and abroad． Ｒesearch results show that welding defects，unforeseen deformations and bearing cavity may cause diseases and cracks of this kind of steel bridges． The stresses at welded detail are improved by splicing angle steel with high-strength bolts，which can improve the fatigue performance and the reinforcement of the structure． References | Related Articles | Metrics

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FＲP Ｒeinforcement for Concrete Bridge Structure of Deficient Concrete Strength Class Cui Xuechang，Zhang Xixiang 2013, 32(增1): 792-798.  DOI: 10.3969/j.issn.1674-0696.2013.sup.1.16 Abstract ( )   PDF (654KB) ( )   The structural principle，structural effects and engineering application results of fiber reinforced polymer ( FＲP) reinforcement for concrete bridge when the concrete strength classification was deficient were introduced． It was also pointed out that FＲP reinforcement method was a simple and effective way to make such a defective structure into an acceptable one． References | Related Articles | Metrics

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Experimental Ｒesearch on ＲC T Beams Strengthened with Double Prestressed CFＲP Strip Zhuo Jing，Yang Hong 2013, 32(增1): 799-802.  DOI: 10.3969/j.issn.1674-0696.2013.sup.1.17 Abstract ( )   PDF (596KB) ( )   In order to meet the need of strengthened bridge of large tonnage prestressed CFＲP，BXM502D which can anchor double CFＲP strips was developed． Through the static anchoring assembly breaking test，it was verified that the BXM502D anchorage capacity could reach above 600 kN． Experimental research for large proportion of T beam strengthened with prestressed double CFＲP strips were designed，the double CFＲP strips were tensioned 300 kN by the anchorage BXM502D． The test results show that double prestressed CFＲP plates can significantly improve the original structure of cracking，yielding load，and greatly improve the ultimate bearing capacity of the structure References | Related Articles | Metrics

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Vibration and Fatigue Behavior of Concrete Arch Bridge Zhao Hanwei，Han Xi， 2013, 32(增1): 803-806.  DOI: 10.3969/j.issn.1674-0696.2013.sup.1.18 Abstract ( )   PDF (483KB) ( )   The current situation of arch bridge vibration research and the current situation of concrete arch bridge fatigue research under overloaded vehicles were described． The significance of fatigue analysis on the concrete arch bridge was discussed with the consideration of the enlargement of the bridge vibration． A new thought that the problem of the fatigue of highway arch bridge is solved by controlling bridge vibration is proposed，and the solutions for the diseases of the small-span and medium-span arch bridge in mountainous area are also discussed． References | Related Articles | Metrics

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Disease Analysis and Ｒeinforcement of Concrete Bridge Substructure He Xiaoyang，Xiang Yiqiang，Xing Cheng 2013, 32(增1): 807-811.  DOI: 10.3969/j.issn.1674-0696.2013.sup.1.19 Abstract ( )   PDF (480KB) ( )   Main types of the pier，abutment and foundation in substructure of ＲC or PC bridges in China were summarized respectively． It was pointed out that the main diseases in substructure of concrete bridges were differential settlement of foundations， insufficient carrying capacity，durability diseases of reinforced concrete，cracking of concrete pier columns，bent caps and abutments etc． ． In allusion to the concrete pier，abutment and foundation，the causes and mechanisms of these diseases were analyzed from the design，construction，maintenance and operation of bridges． The relevant maintenance and strengthening methods were also discussed，such as the foundation enlargement method，adding pile method and artificial foundation reinforcement method for concrete and ＲC pier or abutment foundation; the method of ＲC columns reinforced by reinforced concrete hoop or FＲP for piers，the reinforcement method of pasting steel strips or plates，the method of external prestressed reinforcement and additional support method，etc． for ＲC bent caps; the method of reducing load，the method of reducing filling height by adding approach spans，the support beam method and the reinforcement method of installing auxiliary retaining wall，etc． for ＲC abutments． References | Related Articles | Metrics

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Strengthening and Ｒebuilding Method of the Transverse Deck Arch Bridge Wang Shaorui，Zhou Zhixiang，Gao Yanmei 2013, 32(增1): 812-814.  DOI: 10.3969/j.issn.1674-0696.2013.sup.1.20 Abstract ( )   PDF (677KB) ( )   Taking Jiuqu Ｒiver Bridge reinforcement project as the research background，the main diseases of transverse deck arch bridge were summarized，and the main causes of the disease were analyzed deeply． According to main diseases and defects of the structure，three kinds of different reinforcement schemes were put forward． Through the comparison of the schemes，the scheme“strengthening construction on the arch structure and changing horizontal spread the carriageway plate into longitudinal laying by use of the arch rib”was considered to be more economic and safer，which improved fundamentally the defects of transverse deck． According to“as soon as possible”requirements of construction side，a construction method of demolition and reconstruction span by span was put forward． Comparing with the disposable demolition construction on the arch reconstruction，the demolition and reconstruction span by span can effectively shorten the construction period and reduce construction risk; meanwhile，the forcing system of the structure has little change． References | Related Articles | Metrics

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Ｒeinforcement and Ｒeducing Load on Extrados of the Small-Span Solid-Type Stone Arch Bridge Gao Kai，Zhou Jianting，Liu Lu 2013, 32(增1): 815-817.  DOI: 10.3969/j.issn.1674-0696.2013.sup.1.21 Abstract ( )   PDF (485KB) ( )   Based on the method of enlarging section of reinforced concrete and reducing load on arches，the feasibility of the method of reinforcement and reducing load which was used to reinforce the small-span solid-type stone arch bridge was analyzed， and the application of the method on the small-span stone arch bridge in projects was also confirmed． Besides，the bearing capacity of the back arch rings was analyzed before and after reinforcement; meanwhile，this proposed reinforcement method was compared with other reinforcement methods in improving the bearing capacity of main arch rings． References | Related Articles | Metrics

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Deviation Analysis on Large Deflection of Continuous Ｒigid Frame Bridge’s in Post-Construction Li Qingtong，Zhou Zhixiang，Liu Xiaoyu 2013, 32(增1): 818-822.  DOI: 10.3969/j.issn.1674-0696.2013.sup.1.22 Abstract ( )   PDF (550KB) ( )   Based on the domestic and foreign long-span continuous rigid frame bridge with the emergence of embarrassment and harm of the large deflection of mid-span currently，three kinds of deviation were introduced，such as design deviation， construction deviation，as well as deviation between design and construction． Then from the point of three kinds of deviation， the causes for large deflection of continuous rigid frame bridge’s mid-span were discussed，and the corresponding countermeasures were also put forward，which can provide some references for the design and construction of continuous rigid frame bridge． References | Related Articles | Metrics

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Key Technology of External Prestressing Ｒeinforced Concrete Arch Bridge Chen Zengshun，Zhou Jianting，Zhang Cheng，Liu Simeng，Song Jun 2013, 32(增1): 823-826.  DOI: 10.3969/j.issn.1674-0696.2013.sup.1.23 Abstract ( )   PDF (564KB) ( )   A new strengthening technical solution for the reinforced concrete arch bridge was put forward． The train of thought，method and construction of the prestressed reinforced concrete arch bridge was elaborated firstly． Then，the principle of reinforcement and calculation points was discussed． Finally，a bridge was analyzed and calculated by the large scale simulation software Midas Civil before and after reinforcement． The calculation and analysis results show that the proposed reinforcement method has the advantages，such as，good results，high social benefit，simple to handle and economize． References | Related Articles | Metrics

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Anti-Seismic Performance of Ｒectangular Hollow Section of Bridge Pier with FＲP Confinement under Ｒeversal Load Dong Zhenhua，Jia Junfeng，Han Qiang 2013, 32(增1): 827-831.  DOI: 10.3969/j.issn.1674-0696.2013.sup.1.24 Abstract ( )   PDF (801KB) ( )   In order to estimate the anti-seismic performance of FＲP-confined ＲC bridge pier with hollow section，five unconfined and confined bridge piers with rectangular hollow section were designed and established． And then quasi-static experiment was carried out under constant axial compression and unidirectional horizontal reversal load． Comparing hysteretic curves，lateral force and ductility as well as energy dissipation of different specimen piers，it is shown that through confining plastic hinge region of the tested bridge pier by FＲP，lateral rigidity and ultimate displacement are increased; energy dissipation and ductility are improved． However，it has more considerable effective ductility than load capacity． Besides，variation trend of dissipation coefficient is different with total energy dissipation． Therefore，dissipation energy coefficient and total energy dissipation should be considered at the same time to estimate energy dissipation ability of ＲC hollow section bridge pier． References | Related Articles | Metrics

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Analysis and Countermeasures of Mass Concrete Abutment Hydration Heat Cracking Liu Qingyang，Zhang Liyong 2013, 32(增1): 832-835.  DOI: 10.3969/j.issn.1674-0696.2013.sup.1.25 Abstract ( )   PDF (500KB) ( )   In view of the influences and diseases the mass concrete hydration heat had caused，the influence the hydration heat of mass concrete brings to the structure and the countermeasures for disease were studied． Taking the disease situation of a 2 × 30． 0 m prestressed concrete continuous box girder bridge abutment in the construction process as the research object， the influence and causes which the hydration heat brings to the structure were analyzed by adopting the combination of theory and finite element modeling method． Finally，the hydration heat disease treatment countermeasures were proposed， which had reference significance for mass concrete construction in the future． References | Related Articles | Metrics

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Influence of Widening and Ｒenovation on Mechanical Performance of Old Bridges Chang Guoqiang，Zhang Changqing，Hu Wenhua，Wang Peng 2013, 32(增1): 836-838.  DOI: 10.3969/j.issn.1674-0696.2013.sup.1.26 Abstract ( )   PDF (604KB) ( )   Concrete T-beam and hollow slab bridges have been constructed at mountainous areas since years ago，which have to be widened currently due to mass increase traffic volume． By use of load lateral distribution factor ( LLDF) ，the influence of different widening method on the force of bridges with small or medium span was analyzed by beam-and-girder method． The research results indicate that reasonable widening methods can efficiently reduce the potential load bearing capacity and indirectly improve the load bearing capacity of old bridges，which efficiently reduces the construction cost． References | Related Articles | Metrics

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Influence Parameters of Stability of Continuous Ｒigid Frame Bridge with Long Span and High Piers in Mountainous Area Bai Wulong，Zhang Yu，Shi Xuefei，Ｒuan Xin 2013, 32(增1): 839-843.  DOI: 10.3969/j.issn.1674-0696.2013.sup.1.27 Abstract ( )   PDF (711KB) ( )   On the basis of a continuous rigid frame bridge，the numerical model was established with the finite element software ANSYS，and the degree of the influence of initial imperfections，load factors and structural design parameters on the stability of the continuous rigid frame bridge with long span and high piers in construction stage in mountainous area was discussed． Disciplines and causes of different parameters affecting the stability of the continuous rigid frame bridge with long span and high piers in construction stage were also discussed． The results show that initial geometrical imperfections，initial material imperfections，wind load，temperature load，unbalanced construction load and strength of materials impose great influence on the stability of the structure in construction; some proper measures should be taken to assure the stability and safety of the structure in construction stage． References | Related Articles | Metrics

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Overall Vehicle Load Ｒesponse of Multi-Pylon Cable Stayed Bridge Zhou Junyong，Shi Xuefei，Ｒuan Xin 2013, 32(增1): 844-847.  DOI: 10.3969/j.issn.1674-0696.2013.sup.1.28 Abstract ( )   PDF (524KB) ( )   Taking a hex-pylon cable stayed bridge at home as the research object，the method and technology for calculating the overall vehicle load response were introduced． And then the characteristics response and response duration of the overall performance of the control structure under diverse traffic conditions were analyzed． The calculation results were compared with those in the vehicle load value of current bridge criterion ( JTG D 60—2004) ． Ｒesults show that: the extreme response values of the researched hex-pylon pylon cable stayed bridge under diverse traffic conditions are obviously smaller than those in the current bridge criterion，and it is of sufficient reserve of the vehicle load for the researched bridge in the term of current design; vehicle load response characteristics of multi-pylon cable stayed bridge are closely related with the daily traffic volume and the ratio of truck; different responses indicate different sensitiveness for the vehicle load modes and values． So， in order to reflect the actual vehicle load response，the vehicle load model with multi-level of multiple parameters is proposed to be established，which can optimize the design of multi-pylon cable stayed bridge． References | Related Articles | Metrics

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Impact Coefficient of Long-Span Suspension Bridge Wang Xiaosong，Cui Jiangong 2013, 32(增1): 848-851.  DOI: 10.3969/j.issn.1674-0696.2013.sup.1.29 Abstract ( )   PDF (731KB) ( )   Based on the equivalent principle for static response of bridge，car distribution was determined according to the lane load of current specification，in the engineering background of Chongqing Qingcaobei river bridge． Car-bridge coupling analysis was then performed under various running speeds and road roughness． And the impact coefficients of various correlative programs of the bridges were obtained． The adaptability of the impact coefficients of the current specification was evaluated． The results show that impact coefficients of current specification are inclined to be dangerous for certain member forces of long-span suspension bridge． References | Related Articles | Metrics

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Simulation Analysis on the Construction Process of Arch Ｒibs of Long-Span Steel Tube Skeleton Arch Bridge Zhang Erhua，Huang Zhen 2013, 32(增1): 852-855.  DOI: 10.3969/j.issn.1674-0696.2013.sup.1.30 Abstract ( )   PDF (529KB) ( )   The rib construction of large-span steel tube concrete arch bridge is a complex course． In order to ensure that the final bridge line and the forced status can meet the design and checking requirements，it is needed to adopt the simulation of the construction control． Under the background of a deck concrete-filled steel tube arch bridge whose span was 140 meters， a simulation analysis on the construction progresses of the rib was carried out by using the finite element structural computation theory and computer technology． The actual steps of simulation calculation were given and a conclusion was also obtained that the stress of the top longitudinal bracing rods near arch foot is larger during the simulation analysis，which provides reference for the same kind of bridge construction． References | Related Articles | Metrics

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Dual Non-Linear Stability Ｒesearch on Long-Span Concrete-Filled Steel Tubular Arch Bridge Han Xing，Zhu Bing，Zhang Lei，Zhu Jianbo，Xiang Baoshan 2013, 32(增1): 856-859.  DOI: 10.3969/j.issn.1674-0696.2013.sup.1.31 Abstract ( )   PDF (473KB) ( )   Taking Yachihe bridge as the engineering background，the stability performance about the large span concrete filled steel tubular arch bridge under the material and geometrically dual nonlinear condition was studied． The stability safety factors and displacement condition of apex of arch were compared and analyzed，considering geometric nonlinearity and double nonlinear respectively． And the influence factors，such as the cross arm and skew angle，on the stability of the bridge were also analyzed． The results indicate that the safety factor of the stability in the double nonlinear stability of bridge has a certain decline，compared with that in elastic state． So the double nonlinear effect on the bridge stability can’t be ignored in actual engineering． And there is little sense to separately consider the geometric nonlinear． References | Related Articles | Metrics

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Impact Coefficients of Ｒigid-Frame Arch Bridge Wu Haijun，Zhang Yan，Zhang Hao，Zhao Wenxiu， 2013, 32(增1): 860-863.  DOI: 10.3969/j.issn.1674-0696.2013.sup.1.32 Abstract ( )   PDF (493KB) ( )   The impact effect of the reinforced concrete rigid-frame arch bridge has a great effect on its safety and disease development． A reasonable impact coefficient plays a great role in the disease analysis and the reinforcement of rigid-frame arch bridges． The differences of bridge design specifications on the impact coefficient calculation method at different stages in China were discussed． The dynamic characteristics of a typical rigid-frame arch bridge were analyzed by using the calculation method of Three-Dimensional Finite Element． And a comparative analysis was made between the impact coefficients calculated respectively according to the 1985 version specification and the 2004 version specification． Then the difference between the impact effect measured and the impact effect calculated was analyzed according the measured data of a rigid-frame arch bridge’s dynamic loading test． The analysis shows that the impact coefficients calculated according to the 1985 version specification nearly matches the measured data; however，the impact coefficients calculated according to the 2004 version specification is able to conservatively cover the distribution of the impact coefficients in various situations． References | Related Articles | Metrics

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Deformation and Mechanical Characteristics of Curved Girder Continuous Ｒigid Frame Bridge Wang Fan，Zhu Bing，Dou Shengtan，Suo Wenjia，Zhao Ning，Huang Ｒuifeng 2013, 32(增1): 864-868.  DOI: 10.3969/j.issn.1674-0696.2013.sup.1.33 Abstract ( )   PDF (893KB) ( )   The prestressed concrete continuous rigid frame straight beam model and the bending beam model were established by the finite element software MIDAS /Civil，with the same span and variable cross-section single cell box． The deformation， the reaction force and stress behaviours were analyzed under the influence of dead load and live load and at the operation stage of bridge． At the same time，the modelling method that may cause differences in the final results was considered， so the grillage method was adopted to do the modelling analysis for the curved girder． The obtained results are regarded as important reference to verify the accuracy of data，which finds out the differences of the curved girder bridge and straight girder bridge in the force and deformation． Therefore，the mechanical characteristics of the curved girder bridge are analyzed more accurately． References | Related Articles | Metrics

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Static and Dynamic Characteristics of Crescent Arch Bridge Shi Zhou，Guo Junli，Su Weifeng，Pu Qianhui 2013, 32(增1): 869-872.  DOI: 10.3969/j.issn.1674-0696.2013.sup.1.34 Abstract ( )   PDF (567KB) ( )   Taking a landscape bridge — crescent arch bridge in a city as the engineering background，the spatial finite beam and link element model of full bridge was established by Medias Civil． The structure performance under static loads， the dynamic characteristics and stability performance were analyzed in detail． The analysis results show that: the spatial structure of the bridge span is reasonable with good rigidity and strength; the structural fundamental vibration mode is horizontal first order with the frequency value as 0． 93 Hz; the stability safety factors of major construction phase are all greater than 4． 0，so the structure has good stability． References | Related Articles | Metrics

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Static and Dynamic Analysis on Fly-Swallow Type Arch Bridge Shi Zhou，Su Weifeng，Guo Junli，Pu Qianhui 2013, 32(增1): 873-878.  DOI: 10.3969/j.issn.1674-0696.2013.sup.1.35 Abstract ( )   PDF (587KB) ( )   Fly-swallow type arch bridge has characteristics of strong spanning，high carrying capacity，self-balancing thrust， strong adaptability and elegant structure． According to a new three-span continuous self-anchored fly-swallow type basket CFST arch bridge，the space bar finite element model of the bridge was established using Finite Element Analysis software Midas Civil and space mechanical characteristics of the arch bridge were analyzed，so as to access the structure static，dynamic characteristics and the stability of construction process as well as the finished bridge． Through comparative analysis， the resistance of both main arch ribs and side span were greater than the combination of axial force． At the same time，the stability safety factors of structure on various main construction stages were greater than 4． So the static and dynamic characteristics of the arched bridge are of high performance，which meets the requirements of the design specifications． References | Related Articles | Metrics

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Construction Ｒisk Analysis on a Steel Box Girder Bridge Crossing above Existing Ｒailway Wu Chunwu，Lu Wenliang，Xu Linfeng，Bai Cunxian 2013, 32(增1): 879-883.  DOI: 10.3969/j.issn.1674-0696.2013.sup.1.36 Abstract ( )   PDF (590KB) ( )   A steel box girder bridge on passenger railway line is crossing above the existing railway，and part of the pier construction is adjacent to the existing line and higher than the top surface of existing bridge． So the incremental launching method is used to erect the steel box girder． According to the construction program，the construction process characteristics were analyzed in detail，and the risk factors of construction were identified． And then the importance of the identified risk factors was ranked by the Analytic Hierarchy Process method． Finally，based on the researched conclusions，some suggestions were given for construction of the bridge． References | Related Articles | Metrics

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Null Live Load Point Identification Method of Continuous Ｒigid Frame Bridges Based on Monitoring Data Wu Haijun，Wei Yue，Huang Youbang，Wang Shenning，Zhou Zhixiang 2013, 32(增1): 884-887.  DOI: 10.3969/j.issn.1674-0696.2013.sup.1.37 Abstract ( )   PDF (508KB) ( )   By analyzing and introducing the current situation and the problems in data analysis of bridge health monitoring， a null point identification method of live load for bridge structure based on the long-term monitoring data was proposed． The time from 2: 00 to 4: 00 in every morning was set as the data screening period，and the null points of live load were taken when the stress of the roof and floor were both minimum． By determining a null point of live load as the reference state daily， and the obtained point was taken as referential point to deal with the monitoring data daily． The proposed method greatly reduces the impact of the cumulative error and the uncertainty of temperature on the processing of monitoring data． References | Related Articles | Metrics

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Damage Mechanism and Prevention Countermeasures of HDPE Protecting Sheath of Stayed Cables Liu Shanhong 2013, 32(增1): 888-893.  DOI: 10.3969/j.issn.1674-0696.2013.sup.1.38 Abstract ( )   PDF (513KB) ( )   The temperature gradient is formed when the sun is shining on the HDPE sheath of conventional stay-cables，and the non-uniform deformation is formed on the cross-section of the sheath． In addition to both anchoring ends，the long seamless sheath structure form leads to produce ring and longitudinal cracks inevitably． The common protection method of staycables breakage mechanism and typical stayed cables protective layer structure were analyzed in theoretically． Ｒigid transition layer and sunshade system were added into the protection sheath as structural measures． The proposed method can reduce the amplitude of HDPE tube stress，prolong the service life of stayed cables protection sheath and save the maintenance costs． References | Related Articles | Metrics

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Evolution Analysis on Global Performance of Prestressed Continuous Bridge in Lifetime Ye Wenya，Li Guoping，Fan Lichu 2013, 32(增1): 894-898.  DOI: 10.3969/j.issn.1674-0696.2013.sup.1.39 Abstract ( )   PDF (772KB) ( )   In order to research the mechanical performance of the prestressed continuous girder after damage under the extreme condition of the carrying capability and the common use，the time-varieties of concrete，including shrinking and creeping， were taken into consideration，on the basis of material，cross-section and components． The comprehensive analysis on the global performance evolution of the structure was carried out by changing the damage time and damage amount． And the displacement evolution in the span，the relative relationship evolution between the anti-bending carrying capability and loading response，the stress evolution of the controlled cross-section and the evolution rule of the prestressed value of the actual bridge structure in lifetime are obtained． References | Related Articles | Metrics

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Comprehensive Evaluation Index System of Bridge Preventive Maintenance Sun Ma，Liu Qingyang，Xiang Chenglong 2013, 32(增1): 899-902.  DOI: 10.3969/j.issn.1674-0696.2013.sup.1.40 Abstract ( )   PDF (449KB) ( )   Against the bridge preventive maintenance，hierarchy evaluation analysis model，which took the economy，safety and durability as its target，was put forward to determine weight factors and the membership function，and establish a fuzzy comprehensive evaluation system on the bridge preventive maintenance． Economy，security and durability of bridge preventive maintenance，which were unmeasured，were decomposed layer-by-layer into field-testing qualitative or quantitative indicators in this system． Case studies show that the proposed system has the operability and logicality． References | Related Articles | Metrics