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30 June 2013, Volume 32 Issue 增1 Previous Issue    Next Issue

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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 ( )