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15 October 2013, Volume 32 Issue 5 Previous Issue    Next Issue

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Vibration Characteristics of Leaning Arch Bridge Wang Jianqiu，He Fali，Zhu Dongsheng 2013, 32(5): 903-906.  DOI: 10.3969 /j.issn.1674-0696.2013.05.01 Abstract ( )   PDF (290KB) ( )   Taking Liu-Wu Bridge in Lhasa as the research project，the finite element model of the bridge was established by using the software MIDAS /Civil． The dynamic characteristics，seismic response and vice arch inclination change were analyzed， in order to study the performances of the structure． The results show that the low-order mode shapes of the bridge is mainly the transverse bending of the deck，the lateral stiffness of the deck is weaker; when the waves are inputted in one direction and three dimension，the change rules and influence degree are different in the internal forces for each control section of the lord vice arch． The enlargement of vice arch inclination angle significantly improves the lateral stiffness of structure， and decreases the bending moment of arch rib as well as the lateral displacement of the arch top． But it has little impact on the internal forces of the main arch． References | Related Articles | Metrics

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Selection of Overturning Axis in Lateral Stability Calculation of Girder Bridge Zhou Zijie，Ｒuan Xin，Shi Xuefei 2013, 32(5): 907-910.  DOI: 10.3969 /j.issn.1674-0696.2013.05.02 Abstract ( )   PDF (290KB) ( )   According to the method that overturning stability coefficients used to verify the lateral stability of bridge in current engineering practice，the selection of overturning axes in the cases of different bearing arrangements and different curvature radius was discussed． Both theoretical analysis and FEM calculation results indicate that both for straight girder bridge and curved bridge with large radius，lateral overturning around the axis through the outboard bearings at the abutments of both ends should be checked． For curved bridge with relatively small radius，whose bearings arranged outside the axis through the outboard bearings，lateral overturning around the axis through two outboard bearings of adjacent spans in the middle of the bridge should be checked． References | Related Articles | Metrics

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Ｒeasonable Calculation Model of Irregular Box Girder Concrete Bridge Tao Nengqian，Ye Yanxia 2013, 32(5): 911-914.  DOI: 10.3969 /j.issn.1674-0696.2013.05.03 Abstract ( )   PDF (353KB) ( )   Irregular box girder has a complex structure in the city overpass，which has significantly spatial responses and bending and torsion coupling characteristics． Under the interaction of live loads，the transverse stress of bearings will be uneven， even overload and escapes． Combining with a case study of a certain project with irregular box girder，two and threedimensional finite element model methods were used to analyze the behaviors subjected to traffic load． Analysis and load test results were compared and discussed under local and national specifications． Finally，the reasonable calculation model of the concrete bridge with irregular box girder was deeply discussed． References | Related Articles | Metrics

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Influence of Construction Error on Suspender Length of Suspension Bridges Xu Teng，Zhang Yongshui，Zeng Xiong 2013, 32(5): 915-917.  DOI: 10.3969 /j.issn.1674-0696.2013.05.04 Abstract ( )   PDF (278KB) ( )   Unloaded cable linear form was measured after the erection of common strands of suspension bridge． The vector height of unload cable linear form was amended and compared with the theoretical results． So the causes of error were analyzed． In order to study the influence of unload cable linear form on the main cable linear form of the bridge，a simple method was often used in the engineering practice to predict the main cable sag when the bridge was constructed． The error of main cable linear form is thought to be the same with the error of unload cable linear form． According to engineering practice， an alternative method of prediction of the error was proposed． Appropriate measures are taken to adjust the suspender length so as to ensure the linear form of the bridge meet the design requirements when the bridge is completed． References | Related Articles | Metrics

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Maintenance Strategy of Performance-Based Concrete Bridges in Life Cycle Xiang Yiqiang，Wu Qiangqiang 2013, 32(5): 918-925.  DOI: 10.3969 /j.issn.1674-0696.2013.05.05 Abstract ( )   PDF (393KB) ( )   As far as the reinforced concrete and PC bridge was concerned，some existing problems in planning design，construction， operation and maintenance of concrete bridges were analyzed，such as insufficient load bearing capacity caused by uneven settlement of piers in bridges，horizontal displacement，temperature change，overload，the low design load level in original bridge design，shrinkage and creep of concrete and poor durability and performance degradation of concrete structures caused by chloride permeability，steel bar corrosion，carbonization and cover spalling of concrete，long-term deflection and cracking of main girder，the rain leakage and corrosion of concrete． From the aspects of safety，applicability，durability， economy，environmental protection and the sustainability of structure in the life cycle，the maintenance objectives，performance level，and corresponding strategies and methods of performance-based bridge were explored and discussed． References | Related Articles | Metrics

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3D Numerical Simulation of Cylindrical Flow around Piers by Two-Way Fluid-Structure Coupling Ｒen Hui，Zhou Yitang，Li Ｒui 2013, 32(5): 926-929.  DOI: 10.3969 /j.issn.1674-0696.2013.05.06 Abstract ( )   PDF (564KB) ( )   The producing and development process of the vortex shedding from the circular cylinder were simulated by the software ANSYS CFX，and the calculative example was also given． The Navier-Stokes ( N-S) equation was dispersed by finite volume method，and SIMPLE method was used to solve the discrete N-S equation． The distribution of surrounding pressure coefficient around circular cylinder surface，the drag coefficient，the lift coefficient and Strouhal number of the circular cylinder were calculated and analyzed． The influence of two-dimensional fluid-structure coupling on the flow characteristics around a circular cylinder was obtained． The results of calculation show that because the cylinder is influenced by the water flow，the cylindrical lift and wake flow characteristics show the periodic change，and single frequency vibration also occurs． References | Related Articles | Metrics

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Stability of Small Space Gradient Overlapping Tunnel under Shield Dynamic Load Li Dong，Zhang Fengwu，Zhou Shengcai，Zhou Dongping，Guo Chenye，Xia Binwei 2013, 32(5): 930-933.  DOI: 10.3969 /j.issn.1674-0696.2013.05.07 Abstract ( )   PDF (551KB) ( )   Based on Huahuiyuan—Dalongshan small space gradient overlapping metro tunnels of Chongqing Transit Line 6， the deformation，additional inner force and bending moments were studied under shield dynamic load by numerical simulation and monitoring，and laws of the existing tunnel stability effected by the shield machine passed through were revealed． The results indicate that the maximum deformation occurs about 2 to 3m behind the support boots of shield machine，and uneven settlement mainly occurs in the range between 1． 5D ( D is the diameter of the tunnel) in front of the support boots and 2． 5D behind; shield passing will cause significant additional internal force behind the support boots and little influence forward． According to this，the countermeasures have been taken into account，mainly including weakening longitudinal effect and enhancing its own resistance，which are fully utilized in the post-construction of Chongqing Transit Line 6，and a good effect has been achieved． References | Related Articles | Metrics

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Analysis of Influence Characteristics of Multi-Arch Tunnel under Adjacent Deep Foundation Pit Construction Hu Wenliang，Chen Yinchun 2013, 32(5): 934-937.  DOI: 10.3969 /j.issn.1674-0696.2013.05.08 Abstract ( )   PDF (634KB) ( )   Based on the deep foundation pit construction on adjacent multi-arch tunnel of Jianggai Ｒoad，the finite element software named MIDAS /GTS was used to establish three-dimensional model to calculate and analyze the influence characteristics of multi-arch tunnel under adjacent deep foundation construction． Through the finite element simulation of deep excavation construction process，the multi-arch tunnel structure’s displacement，stress and strain could be got to analyze the influence characteristics under deep foundation pit construction． The analysis results could be helpful for similar projects in the future constructions． References | Related Articles | Metrics

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Mechanic Behavior of Ｒesonant Ｒubblization on Concrete Slab Liu Jinfu 2013, 32(5): 938-942.  DOI: 10.3969 /j.issn.1674-0696.2013.05.09 Abstract ( )   PDF (411KB) ( )   The dynamic model，natural frequencies，the pressure of resonant broken hammer and its transmission ways and laws of the cement concrete slab was discussed and analyzed by the finite element numerical method，which was based on the Winkler foundation model． The results show that the different hammering speeds generate different contact pressure， which cause different crushed effect． The most reasonable hammered contact force adopted in resonant rubblization project should be in range of 20 to 35 MPa． According to the fact that the most reasonable hammer contact impact force given in the practical construction with the fail model of cement concrete slab is the form of “upper rubblized and lower tensile cracked ”， the depth rubblized is in the range of 10 cm． References | Related Articles | Metrics

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Theoretical Analysis on Influence of Overlay on Crack Ｒesistance of Old Cement Pavement Gao Yuanyuan，Zhong Yang，Li Ｒui 2013, 32(5): 943-949.  DOI: 10.3969 /j.issn.1674-0696.2013.05.10 Abstract ( )   PDF (493KB) ( )   The effect of overlay on the crack resistance of cement concrete pavement with cracks was analyzed． In order to simplify this problem，a theoretic analysis model was established by the application of fracture mechanics． Taking the cement concrete pavement as an elastic plate on Winkler foundation，Fourier transform and dislocation density function were used，to deduce the singular integral equation． Lobatto － Chebyshev integration formula，as a numerical method，has been used to solve the singular integral equations． The numerical solution and the expression of stress intensity factor at the crack top were obtained． A case study was carried out，and the stress intensity factors at the crack top with and without the overlay were compared． The results show that the thickness and elasticity modulus of overlay are important factors for the effect of overlay when the overlay reduces the stress intensity factor at the crack top． References | Related Articles | Metrics

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Influence of Asphalt Species on Fatigue Performance of Gussasphalt Concrete Hao Zengheng 2013, 32(5): 950-952.  DOI: 10.3969 /j.issn.1674-0696.2013.05.11 Abstract ( )   PDF (376KB) ( )   The influence of 3 kinds of asphalt species on the fatigue performance of gussasphalt concrete was studied by means of four-point fatigue bending test under strain-controlled mode． The results show that different asphalt species influence the fatigue performance of gussasphalt concrete significantly; the fatigue performance of gussasphalt concrete is excellent when SK70 and lake asphalt compound modified asphalt and ZX-30 modified asphalt are chosen． Different asphalt species significantly influence the visco-elasticity of gussasphalt concrete as well; the bigger lag angles of gussasphalt concrete are，the better fatigue life is． References | Related Articles | Metrics

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Influence of ＲAP Segregation on Performance of Ｒecycled Asphalt Mixture Yu Zhilong，Huang Gang，He Zhaoyi，Wang Guowei，Chen Xianyong 2013, 32(5): 953-957.  DOI: 10.3969 /j.issn.1674-0696.2013.05.12