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Reaction spectrum comparative analysis of seismic performance of 62m concrete-filled steel tube beam bridge with curved string truss before and after reinforcement
CHEN Daihai *,XU Zhenqi,LI Zheng,MA Laijing,MA Fengrui
School of Civil Engineering, Zhengzhou University, Zhengzhou, 450001
*Correspondence author
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Funding: National Natural Science Foundation of China (No.51408557), Post-doctoral Science Foundation of China(No.2013M541995)
Opened online:26 August 2019
Accepted by: none
Citation: CHEN Daihai,XU Zhenqi,LI Zheng.Reaction spectrum comparative analysis of seismic performance of 62m concrete-filled steel tube beam bridge with curved string truss before and after reinforcement[OL]. [26 August 2019] http://en.paper.edu.cn/en_releasepaper/content/4749442
 
 
Taking a 62m concrete-filled steel tube bridge with curved string truss as the research object, according to its reinforcement scheme, the spatial finite element models of the bridge before and after reinforcement were established by using the general finite element software ANSYS. The natural frequencies of the bridge before and after reinforcement were calculated, and the seismic performance of the bridge was analyzed by using the response spectrum method. The results show that the frequencies of the reinforced bridges increase in varying degrees, especially the vertical and torsional frequencies. Before and after reinforcement, the maximum axial force in the upper chord of the bridge is the largest, and the shear force and bending moment are small. The maximum internal force basically appears at the two ends of the upper chord. This position should be regarded as the weak link of the bridge seismic resistance. Under the same cases, the axial force of the bridge after reinforcement is reduced by about 30% compared with that before reinforcement, and the displacement of the bridge after reinforcement is reduced in varying degrees. The reinforcement measures can improve the lateral and vertical stiffness of the bridge, especially the stiffness of the deck system.
Keywords:bridge engineering; concrete-filled steel tube girder bridge with curved string truss; bridge reinforcement; natural vibration characteristics;seismic response; response spectrum analysis
 
 
 

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