研究成果

An improved equivalent energy-based design procedure for seismic isolation system of simply supported bridge in China’s high-speed railway

发布时间:2021/2/2阅读次数:345次

Authors: Wei Guo , Qiandan Du , Zhe Huang , Hongye Gou , Xu Xie , Yong Li

Abstract:The high-speed railway (HSR) in China has developed rapidly in recent years. However, HSR bridges have to face the challenge of earthquakes since China is one of the most earthquake-prone countries in the world. Bearing is the key component  in  the HSR bridge, and using  isolation bearing  instead of common bearing (non  isolation bearing) can provide bridge the better seismic performance. To improve seismic performance of HSR bridges at different  earthquake  intensities,  in  this paper  the  friction pendulum bearing  (FPB)  is used, and an  improved equivalent energy-based design procedure  (EEDP) based on  the principle of energy conservation  is proposed.This method has the advantages of simple calculation and avoiding complicated iterations, which can also take into account  the post-yield stiffness of  the structural members and  is capable of designing  three performance objectives simultaneously. Meanwhile, based on the analysis of experimental data, the improved performance objectives applicable to the isolated HSR bridges are proposed. The FPB of an isolated HSR bridge is designed by the improved EEDP  to verify  the applicability of  the proposed method. Then  the finite element model of  the designed isolated HSR bridge is built, and nonlinear dynamic responses at different earthquake intensities are analyzed to examine the structural seismic performance. Results show that the designed structure can achieve the prescribed  performance  objectives  at  three  earthquake  intensities which  proves  the  practicability  and  effec-tiveness of the proposed improved EEDP method. 

Keywords: High-speed railway bridge;Earthquake;Friction pendulum bearing (FPB);Isolation;Energy-based design procedure (EEDP);Seismic performance


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