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| Research on the Seismic Isolation of High Speed Railway Simple Supported Girder Bridge |
| ZOU Shuang, Wenliuhan·Heisha |
| (Earthquake Engineering Research Test Center, Guangzhou University, Guangzhou, Guangdong 510405 China) |
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Abstract Abstract：Research purposes： In recent years, in order to meet the needs of people′s transportation, high-speed railway project is booming. Correspondingly, the seismic problem of high-speed railway has attracted more and more scholars' attention. However, the general seismic isolation devices can not meet the strict requirements of high-speed railway seismic safety. Therefore, a new seismic isolation system is proposed for the simple supported girder bridge of high-speed railway under rare earthquake. The dynamic design parameters of the new seismic isolation system are optimized to make the new seismic isolation system better serve the high-speed railway bridges. Research conclusions：(1) In the feasible region of LRB performance parameters, the optimal solution satisfying the constraint condition of the model is obtained. The optimization design improves the control effect of the new isolation system and reduces the production cost.（2）The new seismic isolation system has good control effects on the seismic responses of high speed railway simple supported girder bridge under strong earthquake. The new seismic isolation system can minimize the bending moment at the bottom of the pier on the basis of reducing the longitudinal displacement at the end of the beam and ensuring that the pier does not yield. (3) In the seismic isolation design of high speed railway simple supported girder bridge, the longitudinal displacement at the end of the beam and the shear force of the pier are the main constraint conditions, which play an important role in the selection of the performance optimum parameters of the new seismic isolation system. (4) Using the SQP algorithm to solve the optimal design model established in this paper, the convergence of the optimal solution is fast and stable. (5) The research results can provide a new way of thinking and means for the design and application of the seismic isolation technology for the simple supported bridges of high-speed railways.
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Received: 07 August 2017
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2017, Vol. 34 
