萧甬铁路屏蔽工程结构抗震分析

Analysis of Seismic Resistance of Didang Xincheng Shielding Structure in Shaoxing on Xiaoshan-Ningbo Railway

研究目的:对我国第一座铁路屏蔽工程结构进行地震反应分析,建立结构有限元模型并计算动力特征;采用反应谱法分析不同基础约束条件、顶层覆土厚度对地震反应的影响作用,取得的结果直接指导工程设计和施工。研究结论:水平地震作用时,整体结构出现显著的地震效应,对结构设计有较大影响;可采用边孔顶板斜置的方法,减少覆土厚度,提高结构抗震能力。

Research purposes： The analysis of seismic response of the first railway shielding structure in China is made and the finite element model is established for the shielding structure to calculate the dynamic characteristic. By the response spectrum method, the seismic responses under different foundation and thickness of the top soil are analyzed for the purpose of guiding engineering design and construction. Research conclusions：（ 1 ） When horizontal earthquake happens, the integral structure will show notable seismic effect which should be taken into account in structure design. （2） The weight of the soil on the top of sideward opening of structure is the main reason for creating seismic effect, so it is necessary to reduce it by tilting the top plate in the sideward opening to enhance the capacity of seismic resistance.