考虑抗震组合的反应位移法计算模型研究

A Study of the Calculation Model for the Response Displacement Method Based on the Seismic Combination

地铁车站结构在地震中的受力多处于非线性阶段,在抗震设计中采用荷载效应组合的方式是不合理的。结合反应位移法的研究现状,采用先进行荷载组合、再进行结构地震反应计算的方法,对目前规范中的反应位移法模型进行改进,并将改进后的计算模型与规范中两种反应位移法,以及时程分析法进行了对比分析。对比结果表明:以时程分析法作为基准,改进后的反应位移法计算模型的结果较为精确,稳定性较高,而且计算过程简单直接,是具有一定实用价值的计算方法。

As the internal force of subway station structures in earthquakes is mostly nonlinear, the traditional design method with load combination is not reasonable. Upon the basis of considering the present state of the study of the response displacement method, improved in the present paper is the existing response displacement model, in which case various loads are combined first, and then the seismic response of the structure is calculated. After that, the improved calculation model is analyzed and compared with the two response displacement methods presented in the technical norm and with the time history analysis method. The compared results show that the results from the improved response displacement model are found to be more accurate and stable if the time history analysis method is used as the standard. Besides, the calculation process with the improved model is even simpler and more direct, and is of certain practical value.