对称地下结构抗震分析的边界强制反应位移法

基于土-地下结构体系拟静力推覆试验的需求，该文探讨一种模型侧边界强制施加水平位移的对称地下结构地震反应简化分析方法，即边界强制反应位移法。该文详细介绍了这一边界强制反应位移法的实施步骤及基本特点，并以1995年日本阪神地震中破坏的Daikai车站为算例，将该文方法、传统的强制反应位移法及动力时程方法计算结果进行了对比分析，结果表明:当模型宽度取值合理时，该文方法计算精度远高于传统的强制反应位移法，结构内力和层间位移误差在15%以内，是一种有效的对称地下结构抗震简化分析方法。同时，该文分析了拟静力模型中侧边界强制位移传递的衰减规律，可为土-地下结构体系拟静力推覆试验提供一定的参考。

A BOUNDARY FORCED RESPONSE DISPLACEMENT METHOD FOR SEISMIC ANALYSIS OF SYMMETRICAL UNDERGROUND STRUCTURES

A boundary forced response displacement method is proposed for the seismic analysis of symmetrical underground structures based on the requirement of quasi-static pushover test of soil-underground structure systems. The implementation procedure and special features of the method are introduced in detail. We took the Daikai subway station which was damaged during the Kobe earthquake in Japan as an example for the analysis, and compared the results of boundary forced response displacement method, the FEM seismic deformation method and the dynamic time-history analysis method. The results show that the accuracy of the new method was much higher than the FEM seismic deformation method when the width of the model was reasonable. The errors of the internal forces and the story drift were less than 15%. The new method is an effective simplified method for seismic response analysis of symmetrical underground structures. The attenuation law of lateral boundary forced displacement was analyzed. It provides references for the quasi-static pushover test of soil-underground structure system.