浅基岩场地条件下地下结构抗震分析简化方法计算精度研究

为研究浅基岩场地条件下地下结构抗震分析简化方法计算精度，采用反应加速度法和反应谱法计算2层3跨和2层2跨矩形地铁车站结构在均质场地和浅基岩场地条件下的地震响应，将动力时程分析法结果作为参考解，对比分析反应加速度法和反应谱法在不同场地条件下的计算精度。研究结果表明，在均质场地条件下，反应加速度法最大误差约18%，反应谱法最大误差约9%；在浅基岩场地条件下，反应加速度法最大误差约33%，反应谱法最大误差约16%；反应谱法和反应加速度法在浅基岩场地条件下的计算精度均小于均质场地条件，且反应谱法计算精度受场地条件的影响较小。

Study on the Accuracy of Simplified Method for Seismic Analysis of Underground Structures under the Condition of Shallow Bedrock Site

To study the accuracy of simplified method for seismic analysis of underground structures under shallow bedrock conditions, the accuracy of the response acceleration method and the response spectrum method for the seismic analysis of underground structures under the conditions of homogeneous site and shallow bedrock site are compared and analyzed by taking the two storey two span and two storey three span subway station structures as examples. The results show that the maximum error of the method of response acceleration is about 18%, and the maximum error of the method of response spectrum is about 9%; Under the condition of shallow bedrock site, the maximum error of the method of response acceleration is about 33%, and the maximum error of the method of response spectrum is about 16%. The calculation accuracy of the method of response spectrum is higher than that of the response acceleration method, and the calculation accuracy of the method of response spectrum is less affected by the shallow bedrock site. The calculation accuracy of response spectrum method and response acceleration method in shallow bedrock field is lower than that in homogeneous site, and the calculation accuracy of response spectrum method is less affected by site conditions.