基于梁-复合弹簧模型的装配式车站地震反应研究

Seismic Response of Prefabricated Station Structures Based on Beam-composite Spring Model

基于装配式车站结构现有研究成果,建立适用于装配式地铁车站结构的梁-复合弹簧简化动力分析模型,通过与三维实体模型分析结果对比,验证该模型的有效性,并应用该模型开展装配式地铁车站结构与同型现浇结构的横向地震反应对比分析。结果表明:水平地震作用下,装配式车站结构和同型现浇结构的变形差异不大;其截面内力波动趋势与现浇结构一致,且均在同一时刻达到峰值;其典型截面的弯矩及弯矩波动幅度均小于现浇结构,其注浆式榫槽接头减小了结构截面弯矩及弯矩波动的幅度,减弱了结构在地震作用下的弯矩响应。该研究可为预制装配式地铁车站结构抗震计算提供技术支持,为预制装配技术应用于地下结构建设提供参考。

Based on existing research results on prefabricated station structures,a simplified dynamic analysis model of a beam-composite spring suitable for a prefabricated subway station structure was established,and the validity of the model was verified by comparing the analysis results with that of a 3D solid model.A comparative analysis of the transverse seismic responses of a prefabricated subway station structure and the same type of cast-in-place structure was performed using the model.The results show that under horizontal earthquake action,little difference existed in deformation between the prefabricated and cast-in-place structures.The fluctuation trend of the internal force in the section of the prefabricated structure was the same as that of the cast-in-place structure,and both reached a peak simultaneously.The bending moment and fluctuation amplitude of a typical section of the prefabricated structure were smaller than those of the same type of cast-in-place structure.The grouted mortise joints reduced the amplitude of the bending moment and the amplitude of the moment fluctuation of the structural section and weakened the bending moment response of the structure under earthquake action.This study provides technical support for the seismic calculation of prefabricated subway station structures and a reference for the application of prefabricated assembly technology in underground structure construction.