预制+现浇装配式地铁地下车站结构地震反应的三维有限元分析

目前对装配式结构的抗震性能研究较少，尤其对装配式地下结构的抗震性能研究尤为缺乏。鉴于此，本文以实际新型预制装配+现浇钢筋混凝土箱型框架式地铁地下车站结构为研究对象，通过建立土-地连墙-装配式地下车站结构的二维和三维两种非线性整体有限元模型，分析了该类新型车站结构的整体抗震性能。结果表明:采用带肋梁预制装配板与现浇钢筋混凝土板的叠合楼板和钢管混凝土中柱的施工工艺能够明显增强结构抗震性能；同时发现二维有限元模型的计算结果高估了车站结构中柱顶底端的地震损伤程度，而低估了车站结构纵梁与中柱连接部位的地震损伤程度。在强地震作用下，建议采用土与地下结构非线性动力相互作用的三维有限元分析模型来真实反应车站结构中柱和纵梁的抗震性能。

3-D numerical modelling on the seismic responses of an underground subway station with some sectional prefabricated members

At present, there is few studies on the seismic responses of the prefabricated structures. Above all, study on the seismic response of the prefabricated underground structures should be more absent. Accordingly, a new large underground subway station with some sectional prefabricated members was selected as a research object. Then, the 2-D and 3-D finite element model were made respectively to investigate the seismic responses of the sectional prefabricated underground structure. As results, the sawtooth contact between the prefabricated plate and the cast-in-place plate should be benefit to the seismic performance of the sectional prefabricated underground structure, and the concrete filled steel tubular column should alsobe benefit to the seismic performance of middle columns. At the same time, 2-D finite element model should overestimate the earthquake damage of middle columns but underestimate the earthquake damage of longitudinal beam. As an important suggestion, the 3-D finite element model should be referred to simulate the seismic responses of a large underground structure under a strong earthquake.