基于部分装配式的隔震地铁车站结构性能研究

Seismic Performance of Metro Station Structures Based on Partial Prefabrication

摘要:

针对中柱、中板及纵梁等内部构件是双层地铁车站结构抗震性能的薄弱环节，提出了一种外部现浇和内部装配的震后可更换新型隔震地铁车站结构形式，建立了考虑部件装配与支座隔震的三维精细化有限元模型，分析了新型地下车站结构的抗震性能。研究表明：在输入峰值加速度小于 0.2g 时，外部现浇和内部装配的车站结构层间位移角完全满足规范规定的弹塑性限值；与整体现浇结构相比，新型车站结构的纵梁、中板和中柱处的地震损伤有明显减小，中板与中柱底端接触部位的地震损伤也有所缓解；外部现浇和内部装配的车站结构在顶底板截面及侧墙的弯矩幅值有小幅增加。总体来看，外部现浇和内部装配的新型设计方法能够有效提高地铁地下结构的整体抗震性能水平和震后可快速修复性。

Abstract:

Given that the internal components such as middle columns, middle plates, and longitudinal beams are the weak points in the seismic performance of double-layer metro station structures, a new metro station structure with external cast-in-place and internal prefabricated components, which could be replaced after an earthquake, was proposed. A three-dimensional refined finite element model considering component prefabrication and seismic isolation bearings was established to analyze the seismic performance of the new underground station structure. The results showed that when the input peak acceleration was less than 0.2g, the inter-story drift angle of the station structure with external cast-inplace and internal prefabricated components fully complied with the code-prescribed elastoplastic limits. The seismic damage at the longitudinal beams, middle plates, and middle columns of the new station structure was significantly reduced compared with fully cast-in-place station structures, and the seismic damage at the contact part between the middle plate and the middle column base was alleviated. The bending moment amplitude in the top-bottom plate sections and side walls of the new station structure slightly increased. On the whole, the new design method with external cast-in-place and internal prefabricated components can effectively improve the overall seismic performance of underground metro structures and their rapid post-earthquake repair capabilities.