十字换乘地铁车站结构地震响应分析

换乘地铁车站结构由于其显著的空间效应以及其在地下交通线网中的重要性,其抗震性能值得关注。基于某十字换乘车站结构,建立其三维计算分析模型。其中将其简化为两方向相同长度和结构形式的地下框架结构,采用等价线性化模型Davidenkov模型考虑土体非线性。计算分析了不同地震动类型和幅值作用下换乘车站结构的地震响应规律。同时,将换乘站地震响应与典型的单体车站进行了比较,探讨了其空间效应及抗震性能。基于本文的计算分析结果表明:对于文中计算分析案例而言,由于换乘站端墙的影响,其空间效应比单体车站强,层间相对变形较小,因此其整体抗震性能优于单体车站。另外,由于换乘站平面尺寸相对较大,在一定程度上阻隔了地震波的传播,因而换乘站降低了土体地表响应,而单体车站则放大了土体地表响应。论文研究成果对换乘车站的抗震设计与分析具有一定的参考意义。

Seismic response analysis of cross metro transfer station structure

The seismic response of transfer station structure is worthy of attention due to its significant spatial effects and importance in the underground network. A three-dimensional computational analysis model is established, in which the transfer station structure is simplified into a cross-shaped structure composed of two frame structures with identical length and structural form, and the equivalent linear model Davidenkov model is employed to consider the nonlinear model of soil. The seismic response of the transfer station structure is calculated under different seismic wave amplitudes and types. At the same time, the spatial effect is analyzed by comparing the seismic response of the transfer station structure with that of a typical subway station. Based on the calculated results, it is shown that the overall seismic performance of the transfer station structure is better than that of a single station due to the influence of its end walls, and its spatial effect is stronger and its relative deformation is smaller. The transfer station blocks the transmission of seismic waves to a certain extent because of its relatively large size. Therefore, the existence of the transfer station reduces site soil acceleration significantly, while the single station amplifies the response of soil surface. The research results can provide some references for the seismic design and analysis of transfer station structures.