基于整体式反应位移法的无柱中庭地铁车站抗震研究

Study on Seismic Resistance of Column-free Atrium Style Subway Station Based on the Integral Response Displacement Method

无柱中庭式地铁车站作为一种新型车站结构形式,去除了中柱并在中板设置开孔以扩大有效空间,提高换乘效率。为研究无柱中庭式地铁车站在地震作用下的响应特点,采用适用于复杂断面地下结构的整体式反应位移法进行拟静力抗震分析,对比具有相同断面形状的大跨度无柱中庭式车站、一般有柱车站和无柱车站的内力分布情况。结果表明,相同断面形状情况下,大跨度无柱中庭式车站的轴力、剪力、弯矩在整体上都要大于无柱车站与一般有柱车站的轴力、剪力、弯矩;底板与侧墙连接处是无柱中庭车站的薄弱部位,中板与侧墙连接处相较传统车站也更为不利。

As a new station structure, the column-free atrium style subway station deletes central columns and set up openings in the middle plate to expand the effective space and increase the efficiency of transfer. To understand the response characteristics of the column-free atrium style subway station with the action of an earthquake, the integral response displacement method suitable for the underground structure with a complex face was used for quasistatic seismic analysis, and the distribution of internal force is compared among large-span column-free atrium style subway stations, general column subway stations and column-free subway stations, all of which have the same face shape. The results show that if the face shape is identical, the axial face, shearing force and bending moment of a large-span column-free atrium style subway station are higher than those of a column-free station and a general column station;the weak position of a column-free atrium style subway station is the connection between the bottom plate and the side walls, and the connection between the middle plate and the side walls is more disadvantageous than traditional subway stations.