单柱车站公共区抗震设计分析

Analysis of Seismic Design of Public Area in Single-column Station

为了研究单柱车站公共区中板大面积开孔后的抗震性能,选取8度区典型的单柱车站,在静力工况计算分析的基础之上,运用反应位移法和时程分析法对车站进行抗震工况计算分析。分析结果表明:静力工况下的中板纵梁未断开处剖面弯矩计算结果与垂直电梯-楼梯开孔处剖面相比差别不大,仅在中板开孔处有所区别,反应位移法的计算结果与之类似;不论横向地震的作用方向是向左还是向右,顶板边支座最大弯矩均位于跨度较大的边支座处;相较于未开孔处,开孔后负一层和负二层的层间位移角增大;车站结构大部分区域配筋受正常使用极限状态控制,小部分区域受抗震工况控制;在中板开孔以及中板纵梁断开处,增大横梁刚度可减小层间位移角,增加结构的安全储备。

In order to study the seismic performance of the large-area perforated medium plate in public area of singlecolumn stations,a typical single-column station in the 8 degree seismic fortication intensity region is taken as an example in this paper.Based on the calculation and analysis of static working conditions,the seismic calculation and analysis of the station are carried out by the seismic displacement method and time history analysis method.The analysis show that the bending moment calculation results of the section at the unbroken section of the longitudinal beam in medium plate is not much different from that at the opening of the vertical lift-stair under static conditions.The difference is only found at the opening of the medium plate.The calculation result by the reaction displacement method is the similar;No matter the direction of lateral seismic action is left or right in a single-column station,the maximum bending moment of the side-bearings at the top plate is located in side-bearings of the longer span;Compared with the unopened area,the interlayer displacement angle increases in underground 1st and 2nd floor;The reinforcement of most parts of the station structure are controlled by the normal service limit state and some areas are controlled by the seismic condition;At the opening of the middle plate and the opening of the longitudinal beam,that increasing the stiffness of the transverse beam can reduce the interlayer displacement angle and increase the safety reserve of the structure.