中庭式地下车站结构设计方案优化

On Optimized Atrium StructureProgram of Underground Station

中庭式地下车站是当前地铁建设的新兴建筑形式,亦是地下结构设计难点问题。采用数值模拟的方法分析地下车站大开孔段主要构件工作机理,提出了开孔段外侧墙加竖直肋梁、侧墙外扩加竖直肋板、开孔段加横撑三种结构优化方案,并利用地下车站有限元模型分析平台对不同结构优化方案进行数值模拟。通过定量分析三种结构优化方案对车站主要构件力学响应,得出了不同方案的优化效果。经过对数值模拟结果比较分析,确定了侧墙外扩加肋板和开孔加撑是较合理的中庭结构优化方案。

Atrium structure of underground station is currently emerging in subway constructions,also a difficult problem in the design of underground structures. In this paper, the main component working mechanism of large open hole sectionat underground station is analyzed by using numerical simulation, three optimizedstrueture programs are proposed： adding vertical rib beam to the lateral wall of open hole section; expanding the side wall outside and adding fibbed plates to the inside of the side wall; adding cross-braces to the open hole section. At the same rime,the analysis platformof underground station finite element model is used to simulate the different structural optimization prograrm. Through quantitative analysis of the mechanical responseof three optimized structure programs to the main components of underground station, the effect of each program is obtained. After a comparative analysis of the numerical simulationresults,expanding the side wall outside, adding ribbed plates to the inside of the side wall and adding cross-braces to the open hole section proveto be more reasonable.