关于地铁车站计算模型的几点思考

Thoughts on Calculation Model of Metro Station

目前地铁结构计算仍采用荷载结构二维计算模型,为合理简化车站二维计算模型,以郑州地区某一标准地下2层单柱地铁车站为例,分别对围护结构、车站平面计算模型法向、切向约束对结构内力计算的影响进行了研究。结果表明:1)围护结构对车站结构顶、底板弯矩值影响较小,对侧墙内侧弯矩值影响较大;2)计算模型中侧墙法向约束对地铁结构各节点的弯矩值影响较小,底板法向约束对除结构底板中支座、跨中及顶板中支座以外其他节点的弯矩值影响较小;3)计算模型中侧墙切向约束对除底板中支座、顶板跨中以外其他节点的弯矩值影响均较大。

At present,two-dimensional calculation model is still used for subway structural calculation.Taking a standard two-story underground single-pillar subway station in Zhengzhou as an example,the influences of enclosure structure,normal constraints and tangential constraint on the station structure are researched to simplify the station model.The results show that:1)Enclosure structure have little effect on bending moment value of the top and bottom of the station structure while more effect on internal one of side walls.2)Normal constraints of side walls have little effect on bending moment value of subway structure.Normal constraints of the base plate have less effect on the other nodes except middle support and span of bottom plate and middle support of roof plate.3)In the calculation model,tangential constraints of side walls have great influence on the bending moment value of other joints except middle support of the bottom plate and span of the roof.