【摘要】 汶川地震中许多框架结构楼梯遭到严重破坏,造成大量的人员伤亡。震害调查表明,楼梯作为斜撑构件对整体抗震影响显著。结合新修订的GB 50011—2010《建筑结构抗震设计规范》中关于计算中应考虑楼梯构件的影响等条文,采用D值法建立了考虑楼梯的简化计算模型,对框架刚度及楼梯受力进行修正。通过对比解析法与PKPM(08版)软件计算所得结果,发现地震作用下加入楼梯对整体结构的刚度影响不可忽略,楼梯各构件在地震作用下受力不同于仅仅按照重力荷载作用下分析结果。建议框架结构楼梯梯段、休息平台及梯柱设计时宜考虑地震作用,刚度计算时应考虑楼梯对整体刚度的影响。更多还原

【Abstract】 Many stairs of frame structure in wenchuan earthquake destroyed seriously,resulting in mass casualties.Research on earthquake damage found that diagonal bracing could not be ignored.The newly revised GB 50011—2010 Code for Seismic Design of Building pointed that the impact of stairs should be considered in calculating,so D-method was used for calculating simplified model with stairs in order to amend lateral stiffness of structure and force of stairs.Comparing results of analysis method with PKPM(08),it could be Proved that lateral stiffness considering stairs was greater than the one without taking account of stairs,and typical components of stairs had different force results between earthquake action and the those with considering gravity loads.It was proposed that components of stairs should be designed considering earthquake action;stiffness should be calculated considering effect of stairs.更多还原