钢筋混凝土框架结构与楼梯构件协同抗震性能研究  

The Anti-seismic Performance of Reinforced Concrete Frame Structure Combined with Stairs

作　　者：李碧雄[1] 吴德民 王旋[1] LI Bixiong;WU Demin;WANG Xuan(College of Architecture and Environment,Sichuan University,Chengdu,China,610065)

机构地区：[1]四川大学建筑与环境学院

出　　处：《沈阳建筑大学学报（自然科学版）》2019年第6期970-980,共11页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家重点研发计划项目(2018YFC1508802);国家自然科学基金项目(51678379);四川省学术带头人培养基金(川人社办发[2016]183-2)

摘　　要：目的研究地震中楼梯构件的存在及其布设位置对钢筋混凝土框架结构整体抗震性能、楼梯间周边主体结构构件及楼梯构件自身的受力状态的影响.提出减小楼梯间对框架结构不利影响的设计方法.并对其进行评估.方法通过MIDAS/GEN有限元分析软件进行静力Pushover分析和动力弹塑性时程分析,并与实际震害现象进行了对比.结果楼梯构件能增大结构的抗侧刚度和结构的扭转效应;楼梯间周围主体结构梁柱内力受楼梯构件的影响较大;楼梯构件及与之相连的框架梁柱较早地出现塑性铰;楼梯间布设在结构中部对结构抗震性能影响最大.结论楼梯间对框架结构的刚度分布、框架构件的内力分布有较大的影响,采用滑动支座弱化楼梯间和主体框架结构的连接,能明显减小楼梯构件对框架结构的不利影响.In order to study the impact of the presence of stair components and its placement on the overall seismic performance of the reinforced concrete frame structure,and on the stress state of the surrounding main structural members and the stair components themselves,the design method is proposed to reduce the adverse effect of the staircase on the frame structure and evaluated.Static Pushover analysis and dynamic elastoplastic time history analysis were carried out by MIDAS/GEN finite element analysis software and its results with the actual earthquake damage was compared.It shows that the stair component can increase the lateral stiffness and the torsional effect of the structure,the internal force of the main structure girders and columns around the staircase is greatly affected by the stair components,the stair components and the frame beams and columns connected with them appear plastic hinge earlier comparing with other frame structure components.The arrangement of stairwells in the middle of the structure has the greatest impact on the seismic performance of the structure.The stairwells has a great influence on the stiffness distribution and internal force distribution of the frame structure.The use of slipping-foot,to weaken the connection between the stairwell and the frame structure,can obviously reduce the adverse influence of the stair components on the frame structure.

关 键 词：楼梯间 抗震性能 框架结构 塑性铰 有限元分析 时程分析 

分 类 号：TU375.4[建筑科学—结构工程]