地震与人群步行荷载作用下教学楼框架动力响应分析

Dynamic response analysis of RC frame school building under earthquake action and pedestrian load

教学楼按国家标准属于抗震重点设防类别建筑,结构安全性能十分重要。本文以某钢筋混凝土框架教学楼为研究对象,通过实测得到其在不同工况人行荷载下的动力特性,采用SAP2000有限元分析软件,建立其考虑填充墙和楼梯的三维有限元模型。通过与实测得到的动力特性比较,验证所建立的有限元模型的正确性,并以该有限元模型为基础完成了静止人群荷载与地震共同作用、步行人群荷载与地震共同作用两种工况下该钢筋混凝土框架教学楼的动力响应分析。结果表明:结构在人群步行荷载工况下的最大层间位移角较静止人群荷载工况更大,人群荷载不可当作静止荷载考虑;当同时考虑人行走向水平荷载作用时,结构的最大层间位移角会增大,人行走向水平荷载作用的影响不可忽略。

The school building belongs to the important seismic fortified building,and the structural safety performance is very important.In this paper,A reinforced concrete(RC)frame school building is taken as the research object,the dynamic characteristics of the RC frame are measured,and the finite element(FE)model of the RC frame with infilled walls and stairs are established using the software SAP2000,and the FE model of the RC frame is corrected and verified with the measured dynamic characteristics.Based on the validated FE model of the RC frame,the dynamic response analysis of the RC frame teaching building under load case one(static human load and earthquake action)and load case two(pedestrian load and earthquake action)are finished.The computation results show that:the maximum drift angles of the RC frame under load case two are larger than that of the RC frame under load case one and it’s shown that the moving crowd can’t be considered as statichuman load.If the horizontal load of pedestrian on the way forward is also taken into account at the same time,the maximum drift angles of the RC frame will be increased,the effect of the horizontal load of pedestrian on seismic responses of the RC frame cannot be ignored.