青海玛多M7.4地震中剪力墙结构抗震性能初步分析

本文选取2021年5月22日青海玛多县发生的M7.4地震的大武地震台实测加速度及课题组用经验格林函数法模拟的野马滩大桥处的加速度,并将二者的绝对加速度反应谱与中国地震动参数区划图(GB18306—2015)给出的“双参调整”设计反应谱进行对比分析,得到地震波观测值和模拟值对当地抗震设防结构的影响程度应视结构形式而定.然后将两条地震波分别输入到某11层剪力墙结构,用PKPM的SATWE模块进行多遇地震、设防地震下的线弹性分析,并用PUSH模块进行罕遇地震下的静力弹塑性分析.该剪力墙结构在两地区不同地震波作用时,均达到了“小震不坏,中震可修,大震不倒”的设防目标,其抗震性能目标达到C级.结论可为房屋建筑的抗震设防及震后应急响应提供很重要的参考.

Preliminary analysis of seismic performance of a shear wall structure in Qinghai Maduo M7.4 earthquake

In this paper,the measured acceleration of Dawu station of the M7.4 earthquake in Maduo County,Qinghai Province on May 22,2021 and the acceleration at Yematan bridge simulated by our research group with the empirical Green's function method are selected.We compared the two seismic waves'absolute acceleration response spectrum with the"double parameter adjustment"design response spectrum given in the Seismic Ground Motion Parameter Zonation Map of China(GB18306—2015).The influence of the observed and simulated seismic wave on the local seismic fortification structure should depend on the structural form.Then,the two seismic waves are input to an eleven-story shear wall structure respectively.The SATWE module of PKPM is used to complete the elastic analysis under frequent earthquakes and fortified earthquakes,and the static elastic-plastic analysis under rare earthquakes is carried out based on the PUSH module.Under the action of different seismic waves in the two areas,the shear wall structure has reached the fortification goal of"no damage under small earthquake,repairable under medium earthquake and not falling under large earthquake".Those structure has a seismic performance target of grade C.The conclusion can provide an essential reference for seismic fortification and post-earthquake emergency response of buildings.