摘要
第五代《中国地震参数区划图》(GB18306-2015)中在原有“常遇、设防和罕遇地震动”之外,引入了“极罕遇地震动”。但目前关于“极罕遇地震动”下RC框架结构抗震性能研究较少。本文研究了RC框架结构在四级地震作用下的抗震性能,并对比了结构在非脉冲地震动和脉冲型地震动下结构反应及其不确定性差异。结果表明:依据现有规范设计的RC框架结构在极罕遇地震下:远场非脉冲地震动引起的最大层间位移角均小于规范规定的防倒塌限值2%,但在近场脉冲地震动引起的最大层间位移角达到3.5%,大于规范规定的防倒塌限值2%,脉冲型地震动下结构反应的不确定性大于非脉冲型地震动下反应的不确定性。
The“extremely rare earthquake”is introduced in the latest fifth generation of Seismic ground motion parameter zonation map of China(GB18306-2015)besides“frequent earthquake”,“design earthquake”and“rare earthquake”.However,there are few research about the performance for RC frames under extremely rare earthquake.The seismic performance of two RC frames under the four seismic intensities are studied in this paper.The structural responses and uncertainty are compared when the structures are under the excitation of non pulse-like ground motions pulse-like ground motions.For the RC frames designed according to the current seismic codes under the excitation of extremely rare earthquake,the results show that structural maximum inter-story drift ratio(IDR)caused by far-field ground motions is less than the value of collapse prevention 2%,while the structural maximum IDR caused by near-field pulse-like ground motions reaches 3.5%,which is much larger than the value of collapse prevention 2%.The uncertainties of structural response under the excitation of pulse-like ground motions are larger than those of non pulse-like ground motions.
作者
左占宣
公茂盛
张浩
ZUO Zhanxuan;GONG Maosheng;ZHANG Hao(Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China)
出处
《地震工程与工程振动》
CSCD
北大核心
2021年第4期81-89,共9页
Earthquake Engineering and Engineering Dynamics
基金
中国地震局工程力学研究所基本科研业务费专项(2019C11,2019A01)
黑龙江省自然基金项目(LH2019E097)
国家重点研发计划课题(2017YFC1500601)。
关键词
极罕遇地震动
近场脉冲型地震动
不确定性
RC框架结构
抗震设防烈度
extremely rare earthquake
near-field pulse-like ground motions
uncertainty
RC frame structure
seismic fortification intensity
