摘要
为研究近断层地震作用下框排架结构破坏的可能性,以某钢筋混凝土框排架结构为原型建立有限元非线性分析模型,选取16条近断层地震波及8条远场地震波,采用增量动力分析方法绘制易损性曲线。结果表明:对于远场地震,8度多遇地震及基本地震时,结构正常使用、基本使用、修复后使用、生命安全及防止倒塌五个极限状态均未超越,满足“小震不坏,中震可修”的抗震要求;8度罕遇地震时,仅超越正常使用极限状态的概率为2.08%,满足“大震不倒”的抗震要求。而近断层地震时,在8度多遇地震时结构前四个极限状态均被超越,基本地震时结构超过修复后使用的极限状态概率为16.62%,有2.40%的概率达到生命安全的极限状态,罕遇地震时接近倒塌的概率为15\^4%。研究结果可为近断层地区框排架结构地震风险评估提供参考。
To study the failure possibility of frame-bent structures under near-fault earthquake,the nonlinear finite element analysis model was established based on a reinforced concrete frame-bent structure.16 near-fault and 8 far-field seismic waves were selected,and the incremental dynamic analysis method was used to draw the vulnerability curves.The results showed that for far-field ground motions,five limit states of the structure(normal use,basic use,use after repair,life safety,and collapse prevention)are not beyond under 8-degree frequent and basic earthquakes,thus meeting the seismic requirement of"no damage under minor earthquake,repairable under moderate earthquake";the probability of exceeding limit state of normal use under 8-degree rare earthquake is 2.08%,thus meeting the seismic requirement of"no collapse under major earthquake".For near-fault ground motions,the first four limit states are exceeded under 8-degree frequent earthquake;under 8-degree basic earthquake,the probability of exceeding the limit state of use after repair is 16.62%,and the probability of reaching the limit state of life safety is 2.40%;the probability of approaching collapse under 8-degree rare earthquake is 15.4%.The research results can provide reference for seismic risk assessment of frame-bent structures in near-fault area.
作者
张淑云
周杰
黄磊
王刚
马尤苏夫
ZHANG Shuyun;ZHOU Jie;HUANG Lei;WANG Gang;MAYOU Sufu(School of Architecture and Civil Engineering, Xi'an University of Science and Technology, Xi'an 710054, Shaanxi, China;Shanxi Architectural Design and Research Institute Co, Ltd, Xi'an 710018, Shaanxi, China)
出处
《地震工程学报》
CSCD
北大核心
2021年第2期369-374,共6页
China Earthquake Engineering Journal
基金
国家自然科学基金(51708448)。
关键词
近断层地震
RC框排架结构
脉冲效应
增量动力分析
灾害预测
near-fault ground motion
RC frame-bent structure
pulse effect
incremental dynamic analysis
disaster prediction
