一致风险谱作用下RC框架结构响应预测及其设计值确定  

Response prediction and its determination of design value for RC frame structures under uniform risk spectra

作　　者：王丛 吕大刚[1,2,3] WANG Cong;LU Dagang(Key Lab of Structure Dynamic Behavior and Control of China Ministry of Education,Harbin Institute of Technology,Harbin 150090,China;Key Lab of Smart Prevention and Mitigation of Civil Engineering Disaster of the Ministry of Industry and Information Technology,Harbin Institute of Technology,Harbin 150090,China;Key Laboratory of Earthquake Disaster Mitigation of Ministry of Emergency Management,Harbin Institute of Technology,Harbin 150090,China)

机构地区：[1]哈尔滨工业大学结构工程灾变与控制教育部重点实验室,黑龙江哈尔滨150090 [2]哈尔滨工业大学土木工程智能防灾减灾工业与信息化部重点实验室,黑龙江哈尔滨150090 [3]哈尔滨工业大学地震灾害防治应急管理部重点实验室,黑龙江哈尔滨150090

出　　处：《建筑结构学报》2023年第4期216-226,共11页Journal of Building Structures

基　　金：国家自然科学基金项目(52078176,51678209);国家建设高水平大学公派研究生项目(CSC NO.202006120344)。

摘　　要：基于一致风险谱的抗震设计,能够综合考虑地震危险性和结构易损性,使不同地区的结构在地震作用下实现同一目标倒塌风险。为了确定用于抗震设计的具有一致倒塌风险的风险导向地震动参数设计值和最大层间位移角设计值,以巨震和大震一致风险谱为目标谱选取地震动记录;采用比较点法对8层3跨RC框架结构的响应(最大层间位移角)进行了预测;基于优选的地震动记录对结构进行增量动力分析(IDA),采用小样本均值乘以修正系数的方法确定最大层间位移角设计值,并对最大层间位移角设计值与其预测值之间的关系进行了研究;在此基础上,基于IDA结果确定了风险导向谱加速度设计值。研究表明,基于巨震和大震一致风险谱对RC框架结构进行抗震设计,中位值IDA曲线上对应的最大层间位移角设计值分别为0.010和0.007,既满足50年倒塌概率1%的目标倒塌风险,也满足CECS 392:2021《建筑结构抗倒塌设计标准》中对RC框架结构在地震作用下不发生倒塌的层间位移角限值1/50的要求。Seismic design based on uniform risk spectra(URS)can consider both seismic hazard and structural fragility,resulting in a uniform collapse risk of the structures in different regions.In order to determine the seismic design values of risk-targeted ground motions and the maximum inter-story drift ratio(MIDR)with uniform collapse risk,the ground motions were selected based on the URS of very rare earthquake and maximum considered earthquake.Then,the point of comparison method was used to predict the response(i.e.,MIDR)of an 8-story 3-bay RC frame structure.Also,the incremental dynamic analysis(IDA)of the structure was conducted using the selected ground motions,and the seismic design value of MIDR was determined using the sample mean of structural response multiplied by the correction coefficient.Finally,the relationship between the seismic design value of the MIDR and its predicted value was studied,and the seismic design value of risk-targeted spectral acceleration was also determined on the basis of the IDA results.The results show that the MIDR of the RC frame structure designed based on the URS of very rare earthquake and maximum considered earthquake in the median IDA curve is 0.010 and 0.007,respectively,which not only meets the target collapse risk of 1%in 50 years,but also meets the requirements of CECS 392:2021‘Standard for anti-collapse design of building structures’on MIDR(i.e.,1/50)of RC frame structures without collapse under earthquakes.

关 键 词：一致风险谱 比较点法 结构响应设计值 最大层间位移角 风险导向谱加速度 

分 类 号：TU375[建筑科学—结构工程] TU312