摘要
地震动谱形特征对结构地震响应分析至关重要,因此应考虑地震动谱形、选取合适的地震动记录以分析结构易损性。选取条件参数不同,但加速度反应谱值与设计谱相同的4条条件均值谱,分别基于条件均值谱和设计谱进行地震动记录的选取与谱匹配,并通过输入得到的12组地震动记录对一个5层算例结构模型进行增量动力分析,进而分析谱匹配方法以及条件均值谱对结构响应结果和地震易损性结果的影响。分析结果表明:输入谱匹配后的8组地震动记录,其工程需求参数分析结果的离散性明显降低且响应结果无明显偏差;以设计谱为目标谱时,谱匹配后得到的易损性曲线范围较为集中,而以条件均值谱为目标谱时,由于条件均值谱参数的不同,谱匹配后得到的易损性曲线范围较为分散。
The spectra shape characteristics of ground motions are crucial for seismic response analysis of structures.Therefore,considering the spectra shape characteristics of ground motions and selecting appropriate ground motion records are necessary for seismic fragility analysis of structures.Four conditional mean spectra(CMS)with different conditional parameters but same acceleration response spectra as the design spectra were selected.Based on the conditional mean spectrum and the design spectrum,ground motion records were selected and spectral matching was carried out.Finally,incremental dynamic analysis(IDA)was conducted on a 5-storey structure model under the aforementioned 12 suites of ground motion records.The influences of the spectral matching method and CMS on the results of the structural response and seismic fragility analysis were analyzed.The analytical results indicate that under the eight sets of spectrum-matched ground motion records,the dispersion of engineering demand parameters decreases significantly and there are no obvious biases on response results.When the design spectrum is taken as the target spectrum,the fragility curves obtained by spectral matching are more concentrated.While the conditional mean spectrum is taken as the target spectrum,the range of fragility curves obtained by spectral matching is more dispersed due to the different parameters of the conditional mean spectrum.
作者
魏世龙
韩建平
WEI Shilong;HAN Jianping(School of Civil Engineering,Lanzhou Petrochemical University of Vocational Technology,Lanzhou 730060,China;Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province,Lanzhou University of Technology,Lanzhou 730050,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2023年第8期131-138,共8页
Journal of Building Structures
基金
国家自然科学基金项目(51578273,51268036)
甘肃省教育科技创新项目(2022A-208)。
关键词
RC框架
易损性分析
条件均值谱
设计谱
增量动力分析
谱匹配
RC frame structure
seismic fragility analysis
conditional mean spectrum
design spectrum
incremental dynamic analysis
spectrum matching
