摘要
结合建筑群震害调查与精细化数值仿真等手段,对城市建筑群的震害机理进行研究。首先,建立了泸县6.0级地震中泸县县城的建筑群震害仿真模型,并采用现场震害调查数据,从典型小区、城市整体两个层面,对模型的有效性进行验证。基于震害仿真模型,选取4条具有不同持时和频谱特性的地震动,比较不同地震动对泸县建筑群的破坏力特征,研究不同地震动破坏力随时间和峰值加速度(PGA)的演化特征。研究结果表明:地震动的频谱特性对不同层数、不同类型建筑具有选择性破坏作用,进而影响城市建筑群损伤程度与分布;不同地震动在不同时刻破坏力差异很大,进而导致建筑群损伤发展速度差异明显,前期破坏力较低的地震动仍可能对在后期对建筑群产生严重破坏;对地震动的PGA进行归一化,当PGA较小时,不同地震动造成的建筑群损伤程度接近,随着PGA的放大,不同地震动作用下建筑群损伤差异不断增大,其损伤指数差异可达数倍。
By combining seismic damage investigations with refined numerical simulations,this study explores the damage mechanisms of urban building groups.First,a seismic damage simulation model for building groups in Luxian County during the M_(s) 6.0 earthquake was established.The effectiveness of the model was verified using seismic damage field investigation data from two levels:typical residential areas and the whole city.Based on the simulation model,four sets of ground motions with different durations and spectral characteristics were selected to compare their destructive effects on the building groups in Luxian.The evolution of the destructive forces over time and their relationship with peak ground acceleration(PGA)were studied for different ground motions.The results showed that the spectral characteristics of ground motion had selective damaging effects on different types and heights of buildings,affecting the degree and distribution of damage within urban building groups.The destructive forces of different ground motions varied greatly at different times,leading to significant differences in the damage development speed of buildings.Ground motions with lower initial destructive force could still cause severe damage to buildings in later stages of the earthquake.When normalizing PGA,it was found that for smaller PGAs,the damage degree caused by different ground motions was similar,but as PGA increased,the damage difference between different ground motions increased continuously,with damage indices differing by several times.
作者
潘毅
张兰林
林旭川
张彪
PAN Yi;ZHANG Lanlin;LIN Xuchuan;ZHANG Biao(School of Civil Engineering,Southwest Jiaotong University,ChengDu 610031,China;Key Laboratory of Seismic Engineering of Sichuan Province,Southwest Jiaotong University,Chengdu 610031,China;Southwest Jiaotong University Hope Collage,Chengdu 610400,China;Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;Key Laboratory of Earthquake Disaster Mitigation,Ministry of Emergency Management,Harbin 150080,China)
出处
《防灾减灾工程学报》
CSCD
北大核心
2024年第5期977-986,共10页
Journal of Disaster Prevention and Mitigation Engineering
基金
国家重点研发计划项目(2022YFC3003604)
国家自然科学基金(52278534)
成都市重点研发项目(2024-YF05-00331-SN)资助。
关键词
城市震害模拟
泸县地震
弹塑性时程分析
震害机理分析
震害调查
urban seismic damage simulation
Luxian Earthquake
elastoplastic time-history analysis
analysis of seismic damage mechanism
seismic damage investigation
