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泸县6.0级地震城市建筑群震害模拟与震害机理分析

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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.
Simulation and Mechanism Analysis of Seismic Damage to Urban Buildings Groups during the Ms 6.0 Luxian Earthquake
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 Ms 6.0 earthquake was established.The effec-tiveness of the model was verified using seismic damage field investigation data from two levels:typi-cal 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 relation-ship 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 ini-tial 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.

urban seismic damage simulationLuxian Earthquakeelastoplastic time-history analysisanalysis of seismic damage mechanismseismic damage investigation

潘毅、张兰林、林旭川、张彪

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西南交通大学土木工程学院,四川 成都 610031

西南交通大学抗震工程技术四川省重点实验室,四川 成都 610031

西南交通大学希望学院,四川 成都 610400

中国地震局工程力学研究所地震工程与工程振动重点实验室,黑龙江 哈尔滨 150080

地震灾害防治应急管理部重点实验室,黑龙江 哈尔滨 150080

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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

国家重点研发计划项目国家自然科学基金成都市重点研发项目

2022YFC3003604522785342024-YF05-00331-SN

2024

10.13409/j.cnki.jdpme.20240808004

防灾减灾工程学报
中国灾害防御协会 江苏省地震局

防灾减灾工程学报

CSTPCD北大核心
影响因子：0.529
ISSN：1672-2132
年,卷(期)：2024.44(5)