6.4级漾濞地震某RC框架及其非结构部件震害分析  

ANALYSIS ON DAMAGE OF A RC FRAME AND ITS NON-STRUCTURAL COMPONENTS IN THE MS6.4 YANGBI EARTHQUAKE

作　　者：陈子峰 林旭川[1,2] 陆新征 陈辉[1] 杨凝 周中一 CHEN Zi-feng;LIN Xu-chuan;LU Xin-zheng;CHEN Hui;YANG Ning;ZHOU Zhong-yi(Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin,Heilongjiang 150080,China;Key Laboratory of Earthquake Disaster Mitigation,Ministry of Emergency Management,Harbin,Heilongjiang 150080,China;Department of Civil Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]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 [2]地震灾害防治应急管理部重点实验室,黑龙江哈尔滨150080 [3]清华大学土木工程系,北京100084

出　　处：《工程力学》2024年第1期138-148,共11页Engineering Mechanics

基　　金：中国地震局工程力学研究所基本科研业务费专项项目(2017QJGJ01);黑龙江省自然科学基金杰出青年项目(JQ2021E006);国家自然科学基金项目(U2139209)。

摘　　要：2021年云南漾濞6.4级地震造成了较大范围的建筑破坏,在漾濞县城记录到的地震加速峰值(PGA)高达720.2 gal。在强震作用下,大量土木结构的民居发生了破坏,而约束砌体和钢筋混凝土(RC)结构的震害则相对较轻。现场震害调查发现,部分框架结构的震害明显重于同一区域的其他同类型结构,呈现明显、多样的非结构部件破坏特征。因此,该文对某震害较重的框架进行详细调查,分类分析结构及其非结构部件地震破坏细节;依据图纸及现场考察信息建立精细有限元分析模型,对此次地震的地震动破坏力特征以及该框架结构及其非结构部件的地震破坏机理进行了量化分析。分析结果表明:带填充墙框架仿真模型的分析结果与实际震害现象更接近;框架结构局部大空间、框架底部的约束形式和填充墙的布置形式的综合作用导致结构产生局部过大变形与各类非结构部件的严重破坏。在考虑填充墙对框架结构的作用效应后,结构的不规则性大幅增加,导致结构薄弱层的最大层间位移角相较纯框架模型增加127%,并且明显加剧非结构部件的震害。该文对该建筑震害现象的详细调查与仿真分析,可为结构抗震设计与应急救援决策提供参考。The M_(S)6.4 earthquake in Yunnan Yangbi in 2021 caused damage to buildings in a large area,with the PGA recorded at Yangbi downtown as high as 720.2 gal.Many soil and timber structures were severely damaged,while most of confined masonry structures and reinforced concrete(RC)structures were slightly damaged.It was also found in the field investigation that some of the RC frames exhibited significantly more serious damage than the others in the same area,with various non-structural components damaged.Therefore,a RC frame structure is selected to quantitatively study the characteristics of ground motions and seismic damage mechanism of RC frames.The damage details of the structure and its non-structural components are classified and discussed.And the RC frame models with and without infilled walls,are established according to its blueprints and field investigation data.The simulation results,upon RC frame model with infilled walls,matched the real damage reasonably well.It is found that:the local large space,the constraint form and,the special arrangement of the infilled walls lead to the local excessive deformation of the structure and serious damage of non-structural components.The effect of masonry infilled wall amplifies the irregularity of structure significantly,resulting in a 127%increase of the maximum inter-story drift ratio.The seismic damage to both the structure and its non-structural components is aggravated.The field investigation and numerical analysis on the seismic damage of the RC frame can provide a reference for the improvement of structural seismic design method and for the decision making of emergency rescue.

关 键 词：地震 钢筋混凝土框架 非结构部件 数值仿真 现场调查 震害机理 

分 类 号：TU312.3[建筑科学—结构工程] P315.9[天文地球—地震学]