地震动特性对加固后单跨框架抗倒塌性能影响分析  

Analysis on influence of ground motion characteristics on anti-collapse performance of reinforced single-span school buildings

作　　者：沈一鹏 孙勇[2] 陈鑫[1] 刘涛[3] 还毅 SHEN Yipeng;SUN Yong;CHEN Xin;LIU Tao;HUAN Yi(Jiangsu Province Key Laboratory of Structure Engineering,Suzhou University of Science and Technology,Suzhou 215011,China;Jiangsu Research Institute of Building Science Co.,Ltd.,Nanjing 210008,China;Jiangsu Provincial Department of Housing and Urban rural Development,Nanjing 210036,China;Engineering Quality Supervision Center of Logistics Support Department of the Central Military Commission,Beijing 100373,China)

机构地区：[1]苏州科技大学江苏省结构工程重点实验室,苏州215011 [2]江苏省建筑科学研究院有限公司,南京210008 [3]江苏省住房和城乡建设厅,南京210036 [4]中央军委后勤保障部工程质量监督中心,北京100373

出　　处：《建筑结构》2025年第1期66-72,138,共8页Building Structure

基　　金：国家自然科学基金(2178294);江苏省六大人才高峰(JZ-005);江苏省高等学校自然科学研究重大项目(19KJA430019);苏州市建设系统科研项目重点项目(2021-2);江苏省研究生实践创新计划项目(SJCX21_1386)。

摘　　要：我国早期中小学校舍一般采用单跨框架外带悬挑走廊的结构形式,此类结构在强震作用下水平位移大且极易倒塌,有必要从提升抗震倒塌性能的角度对既有单跨框架进行加固。设计了混合加固方案,对加固前后结构动力特性进行对比分析。选取了远场、近场无脉冲和近场有脉冲地震动记录,对比分析了该结构在多遇和罕遇地震作用下的抗震性能。评估了不同地震动特性下单跨框架加固前后的倒塌概率。结果表明:远场、近场无脉冲和近场有脉冲地震作用下的结构倒塌概率分别为7.09%、57.19%和74.32%,加固后可分别降至2.81、6.01%和35.70%,近断层区域的单跨框架具有较高的倒塌概率,速度脉冲效应又会放大这一指标。The early primary and secondary school buildings in China generally adopt the structural form of single-span frame with cantilevered corridors.Such structures have large horizontal displacement and are prone to collapse under strong earthquakes.It is necessary to strengthen the existing single-span frame from the perspective of improving the seismic collapse performance.The hybrid reinforcement scheme was designed,and the dynamic characteristics of the structure before and after reinforcement were compared and analyzed.The far-field,near-field non-pulse and near-field pulse ground motion records were selected,and the seismic performance of the structure under frequent and rare earthquakes was compared and analyzed.The collapse probability of single-span frames before and after reinforcement under different ground motion characteristics was evaluated.The results show that the probability of structural collapse under far-field,near-field non-pulse and near-field pulse ground motion is 7.09%,57.19% and 74.32% respectively,which can be reduced to 2.81%,6.01% and 35.70% after reinforcement.The single-span frames in the near-fault area have a high probability of collapse,and the velocity pulse effect will amplify this index.

关 键 词：地震动特性 单跨RC框架 抗震加固 近场地震 易损性分析 抗倒塌性能 

分 类 号：TU375[建筑科学—结构工程]