不同特性地震下加固后典型校舍抗倒塌与可恢复性能对比分析  

Comparative Analysis of Anti-collapse Capacity and Resilience of Reinforced Typical School Building under Earthquakes with Different Characteristics

作　　者：张瑞 陈鑫[1] 孙勇 刘涛 赵宝成[1] ZHANG Rui;CHEN Xin;SUN Yong;LIU Tao;ZHAO Bao-cheng(Jiangsu Key Laboratory of Structural Engineering,Suzhou University of Science and Technology,Suzhou 215011,China;Department of Housing and Urban-rural Development of Jiangsu Province,Nanjing 210036,China;Jiangsu Research Institute of Building Science Co.,Ltd.,Nanjing 210008,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]江苏省住房和城乡建设厅,南京210036 [3]江苏省建筑科学研究院有限公司,南京210008

出　　处：《科学技术与工程》2022年第36期16141-16151,共11页Science Technology and Engineering

基　　金：国家自然科学基金(52178294);江苏省六大人才高峰(JZ-004);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)。

摘　　要：中小学校是人员聚集场所,其校舍既是保障震时师生生命安全的重要载体,也是灾后重要的应急避难场所,地震作用下校舍抗倒塌性能和可恢复性对提升城镇抗震防灾能力有着重要意义。针对典型校舍的双跨钢筋混凝土(reinforced concrete,RC)框架结构,根据结构安全鉴定结果,开展基于外包角钢法和黏贴碳纤维布法的加固设计。随后,建立结构有限元模型,选取具有不同特性的地震动记录,开展加固前后多遇和罕遇地震作用下的结构地震响应分析。最后,基于倒塌概率和残余层间位移角指标,对比了不同特性地震作用下,加固前后双跨RC框架结构的抗倒塌和可恢复性能。结果表明:双跨RC框架结构具有较好的抗震性能,加固后薄弱层层间位移角在多遇和罕遇地震作用下分别降低21.89%和39.40%;近场地震的长周期和速度脉冲等特性对双跨RC框架抗倒塌和可恢复性能有较大影响,近场有脉冲和近场无脉冲地震作用下1.0g(g为重力加速度)时的倒塌概率分别为远场地震作用下的4.45倍和2.92倍,相应的罕遇地震作用下薄弱层残余层间位移角比值分别为3.14和1.16;加固后倒塌概率和薄弱层残余层间位移角分别平均降低25.34%和54.87%。Primary and secondary schools are places where people cluster together.The school buildings are not only the essential carriers to ensure the life safety of teachers and students during the earthquake but also the important places for emergency refuge after the earthquake.Therefore,the anti-collapse capacity and resilience of the school buildings are of great importance in improving the urban earthquake resistance capacity.For the double-span reinforced concrete(RC)frame structure of a typical school building structure.Based on the results of structural safety appraisement,the reinforcement design was carried out based on the wrapping angle steel method and the sticking fiber-reinforced polymer method.Then,the finite element model of the structure was established,the earthquake records with different characteristics were selected,and the seismic responses of the structure with and without reinforcement under frequent and rare earthquakes were analyzed.Finally,the anti-collapse capacity and resilience of double-span RC frame structures with and without reinforcement under earthquakes with different characteristics were compared based on the collapse probability and residual drift.The results show that the double-span RC frame structure has good seismic performance,and the drifts of the weak layer decrease by 21.89%and 39.40%,respectively,under frequent and rare earthquakes.The characteristics of long-period and velocity pulse in the near-field earthquake greatly influence the anti-collapse capacity and resilience of the double-span RC frame.Considering the PGA(peak ground acceleration)equals 1.0g(g is the acceleration of gravity),the collapse probability under near-field earthquake with pulse and near-field earthquake without pulse are 4.45 times and 2.92 times that of the far-field earthquake,respectively.The relative ratio of residual drifts of the weak layer under rare earthquakes is 3.14 and 1.16,respectively.After reinforcement,the collapse probability and weak layer’s residual drift are reduced by 25.34%an

关 键 词：中小学校舍 双跨混凝土(RC)框架 抗震加固 倒塌性能 可恢复性能 

分 类 号：TU352.11[建筑科学—结构工程]