摘要
校舍是保障师生生命财产的重要载体,其抗震安全是城市抗震防灾的重要环节之一,本文围绕不同特性地震动对不规则校舍加固前后抗震性能的影响开展研究。首先,阐述了近场地震动的基本特征,据此选择具备不同特性的地震动记录。随后,根据某小学教学楼检测结果,提出了综合采用增大截面法、外包钢加固法和粘贴碳纤维法的加固方案,并建立了三维有限元模型,对比了加固前后结构动力特性。最后,进行了多遇和罕遇地震作用下结构动力时程分析,从结构和构件层次对比分析了不同特性地震动对加固前、后某校舍抗震性能和可恢复性的影响。结果表明:加固后,罕遇地震作用下,结构层间位移角和残余层间位移角的最大衰减率分别可达78.25%和86.67%,关键薄弱构件的侧向变形平均减少了71.24%,加固方案能显著提升结构的抗震性能和震后恢复能力;近场脉冲型地震下结构响应大于其他类型地震作用,罕遇地震作用时,近场脉冲型地震下薄弱层残余层间位移角平均为远场地震的2.76倍和近场无脉冲型地震的2.79倍,速度脉冲对结构抗震性能影响较大。研究成果可为既有不规则校舍抗震加固设计与性能评价提供参考。
School building is an important carrier to protect the lives and property of teachers and students,so its seismic safety is one of the essential links of urban earthquake disaster resistance and prevention.This paper focuses on the influences of ground motion characteristics on the seismic performance of irregular school buildings before and after reinforcement.Firstly,the basic characteristics of near-field ground motions are presented,and the records with different characteristics are selected.Then,according to the safety inspection results of an elementary school’s teaching building,a comprehensive reinforcement scheme is proposed by using the method of enlarging section,sticking steel plates,and sticking CFRP.Two three-dimension finite element models are established to compare the structure’s dynamic characteristics before and after reinforcement.Finally,the dynamic time history analyses of the structure under frequent earthquakes and rare earthquakes are carried out.The effects of different ground motion characteristics on the seismic performance and recoverability of a school building before and after reinforcement are compared from both member-level and structure-level.The results show that after strengthening,the maximum attenuation rates of the story drift and residual story drift under rare earthquakes can reach 78.25%and 86.67%,respectively,and the lateral deformations of the weak members are reduced by 71.24%on average.Therefore,the strengthening scheme can significantly improve the structure’s seismic performance and resilience.The responses of the structure under the near-field pulse-like earthquake are greater than those under other types of earthquakes.Subjected the rare earthquake,the structure’s average residual story drift of the soft story under the near-field pulse-like earthquakes is 2.76 times that under the far-field earthquake and 2.79 times that under the near-field non-impulse earthquake.The velocity pulse has a significant impact on the seismic performance of the structure.The research results can reference seismic strengthening design and performance evaluation of existing irregular school buildings.
作者
王珮瑜
陈鑫
刘涛
孙勇
还毅
Wang Pei-yu;Chen Xin;Liu Tao;Sun Yong;Huan Yi(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 Academy of Building Research,Nanjing 210008,China;Engineering Quality Supervision Center of Logistics Support Department of Central Military Commission,Beijing 100037,China)
出处
《工程抗震与加固改造》
北大核心
2022年第4期119-128,共10页
Earthquake Resistant Engineering and Retrofitting
基金
江苏省自然科学基金(BK20181078)
江苏省“333”工程科研项目(BRA2018372)
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)。
关键词
校舍建筑
抗震加固
抗震性能
近场地震
速度脉冲
school building
seismic strengthening
seismic performance
near-field earthquake
velocity pulse