近断层速度脉冲型地震动对多层校舍减震加固性能影响研究  

Study on the influence of near-fault velocity pulse ground motions on the seismic performances of multi-story school buildings strengthened with dampers

作　　者：陈超 陈鑫[1] 俞伟根[2] 孙勇[2] 刘涛[3] 还毅 Chen Chao;Chen Xin;Yu Wei-gen;Sun Yong;Liu Tao;Huan Fi(Jiangsu Key Laboratory of Structural Engineering,Suzhou University of Science and Technology,Suzhou 215011,China;Jiangsu Academy of Building Research,Nanjing 210008,China;Department of Housing and Urban-rural Development of Jiangsu Province,Nanjing 210008,China;Engineering Quality Supervision Center of Logistics Support Department of Central Military Commission,Beijing 100037,China)

机构地区：[1]苏州科技大学江苏省结构工程重点实验室,江苏苏州215011 [2]江苏省建筑科学研究院有限公司,江苏南京210008 [3]江苏省住房和城乡建设厅,江苏南京210036 [4]中央军委后勤保障部工程质量监督中心,北京100037

出　　处：《工程抗震与加固改造》2021年第3期95-103,共9页Earthquake Resistant Engineering and Retrofitting

基　　金：江苏省自然科学基金(BK20161581,BK20181078);江苏省“333”工程科研项目(BRA2018372);江苏省高等学校自然科学研究重大项目(19KJA430019);江苏省研究生科研与实践创新计划项目。

摘　　要：近断层地震动具有加速度、速度脉冲运动特性,相对于普通地震动对结构可能造成更加不利的影响。本文针对典型多层校舍,对比了其黏滞消能减震加固前后的结构响应,研究了黏滞消能减震加固技术在不同地震动(近断层脉冲型地震动、近断层非脉冲型地震动和远场地震动)下的抗震性能和减震效果。首先,阐述了近断层地震动基本特征,并选择合适的地震动记录。随后,围绕某多层校舍开展了黏滞阻尼减震加固设计。最后,开展了多遇及罕遇地震下结构动力时程分析,对比、评价了结构抗震性能和可恢复性,以及阻尼器工作性能。研究结果表明,黏滞阻尼减震技术有效改善了结构抗震性能,罕遇地震作用下,结构薄弱层层间位移在各地震动工况平均衰减可达62.1%,薄弱层残余层间位移角平均减小71.3%;近断层脉冲型地震使结构产生明显大于同等强度普通地震(远场地震和近断层非脉冲地震)作用下的响应,罕遇地震作用下薄弱层层间位移角达远场地震工况的2.75倍,但黏滞阻尼减震效果受地震动特性变化影响较小。相关研究可为断层附近多层校舍抗震加固设计提供参考。The near fault ground motion has the characteristics of acceleration and velocity pulse motion,which may cause more adverse effects on the structure than ordinary ground motion.In this paper,by comparing the structural response of a multi-storey school building before and after viscous energy dissipation,the damping effect of viscous energy dissipation technology under different ground motions(near fault pulse ground motion,near fault non pulse ground motion and far field vibration)is studied.First of all,the basic characteristics of near fault ground motion are described,and the appropriate records are selected.Then,the viscous damping strengthening design is carried out around a multi-storey school building.Finally,the dynamic time history analysis of the structure under frequent and rare earthquakes is carried out,and the seismic performance and residual deformation of the structure and the working performance of the damper are evaluated according to the results.The results show that the viscous damping technology can effectively improve the seismic performance of the structure.Under the rare earthquake,the average attenuation of the displacement between the weak layers can reach 62.1%,and the residual inter story displacement angle of the weak layer is reduced by 71.3%.The near fault pulse type earthquake makes the structure produce significantly greater than the ordinary earthquake(far-field earthquake and near fault non pulse earthquake).Under the rare earthquake,the displacement angle between the weak layers is 2.75 times of that under the far-field earthquake condition,but the effect of viscous damping on the damping effect is less affected by the change of ground motion characteristics.The relevant research can provide reference for the seismic reinforcement design of multi-storey school buildings near the fault.

关 键 词：钢筋混凝土框架 黏滞流体阻尼器 减震加固 近断层速度脉冲型地震 近场地震 

分 类 号：TU352[建筑科学—结构工程]