基于试验的串联隔震体系加固方法分析*
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（1 西北民族大学土木工程学院，兰州 730050; 2 兰州工业学院土木工程学院，兰州 730050; 3 兰州理工大学防震减灾研究所，兰州 730050; 4 广州大学工程抗震研究中心，广州 510405）
［摘要］以串联隔震体系的振动台试验为背景，分析了串联隔震体系模型的破坏现象。根据其破坏的特点，用有限元软件MARC对采用外包钢法加固的串联隔震体系进行了分析，研究了5种加固方案下串联隔震体系及钢筋混凝土柱的荷载和位移关系，探讨了加固长度对钢筋混凝土柱破坏时铅芯橡胶支座变形的影响。研究表明：串联隔震体系试验模型的破坏主要表现为钢筋混凝土柱的混凝土开裂和钢筋的屈服。采用外包钢法加固能明显提高串联隔震体系的抗震能力，随着加固长度的增大，抗震能力逐渐提高。当以铅芯橡胶支座的极限变形和钢筋混凝土柱的屈服为设计目标时，串联隔震体系的加固长度存在最优值，本试验模型的合理加固长度比约为0.2。［关键词］串联隔震体系; 振动台试验; 加固长度; 外包钢法; 极限变形中图分类号：TU352.1 文献标识码：A 文章编号：1002-848X(2016)05-0086-05
Analysis of reinforcement method for test-based series seismic isolation systemWu Zhongtie1, Fan Pingping2, Du Yongfeng3, Wang Xiaoqin1, Liu Yanhui4(1 School of Civil Engineering, Northwest University for Nationalities, Lanzhou 730050, China; 2 School of Civil Engineering, Lanzhou Institute of Technology, Lanzhou 730050, China; 3 Institute of Earthquake Protection and Disaster Mitigation, Lanzhou University of Technology, Lanzhou 730050, China; 4 Earthquake Engineering Research & Test Center of Guangzhou University, Guangzhou 510405, China)Abstract:Based on the shaking table test of series seismic isolation system, the damage phenomena of series seismic isolation system model were analyzed. Considering its damage characteristics, finite element software MARC was used to analyze the series seismic isolation system reinforced by wrapped steel outside method. Based on 5 reinforcement schemes, the relationship between force and displacement for series seismic isolation system and reinforcement concrete column was studied, and effect of reinforcement length on deformation of lead rubber bearing was studied when the reinforced concrete columns were damaged. The results show that the damages of series seismic isolation system model mainly feature concrete crack and rebar yield for reinforcement concrete column. Adoption of wrapped steel outside method can obviously improve seismic capacity of series seismic isolation system, and the seismic capacity increases gradually with increase of the reinforcement length. The reinforcement length for series seismic isolation system has the optimal value and the reasonable reinforcement length ratio is about 0.2 for the test model when the design objectives are selected as the ultimate deformation of lead rubber bearing and the yield of reinforcement concrete column.Keywords:series seismic isolation system; shaking table test; reinforcement length; wrapped steel outside method; ultimate deformation
*西北民族大学引进人才科研项目资助（xbmuyjrc201405），西北民族大学中央高校基本科研业务费专项资金项目资助（31920150019），广东省教育厅特色创新项目“广州大学强校工程”（2014KTSCX094）。作者简介：吴忠铁，博士，副教授，Email:wuzhongtie1982@163.com。
