铅芯橡胶支座反复加载试验研究  

Experiment Study of Lead Rubber Bearings under Cyclic Loading

作　　者：曾令子 杨军[2] Zeng Ling-zi;Yang Jur(Wuhan Chenji Engineering Technology Co.Ltd,Wuhan 430120,China;School of Civil Engineering & Mechanics,Huazhong University of Sci & Tech,Hubei Key Laboratory of Control Structure,Huazhong University of Sci & Tech,Wuhan 430074,China)

机构地区：[1]武汉臣基工程科技有限公司,湖北武汉430120 [2]华中科技大学土木工程与力学学院,华中科技大学控制结构湖北省重点实验室,湖北武汉430074

出　　处：《工程抗震与加固改造》2018年第4期98-101,共4页Earthquake Resistant Engineering and Retrofitting

摘　　要：隔震支座在一次地震中往往会产生多次往复剪切变形。支座的往复变形将使支座的力学性能出现一定程度的变化。通过对不同直径的铅芯橡胶支座(LRB)进行反复加载试验,分析了LRB滞回曲线随加载次数的变化特征及影响因素,研究了LRB的屈服力、屈后刚度与加载次数的相关规律。试验结果表明,在反复加载的过程中,屈服力前期的变化幅度明显大于后期,而屈后刚度在反复加载的过程中变化比较平缓。试验结果还表明,支座直径对反复加载相关性的影响不大。综合隔震支座的反复加载试验数据,给出了屈服力、屈后刚度的拟合计算公式。Shear deformation of seismic isolation bearing often happen over many cycles in an earthquake.The mechanical properties of the bearing will vary to certain extent after the repeated deformation.The lead rubber bearings(LRB)with different diameters are experimented by cyclic loading.The variation characteristics of the hysteresis curve are analyzed,and the factors influencing hysteresis curve are investigated.The basic mechanical properties of LRB,i.e.,yield force and post-yield stiffness,related with loading times are studied.The experiment results show the variation of yield force in the early process of cyclic loading is obviously faster than in the later,meanwhile the variation of post-yield stiffness is relatively flat.The experimental results also show that the bearing diameter has little effect on the correlation of repeated loading.Based on the experimental data of LRB,the fitting formulas of the corresponding mechanical properties are proposed.

关 键 词：铅芯橡胶支座 反复加载 屈服力 屈后刚度 拟合计算 

分 类 号：TU317[建筑科学—结构工程]