厚层橡胶支座的力学性能试验研究  

Tests for mechanical performance of thick rubber bearings

作　　者：李吉超[1] 尚庆学 罗清宇 王涛[1] LI Jichao;SHANG Qingxue;LUO Qingyu;WANG Tao(Key Lab of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics, CEA, Harbin 150080, China;China Academy of Building Research, Beijing 100013, China)

机构地区：[1]中国地震局工程力学研究所中国地震局地震工程与工程振动重点实验室,哈尔滨150080 [2]中国建筑科学研究院,北京100013

出　　处：《振动与冲击》2019年第9期157-165,共9页Journal of Vibration and Shock

基　　金：国家重点研发计划课题(2016YFC0701101);中国地震局工程力学研究所基本科研业务费(2016A06);中国地震局创新团队发展计划(1630209470201)

摘　　要：普通橡胶支座具有较大的竖向刚度,往往与结构的竖向周期耦合引起不利的共振效应,为了避免竖向地震对隔震建筑内重要仪器设备的损害,提出利用厚层橡胶支座进行隔震的方法,并对厚层橡胶支座的力学性能进行了系统的试验研究。试验表明:与普通橡胶支座相比,厚层橡胶支座具有基本相同的剪切刚度和较小的竖向刚度,可用于核电、桥梁、地铁站等结构的三维隔震。厚层橡胶支座具有良好的大变形性能、疲劳性能、徐变性能和老化性能。针对厚层橡胶支座的轴压敏感性,提出了一种考虑橡胶层压缩模量、面积、厚度变化的积分修正方法,修正值与试验结果吻合较好。Traditional rubber bearings have a larger vertical stiffness to resist building gravity, but this stiffness may be coupled with building’s vertical natural vibration period to cause harmful resonance effect. Here, to avoid damages of vertical earthquakes to important instruments and equipment in isolated buildings, the method of 3-D isolation using thick rubber bearings was proposed. Mechanical performance tests were conducted for thick rubber bearings. The test results showed that compared with traditional rubber bearings, thick rubber bearings have the basically same shear stiffness as that of the former and a smaller vertical stiffness, they can be used in 3-D seismic isolation for nuclear stations, bridges and subway stations;thick rubber bearings have a good large deformation performance, creep one, anti-fatigue capacity and anti-aging one;aiming at thick rubber bearings’ sensitivity to axial compression, an integral correction method is proposed considering variations of rubber layer’s compressive module, area and thickness, the corrected values agree better with the test results.

关 键 词：厚层橡胶支座 竖向隔震 性能检测试验 竖向刚度修正方法 

分 类 号：TU317.1[建筑科学—结构工程]