超低硬度隔震橡胶支座的竖向力学性能研究  

Vertical mechanical property of elastomeric isolators with ultra-low hardness

作　　者：沈朝勇[1] 崔杰[1] 马玉宏[1] 陈洋洋[1] 林佳[1] 王世斌 

机构地区：[1]广州大学工程抗震研究中心,广东广州510405 [2]西北建筑设计研究院有限公司,陕西西安710005

出　　处：《地震工程与工程振动》2012年第5期136-145,共10页Earthquake Engineering and Engineering Dynamics

基　　金：国家重点基础研究发展计划资助项目(973项目)(2011CB013606);国家重点基础研究发展计划资助(973项目)(2012CB723304);国家自然科学基金重大研究计划项目(90815027)

摘　　要：为了解具有超低硬度(G值为0.196 MPa,简称G2)的天然隔震橡胶支座(简称LNR)及铅芯隔震橡胶支座(简称LRB)的竖向力学性能,采用试验方法对不同直径G2-LNR支座和G2-LRB支座进行了不同压力下竖向刚度、不同水平剪应变下竖向静刚度及不同水平连续剪切位移下支座附加竖向变形测试,对同直径G值为0.392MPa(简称G4)支座部分相同性能进行了对比测试,并将G2测试结果和理论分析结果进行了对比。测试结果表明,G2-LNR竖向刚度随竖向压力的增加呈线性增加的趋势,其不同剪应变状态下竖向静刚度随应变增加呈线性减少的趋势。G2-LRB竖向刚度随竖向压力的增加呈非线性增加,而不同剪应变状态下竖向静刚度随应变未呈现明显的变化规律。试验与理论分析结果表明,测试得到的不同剪应变状态下支座竖向静刚度与理论计算得到的支座刚度在大应变时误差较大。支座不同剪应变状态下竖向静刚度难以准确反映支座在连续水平剪应变状态下的真实刚度,采用藤田隆史考虑重叠面积竖向刚度公式可以较好地预计G2支座在不同剪切位移时支座的附加沉降位移。The intention of this paper is to know the vertical mechanical property of LNR and LRB with shear modulus 0.196 MPa（simplified as G2）.Test method is adopted,and different diameters of G2-LNR and G2-LRB are employed.The dependence of vertical sfiffness of LNR and LRB on vertical pressure and shear strain and the vertical added displacement of isolators at different continuous strain stages are measured.Other isolators with the same diameter,in which the value of G is about 0.392 MPa,is used to test comparatively.Test results of isolators with G2 are compared to the theory results.Test results show that vertical stiffness of G2-LNR will increase linearly with pressure increasing and the static vertical stiffness of that decrease linearly with shear strain increasing.It also shows that the vertical stiffness of G2-LRB will increase nonlinearly with the pressure increasing,but there is no clear law to be founded that the vertical stiffness of that changes with shear strain changing.The comparison between the static vertical stiffness of isolator with G2 and the theory calculation values shows that there is a major error in the great shear strain stage especially.During the test,the static vertical stiffness of isolator with G2 can＇t reflect the real one in the different continuous shear displacements.the formula based on Tengtianlongshi′s idea about flap area should be mentioned and the calculation results of vertical added drop from it can meet the test results well.

关 键 词：超低硬度 LNR LRB 竖向刚度 压力 剪应变 附加竖向沉降变形 重叠面积 

分 类 号：TU317.1[建筑科学—结构工程] TU311.3