不同边界条件下叠层橡胶支座的水平刚度分析  

Analysis of horizontal stiffness of laminated rubber bearings for different boundary conditions

作　　者：吴忠铁[1] 杜永峰[1] 朱前坤[1] 

机构地区：[1]兰州理工大学防震减灾研究所,甘肃兰州730050

出　　处：《建筑结构学报》2014年第4期208-214,共7页Journal of Building Structures

基　　金：国家自然科学基金项目(50978130;51178211)

摘　　要：为了研究边界条件对叠层橡胶支座水平刚度的影响,定义了四类边界条件,采用弯剪模型,用直接积分法推导了在压剪作用下叠层橡胶支座的水平刚度方程。通过算例分析支座顶面与底面的转动约束参数k0和kh以及竖向荷载p对叠层橡胶支座水平刚度的影响,对比了不同边界条件下水平刚度的变化。结果表明:边界条件对于叠层橡胶支座的水平刚度影响明显,在相同参数k0和kh以及竖向荷载p作用下,边界条件一(k0≈∞和kh≈∞)时水平刚度KR,I最大,边界条件四(k0和kh较小)时水平刚度KR,IV最小,当边界条件相同时随着参数k0和kh的增大,边界条件二、三、四下叠层橡胶支座的水平刚度增大且向边界条件一接近,随着竖向荷载p的增大各类水平刚度降低。In order to analyze the influence of boundary conditions on horizontal stiffness of the laminated rubber bearings, the equations of horizontal stiffness of the laminated rubber bearings under the vertical load and share force were derived by the direct integration method using the shear-bending model. Four boundary conditions were proposed. The influence of the rotational constraint parameters k0 and kh and vertical loadp on horizontal stiffness of the laminated rubber bearings were mainly analyzed using a case. The values of equation derived for different boundary conditions were compared. The results show that the boundary conditions have great influence on horizontal stiffness of the laminated rubber bearings, and when the rotational constraint parameters k0 and kh and vertical loadp are the same, the horizontal stiffness is largest for the first boundary condition （ko ≈ w and kh ≈ ∞ ） , and is smallest for the forth boundary condition; when the boundary condition is the same, other horizontal stiffness increase with the increasing of the rotational constraint parameters k0 and kh and are approximate to the first boundary condition. All decrease with the increasing of the vertical load p.

关 键 词：叠层橡胶支座 边界条件 弯-剪模型 直接积分法 转动约束 水平刚度 

分 类 号：TU352.1[建筑科学—结构工程]