高性能板式减震橡胶支座竖向刚度研究  

Research on Vertical Stiffness of High-performance Isolation Rubber Bearings

作　　者：李涵[1] 袁万城[1] 田圣泽 党新志[1] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《中国公路学报》2017年第12期214-220,233,共8页China Journal of Highway and Transport

基　　金："十二五"国家科技支撑计划项目(2015BAK17B04);土木工程防灾国家重点实验室开放基金项目(SLDRCE14-B-14);国家自然科学基金项目(51478339;51278376);江西省科技计划项目(20151BBG70064)

摘　　要：为探究高性能板式减震橡胶支座竖向刚度的影响因素及规律,得到该支座竖向刚度的简化公式,对不同构造的高性能板式减震橡胶支座进行竖向刚度试验,并建立其实体有限元模型,对支座抗压弹性模量受2个形状系数的影响规律进行参数分析。然后,在现有纤维加劲橡胶支座的抗压弹性模量Tsai-Kelly理论公式与Toopchi-Nezhad修正方法的基础上,用得到的抗压弹性模量数值解对Toopchi-Nezhad修正抗压弹性模量公式中的变量系数进行拟合再修正,得到适用于高性能板式减震橡胶支座的抗压弹性模量理论公式。之后,结合新型支座的常用规格,利用支座抗压弹性模量与第一形状系数的线性拟合,得到其简化经验公式,用于高性能板式减震橡胶支座竖向刚度的计算。结果表明:高性能板式减震橡胶支座的抗压弹性模量会受橡胶层厚度、支座平面面积影响,并随支座第一形状系数S_1的增大而增大,随第二形状系数S_2的增大而减小;建立的新型支座有限元模型可以准确模拟其竖向受力性能;拟合得到的高性能板式减震橡胶支座抗压弹性模量理论公式与有限元模拟结果误差仅5%,可用于该支座竖向刚度的理论计算;经简化得到的经验公式可以用于钢丝直径为1mm,15<S_1<45,2<S_2<6的高性能板式减震橡胶支座的工程设计。In order to explore the influencing factors and laws of the vertical stiffness of High-- performance Isolation Rubber Bearings （HIRBs） and obtain the simplified formulas, vertical Stiffness tests were conducted on HIRBs with different configurations. The finite element models of HIRBs were established to investigate the influence of two shape factors on rubber compressive modulus of elasticity. Based on Tsai-Kelly theoretical formula and Toopchi-Nezhad modified method for compressive modulus of Fiber Reinforced Elastomerie Isolators （FREIs）, variation coefficients in the Toopchi-Nezhad compressive modulus of elasticity were modified by the arithmetic solution after the parameter fitting. Hence, the formula for HIRBs was proposed. In Accordance with present HIRB configurations, the theoretical formula was simplified into a linear function between compressive modulus and the first shape factor. The results show that the compressive modulus of elasticity of HIRBs is influenced by rubber layer thickness and area of plane. Compressive modulus of HIRBs increases with the increase of the first shape factor and the decrease of the second shape factor. Finite element model of HIRB is possible to accurately simulate its vertical properties. In addition, the error between theoretical result and the result of the finite element simulation equals to only 5%, the theoretical formula of the compressive modulus of HIRBs can be applied in future research. And the simplified formula can guide the application of HIRBs in practical engineering, when the steel mesh reinforcement is 1 mm thick, 15〈S1〈45 and 2〈S2〈6.

关 键 词：桥梁工程 支座竖向刚度 试验和数值研究 高性能板式减震橡胶支座 竖向刚度理论公式 柔性加劲材料 

分 类 号：U443.361[建筑科学—桥梁与隧道工程]