桥梁支座橡胶材料的静态黏弹性本构模型  

A Static Viscoelastic Constitutive Model of Rubber Material for Bridge Bearing

作　　者：彭龙帆 PENG Longfan(China Construction Second Engineering Bureau Led.,East China Company,Shanghai 200135,China)

机构地区：[1]中国建筑第二工程局有限公司华东公司,上海200135

出　　处：《交通科技》2022年第2期52-55,共4页Transportation Science & Technology

摘　　要：文中利用应力加速原理,对短期拉伸蠕变数据进行平移,得到较长时间下的蠕变曲线,用广义开尔文模型对蠕变曲线进行拟合,得到相关的黏弹性本构模型。考虑到在实际应用中橡胶材料多为受压,故对圆柱体试样进行压缩蠕变和压缩松弛试验,从蠕变试验和松弛试验曲线互为逆像,这表明蠕变和松弛表现出相似的力学特性。利用拉伸试验建立的黏弹性本构模型对圆柱体的蠕变和松弛进行有限元计算,计算值与试验值非常接近,反映该本构模型可用于压缩蠕变和松弛的计算,可以为长时间作用下蠕变位移和应力松弛提供有限元解,节约试验的时间成本。The stress acceleration principle is used to translate the short-term tensile creep data and get the creep curve under a longer time. The generalized Kelvin model is used to fit the creep curve and get the relevant viscoelastic constitutive model. Considering that the rubber is subjected to pressure in practical application, the compression creep test and compression relaxation test are carried out on the cylinder specimens. The curves of the creep test and relaxation test are inverse images of each other, which indicates that the creep and relaxation test show similar mechanical properties. Tensile test is used to establish the viscoelasticity constitutive model for the cylinder of the creep and relaxation of finite element calculation. The calculated value and experimental value is very close, which reflects that the constitutive model can be used for the calculation of compression creep and relaxation, provide the finite element solution for the creep displacement and stress relaxation under long time action, and save the cost of test time.

关 键 词：橡胶 拉伸蠕变 压缩蠕变 应力松弛 

分 类 号：U443.361[建筑科学—桥梁与隧道工程]