热老化条件下公路桥梁板式氯丁橡胶支座抗剪试验  

Shear tests of plain chloroprene rubber bearings of highway bridge under thermal aging condition

作　　者：张延年[1] 单春红[1] 郑怡 沈小俊[3] 高飞[3] 熊卫士 

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168 [2]辽宁省建筑材料监督检验院,辽宁沈阳110032 [3]重庆市公路工程质量检测中心,重庆400060 [4]重庆交通建设(集团)有限责任公司,重庆401147

出　　处：《江苏大学学报（自然科学版）》2013年第4期471-475,共5页Journal of Jiangsu University：Natural Science Edition

基　　金：“十二五”国家科技支撑计划项目(2012BAJ16B05);重庆市科技攻关计划项目(CSTC2011AC6157);辽宁省高等学校杰出青年学者成长计划项目(LJQ2011061);辽宁省教育厅科学技术研究项目(LS2010135)

摘　　要：利用高温试验箱模拟热老化过程,对氯丁橡胶支座进行20,40,60和80 d的热老化处理,进行抗剪试验.通过对比分析,研究热老化对氯丁橡胶支座的抗剪承载力、极限抗剪强度、水平等效刚度以及抗剪弹性模量的影响.结果表明:氯丁橡胶支座在热老化处理后,比标准试件更易发生脆性破坏,且钢板外露、层状破坏、裂缝等剪切破坏现象更为严重.随着热老化程度加深,氯丁橡胶支座抗剪承载力、极限抗剪强度、水平等效刚度和抗剪弹性模量逐渐降低.采用最小二乘法对50年的抗剪强度和抗压弹性模量进行了分析,由其衰减曲线和衰减函数可知,衰减变化趋势基本符合指数函数规律.The thermal aging process was simulated by the high temperature chamber. The plain chloroprene rubber bearings were processed by thermal aging treatment for 20,40,60 or 80 days, and then the shear tests were conducted. Compared with the standard piece, the impacts of thermal aging treatment on shear carrying capacity, ultimate shear strength, horizontal equivalent stiffness and shear elastic modulus were investigated. The test results show that the plain chloroprene rubber bearings are more prone to brit- tle failure under thermal aging treatment than the standard piece, and the shear failure of plate exposure, lamellar damage and cracks are more serious. The shear carrying capacity, ultimate shear strength, horizontal equivalent stiffness and shear elastic modulus of plain chloroprene rubber bearings are decreased with the increase of thermal aging degree. The shear strength and compressive elastic modulus for 50 years were investigated by the least squares method. According to the decay curve and the attenuation function, the trend is consistent with the law of exponential function.

关 键 词：氯丁橡胶支座 热老化 抗剪承载力 极限抗剪强度 水平等效刚度 抗剪弹性模量 

分 类 号：U443[建筑科学—桥梁与隧道工程]