不均匀老化对近海桥梁隔震橡胶支座性能影响及简易预测方法  

Influence of uneven aging on mechanical property of natural rubber bearing for offshore bridge and simplified aging prediction method

作　　者：马玉宏[1] 赵桂峰[2] 罗佳润[1] 崔杰[1,2] 周福霖[1] MA Yuhong ZHAO Guifeng LUO Jiarun CUI Jie ZHOU Fulin(Earthquake Engineering Research ＆ Test Center, Guangzhou University, Guangzhou 510405, China School of Civil Engineering, Guangzhou University, Guangzhou 510006, China)

机构地区：[1]广州大学工程抗震研究中心,广东广州510405 [2]广州大学土木工程学院,广东广州510006

出　　处：《中南大学学报（自然科学版）》2016年第10期3498-3506,共9页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51578170;51678173);国家自然科学基金高铁联合基金重点资助项目(U1334209);国家重点基础研究发展规划(973计划)项目(2011CB013606);广州市属高校科技计划项目(1201421152)~~

摘　　要：将支座、同材质橡胶块体和橡胶片放置在同样的试验环境下开展试验,建立天然橡胶材料老化后硬度与距表面距离的变化规律公式。利用ABAQUS软件,建立橡胶隔震支座的有限元分析模型,通过与试验数据的对比,验证模型的有效性。建立近海桥梁中隔震橡胶支座沿厚度方向不同硬度变化的不均匀老化模型,进而开展不均匀老化对竖向刚度及水平刚度的影响分析。建立考虑不均匀老化后的橡胶隔震支座刚度计算公式,提出隔震支座性能老化简易预测方法。研究结果表明:不均匀老化会导致橡胶支座平面各点竖向应变不均匀,在长期荷载和老化作用下,会使支座内部产生损伤;支座水平刚度主要与老化区域有关,与加载方向没有关系。The natural rubber bearing, rubber block and rubber sheet with the same rubber material were put forward together on the same experimental condition to test, and the changing rule formula of the rubber hardness over the distance from the surface distance was established. Based on the above research, the finite element analysis model of the rubber bearing was set up by use of ABAQUS software. After comparing the testing data and the finite element analysis results, the effectiveness of the finite element model was verified. And then, the uneven aging model of the natural rubber bearing was established; hardness was changed in distance from the surface; the uneven aging influence analysis on mechanical property of the rubber bearing was carried out. The stiffness calculation formula of the rubber bearing considering uneven aging was put forward, and a simplified method to estimate aging performance of the rubber bearing was given. The results show that uneven aging will result in the uneven vertical strain of bearing surface, and the rubber bearing will be damaged under long-term load and aging; the horizontal stiffness of the rubber bearing is related with aging area, but is irrelevant to the loading direction.

关 键 词：近海桥梁 不均匀老化 天然橡胶隔震支座 硬度 有限元分析 

分 类 号：P315.966[天文地球—地震学]