自然老化服役后板式橡胶支座摩擦滑移性能试验研究  

Experimental Study on Frictional Sliding Performance ofNaturally-Aged Laminated Rubber Bearings

作　　者：贾俊峰[1] 顾冉星 程寿山 樊平 李茂昌 JIA Junfeng;GU Ranxing;CHENG Shoushan;FAN Ping;LI Maochang(Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China;Bridge and Tunnel Research Center,Institute of Highway Ministry of Transport,Beijing 100088,China;Zibo Public Utility Service Center,Zibo 255090,China)

机构地区：[1]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124 [2]交通运输部公路科学研究所桥梁隧道研究中心,北京100088 [3]山东省淄博市公用事业服务中心,山东淄博255090

出　　处：《桥梁建设》2024年第3期31-38,共8页Bridge Construction

基　　金：国家自然科学基金面上项目(52178449);旧桥检测与加固技术交通行业重点实验室(北京)开放课题(2021-JQKFKT-4)~~。

摘　　要：为了解自然老化服役后板式橡胶支座的摩擦滑移性能,取实际桥梁中服役10年的7个板式橡胶支座进行摩擦滑移试验,分析不同竖向压应力下支座摩擦滑移规律,研究自然老化板式橡胶支座的水平弹性刚度、摩擦系数及耗能能力等,并对比人工热老化支座的相关性能。结果表明:相同服役年限的自然老化板式橡胶支座老化程度并不相同;自然老化板式橡胶支座摩擦系数随着竖向压应力的增大而减小,水平弹性刚度随着竖向压应力的增大而增大;压剪作用对老化板式橡胶支座的耗能能力影响较小,但需要注意累积的摩擦滑移会使支座耗能能力降低。自然老化板式橡胶支座(试验值)相较于未老化支座(理论值)的表面摩擦系数有所降低,但水平弹性刚度明显增大;自然老化板式橡胶支座水平弹性刚度增大幅度远高于人工热老化的板式橡胶支座,人工热老化研究严重低估了自然老化对板式橡胶支座的危害。This study investigates the frictional sliding performance of the naturally-aged laminated rubber bearings after serving for years.Seven laminated rubber bearings that had served for 10 years in an existing bridge were selected for the frictional-sliding tests,based on which multiple issues were analyzed and evaluated,including the frictional-sliding patterns,horizontal elastic stiffness,friction coefficient,and energy dissipation capacity of the naturally-aged bearings under varying vertical compressive stresses.It is shown that although the laminated rubber bearings selected for tests had the same service life,they displayed different degrees of aging.As the vertical compressive stresses increase,the friction coefficients decrease,whereas the horizontal elastic stiffness gets increased.The shear-compression interactions have a minor impact on the energy dissipation capacity of the naturally-aged laminated rubber bearings,but it must be noted that the cumulative frictional sliding would suppress the energy dissipation capacity of the bearings.Compared with the unaged bearings(theoretical values),the surface friction coefficients(experimental values)of the naturally-aged laminated rubber bearings are lower,but the horizontal elastic stiffness is remarkably higher.The increase in horizontal elastic stiffness in naturally-aged bearings is substantially greater than that observed in artificially-aged bearings,indicating that studies on artificial aging significantly underestimate the detrimental effects of natural aging on these bearings.

关 键 词：板式橡胶支座 自然老化 水平弹性刚度 摩擦系数 耗能能力 摩擦滑移试验 

分 类 号：U443.361[建筑科学—桥梁与隧道工程]