考虑不同摩擦界面的板式橡胶支座滑动力学特性试验  

Experimental study on sliding mechanical characteristics of laminated-rubber bearings considering different friction interfaces

作　　者：崔皓蒙 邵长江[1,2] 漆启明 王春阳 庄卫林[1,2] 王志翔 CUI Haomeng;SHAO Changjiang;QI Qiming;WANG Chunyang;ZHUANG Weilin;WANG Zhixiang(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;National Engineering Research Center for Geological Disaster Prevention Technology in Land Transportation,Southwest Jiaotong University,Chengdu 610031,China;School of Architecture and Civil Engineering,Chengdu University,Chengdu 610106,China)

机构地区：[1]西南交通大学土木工程学院,成都610031 [2]西南交通大学陆地交通地质灾害防治技术国家工程研究中心,成都610031 [3]成都大学建筑与土木工程学院,成都610106

出　　处：《振动与冲击》2024年第22期209-216,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金(51978581,51178395);四川省应用基础研究重点项目(2017JY0059)。

摘　　要：板式橡胶支座广泛应用于我国量大面广的中小跨径公路梁桥中,由于其放置形式而受到钢及混凝土界面的约束作用,加之其构造特点进而易于在不同摩擦界面发生非常规的滑动行为。为此,基于钢板+混凝土板、钢板及混凝土板三类摩擦界面,设定不同的竖向压应力及加载速率两类滑动条件,通过支座拟静力加载以对比分析其变形状态及滞回行为,系统探讨不同摩擦界面的支座滑动、刚度、摩擦、耗能及恢复力特性。结果表明:板式橡胶支座变形现象为剪切变形、翘曲卷边和滑动,滞回环由狭长梭形逐渐变为双线性;不同摩擦界面及不同滑动条件在相同加载等效剪切应变条件下的变形阶段及变形状态相异;橡胶的黏结效应使之与摩擦界面间产生附着摩擦作用,导致支座在滑动过程中出现力学性能的变化,恢复力模型可取为三折线;由于附着摩擦作用的差异,钢板+混凝土板及钢板的界面摩擦因数与滑动速率呈正相关,与压应力呈负相关,而混凝土板的界面摩擦特性不稳定,对应摩擦因数与两类滑动条件皆呈负相关趋势;总体而言,钢板+混凝土板的界面摩擦因数较小,相应支座滑动力较小,剪切刚度较小,呈现为滑动位移较大,耗能充分,其次分别为钢板和混凝土板。Laminated-rubber bearings are widely used in small-to-medium-span highway bridges and are of large quantity and wide spreading area in China.By virtue of the placement form,the bearings are constrained by the steel and concrete interfaces,and are prone to occur unconventionally sliding on different friction interfaces due to their structural characteristics.Therefore,based on three types of friction interfaces:steel plate + concrete slab,steel plate and concrete slab,two kinds of sliding conditions for vertical compressive stress and loading rate were set for each type of friction interface.The deformation states and hysteresis behaviors were analyzed and compared through quasi-static loading,and the sliding,stiffness,friction,energy consumption,and restoring force characteristics of the bearing on different friction interfaces were systematically explored.The results show that the deformation shapes of the laminated-rubber bearing are shear deformation,warping,curling,and sliding,and the hysteresis loop gradually changes from a narrow shuttle shape to a bilinear shape.The deformation stages and states of the bearing on different friction interfaces and sliding conditions under the same loading equivalent shear strain conditions are different.The adhesion friction between rubber and friction interface is due to the adhesive effect of rubber,resulting in changes in the mechanical properties of the bearing during sliding,and the restoring force model can be taken as a trilinear.Due to the difference in adhesive friction,the interface friction coefficients of steel plate + concrete slab and steel plate are positively correlated with sliding rate and negatively correlated with compressive stress.However,the interface friction characteristics of concrete slab are unstable,and the corresponding friction coefficient shows a negative correlation trend with both kinds of sliding conditions.Overall,the interface friction coefficient of the bearing with steel plate + concrete slab friction interface is relatively small,resu

关 键 词：摩擦界面 板式橡胶支座 摩擦滑动 力学特性 附着摩擦 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]