环境温度对板式橡胶支座摩擦滑移性能的影响分析

采用有限元模拟的方式,对板式橡胶支座摩擦滑移特性进行分析,并与常温试验中获得的支座摩擦滑移滞回曲线、等效黏滞阻尼比等进行了对比。在获得可靠模型的基础上,分析环境温度对板式橡胶支座摩擦滑移特性的影响,研究了温度与支座摩擦滑移耗能、等效黏滞阻尼比和滑动起始距离的关系。结果表明:(1)板式橡胶支座的有限元模型可以较好地实现支座在水平荷载作用下的摩擦滑移特性;(2)在±25℃温度范围内,温度越低,板式橡胶支座在摩擦滑移过程中耗能越多,最大相差37.5%。在寒冷地区,支座将更早的进入滑移状态,对采用板式橡胶支座的桥梁更应注意控制桥梁上部结构的支承长度;(3)板式橡胶支座的黏滞阻尼比随着形状系数的减小而增大,而支座的起始滑移距离则随之减小。

Influence of Environmental Temperature on the Frictional Sliding Performance of Plate Rubber Bearings

The environmental temperature can affect the physical properties of rubber, thus influence the dynamic response of plate rubber bearings under earthquake. In this paper, the finite element method was used to analyze the frictional sliding characteristics of plate rubber bearings. The hysteretic curve and equivalent viscous damping ratio of the bearing were compared with those obtained from normal temperature experiment. Based on a reliable model, the influence of environmental temperature on the friction sliding characteristics of plate rubber bearing was analyzed. Relationship between the temperature and the energy consumption, the equivalent viscous damping ratio, and the starting distance of sliding were also studied. The results showed that: (1) The finite element model can well show the frictional sliding characteristics of plate rubber bearing under horizontal load; (2) Within the temperature range studied in this paper, the lower the temperature, the more energy consumption of plate rubber bearing in the friction sliding process, and the bearing will earlier enter the sliding state. So it is important to control the supporting length of upper structure of the bridge in cold area. (3) With the decrease of shape coefficient, the viscous damping ratio of plate rubber bearing is increased, and the initial sliding distance of the bearing was decreased.