低温环境对叠层橡胶支座变形特性影响的试验研究

Low-Temperature Effect on Deformation Behavior of Laminated Rubber Isolators

为探索低温变化对叠层橡胶支座变形特性的影响,利用沈阳冬季寒冷环境温度对两种叠层橡胶支座在不同温度下进行刚度对比试验,证明了低温变化对橡胶支座垂直压缩刚度均有较大影响,对水平刚度影响随橡胶支座胶质及制作工艺不同而不同,同时也证明了橡胶支座水平刚度随压应力增大而增大,以及往复水平荷载作用下两种橡胶支座的水平刚度变化特性,设计使用叠层橡胶支座时,应给出不同环境温度下的垂直压缩刚度及水平刚度·

To understand in depth how low temperature affects the deformation behavior of the laminated seismic isolation devices made of rubber-steel plate, two kinds of those isolators were investigated experimentally in Shenyang where the weather is quite cold in winter for comparison. The test proved that low temperature affects prominently the vertical compressive stiffness, while its effect on horizontal stiffness varies with the quality and manufacturing process of the laminated rubber. Moreover, the horizontal stiffness rises with increasing compressive stress, with the horizontal stiffness variabilities of the two laminated rubber isolators under to-and-fro horizontal load revealed. An advice is thus given that the vertical compressive stiffness and horizontal stiffness should be taken into account when designing and using laminated rubber isolators.