近断层地震作用下基础隔震层弹簧限位振动台试验研究

Shaking Table Test Study on Spring Limiting Deformation to Base Isolation Layer under Near-field Ground Motion

近断层脉冲型地震作用下基础隔震结构隔震层会产生过大变形,导致隔震支座侧倾失稳,隔震体系破坏。本文设计制作了一个3层基础隔震钢框架试验模型与三类钢弹簧软碰撞限位器,进行了近断层脉冲型地震作用下基础隔震层软碰撞限位振动台模型试验。试验表明,弹簧限位器具有很好的弹性性能,近断层地震作用下基础隔震层软限位可有效控制隔震层变形,隔震结构体系减震效果良好。

The near-field pulse-type ground motion will bring about large deformation of base isolation layer. The isolation bearings will buckle instability, and the isolation system will be destroyed. Three spring limiting devices are designed and tested. The test results show that the devices own favorable elastic properties. A 3-story base isolation frame model is made of steel. The shaking table model tests are carried out under near-field ground motion whose isolation layer is protected by spring limiting devices. The base isolation layer obtains desired results of soft limiting deformation. The effect of limiting isolation system mitigating earthquake hazard is still very well.