不同高宽比基础隔震结构振动台试验分析

Analysis of Vibration Table Test of Seismic Isolation Structures with Different Height-Width Ratio for Foundation

为了观察不同高宽比隔震效果的变化规律,建立4组框架结构模型,高宽比分别为1.0,2.0,3.0,4.0,分别输入不同加速度峰值的地震波,在砂-橡胶粒隔震垫层上进行振动台试验。试验结果表明:随高宽比比值的增大,隔震结构加速度响应随之增大,隔震效果呈降低的趋势;当地震波的加速度峰值较小时,砂-橡胶粒垫层的耗能减震能力不够明显,随着地震作用的增强,其隔震效果明显改善。本次试验反映了高宽比因素对结构隔震效应的影响;同时证明了在大震激励下,砂-橡胶粒垫层具有较好的耗能减震能力,为下一步在工程上的应用提供了试验依据。

In order to observe the seismic isolation effect of the structure with different height- width ratio,4groups of frame structure models with height- width ratio of 1. 0,2. 0,3. 0,4. 0 were constructed for vibration table test on the sand- rubber particle isolation cushion,under different peak acceleration of earthquake wave.The results showed that with the increase of the height- width ratio,the acceleration response of the isolation structure increases,and the seismic isolation effect decrease. When seismic peak acceleration is small,the effect of energy dissipation and vibration adsorption of the sand- rubber particle cushion is not obvious,and with the increase of earthquake intensity,the seismic isolation effect is improved significantly. The tests showed that the ratio of height to width of structure affects its seismic isolation effect,and under intensive earthquake excitation the sand- rubber particle cushion has good effect of seismic energy dissipation,which provides an experimental basis for engineering application in the future.