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基础隔震结构的抗倾覆性研究

2015-08-19王梦圆郑威施建波李玉荣

王梦圆++郑威++施建波++李玉荣

摘 要:为了了解砂与橡胶粒隔震垫层下隔震结构的抗倾覆特性,以砂与橡胶粒混合隔震垫层、纯砂隔震垫层、非隔震三种情况作为研究对象,建立4组高宽比为1.0,2.0,3.0,4.0的框架结构模型。通过抗倾覆性振动台试验,分析在不同垫层类型、垫层厚度、加速度峰值条件下的上部结构的抗倾覆性能。试验结果表明:结构的抗倾覆性能在砂与橡胶粒隔震垫层下要优于纯砂隔震垫层,非隔震情况下的抗倾覆性能最弱;当加速度峰值加大时,结构的抗倾覆性能随之降低。

关键词:振动台试验;隔震垫层;抗倾覆性

中图分类号:TU352.1 文献标志码:A 文章编号:1672-1098(2015)02-0032-05

(School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan Anhui 232001, China)

Abstract:Taking sand and rubber particle hybrid isolation cushion and pure sand isolation cushion and non-isolated as the research object, 4 groups of frame structure models with length-width ratio of 1.0, 2.0, 3.0, 4.0 were established respectively. The anti-overturning performance of the superstructure under different cushion types, cushion thickness and acceleration peak was analyzed with anti - overturning shaking table test. The experimental results showed that the structural anti-overturning performance of the sand and rubber particle hybrid isolation cushion is better than that of pure sand isolation cushion, and the structural anti-overturning performance of the non-isolated cushion is the weakest. With the increase of peak value of the acceleration, anti-overturning performance of the structure decreases.

Key words:shaking table test; vibration isolation cushion layer; anti-overturn performance

基础隔震技术是在基础与主体之间设置一道隔震层,将建筑物与基础隔开,依靠隔震层的变形吸收、消耗地震波传递的能量,减少震动对上部结构的作用或延长建筑物的基本周期,避免发生共振,从而达到隔震、减震的作用。文献[1]研究表明:橡胶粒的存在可以有效地降低橡胶粒-砂混合物的动剪切模量,使橡胶颗粒作为基础隔震体系成为可能。文献[2]中振动台试验研究数据更进一步证明了砂与橡胶粒混合隔震垫层有着较好的隔震效果,由于隔震垫层将隔震结构上、下断开,所以容易产生倾覆失稳问题,而高宽比比值是研究结构抗倾覆性能的关键影响因素,因此本文通过抗倾覆性振动台试验,研究砂与橡胶粒隔震垫层下隔震结构的抗倾覆特性。

1 基本假定

随着隔震技术研究的深入,基础隔震结构研究范围从低层建筑向多、高层建筑拓展。……

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