不同场地多层基础隔震结构振动台试验对比研究
发布时间：2018-10-20 20:17
【摘要】：通过开展土-隔震结构动力相互作用体系的大型振动台模型对比试验,研究了刚性地基、硬土地基和软夹层地基3种不同地基上多层隔震结构的地震反应特征和基础隔震效果。结果表明:SSI效应对隔震结构动力特性的影响与地基土性密切相关,当地基土性由刚变柔时,隔震结构体系的一阶自振频率明显降低,阻尼比也明显增大;不同土性地基上SSI效应对隔震结构地震反应的影响并不相同,软夹层地基上SSI效应可能增大也可能减小隔震结构的地震反应强度,而硬土地基上考虑SSI效应时隔震结构的地震反应与刚性地基时的地震反应差别较小;不同土性地基上SSI效应对隔震结构基础隔震效率的影响与地基土性、输入地震动的特性和峰值等相关,其中地基土性的影响最为明显,地基土性越软,基础隔震效率越低。
[Abstract]:Through the comparative tests of large-scale shaking table models of soil-isolation structure dynamic interaction system, the seismic response characteristics and foundation isolation effect of multi-layer isolated structures on three different foundations, rigid foundation, hard soil foundation and soft sandwich foundation, are studied. The results show that the influence of SSI effect on the dynamic characteristics of isolated structures is closely related to the soil properties of the foundation. When the soil property of the foundation is changed from rigid to flexible, the first order natural vibration frequency of the isolated structure system is obviously reduced, and the damping ratio is obviously increased. The effects of SSI effect on seismic response of isolated structures on different soil foundations are different. The SSI effect on soft sandwich foundations may increase or decrease the seismic response intensity of isolated structures. The difference between seismic response of isolated structure and rigid foundation is small when SSI effect is considered on hard soil foundation, and the influence of SSI effect on isolation efficiency of isolation structure foundation and soil property of foundation on different soil foundation. The characteristic of the input ground motion is related to the peak value, among which the influence of the soil property of the foundation is the most obvious, and the softer the soil property of the foundation, the lower the isolation efficiency of the foundation is.
【作者单位】： 南京工程学院建筑工程学院;南京工业大学交通学院;保利江苏房地产发展有限公司;
【基金】：江苏省自然科学基金青年基金项目(BK2012477) 南京工程学院校级科研基金项目(CKJA201505)资助
【分类号】：TU311.3
，
本文编号：2284282
[Abstract]:Through the comparative tests of large-scale shaking table models of soil-isolation structure dynamic interaction system, the seismic response characteristics and foundation isolation effect of multi-layer isolated structures on three different foundations, rigid foundation, hard soil foundation and soft sandwich foundation, are studied. The results show that the influence of SSI effect on the dynamic characteristics of isolated structures is closely related to the soil properties of the foundation. When the soil property of the foundation is changed from rigid to flexible, the first order natural vibration frequency of the isolated structure system is obviously reduced, and the damping ratio is obviously increased. The effects of SSI effect on seismic response of isolated structures on different soil foundations are different. The SSI effect on soft sandwich foundations may increase or decrease the seismic response intensity of isolated structures. The difference between seismic response of isolated structure and rigid foundation is small when SSI effect is considered on hard soil foundation, and the influence of SSI effect on isolation efficiency of isolation structure foundation and soil property of foundation on different soil foundation. The characteristic of the input ground motion is related to the peak value, among which the influence of the soil property of the foundation is the most obvious, and the softer the soil property of the foundation, the lower the isolation efficiency of the foundation is.
【作者单位】： 南京工程学院建筑工程学院;南京工业大学交通学院;保利江苏房地产发展有限公司;
【基金】：江苏省自然科学基金青年基金项目(BK2012477) 南京工程学院校级科研基金项目(CKJA201505)资助
【分类号】：TU311.3
，
本文编号：2284282
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