考虑SSI效应及支座转动的隔震体系性能研究

发布时间：2018-06-23 00:10

本文选题：土-结构相互作用 + 基础隔震　；参考：《土木工程学报》2016年S1期

【摘要】：土-结构相互作用对结构的地震反应有着重要的影响。隔震支座竖向变形引起的隔震层转动会加剧上部结构的摇摆,进而放大结构的地震响应。提出基于Timoshenko理论的考虑SSI效应及隔震层转动影响的隔震结构通用计算模型,推导并求解结构运动方程,采用虚拟激励法进行随机响应分析,进一步研究隔震层转动刚度、土体参数等对隔震结构地震响应的影响规律。分析表明:SSI效应降低了隔震效果,其对隔震结构楼层转角位移放大的影响与土-结构刚度比有关。隔震层转动刚度变化对隔震结构顶层加速度、基底倾覆力矩等影响较小,但对结构楼层转角位移有较大影响,隔震层转动刚度取值较小时,上部结构楼层转角甚至会出现大于抗震结构的情况。
[Abstract]:Soil-structure interaction plays an important role in the seismic response of structures. The rotation of the isolation layer caused by vertical deformation of the isolation support will aggravate the rocking of the superstructure and then amplify the seismic response of the structure. Based on Timoshenko's theory, a general calculation model of isolated structure considering SSI effect and the effect of isolation layer rotation is proposed. The motion equation of the isolated structure is derived and solved. The random response analysis is carried out by using the virtual excitation method, and the rotational stiffness of the isolation layer is further studied. The influence of soil parameters on seismic response of isolated structures. The analysis shows that the effect of the one-SSI effect decreases the isolation effect, and the influence of the influence on the floor angular displacement amplification of the isolated structure is related to the soil-structure stiffness ratio. The rotational stiffness of the isolation layer has little effect on the acceleration of the top layer and the overturning moment of the base, but it has a great influence on the angular displacement of the structure floor, and the rotational stiffness of the isolation layer is small. The upper structure floor corner will even be larger than the earthquake-resistant structure.
【作者单位】：广州大学;
【基金】：长江学者和创新团队发展计划(IRT13057) 国家自然科学基金(51478129)、国家自然科学基金(51478131) 河南省高等学校重点科研项目计划(16A560017)
【分类号】：TU352.12

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