带抗拉装置高层隔震结构振动台试验研究

发布时间：2018-04-27 05:02

本文选题：高层建筑 + 基础隔震　；参考：《建筑结构学报》2017年07期

【摘要】：西昌(9度区)某高层基础隔震结构,其上部为框架-核心筒结构,总高度为58.3 m(不计入隔震层),隔震层采用铅芯橡胶隔震支座。为研究该隔震结构的抗震性能及检验带抗拉装置隔震支座的有效性,进行了缩尺比为1/15模型的模拟地震振动台试验。结果表明,隔震层降低了上部结构的加速度反应,隔震层上加速度放大系数小于0.5,可满足抗震设防烈度降低一度的设计目标;隔震结构的位移集中在隔震层,上部结构的层间位移较小,层间位移角满足规范层间位移角限值要求;隔震层力-位移滞回曲线较为饱满,具有良好的耗能能力。罕遇地震作用下,支座出现拉应力,说明隔震结构在高烈度地震作用下存在倾覆的可能性。对角部隔震支座加装抗拉装置后,再次进行振动台试验,结果表明,抗拉装置不会对结构水平向动力特性及支座在正常受压状态下的竖向运动和水平向运动产生显著影响,通过对比证明了其在隔震支座受拉情况下提供的有效抗拉作用。
[Abstract]:The upper part of the structure is frame-core tube structure, the total height is 58.3 m (excluding the isolation layer, the isolation layer adopts lead-core rubber isolation support. In order to study the seismic performance of the isolated structure and to test the validity of the isolation bearing with tensile device, the shaking table test was carried out with the scale ratio of 1 / 15 model. The results show that the isolation layer reduces the acceleration response of the superstructure, and the acceleration magnification factor on the isolation layer is less than 0.5, which can meet the design goal of reducing the seismic fortification intensity by one degree, and the displacement of the isolated structure is concentrated in the isolation layer. The interstory displacement of the superstructure is small, the interstory displacement angle meets the limit requirement of the standard interstory displacement angle, and the hysteresis curve of seismic isolation layer is full and has good energy dissipation ability. Under the action of rare earthquake, tensile stress appears in the bearing, which indicates the possibility of overturning the isolated structure under the action of high intensity earthquake. After adding tensile device to the angle isolation support, the shaking table test is carried out again. The results show that the tensile device has no significant effect on the horizontal dynamic characteristics of the structure and the vertical and horizontal motion of the bearing under normal compression. It is proved by comparison that its effective tensile action is provided in the case of isolation bearing under tension.
【作者单位】：同济大学土木工程防灾国家重点实验室;中船第九设计研究院工程有限公司;
【基金】：国家自然科学基金项目(51322803)
【分类号】：TU973

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