地基液化条件下高层建筑结构动力响应振动台试验研究  

Shaking table tests on dynamic response of high-rise building structures on liquefied foundation

作　　者：戴启权 钱德玲[1] 蒋玉敏 DAI Qiquan;QIAN Deling;JIANG Yumin(College of Civil Engineering,Hefei University of Technology,Hefei 230009,China;Tianjin Research Institute for Water Transport Engineering of China Ministry of Transport,Tianjin 300456,China;North China Municipal Engineering Design&Research Institute Hefei branch,Hefei 230022,China)

机构地区：[1]合肥工业大学土木与水利工程学院,安徽合肥230009 [2]交通运输部天津水运工程科学研究所,天津300456 [3]中国市政工程华北设计研究总院有限公司合肥分公司,安徽合肥230022

出　　处：《建筑结构学报》2021年第7期30-37,共8页Journal of Building Structures

基　　金：国家自然科学基金项目(51378168);中央级公益性科研院所基本科研业务费专项(TKS190203)。

摘　　要：为了研究地基液化对高层建筑结构的影响和破坏,利用室内模拟地震振动台,再现高层建筑结构倾斜大位移灾害。获取地基砂土层不同位置的液化程度,确定影响范围,分析高层建筑结构倾斜灾变过程中结构的水平位移、基频和阻尼比、振型曲线以及各部位动应变响应的变化规律,研究地基液化对高层建筑结构动力响应的影响。研究表明:随着地震波峰值加速度的不断增大,地基液化程度不断提高、液化范围不断加大;高层建筑结构水平位移与地基液化状态具有明显正相关性,结构水平位移增幅随地基超孔压增幅的增大而增大;随着地震波峰值加速度的不断增大,结构的基频逐渐下降,阻尼比逐渐升高;结构1阶振型具有弯剪型特点,试验过程中振型曲线的形状基本一致,说明结构损伤不明显,刚度变化很小;由于地基液化导致高层建筑结构倾斜灾变,结构发生应力重分布,重分布之后结构各部位应变值趋于稳定。In order to study the influence and damage of foundation liquefaction on high-rise building structures, the inclined large displacement of a high-rise building structure was reproduced by using the indoor shaking table which can simulate seismic waves. The liquefaction and its influence range at different locations of the sand layer were obtained, and the changing rules of horizontal displacement, fundamental frequency and damping ratio, mode curves and strain response of high-rise building structures in the process of an inclined catastrophe were analyzed. In addition, the influence of foundation liquefaction on the dynamic response of high-rise building structures was studied. The research results show that the degree and scope of foundation liquefaction increase with the increase of peak accelaration. The liquefaction state of foundation is positively correlated with the horizontal displacement of high-rise building structures. With the increase of peak accelaration, the fundamental frequency of the structure decreases and the damping ratio increases gradually. The first-order mode curves of the structure have the characteristics of bending and shearing, and the shape of the mode curves are basically the same in the test process, which indicate that the damage of the structure is not obvious and the change of stiffness of the structure is small. Due to the inclined catastrophe of high-rise building structure caused by foundation liquefaction, the stress redistribution of the structure occurs, after which the strains of each structural component tend to be stable.

关 键 词：高层建筑结构 地基液化 振动台试验 倾斜灾变 动力响应 

分 类 号：TU973[建筑科学—结构工程] TU317.1