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为了了解土与结构的相互作用,在土槽中进行1∶4钢框架的激振试验,试验通过改变上部结构刚度,分别输入高斯白噪声测自振周期,EL波和Taft波研究其动力反应及土体对上部结构的减震效果,与有限元软件SAP2000模拟刚性地基上的钢框架做动力反应分析对比,发现自振周期有一定差异,上部结构刚度越大附加周期越大,附加周期最大值达到0.22 s。土体对钢框架有一定的减震效果,这种减震效果主要跟上部结构刚度变化有关,由于土-结构相互作用,钢框架在土槽中激振时顶层加速度峰值比在刚性地基上激振时减小,折减系数达0.661,而顶层位移峰值则增大。
In order to understand the interaction between soil and structure, the vibration test of 1: 4 steel frame was carried out in a soil tank. By changing the stiffness of the superstructure, the spontaneous vibration period, the EL wave and the Taft wave were respectively input into Gaussian white noise to study the dynamic response And the damping effect of the soil on the superstructure is compared with the dynamic response analysis of the steel frame on the SAP2000 simulating rigid foundation by the finite element software. It is found that there are some differences in the periods of natural vibration. The greater the superstructure stiffness is, the larger the additional period is and the additional period is the largest The value reaches 0.22 s. The soil has a certain damping effect on the steel frame. The damping effect is mainly related to the change of the stiffness of the superstructure. Due to the soil-structure interaction, the peak acceleration of the top steel layer is higher than that of the rigid foundation when the steel frame is excited in the soil tank The vibration time decreases, the reduction coefficient reaches 0.661, while the top displacement peak increases.