高层建筑长周期地震反应子结构试验近似模拟方法

Approximate Simulation Method for Long-period Seismic Response of Tall Buildings Based on Substructure Test

提出了一种利用子结构振动台试验近似模拟高层建筑长周期地震反应的改进方法。通过在子结构模型底部设置橡胶垫-质量块装置产生放大作用来弥补现有振动台的试验能力,通过定义传递函数和整体结构目标加速度反应卷积来反推子结构模型的新输入地震动,基于SAP2000软件分别进行20层整体结构模型和2层子结构模型地震线性时程反应分析。对比结果表明,不同地震作用下,两者的顶层目标加速度反应符合较好。研究成果对于拓展地震模拟振动台空间尺度和负载应用方面有一定的参考意义,为长周期作用下高层建筑反应模拟提供一种新的研究方法。

An improved substructure shaking table test method was proposed in this paper to sim ulate the long-period seismic response of tall buildings approximately. The amplification effect of mass and rubber device installed at the bottom of substructure was used to break through the acceleration input limit of conventional shaking table test. The new input ground motion of sub- structure model was back-derived through the definition of convolution between the transfer function and the target acceleration response of whole structure. The linear seismic time-history re sponse analysis of whole structure model with twenty-storeys and substructure model with two storeys were established respectively based on SAP2000 finite element analysis software. Compared with the response subjected to different earthquake, the results show that the target acceleration response of substructure model agrees well with that of whole structure model. The research results have some reference meaning for the space scale and load application of earthquakesimulating shaking table test, and provide a new research method for simulating the long-period seismic response of tall buildings.