钢筋混凝土框筒结构振动台试验研究

Shaking Table Test Study of RC Frame Tube Structures

本文通过几何比例为1∶20的15层钢筋混凝土框筒结构的一系列振动台试验,分析了框筒结构的自振频率和振型的变化规律,研究了在单向(水平或竖向)和双向(水平与竖向)地震作用下的框筒结构的动力反应及其破坏机理,着重探讨了竖向地震对框筒结构地震反应的影响。实验结果表明,在弹性范围内,框筒结构在水平和竖向地震波作用下,当水平地震波保持不变时,结构的竖向加速度反应随竖向地震波量级的增大而增大,而水平位移和水平加速度反应保持不变。竖向地震是引起结构破坏的主要因素之一,因此在设计时应考虑竖向地震的作用。

In the paper,through a series of shaking table tests on a 15-story regularly hexagonal rein- forced concrete frame-tube model with 1∶20 scale,the regularities of natural frequencies and mode shapes of the structure are analyzed,the dynamic responses of the structure under one-dimensional (horizontal or vertical)and two-dimensional(horizontal and vertical)earthquake waves are studied. Especially,the influences of vertical waves on dynamic response and the failure mechanism of the structure are emphatically discussed.The experimental results show that,in the elastic range,when a frame tube structure is acted upon by horizontal and vertical earthquake waves,if the horizontal wave remains unchanged,the vertical acceleration response increases as the vertical earthquake wave be- comes stronger,but the horizontal displacement and acceleration response remain the same.The verti- cal earthquake wave is a mian factor to cause the failure of the frame tube structure,therefore it must be considered in the design of the structure.