传统风格建筑钢筋混凝土-钢管混凝土组合框架模型振动台试验研究

为研究传统风格建筑钢筋混凝土-钢管混凝土(RC-CFST)组合框架的抗震性能，采用三维六自由度地震模拟振动台对缩尺比为1/4的模型结构进行了El Centro波、Taft波、兰州波及汶川波等地震波输入下的试验。通过白噪声扫描得到了该模型的自振频率、阻尼比等动力特性，研究了模型结构的受力过程、破坏特征及加速度、位移、剪力和应变等动力响应。试验结果表明：随着输入波地震峰值加速度的增加，框架模型的自振频率下降，阻尼比增大，加速度放大系数逐渐减小；柱架是耗散台面地震作用的主要构件；7度罕遇地震作用下结构X、Y向的最大层间位移角分别为1/46、1/51，结构的总体刚度偏小；结构的地震剪力沿模型高度方向没有明显下降的趋势, CFST柱顶部与枋、椽连接区域及柱底为结构的抗震薄弱环节。基于研究结果, 提出了加强该组合框架抗震性能的设计建议。

Shaking table test on RC-CFST composite frame model in traditional style building

In order to study the seismic behavior of reinforced concrete-concrete filled steel tube composite frame in traditional style buildings, a 1/4-scale model was tested on the three dimension six degree shaking table with the inputs of El Centro wave, Taft wave, Lanzhou wave and Wenchuan wave. Dynamic characteristics such as natural frequency, damping ratio were assessed through white-noise scanning. Loading process, failure characteristics, acceleration, displacement response, inter-story shear force and strain response were investigated. The test analysis indicates that the natural frequency descends, the damping ratio ascends and the acceleration amplifying factor decreases gradually with the increase of input peak ground acceleration. The column frame is the main component of decreasing seismic acceleration of the model. The maximum inter-story drifts are found to be 1/46 and 1/51 in directions X and Y under the seismic intensities of rare 7 degree which shows that the lateral stiffness of the structure is low. The seismic shear force does not decrease significantly along the height direction. The seismic properties of the connection area between beams and CFST columns and the base of column frame are weak. Base on the experimental study, some design recommendations for construction are put forward.