传统风格建筑RC-CFST组合框架拟动力#br# 试验及弹塑性地震反应分析

对一缩尺比为1/2的传统风格建筑钢筋混凝土(RC)-钢管混凝土(CFST)组合框架模型进行El Centro波、Taft波、兰州波及汶川波等地震波作用下的拟动力试验，得到该模型的自振频率以及加速度、位移和应变等动力响应。分析模型结构的破坏过程、恢复力特征曲线及变形能力等抗震性能。研究表明：乳栿为模型结构的第一道抗震防线；随着输入地震波加速度峰值的增加，框架模型的自振频率下降，加速度放大系数逐渐减小，模型结构的恢复力特征曲线呈现出一定程度的“捏缩”效应。由应变分析可知，金柱纵筋先于檐柱纵筋屈服；乳栿和混凝土柱为模型结构的主要耗能构件。基于试验研究结果，采用有限元分析软件SAP2000对试验模型框架进行弹塑性地震反应分析，计算结果与试验实测结果吻合较好。计算分析结果表明：模型框架的出铰顺序依次为乳栿两侧、金柱柱底、檐柱柱底、金柱CFST柱底部及檐柱CFST柱底部。在峰值加速度为0.70g的El Centro波作用下，模型柱架的极限弹塑性层间位移角与规范规定的限值较为接近，表明框架结构具有较高的抗震安全储备。

Pseudo-dynamic test and elasto-plastic seismic response analysis of RC-CFST composite frame model of traditional-style building

Pseudo-dynamic tests on a 1/2-scale reinforced concrete (RC)-concrete filled steel tube (CFST) composite frame model of traditional-style building were carried out under the seismic excitation of El Centro wave, Taft wave, Lanzhou wave and Wenchuan wave. The natural frequency and the responses of acceleration, displacement and strain were attained. Failure process, restoring force characteristic curves and deformation capacity were investigated. The results indicate that Rufu beams play the role of first seismic fortification line of model structure. With the increase of input peak ground acceleration, the natural frequency and the acceleration amplification factor decrease gradually. Meanwhile, the pinching phenomenon of hysteretic loops can be observed. The strain analyses indicate that longitudinal bars in corner columns yield before those in side and middle columns. Rufu beams and concrete columns are the main energy dissipation components of the model structure. Based on the experimental study, the elasto-plastic seismic response analysis was conducted by using the SAP2000 software. The elasto-plastic seismic response analysis results agree well with the test ones. The calculated results show that the order of plastic hinges in the model is as follows: firstly Rufu beam ends, then inner columns bottom, side columns bottom, finally inner CFST column bottom and side CFST columns bottom. Under the seismic input of El Centro wave with a peak acceleration of 0.70g, the ultimate elasto-plastic story drift rotation of columns approaches to the limit value specified in the seismic code, indicating that the frame structure has a high seismic safety reservation.