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为进一步研究钢管混凝土柱-钢梁半刚性框架的抗震性能,以缩尺比例1/3的方钢管混凝土柱-钢梁半刚性框架模型为研究对象,模拟地震荷载作用下结构动力性能的试验研究,其中采用不同峰值加速度的El Centro波及Kobe波作为输入地震波分别模拟不同地震作用。通过试验得到钢框架结构各主要构件的应变响应、位移响应、基底剪力、刚度退化和滞回曲线,并用MATLAB软件编制了时程分析程序,对试验框架模型进行弹性时程分析,最后将分析结果与试验结果进行对比分析,两者较为吻合。分析结果表明:随着地震作用的加强,结构刚度逐渐退化,结构基频下降;试验框架模型的滞回曲线比较饱满,表明框架具有很好的延性和耗能能力,抗震性能良好,其破坏模式是钢梁转角过大引起的节点顶部和底部角钢的过大变形,而其他主要构件则表现良好,未受到大的破坏。
In order to further study the seismic behavior of concrete filled steel tube column-steel beam semi-rigid frame, a semi-rigid frame model of square concrete-filled steel tube column-steel beam with a scale of 1/3 was used as the research object to simulate the dynamic behavior of the structure under seismic load , Of which El Centro waves and Kobe waves with different peak accelerations are used as input seismic waves to simulate different seismic actions respectively. The strain response, displacement response, base shear, stiffness degeneration and hysteresis curve of the main components of the steel frame structure are obtained through experiments. The time history analysis program is compiled by using MATLAB software, and the elastic time history analysis of the test frame model is carried out. Finally, Results and test results for comparative analysis, the two are more consistent. The results show that with the strengthening of seismic action, the stiffness of the structure gradually degenerates and the fundamental frequency of the structure decreases. The hysteresis curve of the experimental frame model is quite full, which shows that the framework has good ductility and energy dissipation capability, good seismic performance, and its failure mode Is excessive deformation of the top and bottom corners of the node caused by excessive cornering of the steel beam, while other major components perform well without major damage.