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摒弃传统的梁端对称加载方式,采用更符合实际受力特点的柱端加载,对剖分T形钢连接的中框架节点进行低周反复试验研究。试验结果表明:加载过程中T形件翼缘与腹板交界处的应力最大,最先形成塑性铰;柱翼缘和梁翼缘在加载过程中均处于弹性阶段,而节点域的剪切应变达到了屈服应变。并且由滞回曲线和骨架曲线可知该节点具有较好的延性和耗能特性。
Abandoning the traditional beam end symmetrical loading method, the column end loading which is more in line with the actual force is used to conduct the low-cycle repeated test on the mid-frame joints of the split T-shaped steel. The experimental results show that the stress of the T-shaped flange and the web at the junction of the web and the web is the highest, and the plastic hinge is the first to be formed. The column flange and the flange of the beam are all in the elastic phase during the loading process, Yield strain. And from the hysteresis curve and the skeleton curve shows that the node has good ductility and energy dissipation characteristics.