在实验室通过拟静力试验对钢结构构件进行低周反复加载,通过测定构件的位移和应变,分析应变的变化规律,并对其受力过程中的滞回曲线进行分析,得出影响节点强度退化的一些规律,同时通过在腹板处人为制造裂缝,研究其受力特征及对节点损伤性能的影响。由构件的强度退化曲线可知:随着加载位移的增加,强度退化趋势增大,节点在疲劳荷载作用下,累计损伤会越来越明显,致使强度开始退化,随着反复荷载的作用,裂缝进一步扩大,导致节点刚度退化。钢材屈服后进入弹塑性状态,由于累积损伤,节点刚度也在迅速退化。 Through the quasi-static test in the laboratory, the steel structures were subjected to low-cycle loading repeatedly. The displacement and strain of the components were measured. The variation of strain was analyzed and the hysteresis curve was analyzed. Strength of some of the law of degradation, at the same time through the man-made cracks in the web to study the force characteristics and damage to the node performance. From the strength degradation curve of the component, it can be seen that as the loading displacement increases, the trend of strength degradation increases. Under the fatigue load, the cumulative damage will become more and more obvious, resulting in the strength degeneration. With the repeated loading, the crack further Expand, leading to node stiffness degradation. After yielding into the elasto-plastic state, due to cumulative damage, the node stiffness is rapidly deteriorating.