新型避雷针法兰节点滞回性能试验研究
Experimental Study on Hysteretic Performance of New Type Lightning Rod Flanged Joint
设计了四类新型避雷针法兰节点,开展避雷针节点在水平反复荷载作用下的滞回性能试验,研究法兰节点的破坏模态、应力发展及分布规律,对比四类法兰节点的荷载-位移滞回曲线、骨架曲线、刚度退化、耗能能力和延性系数。研究结果表明,刚性法兰节点S1、S2、S3在试件底部发生受压侧的局部屈曲以及受拉侧的钢管撕裂破坏,柔性法兰节点S4为上部钢管与法兰盘焊缝断裂;带环板或带芯管刚性法兰节点的延性优于传统刚性法兰节点;减少法兰节点加劲肋以及螺栓的S2、S4试件,其初始刚度、耗能能力下降;而增加芯管,可有效提升其滞回性能。
Four types of novel lightning rod flange joints were designed, and cyclic loading tests were conducted to investigate their hysteretic performance under horizontal repeated loads. The failure modes, stress development and distribution patterns of the flange joints were examined. The load-displacement hysteretic curves, skeleton curves, stiffness degradation, energy dissipation capacity, and ductility coefficients of the four flange joint types were compared. The results show that the rigid flange joints (S1, S2, and S3) exhibited local buckling on the compression side and steel tube tearing on the tension side at the bottom of the specimens, while the flexible flange joint (S4) failed due to fracture of the weld between the upper steel tube and the flange plate. The rigid flange joints with a ring plate or a core tube demonstrated better ductility than the conventional rigid flange joint. Reducing the stiffeners and bolts in the flange joint (as in specimens S2 and S4) led to decreases in initial stiffness and energy dissipation capacity, whereas adding a core tube effectively improved the hysteretic performance.
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