过渡平板支座节点在超低周疲劳试验中锚栓的损伤累积试验研究

灾难地震作用下网格结构的支座节点由于损伤累积导致节点软化,对整体结构性能影响很大。为研究过渡平板支座节点在超低周疲劳试验过程中的破坏形式,设计了支座节点的双向加载试验装置,对支座节点进行超低周疲劳试验,研究支座锚栓的破坏过程,得到锚栓在加载过程中的倾角变化规律以及支座整体转角变化规律。结果表明:过渡平板支座节点在试验过程的破坏形式均为锚栓断裂,锚栓断口有明显的超低周疲劳破坏特征,锚栓倾角和支座节点整体转角的变化可以反映支座节点中锚栓损伤程度,可为震后评定支座节点的状态提供参考。

Damage Accumulation Test of Anchor Bolts in Ultra-low Cycle Fatigue Test for Transition Plate Bearing Joints

Under the action of catastrophic earthquake, the nodes of grid structure soften due to the accumulation of damage, which has a great influence on the overall structural performance. To study the failure forms of transition plate bearing joints during ultra-low cycle fatigue test, a bidirectional loading test device was designed for bearing joints, and ultra-low cycle fatigue test was carried out for bearing joints, the failure process of the anchor bolt was studied, and the variation rules of the anchor bolt''s inclination angle and the overall rotation Angle during the loading process were obtained. The results show that the failure forms of the transition plate bearing node in the test process are all anchor bolt fracture, and the anchor bolt fracture has obvious ultra-low cycle fatigue failure characteristics. The changes of anchor bolt inclination angle and overall rotation angle of the bearing node can reflect the degree of anchor bolt damage in the bearing node, which can provide a reference for evaluating the state of the bearing node after earthquake.