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基于可恢复功能结构的理念,提出新型自复位预应力预制节点(PTED节点),该节点通过预应力筋和高强摩擦螺栓将预制梁、柱和耗能角钢拼接在一起形成节点,预应力筋、梁、柱和耗能角钢可看作节点的组件。为了研究节点组件对节点受力性能的影响,进行了系列的低周往复加载试验,首先对PTED边节点进行试验,研究PTED节点整体的抗震性能,然后用新角钢更换受损的角钢,重新对其进行低周往复加载,探讨更换受损角钢后节点的抗震能力,然后分别试验研究了预应力筋和角钢对节点的受力性能的贡献。试验结果表明PTED节点是PT节点与ED节点的组合,节点在具有较好的自复位能力的同时,还具有较好的耗能能力。节点层间位移角加载到4%时,梁、柱及预应力筋基本保持弹性,可重复使用;节点损伤主要集中在角钢上,更换受损角钢后,节点的抗震能力基本等同于未受损的节点。
Based on the idea of recoverable functional structure, a new type of self-reset prestressed prefabricated node (PTED node) is proposed. The prefabricated beam and the high-strength friction bolt connect the prefabricated beam, column and energy dissipation angle steel together to form the joint, Beams, columns and energy-consuming angles can be considered as components of joints. In order to study the effect of node components on the force performance of joints, a series of low-cycle reciprocating loading tests were carried out. Firstly, the PTED edge nodes were tested to study the overall seismic performance of PTED nodes. Then, The low-frequency reciprocating loading is carried out to study the seismic capacity of the joints after the damaged angle is changed. Then, the contribution of the prestressing tendons and angles to the stressing behavior of the joints is studied respectively. The experimental results show that the PTED node is a combination of PT node and ED node, and the node has better self-resetting capability as well as better energy dissipation capability. When the displacement angle between nodes is 4%, the beams, columns and prestressing tendons are basically elastic and can be reused. The damage of joints is mainly concentrated on the angle steel. After replacing the damaged angle steel, the seismic resistance of the joints is almost equal to that of the intact ones The node.