自复位预制框架边节点组件受力性能试验研究

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。

EXPERIMENTAL STUDY ON PERFORMANCE OF COMPONENTS OF THE EXTERIOR SELF-CENTERING POST-TENSIONED PRECAST CONNECTIONS

A new kind of the self-centering post-tensioned precast connection (simplified as PTED) is proposed based on the concept of the earthquake resilient structure. The PTED connection is composed by precast beams, columns and angles that are connected by frictional high-strength bolts and tendons. Tendons, beams, columns and angles could be recognized as the components of the connection. In order to study the effect of components on the performance of the connection, a series of the low reversed cyclic loading tests were conducted. Firstly, tests of a PTED connection were made for studying the seismic performance of the integral connection. Subsequently, tests on the same connection were repeated to study the seismic performance of the connection with replaced new angles. Respective contributions of the angles and tendons to the performance of the connection were also investigated by the tests. The test results show that the combined effect of PT connection and ED connection consist of the overall performance of the PTED connection; the connection not only has good self-centering capacity but also performs well in energy dissipation; in general, beams, columns and tendons remain elastic and could be reused if the story drift is not more than 4%; in addition, damage of the connection concentrates in the angles themselves that are replaceable; seismic performance of the connection with replaced new angles is basically the same as the original one.