装配式可更换耗能铰滞回性能试验研究

EXPERIMENTAL STUDY ON HYSTERETIC PERFORMANCE OF REPLACEABLE ENERGY-DISSIPATING PREFABRICATED HINGES

提出一种可恢复功能装配式节点,由可更换耗能铰、约束节点核心区、预制梁柱等组成。可更换耗能铰为人工塑性铰,其滞回性能是装配式节点抗震性能的关键影响因素。将可更换耗能铰设置在装配式节点的预制梁与节点核心区外伸梁端之间,对其进行低周往复荷载作用下的滞回性能试验。在该试验的基础上仅更换耗能铰中破坏的金属阻尼器,进行第二次试验。考察可更换耗能铰的破坏模态、弯矩-转角滞回曲线、骨架曲线、承载能力、延性、能量耗散能力等抗震性能。通过两次试验的对比分析,揭示可更换耗能铰抗震性能的可恢复能力。结果表明:可更换耗能铰弯矩-转角滞回曲线饱满,转动能力与耗能能力强,延性良好,强度退化不明显;可更换耗能铰实现了装配式节点的损伤、破坏集中在耗能铰上,耗能铰耗散的能量占装配式节点耗散总能量的70%以上;两次试验中可更换耗能铰的各项抗震性能基本一致,说明更换破坏的金属阻尼器后,耗能铰抗震性能基本可恢复。

An earthquake-resilient prefabricated joint was proposed, which is composed of replaceable energydissipating hinges, core area of constrained joint, precast concrete beams and precast columns. The replaceable energy-dissipating hinge is an artificial plastic hinge, and its hysteretic performance is the key factor influencing the seismic performance of prefabricated joints. The replaceable energy-dissipating hinges were set between the precast beams and the extended beam in the core area of the prefabricated joint, and the hysteretic performance test under low-cycle reciprocating load was carried out. Following this test, only the metal dampers damaged in the energy-dissipating hinges were replaced, and a second test was conducted. The two tests were to investigate the seismic performance of the replaceable energy-dissipating hinges such as the failure mode, M-φ hysteresis curve, skeleton curve, bearing capacity, ductility and energy dissipation capacity. Through the comparative analysis of the two tests, the recoverability of the seismic performance of the replaceable energy-dissipating hinge was revealed. The results show that the replaceable energy-dissipating hinge has a full hysteresis curve, strong rotation capacity, strong energy-dissipating capacity, good ductility and no obvious strength degradation.Replaceable energy-dissipating hinges achieve that the damage and destruction of the prefabricated joint are concentrated on the replaceable energy-dissipating hinges, and the energy consumed by the energy-dissipating hinges accounts for more than 70% of the total dissipated energy in the prefabricated joint. The seismic performances of the replaceable energy-dissipating hinges in the two tests were similar, indicating that the seismic performance of the energy-dissipating hinges can be restored by replacing the damaged metal damper.