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薄钢板组合截面PEC柱-钢梁连接中节点,采取工字梁端截面削弱、端板与预拉对穿高强螺栓的连接方式,考虑组合柱布置与梁削弱截面位置变化作为设计参数,对3个PEC柱-削弱梁、短端板对穿螺栓连接中节点1∶0.625缩尺模型进行低周反复荷载下的滞回性能试验。观察各个试件试验中的破坏过程,通过实测数据分析,得到了该类框架连接节点的滞回性能、强度与转动刚度退化、延性与耗能能力和破坏模式。结果表明:由于预拉对穿螺栓的设置,所有试件均表现出不同程度的自复位效果和良好的转动与耗能能力;节点的破坏模式为钢梁削弱截面或连接部位附近截面屈服。研究进一步丰富了PEC柱-钢梁连接的研究成果,为PEC柱-钢梁组合结构设计规范的制订和工程应用提供了理论依据。
The connection between the end plate and the prestressing on the high-strength bolts is taken as the connecting point between the PEC-steel beam and the mid-point of the PEC column-steel beam. Taking the combination column arrangement and the position change of the weakened section as the design parameters, PEC columns - weakened the hysteretic performance test of the 1: 0.625 scale model of the bolt and the short end plate to the node in the bolted connection under the low-cycle repeated load. The failure process of each specimen was observed. The hysteretic behavior, strength and rotational stiffness degradation, ductility and energy dissipation capacity and failure modes of the joints were obtained by the measured data analysis. The results show that all the specimens show different degrees of self-resetting effect and good rotation and energy dissipation capacity due to the pre-tensioned bolt installation. The failure mode of the joints is yielding of the weakening section of the steel beam or the section near the connecting section. The research further enriched the research results of PEC column-steel beam connection, which provides a theoretical basis for the design and engineering application of PEC column-steel beam composite structure design.