薄钢板PEC柱-钢梁端板对拉螺栓连接滞回性能试验研究

HYSTERETIC BEHAVIOR STUDY ON CONNECTION OF PEC COLUMNS-STEEL BEAM WITH END PLATES AND PRETENSION HIGH-STRENGTH PENETRATING BOLTS

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 PEC column fabricated with thin-walled built-up section-steel beam connections with reduced cross sections, end plates and pretension high-strength penetrating bolts, the column layout and reduced cross-section location were taken as the design parameters, and 3 specimens were designed and fabricated by 1 ： 0.625 scale, which represented the middle joints. The test of the specimens was conducted under lateral cyclic loading in the column strong or weak axis, the test process was observed and the hysteretic curves were obtained. Based on the test results, the joints＇ global responses were analyzed, including the hysteretic behaviors, degradation of strength and flexural stiffness, energy-dissipation capacity, the ductility property and the failure mode. The conclusion showed that the specimens exhibited various degrees of self-centering functions, sound ductility and energy-dissipation capacity; the failure mode formed primary induced by yielding in the reduced cross-section or near the welding position of a steel beam. The study provides an experimental basis for amending the specification and engineering practice adopting the structure comprised of PEC columns-steel beams.