摩擦-承压型耗能连接梁柱节点抗震性能试验研究

EXPERIMENTAL STUDY ON THE SEISMIC BEHAVIOR OF BEAM-COLUMN JOINT WITH FRICTION-BEARING ENERGY-DISSIPATION CONNECTION

  • 摘要: 为提高装配式钢结构大震下的变形能力和耗能能力,实现损伤集中可控,提出一种摩擦-承压型耗能连接梁柱节点,由带悬臂梁的钢柱、钢梁、翼缘滑移耗能元件、腹板钢制铰及高强螺栓群组成。设计了5个摩擦-承压型耗能连接梁柱节点试件和1个单盖板拼接梁柱节点试件,通过低周往复加载试验,分析各试件的破坏模态、承载能力、荷载-位移曲线、耗能能力和塑性转动能力等抗震性能指标。结果表明:摩擦-承压型耗能连接梁柱节点出现明显的滑移行为,翼缘滑移耗能元件产生一定的弯曲残余变形,单盖板拼接梁柱节点试件则出现明显的局部屈曲。摩擦-承压型耗能连接梁柱节点的承载力低于单盖板拼接梁柱节点,但具有较为稳定的力学性能,且耗能能力和延性均优于单盖板拼接梁柱节点;其塑性转角均大于0.044 rad,符合高韧性结构中连接的最小转角要求。滑移长度明显影响摩擦-承压型耗能连接梁柱节点的破坏形式,当滑移长度较小时,较大变形下滑移耗能板发生断裂导致梁柱节点失效;增加滑移耗能板的宽度一定程度上可提高梁柱节点的承载力和耗能能力;增加滑移耗能板的滑移长度有利于提高梁柱节点的延性性能和耗能能力,但对承载力影响不大。

     

    Abstract: To improve the deformation capacity and energy dissipation capacity of prefabricated steel structures under large earthquakes, and to achieve damage control, proposed is a new type of beam-column joint with friction-bearing energy-dissipation connection (JFBEC). The JFBEC composes a steel column welded with a cantilever steel beam, independent steel beam, flange energy-dissipation element, web steel hinge, and high-strength bolts. A total of 5 beam-column joints with friction-bearing energy-dissipation connection and one beam-column joint with a single flange cover plate (JSFCP) were designed and tested under cyclic loading. Studied are the failure mode, bearing capacity, load-displacement behavior, energy dissipation and rotational behavior. The study results demonstrate that JFBEC exhibited an evident sliding behavior, with bending residual deformation in the flange energy-dissipation element. However, the JSFCP failed with obvious local buckling. The bearing capacity of JFBEC was smaller than that of JSFCP, while the JFBEC developed a more stable mechanical behavior, with more excellent energy dissipation capacity and ductility. The plastic rotation of JFBEC exceeds 0.044 rad, satisfying the requirements for a high-ductile connection. The slipping distance in the flange energy-dissipation element greatly affects the failure mode, and the fracture of the sliding plate might occur with a shorter slotted hole and lead to the failure of the proposed joint. With the width of sliding plate increasing, the bearing capacity and energy dissipation was enhanced. The increase of the slipping distance was beneficial for the ductility behavior and the energy dissipation capacity, but it had little effect on the bearing capacity.

     

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