转动摩擦铰阻尼器力学性能试验研究

EXPERIMENTAL INVESTIGATION ON MECHANICAL PERFORMANCE OF ROTATIONAL FRICTION HINGE DAMPER

  • 摘要: 在装配式框架梁-柱节点中设置消能减震装置,是装配式结构发展的重要方向。转动摩擦铰阻尼器(RFHD)是转动摩擦耗能干式装配梁-柱节点(DRFDBJ)的关键单元,为梁-柱节点提供可调控的承载力和耗能能力。为了验证RFHD的力学性能,优选适用于RFHD的摩擦片材料,综合考虑了H62黄铜和纤维增强树脂基材料2种摩擦片材料、3个螺栓预紧力水准和3种加载制度,开展了18个工况下的RFHD力学性能试验,考察了RFHD的出力、摩擦系数和疲劳受力性能,重点分析了两种材料的摩擦系数稳定性。结果表明:采用两种摩擦片时,RFHD均具有相对稳定的出力、良好的耗能和变形能力,且疲劳性能满足相关规范要求;RFHD可作为DRFDBJ的关键单元提供节点的承载力和耗能能力;相比于H62黄铜摩擦片,纤维增强树脂基摩擦片在不同加载速率和不同压应力水准下的摩擦系数更稳定,有利于实现RFHD出力的稳定可调,进而实现DRFDBJ力学性能的可调控。该研究可为DRFDBJ节点的进一步研究奠定基础,并为摩擦阻尼器的相关研究提供参考。

     

    Abstract: Adopting energy dissipation device into the precast concrete beam-to-column joint is an important direction in the development of precast structures. Rotational friction hinge damper (RFHD) is the critical component of the dry-connected rotational friction dissipative beam-to-column joint (DRFDBJ), which provides adjustable bending moment strength and energy dissipation capacity for the DRFDBJ. For verifying the mechanical performance of a RFHD and selecting the friction pad material suitable for the RFHD, experimental studies of 18 load cases are conducted by considering 2 types of friction materials (H62 brass and fiber reinforced resin-based material), 3 levels of pretension force of the bolt, and 3 types of loading protocols. The strength, friction coefficient and fatigue performance of the RFHD are investigated, and the stability of the friction coefficient of the two materials are specifically focused and compared. The results indicate that the RFHD could be adopted as the critical component of a DRFDBJ for providing the strength and energy dissipation capacity of the joint. By using either one of the two types of friction pads, the RFHD exhibit relatively stable strength, desirable energy dissipation capacity and deformation capacity, and the fatigue performance of the RFHD could meet the requirements of the codes. In addition, compared with H62 brass friction pad, fiber reinforced resin-based friction pad exhibit relatively more stable friction coefficient under different levels of loading rates and different levels of pretension forces of the bolt, which is conducive for the stable and adjustable strength of the RFHD, and thus achieving adjustable performance of a DRFDBJ. The research outcome will provide a basis for further investigation on the DRFDBJ and a useful reference for relative study on friction dampers.

     

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