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设计了一种新型桥梁支座双向耗能钢阻尼器,该阻尼器利用折角钢曲梁的弯曲弹塑性变形进行耗能.提出了该阻尼器简化力学模型,基于钢材简化本构模型推导了其耗能核心参数的理论公式,并通过有限元模拟研究其在单调加载及往复荷载作用下的力学性能.研究结果表明:钢阻尼器耗能段首先进入弹塑性,之后塑性变形集中于耗能段中部,受力合理,符合阻尼器设计意图;且理论公式与有限元计算结果相近,能有效地反应阻尼器的工作性能;在往复荷载作用下,其滞回曲线饱满,初始刚度大,耗能能力强.
A new type of bridge-supported bidirectional energy-dissipating steel damper is designed, which uses the bending elastic-plastic deformation of curved steel curved beam to dissipate energy. A simplified mechanical model of the damper is proposed. Based on the simplified constitutive model of steel, The theoretical formula of energy dissipation core parameters and the mechanical properties of the steel damper under monotonic loading and reciprocating loading are studied by means of finite element simulation.The results show that the energy dissipation section of steel damper firstly enters elasto-plasticity and then the plastic deformation concentrates on energy dissipation section The middle part is reasonable in force and conforms to the design intent of the damper. The theoretical formula and the finite element calculation result are similar, which can effectively reflect the working performance of the damper. Under the reciprocating load, the hysteresis curve is full, the initial stiffness is large, strong ability.