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中文摘要：
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.
英文摘要：
A new type of bidirectional energy dissipation steel damper was designed which was used with the bridge bearing .The damper dissipated the vibration energy through the elastic-plastic ben-ding deformation of the curved beam .First ,the simplified mechanic model of the damper was pro-posed ,and then the theoretical formulas of its main factor were discussed based on the simplified steel constitutive model .At last ,its finite element model was established ,and the mechanical performance was studied under the monotonic loading condition and the cycling loading condition .The results show that the w hole energy-dissipated part of the damper becomes plastic firstly ,and then the plastic de-formation concentrates in the middle part of it ,which is reasonable and is consistence with the desig-ner′s intention .The theoretical factors are similar with those through the finite element analysis ,so the formulas can effectively reflect the working performance of the damper .The hysteretic curve of the damper under the cycling loading condition is plump with a large initial stiffness ,thus ,the damper exhibits good energy dissipation performance .
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