复合式金属型阻尼器的试验研究及数值仿真分析

EXPERIMENT STUDY AND NUMERICAL SIMULATION ANALYSIS OF METAL ALLOY BRACE

铅挤压型阻尼器初始刚度大,屈服强度高,耗能能力好,被广泛应用于结构减震控制中。然而由于研究者对铅金属力学性质的研究及模拟不足,常常导致数值模拟结果与试验结果存在不同程度的差异。对一种新型的铅-挤压型阻尼器(LED)——复合式金属型阻尼器(MAB)进行试验研究,采用DEFORM-3D软件对该型阻尼器进行较为系统地数值仿真分析。通过对比分析试验结果与数值仿真结果可知:复合式金属型阻尼器具有优良的耗能能力,且在大位移下具备良好的结构限位能力,挤压区域尺寸、轴突高度、轴突与阻尼器腔体间的间隙等参数显著影响其耗能能力;有限元仿真过程中,铅金属的力学模型的选择对仿真结果有显著影响,DEFORM-3D在金属耗能器仿真模拟中的应用效果良好。

Lead extrusion damper is widely used in the seismic control of structures for its large initial stiffness, high yield strength and good energy dissipation capacity. But as the lack of the research and analysis of the lead, there are more or less differences between the experiment results and the numerical simulation results of damper. A new style of lead extrusion damper was designed, called metal alloy brace （MAB）. According to the result of the experiment study and using the finite element software DEFORM - 3D some systemic research of this damper was done. Comparing and analyzing the experiment results and numerical simulation analysis results it concluded as follows： the MAB has an excellent energy dissipation capacity and can provide positive capacity when the structure meets larger earthquake; the size of the extrusion region, the height of the axon, the gap between axon and the cavity have significant effect on the energy dissipation capacity of the damper; during the analysis of the numerical simulation, the choice of mechanical model of lead has significant effect on the simulation result, and DEFORM - 3D can be widely used in the numerical simulation analysis of metallic damper.