加装SLVD的预制装配式混凝土消能减震框架抗震性能分析

Seismic Performance of Precast Concrete Energy-dissipationFrame Structures with Sector Lead Viscoelastic Damper

摘要:

为研究扇形铅黏弹阻尼器（SLVD）对预制装配式混凝土（PC）框架抗震性能的提升效果和其设计参数对PC框架抗震性能的影响规律，建立Abaqus精细化有限元模型，与试验结果对比验证模型正确性。对比加装SLVD的PC消能框架与RC框架抗震性能的差异，分析不同铅芯直径、橡胶硬度和扇形半径三个关键设计参数对PC消能框架抗震性能的影响。研究结果表明：SLVD在PC消能框架中起"耗能腋撑"作用；铅芯直径对整体结构抗震性能影响较大，随铅芯直径增大，结构刚度、承载能力和耗能能力均有所提高；橡胶硬度对整体结构抗震性能影响较小；铅芯屈服区域随扇形半径增大而减小，但可提高整体结构的承载能力。

Abstract:

To further study the effect of the sector lead viscoelastic damper (SLVD) and the influence of its design parameters on the seismic performance of the energy-dissipation frame of precast concrete (PC), a refined Abaqus finite element model was established. The Abaqus model was validated by comparison with the experimental results. The differences in seismic performances between the PC energy-dissipation frame with SLVD and ordinary reinforced concrete frame were studied. Then, the influences of the key design parameters of SLVD-i.e., the lead diameter, rubber hardness, and fan radius-on the seismic performance of the PC energy-dissipation frame were analyzed. The results show that the SLVD plays a role of energy-dissipation haunch brace in the PC energy-dissipation frame. The bearing capacity, structural stiffness, and the energy-dissipation capacity will increase with the increase of the lead diameter, and this has a great influence on the seismic performance of PC energy-dissipation frames. The rubber hardness has little effect on the seismic performance of the structure. Moreover, with the increase of the fan radius, the bearing capacity and stiffness of the overall structure will be enhanced; however, the yield area of the lead will decrease.