屈曲约束折形叠合耗能器试验和模拟分析

在自复位结构中设置耗能器能够耗散地震能量、减轻结构构件的损伤,地震后更换耗能器即可快速恢复结构的抗震性能.文中提出一种采用高强螺栓装配到梁柱节点中的屈曲约束折形叠合耗能器,便于施工连接和震后更换.耗能器将节点的耗能集中在耗能芯板,通过附加约束装置防止芯板屈曲,同时耗能器能够作为梁翼缘的加强板以及节点的抗剪连接装置.对该耗能板进行轴向拉压试验,考察了其耗能能力、刚度、承载力和连接强度等,采用有限元软件ABAQUS进行模拟对比分析,结果表明,在保证连接装置强度的前提下,屈曲约束折形叠合耗能板具有较好的耗能能力和较高的刚度、承载力,能够作为装配到梁柱节点中的耗能装置.

The experiment and simulate study of buckling restrained L-shape superimposed steel damper

Applying the seismic energy dissipating damper in the self-centering structure can reduce the damage of the beam and column caused by the earthquake. The structure can be quickly restored by replacing the damaged dampers. We propose a new buckling restrained L-shape superimposed steel damper connecting with high-strength bolts which can dissipate the most seismic energy through the steel plate. The proposed damper can avoid the buckling of the steel plate through the additional restraining devices, and easily be replaced after earthquake. The flange of the beam end can be reinforced by the new damper, which also can be regarded as a shear transfer device. The consequences of the axial tension and compression test and ABAQUS simulation indicate that the proposed buckling restrained L-shape superimposed steel damper has essential capabilities of energy dissipation and good bearing and stiffness with the sufficient connecting strength.