复杂受力状态下铅黏弹性连梁阻尼器性能研究

Performance of lead viscoelastic coupling beam damper under complex loading condition

铅黏弹性连梁阻尼器在实际工程应用中受到剪力、轴力、弯矩及其组合等复杂作用。采用ABAQUS有限元软件对复杂受力状态下铅黏弹性连梁阻尼器的性能进行分析,结果表明:纯剪切受力与复杂受力条件下,铅黏弹性连梁阻尼器的滞回曲线基本重合,最大阻尼力和等效黏滞阻尼比基本不变,不影响阻尼器的耗能和应力分布;轴力作用对铅黏弹性连梁阻尼器的力学性能影响不大,可忽略其影响;弯矩作用主要影响铅黏弹性连梁阻尼器的屈服位移和屈服荷载,其中正向弯矩作用能够促使铅黏弹性连梁阻尼器提前进入屈服耗能,负向弯矩作用则延迟阻尼器的屈服。

The lead viscoelastic coupling beam damper(LVCBD) effectively works under complex loading condition in engineering application, including shear force, axial force, bending moment or their combined loads. Thus, the performance of LVCBD under complex loading condition has been studied through finite element software ABAQUS. The results indicate that under the single shearing condition and complex loading condition, the hysteresis curves of LVCBD agree well, the maximum damping force and equivalent viscous damping ratio are basically identical, and the complex loading cases have little impact on the energy dissipation and stress distribution of LVCBD compared with the single shearing case. The axial force has small influence on the mechanical performance of LVCBD, which can be nearly ignored. The bending moment mainly affects the yield displacement and yield force of LVCBD, and the positive bending moment can cause the LVCBD to yield in advance and the negative bending moment behaves on the contrary.