Mechanical model and damping control of improved lead shear dampers with long stroke

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (16) : 177-184.

WANG Baoshun,YAN Weiming,HE Haoxiang

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Abstract

The large deformation capacity of a traditional lead shear damper is insufficient, and undesirable phenomena such as low damping efficiency and poor stability may occur.Based on the design scheme of the normal lead shear damper with long stroke (LSD-LS), the construction and design method of an improved plate lead shear damper with long stroke (ILSD-LS) was proposed.Based on the ideal rigid-plastic constitutive law of lead, a mechanical model of the ILSD-LS was established.Compared to LSD-LS, ILSD-LS has better damping force, energy dissipation capacity and stability according to the results of simulation and experiments, and the method of calculating damping force is more reasonable and accurate.The nonlinear time history analysis of a typical high-rise structure with ILSD-LS was carried out by considering the characteristics of ordinary ground motion and long period ground motion.Numerical results indicate that seismic response of a high-rise structure with ILSD-LS is significantly reduced even when subjected to long period ground motion.

Key words

lead shear damper / damping control / long stroke / elastic-plastic analysis / long period ground motion

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WANG Baoshun,YAN Weiming,HE Haoxiang. Mechanical model and damping control of improved lead shear dampers with long stroke[J]. Journal of Vibration and Shock, 2018, 37(16): 177-184

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