Analysis on the shear mechanical properties of a LYP225 low yield point steel web hourglass pin damper

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (10) : 268-278.

LIAN Ming1,2, DAI Baihao1, LI Wei1

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Abstract

In order to study the hysteresis and fatigue performance of LYP225 low yield point steel web hourglass pin damper (LYP-WHP) under shear loading, two LYP-WHP specimens were tested for hysteresis loading and fatigue loading respectively. Based on the experimental results, a Chaboche combined hardening model was used to establish 12 finite element models of LYP-WHP by ABAQUS, with the inner diameter, outer diameter and length of energy dissipation section of the damper as parameters, respectively, to study the influence law of the above parameters on the hysteresis performance of LYP-WHP under shear loading. The formula for calculating the elastic stiffness of LYP-WHP is derived, and a preliminary method for determining the yield force and yield displacement of LYP-WHP is given, and based on the results of experimental and numerical analysis, the proposed value of the stiffness discount factor of LYP-WHP after yielding is obtained. The research results show that LYP-WHP has good hysteresis and fatigue properties under shear displacement; Increasing the outer and inner diameters can significantly improve the load carrying capacity, stiffness and energy dissipation capacity of LYP-WHP, while increasing the length of the energy dissipation section will reduce the load carrying capacity, stiffness and energy dissipation capacity of LYP-WHP; Increasing the inner diameter and outer diameter makes the utilization of the material first increase and then decrease, and increasing the length of the energy-consuming section has little effect; the derived formula for calculating the elastic stiffness of LYP-WHP can calculate the elastic stiffness of LYP-WHP accurately; Based on the analysis results of this paper, it is suggested that the inner diameter to outer diameter ratio of LYP-WHP is taken as 0.375~0.625 and the stiffness reduction factor after yielding is taken as 0.11; the Bi-linearl skeleton curve is obtained.

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Low yield point steel / Web hourglass pin damper / Parameter analysis / Hysteresis performance / Fatigue performanc

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LIAN Ming1,2, DAI Baihao1, LI Wei1. Analysis on the shear mechanical properties of a LYP225 low yield point steel web hourglass pin damper[J]. Journal of Vibration and Shock, 2024, 43(10): 268-278

References

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