LYP225低屈服点钢锥形钢棒阻尼器剪切力学性能研究  

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

作　　者：连鸣[1,2] 戴柏豪 李伟 LIAN Ming;DAI Baihao;LI Wei(School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Key Lab of Structural Engineering and Earthquake Resistance,Ministry of Education,Xi’an University of Architecture and Technology,Xi’an 710055,China)

机构地区：[1]西安建筑科技大学土木工程学院,西安710055 [2]西安建筑科技大学结构工程与抗震教育部重点实验室,西安710055

出　　处：《振动与冲击》2024年第10期268-278,共11页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(52078411);陕西省创新能力支撑计划-青年科技新星项目(2022KJXX-47);陕西省教育厅青年创新团队科研计划项目(22JP041)。

摘　　要：为了研究LYP225低屈服点钢锥形钢棒阻尼器(low yield point-web hourglass pin, LYP-WHP)在剪切荷载作用下的滞回性能与疲劳性能,对两个LYP-WHP试件分别进行了滞回加载与疲劳加载试验。基于试验结果,采用混合强化本构模型,通过ABAQUS软件建立了12个LYP-WHP的足尺精细化数值模型,分别以阻尼器的内径、外径和耗能段长度为参数,研究以上参数对LYP-WHP在剪切荷载作用下LYP-WHP滞回性能的影响规律,推导了LYP-WHP的弹性刚度计算公式,并给出了初步确定LYP-WHP屈服力与屈服位移的方法,基于试验与数值分析结果,得到了LYP-WHP屈服后的刚度折减系数建议值。研究结果表明:在剪切位移下,LYP-WHP具有良好的滞回性能与疲劳性能;增大外径和内径可明显提高LYP-WHP的承载力、刚度和耗能能力,增大耗能段长度则会降低LYP-WHP的承载力、刚度和耗能能力;增大内径、外径使材料的利用率先增大后减小,增大耗能段长度则基本无影响;推导的LYP-WHP弹性刚度计算式可以较为准确地计算LYP-WHP的弹性刚度;基于该研究的分析结果,建议LYP-WHP的内径与外径比值取0.375~0.625,屈服后的刚度折减系数取0.11,得到了理论骨架曲线的计算式。In order to study the hysteresis and fatigue performance of a LYP225 low yield point-web hourglass pin(LYPWHP)damper under shear loading,two LYP-WHP specimens were tested under hysteresis loading and fatigue loading respectively.Based on the experimental results,a Chaboche combinedly hardening model was used to establish 12 finite element models of the 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 influences of the above parameters on the hysteresis performance of the LYP-WHP under shear loading.The formula for calculating the elastic stiffness of the LYP-WHP was derived,and a preliminary method for determining the yield force and yield displacement of the LYP-WHP was given.Based on the results of experimental and numerical analysis,the proposed value of the stiffness discount factor of the LYP-WHP after yielding was presented.The research results show that the 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 the LYP-WHP,while increasing the length of the energy dissipation section will reduce its load carrying capacity,stiffness and energy dissipation capacity.Increasing the inner diameter and outer diameter makes the utilization rate of the material first increase and then decrease,and increasing the length of the energy-consuming section has little effect.The derived formula can calculate the elastic stiffness of the LYP-WHP accurately.Based on the analysis results,it is suggested that the ratio of the inner diameter to outer diameter of the LYP-WHP is taken as 0.375~0.625 and the stiffness reduction factor after yielding is taken as 0.11 and the bi-linear skeleton curve is then obtained accordingly.

关 键 词：低屈服点钢(LYP) 锥形钢棒阻尼器(WHP) 参数分析 滞回性能 疲劳性能 

分 类 号：TH212[机械工程—机械制造及自动化] TH213.3