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设计参数对铅黏弹性连梁阻尼器力学性能分析 预览

Analysis of Mechanical Performance of Lead Viscoelastic Coupling Beam Damper by Design Parameters
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摘要 目的研究铅芯边距、铅芯直径、剪切钢板与约束钢板厚度比、复合黏弹性层中薄钢板与黏弹性层厚度比以及剪切模量对其力学性能的影响,给出各设计参数的建议值.方法采用ABAQUS软件建立铅黏弹性连梁阻尼器的有限元模型;然后对15组铅黏弹性连梁阻尼器进行参数分析,研究不同设计参数对铅黏弹性连梁阻尼器力学性能的影响规律;最后给出各设计参数的取值建议.结果铅黏弹性连梁阻尼器滞回曲线饱满,表现出良好的耗能能力.各设计参数对铅黏弹性连梁阻尼器力学性能具有不同程度的影响,铅芯直径显著影响屈服荷载、屈服位移、最大阻尼力和等效黏滞阻尼比,对屈服后刚度具有较大影响;铅芯边距和剪切钢板与约束钢板厚度比主要影响屈服位移,而铅芯直径、剪切模量主要影响屈服后刚度;薄钢板与黏弹性层厚度比和钢材类型对力学性能影响较小.结论铅芯宜对称布置在复合黏弹性层外侧,铅芯边距取1~1. 5倍的铅芯直径;铅黏弹性连梁阻尼器需求的屈服承载力可由铅芯直径大小确定;剪切钢板与约束钢板厚度比取1. 00~2. 00,且剪切钢板厚度宜取0. 8倍的复合黏弹性层厚度;薄钢板与黏弹性层厚度比取0. 4~0. 8,且优先取较小值;宜选用低硬度的黏弹性材料和强度高的钢材以保证阻尼器正常工作,发挥其稳定的耗能能力. This paper studied the influence of the lead viscoelastic coupling beam damper ’s( LVCBD) mechanical performance caused by different parameters,including the distance between lead core’s center and outside edge of the composited viscoelastic layer,lead core diameter,thick-ness ratio of shear plate to constrained plate,thickness ratio of thin plate to viscoelastic layer in the composited viscoelastic layer and shear modulus,which provides the suggested values of the design parameters. 15 groups of LVCBD models with different parameters are established and analyzed through finite element software called ABAQUS. The results showthat: The hysteretic curve of LVCBD is full,showing a good energy dissipation capacity. The design parameters have different effects on mechanical performance of LVCBD,The lead diameter has significant influence on LVCBD’s yield force,yield displacement,maximum damping force and equivalent viscous damping ratio,and also affects the post-yield stiffness;yield displacement is mainly affected by the distance between lead core’s center and outside edge of the composited viscoelastic layer and the thickness ratio of shear plate to constrained plate,while the lead diameter and shear modulus mainly affect the post-yield stiffness;the thickness ratio of thin plate to viscoelastic layer and steel type slightly affect LVCBD ’s mechanical performance. The conclusion is as follows: the lead core should be symmetrically arranged on the outside of the composited viscoelastic layer and the distance should be 1 ~ 1. 5 times of lead core diameter;the lead core diameter should be determine by requirements of the LVCBD ’s yield capacity;the thickness ratio of shear plate to constrained plate should be1. 00 ~ 2. 00,and the thickness of shear plate should be 0. 8 times of the thickness of the composited viscoelastic layer;the thickness ratio of thin plate to viscoelastic layer should be 0. 4 ~ 0. 8 and the smaller value should be taken priority;viscoelastic material with lowhardness and higher strengt
作者 房晓俊 周云 FANG Xiaojun;ZHOU Yun(Department of Civil Engineering,Guangzhou University,Guangzhou,China,510006)
出处 《沈阳建筑大学学报:自然科学版》 CAS CSCD 北大核心 2019年第1期1-11,共11页 JOURNAL OF SHENYANG JIANZHU UNIVERSITY NATURAL SCIENCE
基金 国家重点研发计划重点专项(2017YFC0703608).
关键词 功能自恢复 铅黏弹性连梁阻尼器 力学性能 设计参数 self-resilient lead viscoelastic coupling beam damper mechanic performance design parameter
作者简介 房晓俊(1993—),男,博士研究生,主要从事结构减震控制方面研究.
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