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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

39卷

期数:

2022年06期

页码:

55-63

栏目:

结构工程

出版日期:

2022-11-30

文章信息/Info

Title:

Theoretical Calculation and Numerical Simulation of Shear Stiffness of Mild Steel Dampers

文章编号:

1673-2049(2022)06-0055-09

作者:

梁书亭¹,周 政¹,朱筱俊²

(1. 东南大学 土木工程学院,江苏 南京 211189; 2. 东南大学建筑设计研究院有限公司,江苏 南京 210096)

Author(s):

LIANG Shu-ting¹, ZHOU Zheng¹, ZHU Xiao-jun²

(1.School of Civil Engineering, Southeast University, Nanjing 211189, Jiangsu, China; 2. Architects & Engineers Co., Ltd of Southeast University, Nanjing 210096, Jiangsu, China)

关键词:

软钢阻尼器;  弹性剪切刚度;  刚度退化;  理论计算;  数值模拟

Keywords:

mild steel damper;  elastic shear stiffness;  stiffness degradation;  theoretical calculation;  numerical simulation

分类号:

TU352

DOI:

10.19815/j.jace.2021.09048

文献标志码:

A

摘要:

提出一种考虑剪切变形的深梁模型和开孔板软钢阻尼器的截面简化方式,在此基础上推导出弹性剪切刚度的理论计算公式; 考虑不同开孔率及钢板厚度,采用ABAQUS通用有限元软件对开圆孔、椭圆孔、弧形边3种开孔形式的23组软钢阻尼器试件进行数值模拟,并与理论计算结果对比; 探讨了平面内双向开孔率、钢板厚度对软钢阻尼器弹塑性阶段剪切刚度退化的影响。结果表明:理论推导结果与数值模拟结果吻合良好,其中15组试件计算相对误差在10%以内,最大相对误差为23%,平均相对误差为7.5%,说明提出的计算模型与简化方法比较合理; 在开孔板软钢阻尼器受剪切作用的弹塑性阶段,通过数值模拟发现,随着垂直于受力方向开孔率的增大,构件的剪切刚度退化速度呈下降趋势,即受力过程中瞬时刚度与初始刚度的比值整体上与垂直于受力方向的开孔率呈正相关; 随着平行于受力方向开孔率的增大,试件剪切刚度的退化速度呈先下降后上升趋势; 钢板厚度对剪切刚度退化速度的扰动较小,厚度越大,构件剪切刚度退化速度略有降低。

Abstract:

A deep beam model considering shear deformation and a simplified section method of perforated plate mild steel damper were proposed. On the basis, the theoretical calculation formula of elastic shear stiffness was derived. Considering different opening ratios and steel plate thicknesses, the ABAQUS general finite element software was used to conduct numerical simulation on 23 groups of mild steel damper specimens with three types of opening, namely, circular opening, elliptical opening and arc edge opening, and the results were compared with the theoretical calculation results. The influence of two-way opening ratio and steel plate thickness on shear stiffness degradation of mild steel damper in elastic-plastic stage was discussed. The results show that the theoretical derivation results are in good agreement with the numerical simulation results. The calculation relative error of 15 groups of specimens is within 10%, the maximum relative error is 23%, and the average relative error is 7.5%, indicating that the proposed calculation model and simplified method are reasonable. In the elastic-plastic stage of perforated plate mild steel damper under shear action, it is found through numerical simulation that the shear stiffness degradation rate of the member decreases with the increase of the opening ratio perpendicular to the force direction, which means the ratio of the instantaneous stiffness to the initial stiffness is positively correlated with the opening ratio perpendicular to the force direction. With the increase of the opening ratio parallel to the force direction, the degradation rate of the shear stiffness of the specimen decreases firstly and then increases. The thickness of steel plate has little influence on the shear stiffness degradation rate. The greater the thickness is, the lower the shear stiffness degradation rate is.

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相似文献/References:

[1]韩建强,丁祖贤,张玉敏.消能减震及软钢阻尼器的研究与应用综述[J].建筑科学与工程学报,2018,35(05):60.
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备注/Memo

备注/Memo:

收稿日期:2021-09-07
基金项目:国家自然科学基金项目(51778214)
作者简介:梁书亭(1964-),男,河南禹州人,教授,博士研究生导师,工学博士,E-mail:stliang@seu.edu.cn。通信作者:周 政(1996-),男,江苏泰州人,工学硕士研究生,E-mail:zz863402804@163.com。

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更新日期/Last Update: 2022-12-20