|Table of Contents|

Theoretical Calculation and Numerical Simulation of Shear Stiffness of Mild Steel Dampers(PDF)

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

Issue:
2022年06期
Page:
55-63
Research Field:
结构工程
Publishing date:

Info

Title:
Theoretical Calculation and Numerical Simulation of Shear Stiffness of Mild Steel Dampers
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)
Keywords:
mild steel damper;  elastic shear stiffness;  stiffness degradation;  theoretical calculation;  numerical simulation
PACS:
TU352
DOI:
10.19815/j.jace.2021.09048
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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Last Update: 2022-12-20