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Steel and Composite Structures
  Volume 32, Number 4, August25 2019 , pages 497-507
DOI: https://doi.org/10.12989/scs.2019.32.4.497
 


Rotational behavior of exposed column bases with different base plate thickness
Yao Cui, Fengzhi Wang, Hao Li and Satoshi Yamada

 
Abstract
    Exposed column base connections are used in low- to mid-rise steel moment resisting frames. This paper is to investigate the effect of the base plate thickness on the exposed column base connection strength, stiffness, and energy dissipation. Five specimens with different base plate thickness were numerically modelled using ABAQUS software. The numerical model is able to reproduce the key characteristics of the experimental response. Based on the numerical analysis, the critical base plate thickness to identify the base plate and anchor rod yield mechanism is proposed. For the connection with base plate yield mechanism, the resisting moment is carried by the flexural bending of the base plate. Yield lines in the base plate on the tension side and compression side are illustrated, respectively. This type of connection exhibits a relatively large energy dissipation. For the connection with anchor rod yield mechanism, the moment is resisted through a combination of bearing stresses of concrete foundation on the compression side and tensile forces in the anchor rods on the tension side. This type of connection exhibits self-centering behavior and shows higher initial stiffness and bending strength. In addition, the methods to predict the moment resistance of the connection with different yield mechanisms are presented. And the evaluated moment resistances agree well with the values obtained from the FEM model.
 
Key Words
    exposed column base; base plate thickness; anchor rod yield mechanism; base plate yield mechanism; finite element analysis
 
Address
(1) Yao Cui:
State Key Laboratory of Coastal and Offshore Engineering, Faculty of Infrastructure Engineering, Dalian University of Technology, No. 2 Linggong-road, Dalian 116024, P.R. China;
(2) Fengzhi Wang, Hao Li:
School of Civil Engineering, Faculty of Infrastructure Engineering, Dalian University of Technology, No. 2 Linggong-road, Dalian 116024, P.R. China;
(3) Satoshi Yamada:
Institute of Innovative Research, Tokyo Institute of Technology, J2-21, Tokyo Institute of Technology, 4259 Nagatsuda, Midori-ku, Yokohama, Japan.
 

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