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Steel and Composite Structures
  Volume 36, Number 4, August25 2020 , pages 447-462
DOI: https://doi.org/10.12989/scs.2020.36.4.447
 


Influence of stiffeners on the performance of blind-bolt end-plate connections to CFST columns
Fa-xing Ding, Zhi-cheng Pan, Peng Liu, Shi-jian Huang, Liang Luo and Tao Zhang

 
Abstract
    The paper aims to investigate the mechanical mechanism and seismic effect of stiffeners in blind bolt endplate connection to CFST column. A precise 3D finite element model with considering the cyclic properties of concrete and steel materials was established, and the efficiency was validated through monotonic and cyclic test data. The deforming pattern and the seismic performance of the unstiffened and stiffened blind bolt endplate connections were investigated. Then a parametric analysis was conducted to analyze the contribution of stiffeners and the joint working behaviors with endplate under cyclic load. The joint stiffness classifications were compared and a supplement stiffness classification method was proposed, and the energy dissipation ability of different class connections were compared and discussed. Results indicated that the main deformation pattern of unstiffened blind bolt endplate connections was the local bending of end plate. The vertical stiffeners can effectively alleviate the local bending deformation of end plate. And influence of stiffeners in thin endplate and thick endplate was different. Based on the stiffness of external diaphragm welded connection, a more detailed rigidity classification was proposed which included the pin, semi-rigid, quasi-rigid and rigid connection. Beam was the main energy dissipation source for rigid connection. For the semi-rigid and quasi-rigid connection, the extended endplate, stiffeners and steel beam would all participate in the energy dissipation.
 
Key Words
    concrete filled steel tube (CFST); endplate connections; high-strength blind bolts; finite element (FE) analysis; energy dissipation; rigidity classification
 
Address
Fa-xing Ding and Peng Liu: School of Civil Engineering, Central South University, Changsha, Hunan Province, 410075, PR China;
Engineering Technology Research Center for Prefabricated Construction Industrialization of Hunan Province, 410075, PR China
Zhi-cheng Pan and Shi-jian Huang: School of Civil Engineering, Central South University, Changsha, Hunan Province, 410075, PR China
Liang Luo: School of Civil Engineering and Architecture, Nanchang Hangkong University, Nanchang, Jiangxi Province, 330036, PR China
Tao Zhang: School of Civil Architecture, Zhengzhou University of Aeronautics, Zhengzhou, Henan Province, 450000, PR China
 

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