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Steel and Composite Structures
  Volume 38, Number 5, March10 2021 , pages 497-521
DOI: https://doi.org/10.12989/scs.2021.38.5.497
 


Fully nonlinear inelastic analysis of rectangular CFST frames with semi-rigid connections
Van-Tuong Bui, Quang-Viet Vu, Viet-Hung Truong and Seung-Eock Kim

 
Abstract
    In this study, an effective numerical method is introduced for nonlinear inelastic analyses of rectangular concrete-filled steel tubular (CFST) frames for the first time. A steel-concrete composite fiber beam-column element model is developed that considers material, and geometric nonlinearities, and residual stresses. This is achieved by using stability functions combined with integration points along the element length to capture the spread of plasticity over the composite cross-section along the element length. Additionally, a multi-spring element with a zero-length is employed to model the nonlinear semi-rigid beam-to-column connections in CFST frame models. To solve the nonlinear equilibrium equations, the generalized displacement control algorithm is adopted. The accuracy of the proposed method is firstly verified by a large number of experiments of CFST members subjected to various loading conditions. Subsequently, the proposed method is applied to investigate the nonlinear inelastic behavior of rectangular CFST frames with fully rigid, semi-rigid, and hinged connections. The accuracy of the predicted results and the efficiency pertaining to the computation time of the proposed method are demonstrated in comparison with the ABAQUS software. The proposed numerical method may be efficiently utilized in practical designs for advanced analysis of the rectangular CFST structures.
 
Key Words
    nonlinear analysis; fiber beam-column element; concrete-filled steel tubes; stability function; semi-rigid connections
 
Address
Van-Tuong Bui and Seung-Eock Kim: Department of Civil and Environmental Engineering, Sejong University, 98 Gunja-dong, Gwangjin-gu, Seoul, 05006, South Korea
Quang-Viet Vu: Institute of Research and Development, Duy Tan University, Danang 550000, Viet Nam
Viet-Hung Truong: Department of Civil Engineering, Thuyloi University, 175 Tay Son, Dong Da, Ha Noi, Viet Nam
 

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