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Formulation of stress concentration factors for concrete-filled steel tubular (CFST) T-joints under axial force in the brace

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タイトル: Formulation of stress concentration factors for concrete-filled steel tubular (CFST) T-joints under axial force in the brace
著者: Zheng, Jian / Nakamura, Shozo / Ge, Yajing / Chen, Kangming / Wu, Qingxiong
発行日: 2018年 9月 1日
出版者: Elsevier Ltd.
引用: Engineering Structures, 170, pp.103-117; 2018
抄録: CFST T-joints consisting of a concrete-filled circular chord and a circular hollow section brace have been used in CFST trussed arch bridges. The stress concentration factors (SCFs) of CFST T-joints have been found to be much lower than those of circular hollow section (CHS) T-joints in the existing researches. At present, no parametric formulae have been proposed for SCFs determination for fatigue design of CFST T-joints. In this study, three-dimensional finite element (FE) models of the existing experiments for CFST T-joints were developed to determine the SCFs distribution at the chord-brace intersection under axial force in the brace. After confirming the validity of the FE models by the comparison of calculated SCFs with existing experimental results, they were provided for the parametric analysis to reveal the influence of four non-dimensional parameters, i.e. diameter ratio (β), diameter to thickness ratio of chord (2γ), thickness ratio (τ) and relative chord length (α), on SCFs of CFST T-joints. In total, 212 FE models with different parameters were analyzed under tensile and compressive axial forces. Based on the results of parametric analysis, a series of parametric formulae to calculate the SCFs was proposed for CFST T-joints referring to those for CHS T-joints. The SCFs determined by the formulae showed good agreements with FE analysis results.
キーワード: CFST T-joints / Fatigue / Finite element analysis / Hot spot stress / Parametric formulae / Stress concentration factors
URI: http://hdl.handle.net/10069/38530
ISSN: 01410296
DOI: 10.1016/j.engstruct.2018.05.066
権利: © 2018 Elsevier Ltd. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
資料タイプ: Journal Article
原稿種類: author
出現コレクション:060 学術雑誌論文

引用URI : http://hdl.handle.net/10069/38530



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