Sensitivity analysis of geometrical design parameters on the compressive strength of the vertical inner-plate reinforced square hollow section T-joints: A finite element study

•The axial compressive behavior of VIPS SHS T-joints is extensively studied by experimentally validated FEA.•The sequence and effect of key parameters are identified quantitatively.•The control failure mode for VIPS SHS T-joints under compression is identified.•The yield lines on the chord flange ar...

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Bibliographic Details
Published in:Engineering structures 2020-04, Vol.208, p.110308, Article 110308
Main Authors: Chang, Hongfei, Zuo, Wenkang, Xia, Junwu, Xu, Bo, Ma, Renwei, Zhang, Lihai
Format: Article
Language:English
Subjects:
Axial compressive strength
Compressive strength
Design
Design parameters
Empirical equations
Finite element analysis
Finite element method
Hollow sections
Parameter identification
Parameter sensitivity
Sensitivity analysis
Square hollow section
T-joints
Tee joints
Thickness ratio
Vertical inner plate
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Summary:•The axial compressive behavior of VIPS SHS T-joints is extensively studied by experimentally validated FEA.•The sequence and effect of key parameters are identified quantitatively.•The control failure mode for VIPS SHS T-joints under compression is identified.•The yield lines on the chord flange are clarified and an empirical model is proposed. In present study, the normalized axial compressive strength (Qu) of the vertical inner-plate reinforced (VIPR) square hollow section (SHS) T-joints was systematically investigated under various geometrical design parameters of the joint, such as width ratio of the brace and the chord (β), thickness ratio of the vertical inner plate and chord flange (τip), ratio of the outstretch length of the vertical inner plate from the brace to the width of the chord (γip), height and width ratio of the brace (η1). First, a finite element (FE) model of the VIPR SHS T-joint was developed and validated by using experimental data. Then, a large scale of parametric studies was carried out to identify the critical geometrical design parameters that influence the Qu of the VIPR SHS T-joint. The results show that Qu increases with the increase of β, and the rate of increase becomes more obvious under a large β. In addition, under a relatively small β (i.e. β 
ISSN:0141-0296
1873-7323
DOI:10.1016/j.engstruct.2020.110308