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Effects of chord pre-load on strength of CHS X-joints stiffened with external ring stiffeners and gusset plates
Highlights A study on the chord stress function of stiffened X-joints with braces in compression. The chord of the joint is subjected to axial load, in-plane bending moment, or both. Significant reduction of strength is found in the case of chord under tension. A total of 4560 stiffened X-joints are numerically examined in parametric study. Chord stress function and corresponding boundary conditions are proposed.
Abstract Compared to unstiffened circular hollow section (CHS) X-joints, CHS X-joints stiffened with external ring stiffeners and gusset plates have exhibited much higher bearing capacity. To gain insight into the effects of the chord pre-loads on ultimate bearing capacity, this paper presents results of finite element (FE) analyses of the stiffened X-joints with braces under compression and chord under (i) axial load, (ii) in-plane bending moment, or (iii) combinations of axial load and in-plane bending moment. Precision of the FE model under combined brace and chord loads is validated by test results. The ultimate bearing capacities attained by using proportional loading and non-proportional loading respectively are presented, and the results indicate that the differences due to loading path are negligible. The validated FE modelling technologies are then employed in a parametric study on the effect of chord pre-load. A total of 4560 stiffened X-joints are examined in the parametric study. The theoretical analysis presented herein provides a reasonable explanation for the significant reduction in strength of stiffened X-joint when the chord is under axial tension. Finally, a chord stress function with corresponding boundary conditions is proposed, in which the coefficients for different chord load cases are determined through regression analysis. Furthermore, a lower-bound multiplier is given for the function to ensure a conservative design.
Effects of chord pre-load on strength of CHS X-joints stiffened with external ring stiffeners and gusset plates
Highlights A study on the chord stress function of stiffened X-joints with braces in compression. The chord of the joint is subjected to axial load, in-plane bending moment, or both. Significant reduction of strength is found in the case of chord under tension. A total of 4560 stiffened X-joints are numerically examined in parametric study. Chord stress function and corresponding boundary conditions are proposed.
Abstract Compared to unstiffened circular hollow section (CHS) X-joints, CHS X-joints stiffened with external ring stiffeners and gusset plates have exhibited much higher bearing capacity. To gain insight into the effects of the chord pre-loads on ultimate bearing capacity, this paper presents results of finite element (FE) analyses of the stiffened X-joints with braces under compression and chord under (i) axial load, (ii) in-plane bending moment, or (iii) combinations of axial load and in-plane bending moment. Precision of the FE model under combined brace and chord loads is validated by test results. The ultimate bearing capacities attained by using proportional loading and non-proportional loading respectively are presented, and the results indicate that the differences due to loading path are negligible. The validated FE modelling technologies are then employed in a parametric study on the effect of chord pre-load. A total of 4560 stiffened X-joints are examined in the parametric study. The theoretical analysis presented herein provides a reasonable explanation for the significant reduction in strength of stiffened X-joint when the chord is under axial tension. Finally, a chord stress function with corresponding boundary conditions is proposed, in which the coefficients for different chord load cases are determined through regression analysis. Furthermore, a lower-bound multiplier is given for the function to ensure a conservative design.
Effects of chord pre-load on strength of CHS X-joints stiffened with external ring stiffeners and gusset plates
Chen, Yong (author) / Hu, Zhongzheng (author) / Guo, Yong (author) / Wang, Jiyang (author) / Tong, Genshu (author) / Liu, Qingsong (author) / Pan, Yu (author)
Engineering Structures ; 195 ; 125-143
2019-05-25
19 pages
Article (Journal)
Electronic Resource
English
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