Effects of chord pre-load on strength of CHS X-joints stiffened with external ring stiffeners and gusset plates
Effects of chord pre-load on strength of CHS X-joints stiffened with external ring stiffeners and gusset plates
复制标题
弦预紧力对外环加劲肋和节点板加劲CHS X型接头强度的影响
DOI：
10.1016/j.engstruct.2019.05.076
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发表时间：
2019-09
影响因子：
5.5
通讯作者：
Pan Yu
中科院分区：
文献类型：
--
作者：
Chen Yong;Hu Zhongzheng;Guo Yong;Wang Jiyang;Tong Genshu;Liu Qingsong;Pan Yu
与未加筋的圆管X型节点相比，采用外环加劲肋和节点板加劲的圆管X型节点具有更高的承载能力。为了了解弦杆预紧力对极限承载力的影响，本文给出了带支撑加筋节点在(I)轴向荷载、(Ii)面内弯矩或(Iii)轴向荷载和面内弯矩组合作用下受压和弦杆的有限元分析结果。试验结果验证了支撑和弦杆组合荷载作用下有限元模型的精度。给出了采用比例加载和非比例加载时的极限承载力，结果表明加载路径的差异可以忽略不计。然后，将经过验证的有限元建模技术应用于弦杆预紧效果的参数研究。在参数研究中，共检查了4560个加筋X型节点。本文的理论分析为弦杆受轴向拉伸时加筋节点的强度显著降低提供了合理的解释。最后，提出了一个具有相应边界条件的弦杆应力函数，通过回归分析确定了不同弦杆荷载情况下的系数。此外，为了保证设计的保守性，给出了该函数的乘子下界。
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.
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DOI：
--
发表时间：
2020-03
期刊：
--
影响因子：
--
作者：
R. Roark;W. Young
通讯作者：
R. Roark;W. Young
影响因子：
0.8
作者：
G. J. Vegte;J. Wardenier;Y. Makino
通讯作者：
G. J. Vegte;J. Wardenier;Y. Makino
DOI：
10.4043/5135-ms
发表时间：
1986
期刊：
--
影响因子：
--
作者：
R. Weinstein;J. Yura
通讯作者：
R. Weinstein;J. Yura
DOI：
10.1243/0309324981513084
发表时间：
1998-07
期刊：
The Journal of Strain Analysis for Engineering Design
影响因子：
--
作者：
C. Kang;D. G. Moffat;J. Mistry
通讯作者：
C. Kang;D. G. Moffat;J. Mistry
DOI：
--
发表时间：
1982-03
期刊：
--
影响因子：
--
作者：
J. Wardenier
通讯作者：
J. Wardenier