Research on Mechanical Properties of CHS-to-SHS Gap N-Joints

YUAN Zhishen; GAN Yu; YAO Yao; SHU Xingping

doi:10.13204/j.gyjzG21082001

Volume 52 Issue 3

Jul. 2022

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Article Navigation > INDUSTRIAL CONSTRUCTION > 2022 > 52(3): 132-140

YUAN Zhishen, GAN Yu, YAO Yao, SHU Xingping. Research on Mechanical Properties of CHS-to-SHS Gap N-Joints[J]. INDUSTRIAL CONSTRUCTION, 2022, 52(3): 132-140. doi: 10.13204/j.gyjzG21082001

Citation:

YUAN Zhishen, GAN Yu, YAO Yao, SHU Xingping. Research on Mechanical Properties of CHS-to-SHS Gap N-Joints[J]. INDUSTRIAL CONSTRUCTION, 2022, 52(3): 132-140. doi: 10.13204/j.gyjzG21082001

YUAN Zhishen, GAN Yu, YAO Yao, SHU Xingping. Research on Mechanical Properties of CHS-to-SHS Gap N-Joints[J]. INDUSTRIAL CONSTRUCTION, 2022, 52(3): 132-140. doi: 10.13204/j.gyjzG21082001

Citation:

YUAN Zhishen, GAN Yu, YAO Yao, SHU Xingping. Research on Mechanical Properties of CHS-to-SHS Gap N-Joints[J]. INDUSTRIAL CONSTRUCTION, 2022, 52(3): 132-140. doi: 10.13204/j.gyjzG21082001

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Research on Mechanical Properties of CHS-to-SHS Gap N-Joints

doi: 10.13204/j.gyjzG21082001

1. College of Civil Engineering, Central South University of Forestry and Technology, Changsha 410004, China;
2. College of Urban Construction, Zhejiang Shuren University, Hangzhou 310015, China;
3. College of Civil Engineering, Hunan University, Changsha 410082, China

Received Date: 2021-08-20

Abstract

Abstract

In order to study the static behavior of CHS-to-SHS gap N-joins and its relations with the behavior of overlap joints, two CHS-to-SHS gap N-joints and two corresponding overlap joints were tested. The test revealed that the bearing capacity of the gap joints was lower than that of the overlap joints with the same diameter of the tubes. Obvious local plasticity failure of the chord occurred in all the four joints, and local buckling also occurred in the two joints with smaller branches. Meanwhile, the relative deformation of the chord wall of the gap joints was larger than that of the corresponding overlap joints at the ultimate state. Based on the experiment, the finite element analysis models of CHS-to-SHS gap N-joints were established, and the finite element analysis of the joints with different brace-to-chord width ratios, chord width-to-thickness ratios, brace-to-chord thickness ratio, axial loads of chord and gap sizes between braces was carried out. The analysis results showed that the main failure modes of the gap joints were the brace member failure(BMF), the chord plasticity failure(CP), and the combined failure of brace local buckling and chord plasticity(BLB+CP). Moreover, the influence of brace-to-chord width ratio, chord width-to-thickness ratio, brace-to-chord thickness ratio and axial force of chord on the bearing capacity of CHS-to-SHS gap N-joints was similar to that of corresponding overlap joints. Furthermore, the effect of gap size between braces on the bearing resistance of CHS-to-SHS gap N-joints could not be neglected. Finally, based on the design equation in the code, a formula for predicting the ultimate bearing capacity of CHS-to-SHS gap N-joints was proposed by applying multivariate regression analysis.
- CHS-to-SHS gap N-joint,
- ultimate bearing capacity,
- failure mode,
- geometric parameters,
- gap between braces

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References(17)

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