|Table of Contents|

Axial Stiffness of RHS and CFRHS T-joints with Unequal Width Subjected to Tension(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2020年01期
Page:
1-13
Research Field:
Publishing date:

Info

Title:
Axial Stiffness of RHS and CFRHS T-joints with Unequal Width Subjected to Tension
Author(s):
LIU Yong-jian;  WANG Wen-shuai;  MA Yin-ping;  JIANG Lei;  LONG Xin
(School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China)
Keywords:
rectangular hollow section joint;  concrete-filled rectangular hollow section joint;  joint axial stiffness;  simplified calculation model
PACS:
TU311
DOI:
10.19815/j.jace.2019.11073
Abstract:
In order to obtain the simplified calculation formula of the axial stiffness of the T-joint, a plane frame calculation model suitable for the rectangular hollow section(RHS)joints and a fixed end beam model for concrete-filled rectangular hollow section(CFRHS)joints were proposed according to the characteristics of the joint force. Then the theoretical formula of the joint axial stiffness of the two joints types was derived. The finite element method was used to analyze the joint domain effective length leff in joint axial stiffness formula, and the simplified formula of leff was obtained by fitting. The theoretical formula of the joint axial stiffness was compared to the experimental and finite element model(FEM)results, then the influence of the concrete filled in the chord on the joint axial stiffness was analyzed. The results show that heigh-width ratio and width-to-thickness ratio of chord have little effect on leff and can be neglected. leff has a linear relationship with width of chord and height-width ratio of brace, and increases with them. The effective length leff has a nonlinear relationship with width ratio of brace and chord β, and decreases when β increases. The axial stiffness calculation formula of the two joints types agree well with the experimental and FEM results. The concrete filled in the chord can increase the joint axial stiffness, and the increase coefficient kc/h increases with the increase of height-width ratio of chord. Moreover, kc/h increases first and then decreases with the increase of β, and the maximum value occurs when β=0.6-0.7.

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Last Update: 2020-01-13