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Comparison on Fatigue Structural Details of CFST Welded Joints Based on Hot Spot Stress Method(PDF)

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

Issue:
2020年05期
Page:
1-12
Research Field:
Publishing date:

Info

Title:
Comparison on Fatigue Structural Details of CFST Welded Joints Based on Hot Spot Stress Method
Author(s):
LIU Yong-jian1; 2;  LONG Xin1;  JIANG Lei1; 2;  LIU Zhen-bei1
1. School of Highway, Chang’an University, Xi’an 710064, Shaanxi, China; 2. Research Center of Highway Large Structure Engineering on Safety of Ministry of Education, Chang’an University, Xi’an 710064, Shaanxi, China
Keywords:
hot spot stress method;  stress concentration factor;  concrete-filled steel tube;  welded joint;  fatigue structural detail;  fatigue performance
PACS:
U441.5
DOI:
10.19815/j.jace.2020.09035
Abstract:
Taking the concrete-filled steel tube composite truss bridge as the research object, the fatigue evaluation process of the joints of the concrete-filled steel tube composite truss bridge based on the hot spot stress method was summarized, and the structural details of fatigue control joints of concrete filled steel tube composite truss bridge were studied. The results show that, through filling the main tube with concrete, the maximum stress amplitude of rectangular equal width branch and main tube is reduced by 10.86% and 26.51% respectively, and the fatigue life of the joints is increased by 3.78 times; the circular tubular joints, the maximum stress amplitude of branch and main tube is reduced by 13.88% and 16.39% respectively, and the fatigue life of the joints is increased by 2.11 times; the joint with square main tube and circular branch tube, the maximum stress amplitude of branch and main tube is reduced by 20.06% and 29.81% respectively, and the fatigue life of the joint is increased by 1.92 times. For rectangular steel tube joints, PBL stiffeners are set on the basis of concrete filled in the main tube, and integral gusset plate is used. As a result, the maximum hot spot stress amplitude of the branch tube further decreases by 12.11% and 29.20%, and the maximum hot spot stress amplitude of the main tube further decreases by 8.81% and 15.64%. Therefore, by improving the fatigue details of the joint composed of rectangular steel tubes of equal width, the stress distribution at the welded joint is more uniform and the fatigue life is significantly improved. At the same time, based on the premise of equal axial stiffness of the branch and main tube members, the order of the fatigue performance of the structural details of joints is as follows: the PBL stiffened concrete filled rectangular steel tube integral joint, the PBL stiffened concrete filled rectangular steel tube equal-width joint, the concrete filled rectangular steel tube equal-width joint, the rectangular steel tube equal-width joint, the concrete filled circular steel tube joint, the circular steel tube joint, the joint with concrete filled square main tube and circular branch tube, the joint with square main tube and circular branch tube.

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Last Update: 2020-10-15