Fatigue performance of composite girder bridge with corrugated steel webs-concrete filled steel tubular truss chords

被引：0

作者：

Chen K.-M. ^{[1
,2
]}

Huang H.-H. ^{[1
]}

Wu Q.-X. ^{[1
,3
]}

Chen B.-C. ^{[1
]}

机构：

[1] School of Civil Engineering, Fuzhou University, Fujian, Fuzhou

[2] Fujian Provincial University Key Laboratory of Engineering Structures, Fujian, Fuzhou

[3] Fujian Provincial Key Laboratory on Multi-Disasters Prevention and Mitigation in Civil Engineering, Fuzhou University, Fujian, Fuzhou

来源：

Jiaotong Yunshu Gongcheng Xuebao/Journal of Traffic and Transportation Engineering | 2022年 / 22卷 / 05期

基金：

中国国家自然科学基金;

关键词：

bridge engineering; composite girder; concrete filled steel tubular truss chord; corrugated steel web; evaluation method; fatigue failure mode; fatigue performance test; hot-spot stress;

D O I：

10.19818/j.cnki.1671-1637.2022.05.012

中图分类号：

学科分类号：

摘要：

To study the distribution laws of hot-spot stress, fatigue performance evolution, and fatigue failure mode of the composite girder with corrugated steel webs-concrete filled steel tubular (CSW-CFST) truss chords, the fatigue performance test and finite element analysis on the composite girder with CSW-CFST truss chords and the composite girder with corrugated steel webs-steel tubular (CSW-ST) truss chords were carried out separately. The differences and similarites between the fatigue performance between composite girders with CSW-CFST truss chords and CSW-ST truss chords were explored. The essential reason for the improved fatigue performance of the composite girder with concrete-filled chords was analyzed, and the evaluation method for the fatigue life of the composite girder with CSW-CFST truss chords was discussed. Moreover, the test result was compared with the calculated fatigue life for the composite girder with CSW-CFST truss chords according to the design standards of the American Petroleum Institute (API), Comité International pour le Développement et l'Etude de la Construction Tubulaire (CIDECT), and Det Norske Veritas (DNV) separately. Research results show that the hot-spot stress of the composite girder with CSW-CFST truss chords acquired by the linear extrapolation is 1.036 times that acquired by the quadratic extrapolation. Therefore, For safety, the hot-spot stress of the composite girder with CSW-CFST truss chords shall be acquired by the linear extrapolation. The hot-spot stress is significantly larger in the inclined web segment than that in the straight web segment, and the maximum hot-spot stress is distributed near the intersection of the inclined web and the arc transition segment. Compared with the situation of the composite girder with CSW-ST truss chords, the hot-spot stress of the composite girder with CSW-CFST truss chords can be reduced by 26.8% by concrete-filled chords, but the distribution laws of hot-spot stress remain changed. It is recommended that the repeated loading times at the initial moment of the fatigue crack should be defined as the fatigue life of the composite girder with CSW-CFST truss chords. The concrete-filled chords can delay the fatigue crack propagation rate along the directions of the thickness and length of chords, and can improve the fatigue life of the composite girder with CSW-CFST truss chords by 61.5%, with the fatigue failure mode and fatigue crack type of the composite girder unchanged. The minimum difference between the test result and the calculated fatigue life of the composite girder with CSW-CFST truss chords by DNV is achieved, which is less than 26.4%. Thus, it is recommended that the fatigue design stress (S)-fatigue life (N) curve of steel tubular intersecting joints provided by DNV should be adopted to preliminarily calculate the fatigue life of the composite girder with CSW-CFST truss chords. © 2022 Chang'an University. All rights reserved.

引用

页码：200 / 216

页数：16

共 33 条

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