Relaxation Behavior of Residual Stress on Deck-to-Rib Welded Joints by Fatigue Loading in an Orthotropic Bridge Deck

  • Wen Zhong Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, 210096, Nanjing, China
  • You-liang Ding Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, 210096, Nanjing, China
  • Yong-sheng Song School of Architecture Engineering, Jinling Institute of Technology, 211169 Nanjing, China
  • Fang-fang Geng School of Architecture Engineering, Nanjing Institute of Technology, 211167 Nanjing, China

Abstract

To accurately evaluate the influence of the actual tension and compression state and stress ratio at the deck-to-rib welding seam position on the fatigue life of a bridge deck, this paper establishes a coupled stress analysis model that considers the welding residual stress and vehicle stress. Taking the Jiangyin Bridge as an example, a qualitative analysis of the fatigue life under the vehicle load and residual stress field is carried out using the proposed method. A case analysis showed that when the residual tensile stress in the welding seam position is superimposed on the mainly tensile cyclic vehicle load stress, the longitudinal stress relaxation exceeds the peak vehicle load stress; significant longitudinal stress relaxation occurred, while the transverse stress relaxation is not significant. However, when the residual tensile stress is superimposed on the mainly compressive cyclic vehicle load stress, the relaxations of both the longitudinal and transverse stresses are not obvious. Compared with the stress state of the welding point under the action of only the vehicle stress, when the coupling effect of the residual stress and vehicle stress is considered, i.e., the loading condition, the fatigue stress state of the weld point has undergone an essential change under cyclic compressive stress, that is, the compressive stress state that does not require a fatigue check is changed to the tensile stress state. Although the fatigue state of the tensile stress cycle condition has not changed, the fatigue life is reduced by varying degrees under either the compressive or tensile condition.

Keywords: orthotropic steel deck (OSD), stress relaxation effect, deck-to-rib welding details, welding residual stress, coupling stress
Published online
2019-11-18
How to Cite
Zhong, W., Ding, Y.- liang, Song, Y.- sheng, & Geng, F.- fang. (FIRST). Relaxation Behavior of Residual Stress on Deck-to-Rib Welded Joints by Fatigue Loading in an Orthotropic Bridge Deck. Periodica Polytechnica Civil Engineering. https://doi.org/10.3311/PPci.14250
Section
Research Article