Fatigue fracture of orthotropic steel deck of cablestayedbridge under complex coupling stress(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2021年4期
- Page:
- 78-89
- Research Field:
- 桥梁与隧道工程
- Publishing date:
Info
- Title:
- Fatigue fracture of orthotropic steel deck of cablestayedbridge under complex coupling stress
- Author(s):
- ZHANG Pengfei; YIN Zhihuan; CHANG Jun
- (College of Civil Engineering, Suzhou University of Science and Technology, Suzhou 215011, Jiangsu, China)
- Keywords:
- bridge engineering; random vehicle load; residual stress; coupling effect; fatigue crack growth; welding
- PACS:
- -
- DOI:
- -
- Abstract:
- In order to study the fatigue fracture performance of the welding details of the orthotropic steel deck of the main girder of cablestayed bridge, under the coupling of complex stresses such as random vehicle load and welding residual stress, the Sutong Yangtze River Bridge was used as the engineering background, the MonteCarlo method was used to establish random vehicle load model based on the investigation and statistics of traffic volume, the mechanical behavior of the welding details of the orthotropic bridge deck under random vehicle load was analyzed. In the ANSYS finite element software, the thermal analysis model of welding details was established, the welding heating process and cooling process to obtain the residual stress distribution near the weld toe was simulated. The welding residual stress was regard as the initial stress, the fatigue stress spectrum of the welding details of the orthotropic bridge deck under the coupling effect of random vehicle load and welding residual stress was obtained through numerical simulation. Based on the twoparameters fatigue crack growth model, considering the fatigue crack growth and crack closure effect, the fatigue crack growth behavior of the welding details of the orthotropic steel deck under the coupling effect of random vehicle load and welding residual stress were studied and analyzed. The results show that under the coupling effect of welding residual stress and random vehicle load, the fatigue stress amplitude of welding details is much larger than that of vehicle load. Under the coupling effect of random vehicle load and welding residual stress, the remaining fatigue life of the welded joint between the top plate of the orthotropic steel deck and the Urib decreases with the increase of the crack length. The existence of welding residual stress greatly reduces the fatigue life of welded joints. Compared with the fatigue life of welded joints under random vehicle load, the fatigue life of welding residual stress and vehicle load stress is reduced by 30% to 40%, and the fatigue life is increased with the increase of residual stress. 19 figs, 34 refs.
Last Update: 2021-08-12