Multiaxial Fatigue Evaluation of U -rib to Deck Welded Joint in Steel Bridge Deck
[1]Gibb Sea,Jiang Fei,Wang Yixun,et al.Multiaxial Fatigue Evaluation of U -rib to Deck Welded Joint in Steel Bridge Deck[J].Journal of Zhengzhou University (Engineering Science),2020,41(01):25-31.[doi:10.13705/j.issn.1671-6833.2020.01.002]
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Journal of Zhengzhou University (Engineering Science)[ISSN
1671-6833/CN
41-1339/T] Volume:
41
Number of periods:
2020 01
Page number:
25-31
Column:
Public date:
2020-03-10
- Title:
- Multiaxial Fatigue Evaluation of U -rib to Deck Welded Joint in Steel Bridge Deck
- Keywords:
- multiaxial fatigue; Orthotropic steel bridge decks; Absolute maximum principal stress; Top plate-U rib weld
- CLC:
- -
- Abstract:
- To evaluate the multiaxial fatigue of U-rib to deck welded joint, the main stress component was defined as the normal stress with maximum amplitude along coordinate axes. The stress state under uniaxial and multiaxial fatigue was compared based on elastic mechanics, and the deviation between the maximum absolute principle stress and the main stress component was proposed as the basis for evaluating the multiaxial fatigue. Then segment model of steel bridge deck and submodel of joint detail were established. The deformation and stress state of welded joint under multiaxial fatigue were evaluated. In order to quantify the difference between uniaxial and multiaxial fatigue life assessment, the fatigue life ratio was defined, and the relationship between and was deduced theoretically, which was verified by experiment and finite element analysis. The result shows that when it’s under uniaxial load, the maximum absolute principal stress is equal to the main stress component. There is a deviation between the two kinds of stresses under multiaxial load and the greater the deviation, the more significant the multiaxial fatigue effect is. The effect of multiaxial fatigue becomes more significant when the load center deviates from the weld position, and the multiaxial stress state of welded joint located at the diaphragm is more obvious. is proportional to , which provides a reference for multiaxial fatigue life assessment based on uniaxial fatigue assessment
- References:
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Last Update:
2020-02-22