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| Fatigue reliability assessment of PC beam with corrugated steel webs considering welding residual stress |
| Received:July 21, 2021 Revised:October 23, 2021 |
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| DOI：10.7511/jslx20210721001 |
| KeyWord:bridge engineering corrugated steel web beam fracture mechanics fatigue reliability welding residual stress |
| Author | Institution |
| 刘扬 |
湖南工业大学 土木工程学院, 株洲, |
| 马威 |
湖南工业大学 土木工程学院, 株洲, |
| 张海萍 |
湖南工业大学 土木工程学院, 株洲, |
| 邓扬 |
北京建筑大学 土木与交通工程学院, 北京 |
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| Abstract: |
| The influence of welding residual stress on the fatigue life of corrugated steel webs cannot be ignored.In this study, we used the Tou-dao river bridge as the research subject.An ABAQUS model of welding components of corrugated steel webs was established.Various residual stress models of corrugated steel web which considered wave angles were proposed.Then, the stress time history of the weld details in the corrugated corner area which under the action of six typical vehicles were analyzed.On this basis, the fatigue limit state equation of corrugated steel web considering the combined action of welding residual stress and vehicle load was proposed.The influences of different wave angle and traffic growth rates on fatigue reliability index were discussed.The research results show that the longitudinal residual stress on both sides of the hypotenuse of the flange plate-corrugated steel web welded member is symmetrically distributed.The longitudinal residual stress on the outside of the arc in the corner area is, on the whole, higher than that at the inside of the arc.With the increase of the twist angle, the longitudinal residual stress near the welds on both sides becomes larger.The fatigue reliability index of the weld details of the 30° fold angle is 1.05 times that of the 60° fold angle in service for 100 years.The linear increase in traffic volume has a greater impact on the fatigue reliability of the weld details of the Tou-dao river bridge, the fatigue reliability index of the weld details with a linear growth factor of α=0% is 1.84 times that of α=5%. |
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