Digital fatigue test of steel truss girders in long-span suspension bridge with double-deck

The steel truss girders with double-deck are widely used in long-span suspension bridges due to its superior mechanical properties and traffic capacity. However, the fatigue mechanism of such bridges under multi-lane loads is uncertain. In order to clarify this issue, full size digital fatigue test...

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Bibliographic Details
Published inBridge Maintenance, Safety, Management, Digitalization and Sustainability pp. 3001 - 3008
Main Authors Wu, Q.L., Zhang, T.K., Xu, J., Liu, S., Wang, C.S.
Format Book Chapter
LanguageEnglish
Published CRC Press 2024
Edition1
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Summary:The steel truss girders with double-deck are widely used in long-span suspension bridges due to its superior mechanical properties and traffic capacity. However, the fatigue mechanism of such bridges under multi-lane loads is uncertain. In order to clarify this issue, full size digital fatigue test considering detail welding residual stress (WRS) is carried out. Based on the theory of Extended Finite Element Method (XFEM) and the Linear Elastic Fracture Mechanics (LEFM), the fatigue crack propagation law of the details is researched. The results show that the WRS of the fatigue-prone detail is close to the yield strength of the steel. Thus, the influence of WRS should be considered in the fatigue assessment. Then, the cracking of fatigue details is caused by out-of-plane distortion under the multi-field coupling effects. Moreover, the fatigue cracks are Mode I-II-III combined cracks dominated by Mode I through analysis of fracture parameters.
ISBN:1032775602
9781032775609
1032770406
9781032770406
DOI:10.1201/9781003483755-356