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Abstract

Three structural details of a certain orthotropic plate steel truss composite beam were fabricated as specimens. Their fatigue properties were studied by combining static load tests, cyclic loading of fatigue tests, and the finite element method. The results show that the fatigue cracking position of the welded clamping plate of the bridge deck is in the middle part, and the crack starts to expand from the inside, indicating that the weld here is relatively weak. The reason is that the cross-sectional area of the middle clamping plate part is small. Under the action of cyclic load, it continuously bears a large tensile stress, thereby causing the component to crack. The weakest part of the welded structure between the U-rib and the diaphragm and the bridge deck is the weld between the U-rib and the bridge deck, which breaks first in the fatigue test. The fatigue cracks in the cross-weld structure of the bridge deck, the diaphragm, and the U-rib start from the weld toe and then expand diagonally. The main reason is that under the action of external loads, both the transverse and vertical stresses at the weld toe are relatively large. Under the combined action of forces in both directions, diagonal cracks are prone to occur. These weak parts verified by experiments should be given attention in fatigue design.

Publication Date

6-18-2022

DOI

10.14048/j.issn.1671-2579.2022.03.020

First Page

109

Last Page

114

Submission Date

May 2025

Reference

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