Experimental Research on Fatigue Life of Composite Beams with Laminated Slabs and Z2 Fatigue Details

In order to popularize the prefabrication construction technology and the application of steel-concrete composite beams in bridge structures and crane beams, it is necessary to carry out experimental research on fatigue life of composite beams with various structural details. 6 composite beams (including 5 composite beams with laminated slabs and 1 composite beam with cast-in-place slabs) were subjected to constant amplitude fatigue load. The double logarithm function was used to linearly fit the test data of 5 composite beams with Z2 structural details, and the S-N curve was obtained. The test results were very close to the provisions of European Convention for Constructional Steelwork (ECCS) and in good agreement with Code for Design of Steel Structures (GB 50017—2003), but there was a certain deviation from GB 50017—2017, mainly because their classifications of structural details were different. The adoption to GB 50017—2017 were unsafe. At this stage, it was recommended to review the design of composite beams in accordance with the relevant provisions of GB 50017—2003.