Abstract
This paper presents the environmental benefit and mechanical behavior of steel-concrete composite beams, and the fatigue deflection in the negative moment regions was studied emphatically. Firstly, through the comparison with concrete bridges, the environmental and economic benefits of steel-concrete composite girder bridges were analyzed. Then fatigue behavior of steel-concrete composite beams subjected to hogging moment was studied, and fatigue tests with different load amplitudes were performed on two composite beam specimens subjected to negative moment. Finally, the failure modes, load-deformation responses, and residual deformation under fatigue loading were cautiously measured and analysed.
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