14 Behavior of Steel-Concrete Composite Beams Under Fatigue Loads 105 Fig. 14.5 For strengthened beam: (a) initial camber, (b) initial strain in the steel bottom flange, and (c) initial strain in the concrete flange Based on the previous expression, the residual deflection of composite beams under fatigue loads depends mainly on the plastic slippage between the concrete flange and the steel beam. So, the residual deflection with the number of cycles behaves similar to the plastic slippage; as illustrated in Fig. 14.6b.
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