Abstract
In the analysis and design of steel-concrete composite bridges, stresses and displacements are typically computed on the basis of elementary beam theory by using the effective flange width concept. Currently, the AASHTO load and resistance factor design (LRFD) code specifies the same effective flange width design criteria for both positive moment sections and negative moment sections. The effective flange width concept for the positive moment has been well established by many researchers. However, the classical effective flange width definition does not take into account the strain variation through the slab thickness or the stress transfer mechanism from concrete to steel reinforcements after cracking. A more appropriate effective flange width definition for the negative moment section is introduced to account for these factors. This definition was developed on the basis of the effective flange width definition for positive moment sections proposed previously. The proposed definition for the negative mom...
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