Stainless Steel-Concrete Composite Beams Strengthened with External Tendons: Fid-Bau Portal

Stainless Steel-Concrete Composite Beams Strengthened with External Tendons

Van, My-Lin / El-Zohairy, Ayman

An analytical model was proposed in this research, where the nonlinear material behaviors of stainless steel and concrete were adopted. The proposed analytical model was carried out by the computer software MATLAB to run the iterations and satisfy the equilibrium of the internal forces in the post-tensioned composite sections. Experimental and numerical results from the literature were presented to calibrate the proposed model. The validations include capacities, deﬂections, strains in the extreme fibers of the composite sections, and the incremental PT force in the tendons. The difference in the behavior of post-tensioned composite beams with various structural steel grades (carbon steel and stainless steel) was explored. The external PT force enhanced both the beam stiffness and capacity of the composite beams. The stainless steel with grade 1.4512 obtained the highest improvement in the beam capacity of 27.2% after adding the external PT, whereas grade 1.4362 obtained the lowest increase in capacity of 15.1%. The contribution of the external PT force to improve the behavior of composite beams with stainless steel was enhanced by using stainless steel with lower-yielding and ultimate strengths. However, the post-tensioned composite beam with conventional carbon steel showed higher stiffness and capacity over that one with stainless steel.