The response of reinforced concrete is frequently nonlinear and exhibits quasi-brittle failure consistently throughout their service lives. Several materials and procedures have been used to boost the capacity some of which are often expensive. Waste tire steel fiber was used in this study for environmental sustainability, ensuring economy, efficiency, and elegance as part of the SDG goals. Nine (9) RC slender beams with dimensions 1500 × 250 × 120 mm were cast and loaded at a shear span to depth ratio of 2.44. Slender beams with fiber contents of 0.5 and 1% by volume of concrete and without fiber were considered and subjected to increasing static loading to understand the failure response and post-peak behavior after the beam’s ultimate failure. The dominant failure observed throughout the investigation was shear. The addition of 1% waste fiber increased the shear capacity of the beam without shear reinforcement by 10%, 0.5% waste fiber together with shear reinforcement increased the shear capacity and ductility by 17% and 41% over the shear-reinforced beams without waste fiber, and about 58% greater than in beams without the shear reinforcement and waste fiber. The applicability of FEM analysis under the elastoplastic constitutive model of RC elements replicates consistency with the experiment.

Reinforced concrete dapped end beams (RC-DEBs) in service suffer damage near the reentrant section under unknown loading conditions, reducing service life, particularly when recurrent loading is considered. In this investigation, a Finite Element Model (FEM) of a standard RC-DEB was used, together with a 3-dimensional concrete model and a fixed constitutive model. The girder reinforcement was designed in compliance with Eurocode 2 (EN-2) criteria for shear and deflection analysis. The level of deterioration under fatigue difficulties was determined by doing a fatigue analysis of moving and fixed pulsing loads at the midpoint and offset loading. A scaled-down experimental validation of the FEM for fixed pulsing loading was considered to better understand fatigue deterioration for practical applications. The major mode of damage observed is shear brittle failure at the beam's reentrant region. Although the moving load proved to be more damaging than the fixed pulsing load, loading at an offset of a/d of unity had an effect on the reentrant portion. The EN-2 code is nonconservative when it comes to describing the reinforcement at the reentrant section; for optimal performance, the hanger reinforcement must be properly anchored to the shear.