Optimum Design Configuration of Dapped-End Beam Under Dynamic Loading Using TOPSIS Method

Abstract

– Dapped-end beams (DEBs), commonly known as half joint beams, are broadly used in bridge constructions. The reduction of the depth at the supports of the beam makes it a critical shear area and vulnerable to damage. Being used primarily on bridges, dapped-end beams are susceptible to dynamic impact loading, which is more brutal than static load cases. Various reinforcement configurations combined with different concrete properties were used to withstand the stresses generated by such loadings and mitigate their effect on the critical shear location. To reduce the extensive work and use of resources required to investigate such problems, numerical investigations were conducted on LS-DYNA software to anticipate the enhancement in the shear capacity as a function of compressive strength, main reinforcement, and shear hanger reinforcement configurations. Multi-criteria decision-making using TOPSIS analysis was conducted to choose the best scenario configuration that maximizes the beam’s performance under dynamic impact loading. TOPSIS analysis was based on the deflection of the beam, shear strength of the concrete, and stress and strain of main and hanger reinforcement.