The outcomes of the study reveal the critical places for stress concentration as well as the location of maximum damage. A conventional box culvert is analyzed to create the numerical models in the Abaqus FEM code and to investigate the load-bearing capacity of culverts with an expanded span. The Finite Element Method (FEM) based approach is used in studying the effects of haunch geometry and additional steel reinforcement on the load-bearing capacity of box culverts. This research seeks to develop an effective and affordable design improvement procedure for a precast box culvert using modern numerical tools. Precast reinforced box culverts are popular alternatives as they ensure strength, durability, rigidity, and economy. The design and construction of this crucial infrastructure need to be improved to meet contemporary demands of reliability and affordability. They are utilized in drainage areas or water channels and in areas where the bearing capacity of soil is low. The culverts are used to safely convey water under railways, highways, and overpasses.
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