Comparative Structural Analysis of ۸-m Concrete Bridge Decks (۵۰-cm Thickness) under Concentrated and Distributed Vertical Loads: Single-Span vs. Two-Span Continuous Systems

The structural performance of concrete bridge decks is significantly influenced by structural configuration and geometry, particularly the choice between simply supported single-span and two-span continuous systems. This study presents a detailed comparative finite element analysis (FEA) of ۸-meter span concrete bridges with a ۵۰-cm deck slab thickness, subjected to vertical loading conditions. The primary objective is to evaluate and compare the mechanical responses, specifically focusing on Von Mises stress distribution and vertical displacement ( ), between single-span and two-span continuous configurations. High-fidelity numerical models were developed to simulate the structural behavior of both systems under identical loading and boundary conditions. The results indicate that structural continuity in the two-span system significantly alters the load path, leading to characteristic moment redistribution that influences stress patterns compared to the determinate nature of the single-span bridge. While the single-span configuration exhibits lower peak stress concentrations, the two-span continuous model demonstrates enhanced structural redundancy and more efficient load-sharing capabilities across the intermediate support. The increased deck thickness to ۵۰ cm provides substantial stiffness, yet the comparative findings highlight essential trade-offs between localized stress levels and overall structural robustness. This study provides critical insights for bridge engineers in selecting appropriate structural systems, emphasizing that continuity offers superior resilience for short-span bridge decks under service loads.

کلیدواژه ها:

Concrete Bridge ، Single-Span ، Point Loading ، Structural Performance