Comparative Design of Different Trusses by using Different Material, Cross-section, and Truss type for Footbridge Applications

Abstract

This study presents the analysis and design of various truss systems for medium-span footbridges, focusing on identifying the most cost-effective configuration. The analysis considers different truss types, material types, and cross-sections to determine their economic and structural performance. The truss type analyzed include the Warren and N-types, utilizing Tata and channel sections. Among these, the model requiring the least steel after design that model was further designed using different cross-sections to identify the most efficient option. The comparison was conducted based on maximum deflection, yield strength, and steel usage across various truss types and cross-sections. Subsequently, a cost analysis was performed to evaluate the economic viability of different configuration. The results indicate that the Warren truss with Tata circular sections reduces costs and steel usage by 2.49 and 1.71 times respectively for footbridge, although it exhibits averagely 22.35 % higher deflection than all other trusses. This study highlights the significance of selecting appropriate truss systems, materials, and cross-sections to achieve cost-effective and structurally efficient footbridge designs.