Comparative Analysis of Two Types of 3D Truss Bridge Designs

Abstract

This project explores a key aspect of modern truss bridge design by analyzing total deformation to determine optimal operating conditions, ultimately reducing material costs in construction. A bridge is a structure designed to span physical obstacles such as rivers, valleys, or roads, providing a safe and efficient passage. Bridges are essential for transportation, connecting regions, and facilitating trade and travel. Their design and maintenance require careful consideration of engineering principles, environmental factors, and material properties. This study focuses on the design and analysis of two truss bridge models using ANSYS software to observe structural changes under operating conditions. Modal analysis is conducted to determine the natural frequencies of the designs, ensuring they do not experience resonance, which can lead to structural failure. Resonance occurs when the vibration frequency of an external force matches the natural frequency of the bridge, causing excessive oscillations. Key factors influencing resonance include the length and thickness of the design. Additionally, stress analysis is performed alongside modal analysis to gain deeper insight into deflections and structural behaviour, helping to optimize bridge performance and durability. Along with the above tests, weight deformation, fatigue analysis, thermal analysis, and wind load analysis are also performed on the two truss bridge designs for better comparison of the test results.