This report delves into the fundamental principles of structural behaviour, exploring the relationship between structural materials, health and safety, and practical applications. It examines beam arrangements, support methods, load types, and design responsibilities under CDM regulations. The report also defines key concepts like Young's modulus, section modulus, and the second moment of area, and provides a detailed analysis of elastic bending theory and Newton's laws of motion. This comprehensive study aims to enhance understanding of structural mechanics and its practical implications in the field of civil engineering.