Steel is characterized by high strength, light weight, excellent overall stiffness, and strong resistance to deformation, making it particularly suitable for constructing large-span, ultra-tall, and super-heavy buildings. Its material homogeneity and isotropy are excellent, making it an ideal elastic body that aligns well with the fundamental assumptions of general engineering mechanics. The material exhibits good plasticity and toughness, allowing for significant deformation and enabling it to effectively withstand dynamic loads.