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During structural analysis, engineers typically focus on properties that directly impact the behavior and performance of a structure under various loads. Strength of materials, elasticity, and stress and strain levels are critical parameters that help in evaluating how materials will perform in real-world applications.

Strength of materials refers to the ability of a material to withstand loads without failing. Elasticity measures how well a material can return to its original shape after deformation, which is essential for understanding how structures will behave under various dynamic loads.

Stress and strain levels are fundamentally important for predicting failure modes and ensuring that structures can safely carry expected loads without excessive deformation or damage.

In contrast, the color of materials is not a relevant factor in structural analysis. While color may be important in design aesthetics or marketability, it has no bearing on a structure's mechanical performance or safety. Therefore, when considering the properties relevant to structural analysis, color is not typically included.