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[[Structural engineering]] depends upon a detailed knowledge of [[Structural load|loads]], [[physics]] and [[materials]] to understand and predict how structures support and resist self-weight and imposed loads. To apply the knowledge successfully a structural engineer will need a detailed knowledge of [[mathematics]] and of relevant empirical and theoretical [[design codes]]. He will also need to know about the [[corrosion]] resistance of the materials and structures, especially when those structures are exposed to the external environment.
The criteria which govern the design of a structure are either serviceability (criteria which define whether the structure is able to adequately fulfill its function) or strength (criteria which define whether a structure is able to safely support and resist its design loads). A structural engineer designs a structure to have sufficient [[Strength of materials|strength]] and [[stiffness]] to meet these criteria.
Loads imposed on structures are supported by means of forces transmitted through structural elements. These forces can manifest themselves as:
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