Bemessung

Bemessung is the process in engineering of determining the size, shape and material properties of a component or structure so that it satisfies safety, functionality and durability requirements under prescribed loads. It is a core step in the design process, following conceptual planning and statics, and preceding detailing and construction. In practice, Bemessung combines empirical knowledge, material behavior and formal design rules to ensure that the member or structure remains serviceable and safe throughout its life.

In structural engineering, Bemessung uses design codes and standards that specify methods to assess strength and serviceability. In many countries this is done with Eurocodes or national regulations (for example in Germany DIN EN standards). The process typically distinguishes ultimate limit state (ULS) and serviceability limit state (SLS). Loads are characterized with design values and subjected to combinations; the member’s resisting capacity is expressed as design resistances (R_d) and partial safety factors. The calculation delivers dimensions and reinforcement details that satisfy the demand ≤ capacity for all critical states.

Typical steps include: defining loads and load combinations; selecting a candidate cross-section and material; calculating internal forces and checking against capacity; checking buckling, shear, crack width, deflections and durability; selecting reinforcement and detailing; and validating construction tolerances and constructability.

Bemessung applies to buildings, bridges, mechanical components and other engineered systems. It is distinct from full dynamic analyses, though sophisticated designs may incorporate advanced methods for specific cases.