Tragwerksnachweise

Tragwerksnachweise, or structural proofs, are the calculations and documentation that demonstrate a structure meets safety and performance requirements under the applicable design codes. They are typically produced by licensed structural engineers as part of the structural design process and form a key element of securing planning approval and construction permits.

A Tragwerksnachweis includes load assumptions, material properties, and the structural model used for analysis, as well as the calculation methods and results. Verification is usually performed for ultimate limit state and serviceability limit state, addressing stability, strength, deformations, crack widths, and durability. National and sector-specific standards guide the procedures; in many jurisdictions the Eurocodes with national annexes are the basis for calculations.

The process often involves static and dynamic analyses, consideration of permanent, variable, and accidental loads, and sometimes seismic design. The results are compiled into a structured dossier that may include calculations, software output, drawings, and design reports. The dossier is reviewed by authorities and clients, and must be kept current if the design changes.

Applications cover buildings, bridges, towers, and other structures. Digital methods, including finite element models, are common, and the Tragwerksnachweis may be updated during construction if conditions differ from the design assumptions.

The profession rests with licensed structural engineers or civil engineers specialized in structural design, who must ensure compliance with applicable codes, maintain documentation quality, and, where required, subject the work to independent reviews.