Open-Air Theatre Grandstand Roof Structure in Sömmersdorf, Germany

Customer Project

Client Fränkische Passionsspiele Sömmersdorf
Architect Dipl.-Ing (FH) Michael Theiss, Oberwerrn
Structural Analysis Joachim Ingenieure, Schweinfurt
Dipl.-Ing. (FH) Stephan Knop

An impressive roof structure was constructed over the Passion Play open-air theatre in Sömmersdorf, Franconia (Germany). The self-supporting spatial steel structure includes a PVC membrane roof covering the 1,385 m2 auditorium. Only four foundations in total support the entire roof structure.

The valuable Dlubal customer Joachim Ingenieure was the design engineer for this fascinating project. The engineering office utilized RSTAB for the structural analysis.


The main structure includes two pairs of framework arched trusses inclined in opposite transverse directions. The trusses have a free span close to 45 m. Twelve additional trusses span between the main arched truss pairs in the longitudinal direction. They also cantilever 8 m at the end locations. The total length of the roof structure amounts to 40 m.

The arched trusses as well as the intermediate trusses consist almost exclusively of circular tube sections. The roof’s transverse stiffness is provided by the arched trusses while the longitudinal stifness is provided by the intermediate trusses as well as X-braces.

The four abutments constructed at a 45° angle are fixed to the ground with a reinforced concrete foundation including micropiles with varying angles. The micropiles for one abutment measure a total length of 132 m.

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The structural engineering software for design of frame, beam and truss structures, performing linear and nonlinear calculations of internal forces, deformations, and support reactions

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