A Magyar Állami Operaház (MAO) auditóriuma feletti szerkezetek vizsgálata és megerősítése
Examination and reinforcement of the structures above the auditorium of the Hungarian State Opera House (MAO)

Author(s): Péter Rabb
Subject(s): Museology & Heritage Studies, Music, Architecture, Visual Arts
Published by: Pécsi Tudományegyetem Művészeti Kar Művészettörténet Tanszék
Keywords: Hungarian State Opera House; structural engineering; Lotz fresco; roof reinforcement; historic preservation; steel framework; timber roof structure; Feketeházy János; monument restoration; structural diagnostics
Summary/Abstract: The study investigates the structural problems and reinforcement of the roof structures above the auditorium of the Hungarian State Opera House during its recent restoration. The research focused on the cracking of Károly Lotz’s famous ceiling fresco, The Apotheosis of Music, and aimed to identify the structural causes behind the damage. The author demonstrates that the cracks correspond directly to the underlying nineteenth-century steel and timber support system designed by Feketeházy János. Detailed measurements and structural analysis revealed that the wooden roof structure had gradually deformed over nearly 140 years, transferring unexpected loads onto the steel framework supporting the fresco. The study explains how the auditorium roof functions as an integrated system composed of a radial steel structure, timber roof trusses, and a large smoke-extraction cylinder connected to the historic chandelier. Non-destructive material testing showed that the timber had significantly weakened over time, partly due to fungal decay and long-term structural fatigue. Structural calculations confirmed that the accumulated deformations caused additional stresses in the steel framework, reopening cracks that may originally have formed during the 1911 Kecskemét earthquake. The engineers classified the structure as dangerous according to modern safety standards and developed a reinforcement strategy that minimized movement in order to protect the fresco during restoration. The reinforcement combined steel support elements and innovative structural techniques inspired by the “vector decomposition” principle associated with Santiago Calatrava. Overall, the article demonstrates how interdisciplinary cooperation between engineers, architects, conservators, and restoration specialists successfully stabilized the historic structure and preserved one of Hungary’s most important monumental artworks.

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