Christian Menn

Menn worked with a young Miguel Rosales on the Leonard P. Zakim Bunker Hill Memorial Bridge, completed in 2003, as part of the massive "Big Dig" project in Boston. This highly-visible structure has become an iconic landmark in the Boston skyline, and helped launch Rosales' career as a bridge designer, carrying the older designer's philosophy into the next generation of structural designers.

Menn's bridges had to be designed for the times: Structural Analysis found itself at the time in the transition from descriptive graphical analysis to abstract analytical statics. (Menn, 2002)

Later, with prestressing, Menn was able to design bridges that combined appropriately a prestressed cantilever girder bridge deck with a cable-stayed bridge form, introducing new forms as exemplified by his Ganter bridge (1980). In the words of David P. Billington: “Ganter bridge ... represents one of those rare events where a new form arises”.

In spring 1979, Menn supervised a thesis on a bridge over the Acleta gorge close to Disentis in the Grisons by a young Santiago Calatrava, as he completed his studies in Civil Engineering at ETH Zurich. That same year, Menn also asked Calatrava to provide sketches for a bridge on tall pylons to cross a deep valley, and these sketches by Calatrava in 1979 containing finback and extradosed solutions were finally published in 2004.

But with the revolutionary new material — prestressed concrete — Menn saw that prestressing could actually replace the arch itself. The prestressed deck of his arch bridge could become the main supporting member without the arch. His Felsenau Viaduct (1974) at Bern did exactly that — the roadway was carried solely by a curved hollow-box beam that has been prestressed. The effect is a structure of exceptional lightness that satisfies all three of Menn's main criteria for design: efficiency, economy, and aesthetics. It is the longest viaduct of the A1 highway and the world's first single-cell box girder bridge built with the cantilever method, a pioneer work in prestressed concrete design and construction.

Menn worked very closely with Pierre Lardy during the beginning of his career, emphasizing the design of structures based on aesthetics and economy. Menn believed that economy, serviceability and safety of the bridge would revolve around aesthetics. His earliest bridges were relatively long-span deck-stiffened arches in the tradition of Robert Maillart. For example, his Crestawald Bridge (1959) was a reinforced concrete bridge with a two-hinged arch.

Menn led his own engineering company in Chur from 1957 to 1971. From 1971 until his retirement in 1992, he was a professor of structural engineering at ETH Zurich, specializing in bridge design. In his retirement years, he continued to be a consulting engineer in private practice.

Born in Meiringen, Canton of Bern, Menn graduated from high school (Kantonsschule Chur) in 1946, followed by structural engineering studies at ETH Zurich. He received a diploma as Bauingenieur (civil engineer) in 1950. From 1950 through 1953 he worked for construction engineering companies. Then, he returned to ETH Zurich to become assistant to Pierre Lardy, a well-known professor of structural engineering, and was awarded a PhD degree in 1956. He gained practical experience working for companies in Paris and Bern before starting his own consulting company in 1957.

Christian Menn (March 3, 1927 – July 16, 2018) was a renowned Swiss civil engineer and bridge designer. He was involved in the construction of around 100 bridges worldwide, but the focus of his work was in eastern Switzerland, especially in canton Graubünden. He continued the tradition of and had a decisive influence on Swiss bridge building. The technical and aesthetic possibilities of prestressed concrete were most fully realized with his bridges in Switzerland.