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Projects : Golden Gate Bridge Exhibit

Golden Gate Bridge Outdoor Exhibition


Seismic Retrofit of Lattice Truss

The original bracing members (struts) in the arch structure and adjacent approach spans were made of hundreds of small pieces of steel riveted together. A seismic retrofit has replaced many of these lattice truss struts with modern one-piece steel tubes – but with triangles carefully laser-cut out so the replacement struts look like the originals.

STATUS: Exhibit currently installed in the Wind and Seismic Exhibit area.

[read more about this exhibit]

display concept mockup with speciment photo by Reitherman from: 10/13/11

The replica of a steel lattice strut of the Bridge was tested in compression until it buckled, to measure its strength.

Photo by A. Astaneh-Asl (UC Berkeley)

Robert Cerney (metal worker) stands next to a section of the UCB lattice strut test specimen that he cut off this exhibit.

Photo taken: 2/21/12

The piece is then sandblasted and later powdercoated to remove rust and other debris.

Photo taken: 4/11/12

Loading galvanized strut specimen to be transported to the GGBHTD for painting and installation.

Photo taken: 4/26/12

Painted to match the color of the Bridge, the strut now resides on the west side of the Bridge under-crossing.

Photo taken: 7/30/12

Funding for the project has been provided by the Division of Research on Learning in Formal and Informal Settings, National Science Foundation. Dr. Al DeSena is the NSF project officer for this award. Any opinions, findings, conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation.

All images are the property of the Golden Gate Bridge, Highway and Transportation District and cannot be re-used without its permission. Contact Mary Currie, Public Affairs Director,

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Consortium of Universities for Research in Earthquake Engineering
last updated 05.27.14