Exhibit Area 1
(Plaza area)
Welcome Sign [main directory]
How the Bridge Spans the Golden Gate
Bridge Aesthetics - Art Deco on a Grand Scale
Tall and Strong - The Bridge Towers
Steel, Fog, Salt, Rust, and Paint

Exhibit Area 2
(near flagpole)
How the Bridge Vibrates
Foghorns

Exhibit Area 3
(West side of Bridge near underpass)
Historic Preservation: Lattice Strut Retrofit
Historic Preservation: Isolator Seismic Retrofit

Exhibit Area 4
(inside Battery area)
History: Design and Construction of the Bridge
Suspension Cable Tension vs. Tower Height
Battery Lancaster - Defending the Golden Gate

Exhibit Area 5
(along bike path to lower parking lot)
Bridge Deck Aerodynamics
Bridge Deck Torsional Resistance Retrofit
Wind Speed and Wind Pressure

Exhibit Area 6
(near Pavillion)
LIFETILES: animated construction of the Bridge
Braille / Tactile Model of the Bridge



Project Partners

GGBHTD
Golden Gate Bridge,
Highway and Transporation District



CUREE

Consortium of Universities for Research
in Earthquake Engineering

Main Menu : Exhibit Area 4

History of the Design and Construction of the Bridge

ENGINEERING THE DESIGN

In 1921, engineer Joseph B. Strauss submitted a design for a bridge that would cross the Golden Gate Strait — a hybrid bridge with a suspension span supported at each end by cantilever trusses. By 1929, consulting engineers Leon S. Moisseiff and O.H. Ammann had persuaded Strauss to accept the more graceful all-suspension bridge design that we see today.

Strauss assigned engineer Charles A. Ellis to work in collaboration with Moisseiff to perform the calculations needed to complete the design, which was complex and challenging work done without modern computers. The most common "calculator" that structural engineers used in that era was a slide rule, and drafting was done with pencil and paper on drawing boards.

The engineers relied on recent advances in suspension bridge design theory. They verified those calculations with tests on a steel tower model of 1:56 scale (56 times smaller than one of the actual towers). The tests confirmed that the tower calculations were sound.

The geology of the south tower location was investigated before construction could begin. The south tower was planned for construction over 1,100 feet (335 meters) offshore on serpentine rock. Consulting geologist Andrew C. Lawson oversaw a load test performed by placing weight equivalent to a fully loaded railroad boxcar on an area of serpentine rock only 20 inches (508 millimeters) square. The rock was more than strong enough.  

MORE IMAGES

Early design, dubbed as "ugly" by the local press, called for heavy-looking cantilevered structures jutting out from the towers.

Image courtesy of the California Historical Society

A model of one of the Bridge towers was loaded in a civil engineering testing machine at Princeton University in 1933. One test, with a scaled-down force, simulated the actual 120 million pounds (54 million kilograms) of vertical load that would be placed on the top of each full-sized tower by the main cables. (To visualize that much weight, picture a large ocean liner.)

All images property of the Golden Gate Bridge, Highway and Transportation District (unless otherwise indicated).

For more information -

Golden Gate Bridge Design
http://goldengatebridge.org/research/Design.php

The Strauss Team
http://goldengatebridge.org/research/StraussTeam.php

Bridge Design and Construction Statistics
http://goldengatebridge.org/research/factsGGBDesign.php

Construction Timeline Golden Gate Bridge
http://goldengatebridge.org/research/ConstructionTimeline.php


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Last updated: 11.16.12