Bixby Creek was one of eight historic bridges in California that was upgraded for earthquakes by Buckland & Taylor.
Bixby Creek Bridge, designed in 1931, is one of the most photographed bridges on the West Coast of North America and is listed in the National Register of Historic Places. It is a two lane, reinforced concrete arch bridge with a main span of 98 m (320 ft.).
Buckland & Taylor was chosen to design the seismic retrofit. Two key requirements were that no change to the aesthetics of the bridge should be apparent, and no damage to the sensitive ecological reserve, even temporarily, was permitted.
The solution was to eliminate breather joints in the deck and stress the deck from end to end. The deck thus acted as a large lateral diaphragm connected to the main towers and to new CIDH piles at each abutment. The towers were vertically stressed and tied to new rock anchors drilled from inside. The arches were laterally connected to the deck. The final result was a historic bridge, now capable of withstanding the design earthquake without altering the look of the bridge and without damage to the vegetation.
Darryl Matson, P.Eng.
President & CEO
Tel: +1 604.986.1222
State of California