Oakland Bay Bridge.
San Francisco, CA, USA
The San Francisco-Oakland Bay Bridge East Span consists of four major components; the signature 385 m single-tower, self-anchored suspension span, the 1.6 mile dual box girder skyway, the 467 m Yerba Buena Island transition structures, and the 406 m Oakland touchdown approach. Complex and varied geological conditions at the bridge site, hazardous seismic conditions, and state-mandated design criteria contributed to the challenges of designing and constructing this landmark lifeline structure.
This self-anchored suspension span is the first single cable suspension span in the world. The main suspension cable is composed of 137 strands with 127 5-mm diameter high strength steel galvanized wire, in each strand, totaling 17,399 wires in the entire cable.
The PWS technology for fabrication and erection of the main suspension cable, of the San Francisco-Oakland Bay Bridge, was one of the early applications of in the United States. As a new technology on the first single cable suspension in the world, a mock-up of the PWS strand cable was thought to provide confidence in the technology. BTC provided the design of the mock-up of the cable, which includes a self-supporting frame. SHANGHAI PUJIANG CABLE COMPANY (SPCC), of the P.R. CHINA fabricated the cable mock-up from the same stock of 5-mm diameter wires, which SPCC used to fabricate the San Francisco-Oakland Bay Bridge main suspension cable.
The cable mock-up is under tension, with a total force of 5,782kN. (1.3 million pounds) This applies, on every single wire the level of load comparable to that on a real suspension bridge wire.