by W.D. Liu, A. Kartoum, K.
Chang and R. Imbsen
February 2000, 132 pp.
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The most significant impact of recent earthquakes in California is the damages
incurred in the transportation structures. The 1989 Loma Prieta earthquake in
Northern California was probably the first instance that a major long span bridge,
i.e., the East Bay Crossing of the San Francisco-Oakland Bay Bridge, was damaged
by an earthquake. Recognizing the significant economical and social impact of such
major structures, Governor Deukmejian's Board of Inquiry recommended that "all
transportation structures be seismically safe and important transportation
structures maintain their function after earthquake." In other words, for important
structures, not only collapse failure must be prevented, but also that the extent of
damage due to an earthquake must be limited and the function of the bridge must
be restored quickly.