Abstract

Bridges are very important elements in a modern transportation system. Recent earthquakes, particularly the 1980 Loma Priets and the 1994 Northridge Earthquakes in California, the 1995 Hyogo-Ken Nanbu Earthquake in Japan, the 1999 JiJi Earthquake in Taiwan, and the 1999 Kocaeli Earthquake in Turkey, have caused collapse of, or sever damage to, a number of major bridges. Since the 1989 Loma Prieta Earthquake, extensive research has been done on seismic design and retrofit of bridges in Japan and the United States, especially in California. This chapter will discuss the seismic bridge design philosophies and conceptual design in general as well as discuss U.S. seismic design practice to illustrate the process. The chapter will also briefly presents seismic design practice in Japan.

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