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- W608394916 abstract "This paper addresses the design of rail transit aerial guideways and stations to improve their seismic resistance, take advantage of new technical solutions, and recognize the changing economics of their construction materials. It discusses the subtle aesthetic and symbolic influence that has infused itself into our building culture. It addresses the structural concepts of using seismically ductile and light weight steel and composite concrete superstructures, multiple column and redundant element piers and bents, seismic base isolation, rigorous analysis for the soil-structure interaction period of vibration, and equalizing all the links in the structural chain. All these bring into play a new breed of aerial station and guideway. This paper discusses the Los Angeles County Metropolitan Transportation Authority's (MTA's) current seismic criteria for bridges and aerial guideways developed to avoid interruption of MTA operations due to structural damage, and to protect the capital investment of their permanent stationary facilities during their projected service life. Seismic code concepts are presented in familiar terms, and the innate nature of seismic resistant transit guideways is discussed. It compares the MTA design criteria with other current codes such as those of the San Francisco Bay Area Rapid Transit, the California Department of Transportation, and the Orange County Transportation Corridor Agencies. Recent increases in seismic design requirements by MTA and other California agencies are not merely a U.S. Zone 4 issue. Many of the issues are the same in Seattle's zone 3 or New York's zone 2. We may all be underdesigning for site specific seismic effects, even in area where wind presently controls. An increasing number of earthquakes around the world, including 1964 Niigata, 1980 Algeria, 1988 Armenia, the 1989 Loma Prieta, the 1994 Northridge, and 1995 Kobe, have raised questions regarding our state of knowledge and practice in seismic resistant design. Site effects such as the proximity and character of a fault, the shape of a sedimentary basin, and the nature of the soils have cast doubt on earthquake magnitude as a valid predictor of actual ground motion. This uncertainty has increased the desirability of applying precision nonlinear, soil-structure interaction, and site specific spectra analyses to establishing criteria and to solving the actual designs directly. This in turn requires more extensive in-situ geotechnical instrumentation and testing." @default.
- W608394916 created "2016-06-24" @default.
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- W608394916 date "1996-01-01" @default.
- W608394916 modified "2023-09-27" @default.
- W608394916 title "RAIL TRANSIT AERIAL GUIDEWAYS AND STATIONS IN VIEW OF RECENT EARTHQUAKES, TECHNOLOGY, AND CONSTRUCTION ECONOMICS" @default.
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