Development of Design Criteria for Transit Guideways


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Title: Development of Design Criteria for Transit Guideways

Author(s): Andrzej S. Nowak and Hid N. Grouni

Publication: Journal Proceedings

Volume: 80

Issue: 5

Appears on pages(s): 387-395

Keywords: criteria; girgers; guideways; load factors; prestressed concrete; rapid transit railways; reliablity; safety factor; structural design.

Date: 9/1/1983

Genrally, transit guideways have been designed using highway and railway bridge design codes. However, there are significant differences berween structures supporting highwuy and roadway traffic and those supporting transit vehicles, particularly, in values and variations of load components. This may result in uneconomical solutions for transit structures. The procedure used to develop criteria for the design of transit guideways is described. Five transit systems were selected. Load components and their variations were determined. Then, load and resistance factors were calculated. The acceptance criterion was closeness of the calculated liability indices to the target safety level. Safety is measured in terms of a reliability index, and design criteria were developed for the ultimate and serviceability limit states.