Floating Bridge Drawspan Maintenance

by Colin B. Brown, (M.ASCE), Prof. of Civ. Engrg.; Univ. of Washington, Seattle, Wash., 98195,
Ramiah Vasu, Research Asst.; Orthopaedic Research Lab., Massachusetts General Hospital, Boston, Mass.,
Michael A. Landy, Aerospace Engr.; Structures Div. ASD/ENF, Wright Paterson Air Force Base, Ohio.,
John W. Heavner, Research Asst.; Dept. of Civ. Engrg., Univ. of Washington, Seattle, Wash., 98195,
Derald R. Christensen, Research Assoc.; Dept. of Civ. Engrg., Univ. of Washington, Seattle, Wash., 98195,

Serial Information: Journal of the Structural Division, 1981, Vol. 107, Issue 11, Pg. 2127-2146

Document Type: Journal Paper


A methodology for making maintenance decisions to avoid fatigue failure is proposed. The maintenance procedures developed for the drawspan mechanism of the Evergreen Point Bridge are used as an illustration of the methodology. The methodology includes, development of the stress/environment relationship for the critical member, collection of long-term environmental data and the computation of long-term stress distribution, determination of cycles at each stress level from the return period, and duration of various environmental conditions and the member frequency at the associated stress level, determination of the fatigue characteristics of the member (S-N) from a limited number of full-scale tests using the Prot procedure, and determination of yearly damage and, life expectancy using Miner's hypothesis.

Subject Headings: Bascule bridges | Bridge management | Maintenance | Fatigue tests | Environmental issues | Stress distribution | Fatigue life | Failure analysis

Services: Buy this book/Buy this article


Return to search