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Leheigh Universitys Khan Lecture Series, Part 3  
Location: Bethlehem PA
Date: April 18, 2008 - April 18, 2008
Overcoming Barriers to Durable Steel Bridge Systems
Friday, April 18, 2008
4:10 P.M.
Leheigh University
Sinclair Laboratory Auditorium

Overview:
Experience with steel bridges has demonstrated that one of the primary barriers to durability was inadequacies in the fatigue design criteria and practice prior to 1974. The development of a rational fatigue resistance knowledge base and the introduction of stress range as the appropriate fatigue design criteria minimized this limitation. [...] More recent work on Ultrasonic Impact Treatment (UIT) together with the need for end weld design changes are shown to effectively eliminate fatigue as controlling design.

For the future, High Performance Steels (HPS) are providing enhanced weathering resistance for uncoated members along with more reliable fracture resistance and weldability. Control of water and debris by minimizing joints in bridge decks offers enhanced protection for both coated and uncoated bridge members. The orthotropic steel deck is shown to be a system providing modularity for prefabrication and easy erection. This system is capable of providing a 100 year life when thicker deck plates are used with thin epoxy concrete wearing surfaces. These have been shown to permit immediate use and are not pot hole sensitive even if local surface deterioration develops.

Presenter:
JOHN W. FISHER, Professor Emeritus of Civil Engineering
Director Emeritus, ATLSS Engineering Research Center
Lehigh University, Bethlehem, Pa.

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