Advances in Short Span Steel Bridges

by Geerhard Haaijer, (M.ASCE), Vice Pres. & Dir. of Engrg.; American Institute of Steel Construction, Chicago, Ill.,

Serial Information: Civil Engineering—ASCE, 1985, Vol. 55, Issue 11, Pg. 45-47

Document Type: Feature article


Applying recent research to the design of short span steel bridges can lower their cost and maintenance. Such research involves improved limit state criteria, more uniform lateral load distribution, wider spacing of beams and girders, prefabricated composite units, improved bearings and elimination of joints. The proposal to improve limit state criteria in the load factor design (LFD) method considers three levels of loading: service load, overload and maximum load. A proposed design method, called autostress design (ASD) permits a continuous span bridge to undergo small plastic deformations at a pier that will stabilize after a few cycles, then respond elastically to all subsequent loads not exceeding the overload.

Subject Headings: Lateral loads | Load distribution | Bridge design | Maximum loads | Service loads | Steel bridges | Plastic design | Span bridges

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