Lateral Stablity of Reinforced Concrete Beams

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Title: Lateral Stablity of Reinforced Concrete Beams

Author(s): William Hansell and George Winter

Publication: Journal Proceedings

Volume: 56

Issue: 9

Appears on pages(s): 193-214

Keywords: none

Date: 9/1/1959

Abstract:
Some concrete design specifications, including the ACI Code, in various ways limit the distance between lateral supports of beams, presumably to safeguard against lateral buckling. Th e present investigation is intended to furnish some factual information on which to base such provisions. Ten tests on deep narrow beams have been carried out with unbraced lengths ranging from 28.8 to 86.4 times the beam width. No reduction in strength was observed over this ran e, showing the absence of lateral buckling. A tentative t h crete beams, eory of lateral instability of reinforced con- including the effects of inelasticity and cracking, is given. It agrees with the tests in showing that present Code provisions are too restrictive, particularly for ordinary steel strengths. Theory indicates that closer lateral supports are required for high strength reinforced beams than for ordinary strength reinforcement.