Plastic Flow (Creep*) of Reinforced Concrete Continuous Beams


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Title: Plastic Flow (Creep*) of Reinforced Concrete Continuous Beams

Author(s): G. W. Washa and P. G. Fluck

Publication: Journal Proceedings

Volume: 52

Issue: 1

Appears on pages(s): 549-561

Keywords: no keywords

Date: 1/1/1956

Previous investigations have provided information about plastic flow behavior of single-span reinforced concrete beams, and have shown the beneficial effect of compressive reinforcement in reducing plastic flow. This paper presents the results of 2 1/2 years of loading of two-span beams resting on three level supports. Eighteen beams were tested, representing three different conditions of reinforcement in rach of three beam sizes. Inclusion of arbitrary amounts of compressive steel in positive moment regions or two-span continuous beams is effective in reducing plastic flow deflection. Specifically, inclusion of compressive steel equal in amount to the tensile steel reduced plastic flow deflection by about one-third. Plastic flow in positive moment regions of each beam was accompanied by an increase in the midlength reaction and a corresponding increase in midlength bending moment.