Effect of Sustained Overload on the Strength and Plastic Flow of Reinforced Concrete Beams

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Title: Effect of Sustained Overload on the Strength and Plastic Flow of Reinforced Concrete Beams

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

Publication: Journal Proceedings

Volume: 50

Issue: 9

Appears on pages(s): 65-72

Keywords: no keywords

Date: 9/1/1953

Abstract:
Research on the plastic flow of reinforced concrete beams has been in progress at the University of Wisconsin since 1941. Results of several pastprograms have been previously reported, and additional programs are now in progress. This paper presents the test results obtained from overload testsof beams which had previously been subjected to a three-year period of sustained design load. Eighteen beams were tested, involving three conditions of reinforcement in each of three different sizes. The control beam of each pair was tested during a 1-hr period by increasing the uniform load in increments until the ultimate laod was reached. The other beam of each pair was subjected to a high and periodically increased overload for a period of about one year and was then loaded to ultimate. The beams subjected to the high sustained overload suffered considerable plastic flow, but the ultimate strength was not appreciably different from that of companion control beams.