Instantaneous and Long-Time Deflections of Reinforced Concrete Beams Under Working Loads

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Title: Instantaneous and Long-Time Deflections of Reinforced Concrete Beams Under Working Loads

Author(s): Wei-Wen yu and George Winter

Publication: Journal Proceedings

Volume: 57

Issue: 7

Appears on pages(s): 29-50

Keywords: none

Date: 7/1/1960

Abstract:
The availability of high strength steels and concretes and the acceptance of ultimate strength design have made it possible to-utilize much shallower flexural members than the wst. The laraer deflections of such members make it imperative for the designer to possess si mple and reliable methods for pre -computing the expected deflections. This refers not only to deflections immediately upon load application, but also, and particularly, to long-time deflections under sustained loads. This paper presents two simple methods, each, for calculating instantaneous and long-time deflections under service loads. The methods are checked against the results of 175 deflection tests from nine different investigations. Agreement is found to be uniformly satisfactory for design purposes.