Deflection and Cracking of Reinforced Concrete Under Repeated Loading and Fatigue

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Title: Deflection and Cracking of Reinforced Concrete Under Repeated Loading and Fatigue

Author(s): J. M. Lovegrove and Salah El Din

Publication: Special Publication

Volume: 75

Issue:

Appears on pages(s): 133-152

Keywords: beams (supports); cracking (fracturing); crack width and spacing; cyclic loads; deflection; deformation; fatigue (materials); fatigue tests; reinforced concrete; research; structural design.

Date: 9/1/1982

Abstract:
Reinforced concrete beams of different sizes and reinforcement arrangements were repeatedly loaded at frequencies of 0.5 and 1 Hz. Curvature and deflection are presented as ratios of the initial values and a unique relation is obtained between each of these ratios and the logarithm of the number of load repetitions. Each ratio increases gradually in a curved form to about 0.5 x l06 repetitions from where it takes a straight line form with a slope varying between 0.2 and 0.225. The long term deflections of beams tested in earlier investigations are predicted with good agreement. A similar expression is given for maximum crack width and predicted long term values are in reasonable agreement with those measured by earlier investigators.