Influence of Reinforcement Size and Distribution on Deflections of RC Members


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Title: Influence of Reinforcement Size and Distribution on Deflections of RC Members

Author(s): M. A. Polak, K. G. Blackwell, and D. T. Killen

Publication: Special Publication

Volume: 210


Appears on pages(s): 19-36

Keywords: bond; crack spacing; deflections; reinforcement size; tests

Date: 2/1/2003

The paper presents analysis of results from fourteen full-size tests on reinforced concrete members subject to different ratios of bending and in-plane loads. The tests examined the influence of bond between concrete and reinforcement on the deflections and cracking of the members. The parameters in the test program included reinforcing bar diameter, ratio of in-plane to bending loadings, reinforcement ratio and concrete cover. Two types of specimens were involved: one set with a larger number but smaller diameter bars, and one with a smaller number but larger diameter bars. Since reinforcement sized varied, the bond characteristics of these bars varied, leading to different load-deflection responses. The test results showed that different longitudinal reinforcement configurations, for the same reinforcement ratio and the same loading and boundary conditions, result in different cracking loads, post-cracking stiffness and deflections.