Evaluation of Bond Performance in Reinforced Concrete Structures


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Title: Evaluation of Bond Performance in Reinforced Concrete Structures

Author(s): S. L. McCabe and S. J. Pantazopoulou

Publication: Special Publication

Volume: 180


Appears on pages(s): 1-22

Keywords: Anchorage; bond; bond models; design; detailing; development; finite element method; plasticity; reinforcement

Date: 10/1/1998

The increasing significance of performance-based criteria in modem structural design has motivated new considerations in bond design of conventional reinforcing steels, relating to more reliable assessment of both the demand and the supply sides of the anchorage/development design problem. Accurate identification of the required anchorage lengths needed to ensure strain compatibility, by proper consideration of the conditions affecting bond, is necessary to limit slippage of the steel relative to the concrete. While minimum development lengths calculated by designers imply that the bar is fully anchored, it is well established by experimental observation that in practice there is always some bar slip. Recent research results from around the world provide the basis for improved understanding of the effects on bond performance of critical parameters such as confinement, spacing, and material properties. Much of this work has been empirical in nature and the applicability of empirical design expressions in calculations is limited. Nonlinear finite element calculations and other sophisticated analysis re-quires more information as to how the bond failure proceeds than simply an upper limit. This paper will summarize the available information that exists both within North America through AC1 and within the CEB as to the viable approaches and philosophies that can be applied to the bond problem. The range of application of the various techniques will be identified as will limitations and needs for more re-search.


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