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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Bearing Angle Model for Bond of Reinforcing Bars in Concrete
Author(s): Oan Chul Choi and Hajin Choi
Publication: Structural Journal
Appears on pages(s): 245-253
Keywords: bearing angle model; bond (concrete to reinforcement); deformed bars; rib; shearing failure; splitting failure; wedging action
Abstract:The ribs of deformed reinforcing bars can cause bond failure by splitting the concrete cover or by shearing the concrete in front of the ribs. As deformed bars are pulled out, the rib face angle is flattened by the concrete key, which decreases the rib face angle to a smaller bearing angle. Analytical expressions are derived to predict bond forces with respect to splitting and shearing in this paper, and the bearing angle is a key variable. As the bearing angle decreases, the splitting bond strength also decreases, while the shearing bond strength increases. The splitting failure and the shearing failure occur instantaneously and interactively, reaching the ultimate bond strength in the case of bars confined by low transverse reinforcement. The shearing of the concrete key with increasing slip further reduces the splitting bond force, thus lowering the bond stress. The bearing angle model (BAM) is proposed to predict bond strength and to simulate bond failure mechanisms. The behaviors simulated using the proposed support existing knowledge on bonds and earlier experimental observations.
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