Abstract
An analytical approach was proposed to predict the maximum pull-out load of steel bar from concrete, which is then related to the local fracture energy at the shear crack-tip region. Based on the comparisons between the analytically predicted and experimentally determined maximum pull-out loads under two extreme conditions, i.e., maximum crack-tip bridging with maximum fracture energy and zero crack-tip bridging with minimum fracture energy, the crack-tip local fracture energy indeed varies with the initial shear crack length. A tri-linear model was presented to well describe the local shear fracture energy distribution along the embedment length indicating the boundary effect.
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