End Anchorage of High Strength Steel Reinforcing Bars

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Title: End Anchorage of High Strength Steel Reinforcing Bars

Author(s): John A. Hribar and Raymond C. Vasko

Publication: Journal Proceedings

Volume: 66

Issue: 11

Appears on pages(s): 875-883

Keywords: anchorage (structural ; bars; bond (concrete to reinforcement) ; hooked reinforcement; pulI-out tests; reinforced concrete; reinforcing steels, research.

Date: 11/1/1969

Abstract:
Pullout tests were conducted to evaluate end anchorage for deformed bars with a nominal yield strength of 60,000 psi (4220 kg/cm2) embedded to conditions approximating those in a semi-infinite medium. Three sizes of bars, #4 (1.3 cm diameter), #7 (2.2 cm), and #11 (3.5 cm) and three types of anchors, straight, right angle hook and semicircular hook, were studied. For a given displacement at the loaded end, the average bond stress increases and the bar stress decreases with increase in bar diameter. Furthermore, the effectiveness of an anchor is a direct function of the concrete strength. Average bond stress appears to be the most useful design criterion.