Bond and Anchorage


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Title: Bond and Anchorage

Author(s): T.D. Mylrea

Publication: Journal Proceedings

Volume: 44

Issue: 3

Appears on pages(s): 521-552

Keywords: none

Date: 3/1/1948

Pull-out resistance of embedded bars and bond strenghth of bars in simple beams are compared. A study of distribution of bond unit stress, and of safety against bond failure in beams of uniform depth stess, and of safety against bond failure in beams of uniform depth indicates the bond formula is safe in most such beamswith bars extending full length. When all bars are full length, there is a definite relaxation between bar length and diameter, beyond which bond unit stress need not be computed. When steel tension is high, permissible bond unit stress is low. Bar extensions and hooks are evaluated according to efficiency as anchors under high bond stress. Suggestions are made as to length of bearing on supports and cut-off points. It is shown that in wedge-shaped beams, brackets, tapered footings and the like, bond formulas now in use may give deceptively low stresses.