Confinement Role in Anchorage Capacity

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Title: Confinement Role in Anchorage Capacity

Author(s): E. Giuriani and G. A. Plizzari

Publication: Special Publication

Volume: 180

Issue:

Appears on pages(s): 171-194

Keywords: Anchorage; bond strength; bond stress; cracking (fracturing); stirrups

Date: 10/1/1998

Abstract:
In the present paper, the role of the confining forces both on bond capacity and on splitting crack opening under service loads is shown. In par-ticular, theoretical relationships between the transverse reinforcement area, the bond strength, the splitting crack opening and the stirrup stress are pre-sented. The theoretical predictions are contrasted with some experimental results and a discussion on the values provided by building codes is presented. The results show the strong influence of transverse reinforcement whose confining force is expressed by the stirrup index of confinement, which gov-erns bond behavior and is suitable for design. The comparison with several experimental results showed a good agreement between theory and tests. Adequate values of Q are also required to control splitting crack opening under service loads. For common amounts of transverse reinforcement, the splitting crack opening can be larger than one half of the flexural crack, which could be unacceptable for structural durability.