FraMCoS 5 2004 Vail, Colorado, USA

Local Bond Stress-Slip Law and Size Effect in High-Bond Bars

The local bond-stress/slip law is worked out taking into account size effect, which appears in the formulation of the maximum bond stress, through the bar diameter. To this purpose, a number of pull- out and push-in tests on short deformed…

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Year 2004
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Abstract

The local bond-stress/slip law is worked out taking into account size effect, which appears in the formulation of the maximum bond stress, through the bar diameter. To this purpose, a number of pull- out and push-in tests on short deformed bars, embedded in concrete cylinders, were performed and their results turned out to be in very good agreement with Baå ant’s size-effect law, both in normal-strength and high-performance concrete. All 50 specimens were highly-confined by means of steel jackets, to prevent or control cover splitting, and to check to what extent passive confinement affects bond capacity. The proposed local bond stress-slip law (a) fully agrees with MC 90 Code and with some later proposals, (b) fits quite well the available test results on short, well-enrobed anchored bars, and (c) may be easily introduced into design-oriented codes.