FraMCoS 4 2001 Cachan, France

Concretesplittingandbondinprestressedconcretebeamswithindentedwires

The bond between wires and concrete is fundamental to the transmission of stresses between the two materials in prestressed concrete. Indented wires are used to improve the bond. The radial component of the bearing force, increased by Poisson's effect, may…

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Year 2001
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Abstract

The bond between wires and concrete is fundamental to the transmission of stresses between the two materials in prestressed concrete. Indented wires are used to improve the bond. The radial component of the bearing force, increased by Poisson's effect, may split the surrounding concrete. This work presents a novel testing procedure to evaluate the bond-slip between steel and concrete, and its relation to the splitting action of the pretensioned indented wire. The geometry, failure mechanism and mechanical properties are studied. Specimens with three wire indentations and three concrete covers were tested. Also, a numerical pro- cedure is developed to model the bond-slip, taking into account the concrete splitting. The model uses pa- rameters with fully physical meaning, which can be measured experimentally.