Abstract
The aim of this study was to investigate experimentally behavior of uncorroded monostrand tendons with broken wires and assess the range of application of assessment procedures used in practice, such as screwdriver penetration tests. Six tests of unbonded 7-wire monostrand tendons with 1 or 2 broken outer wires are documented. Specimens with 9, 13, and 15 mm diameters were tested using an 18.3 m strongback beam simulating the load and boundary constraints typical of an unbonded, posttensioned concrete slab. Remaining prestress fraction measurements and strain distributions along the length of the broken and unbroken wires were obtained for each test. It was observed that: strains in broken wires of tendons with 2 diametrically opposed broken wires were equal at each cross section and decreased with distance from the break; strains in unbroken wires of tendons with a single break were not equal at each cross section, with maximum strains in the 2 wires adjacent to the broken wire; and the remaining prestress force is greatly increased by inter-wire friction.
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