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Influence of coiling on the stress relaxation of prestressing steel wires
Elices Calafat, Manuel and Suárez Guerra, Fernando and Gálvez Ruíz, Jaime and Cendón Franco, David Angel and Atienza Riera, José Miguel
Influence of coiling on the stress relaxation of prestressing steel wires.
"Structural Concrete", v. 12
The possible deleterious effects of coiling and long-term storage of coiled wires on the stress relaxation behaviour of prestressing steel wires has been checked by means of experimental work and a simple analytical model. The results show that if the requirements of standards are fulfilled (minimum coiling diameters), these effects can be neglected. However, some other factors, such as previous residual stresses, long-term storage or storage at high temperatures, can trigger or emphasize this damage to the material. In the authors' opinion, checking the final curvature of the wires after uncoiling prior to prestressing, as required in some standards, is to be recommended.
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