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Influence of coiling in stress relaxation of prestressing steel wires

Fecha

2011-06

Autores

Elices, Manuel
Suárez-Guerra, Fernando
Gálvez-Ruíz, Jaime Carlos
Cendón, David Ángel
Atienza, José Miguel

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Resumen

The possible deleterious effects of coiling and long-time 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 like previous residual stresses, long-time storage or storage at high temperatures, can trigger or emphasise this damage to the material. In the authors’ opinion it is recommendable to control the final curvature of the wires after uncoiling prior to prestressing, as required in some Standards.

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Palabras clave

Stress relaxation, Prestressing steel, Coiling diameter

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