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Long term behavior of prestressed and partially prestressed concrete beams: Experimental and numerical results

par Espion, Bernard ;Halleux, Pierre
Référence Publication SP, SP-129, page (19-38)
Publication Publié, 1991-12

Article révisé par les pairs

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Résumé :

Synopsis: Tests results from long-term experiments on prestressed and partially prestressed concrete beams are reported. Tests were carried out on 10 rectangular beams spanning 8 m and undergoing sustained loading for five years. After that time, there was no evidence of stabilization of the time-dependent behavior of concrete. Numerical modeling of the deformation of the midspan section explains experimental observations and confirms that the presence of ordinary reinforcing steel in a prestressed concrete section leads to a redistribution of stresses between concrete and steel which should be taken into account in serviceability limit states computations. Tests to failure of the beams at five years yield no significant differences in carrying capacity with tests executed at an early age. It is suggested that the deflection limit state is a major consideration in design and that the degree of prestressing should be chosen in function of ratio of permanent load to total design load (permanent and l i v e).