Creep loading influence on the residual capacity of concrete structure : Experimental investigation

Mirvat Omar (1) , Khalil Haidar (1) , Ahmed Loukili (1) , Gilles Pijaudier-Cabot (1)

1 GeM - Institut de Recherche en Génie Civil et Mécanique

Recent experiences and results investigating flexural creep tests with various loading levels are presented. The aim of the study is to analyse the influence of creep on the residual capacity of concrete beams. The load level effects on creep strain are also discussed. Results show that for bending beams subjected to 60% of their load capacity during 40 days, the residual carrying capacity is reduced about 20%. This effect is essentially due to drying creep. Basic creep experiments show that for high load levels there is a coupled effect between creep and damage as tertiary creep is observed. Acoustic emission analyses underline also that damage occurs during creep. These results, which include size effect fracture tests, may serve for the development and the validation of coupled creep-damage models.

Mots clés: flexural creep; loading level; residual capacity; acoustic emission

Domaines: Mécanique [physics.med-ph]; Matériaux

Mirvat Omar, Khalil Haidar, Ahmed Loukili, Gilles Pijaudier-Cabot. Creep loading influence on the residual capacity of concrete structure : Experimental investigation. Fifth International Conference on Fracture Mechanics of Concrete and Concrete Structures, 2004, Vail, United States. ⟨hal-01008045⟩