Applicability of the resistance integration method on bonded fasteners loaded in tension in uncracked concrete under ISO 834-1 fire

Omar Al-Mansouri (1, 2) , Romain Mège (1) , Nicolas Pinoteau (1) , Thierry Guillet (1) , Sébastien Rémond (3)

1 CSTB - Centre Scientifique et Technique du Bâtiment
2 IMT Nord Europe - Ecole nationale supérieure Mines-Télécom Lille Douai
3 GC - Génie Civil

European guidelines for fire design of post-installed anchor systems are limited to mechanical (e.g., expansive, undercut) mechanisms of load transfer and the steel failure mode, whereas the adhesive bond mechanism remains unaccounted for in bonded anchors. Furthermore, current design methods are not based on temperature profiles but rather give a specific resistance for a certain fire duration. This paper presents a study of the applicability of the Resistance Integration Method, proposed originally for Post-Installed Reinforcement (PIR) by Pinoteau, on bonded anchors. This method is validated from comparison of test results obtained from a research project conducted at CSTB on bonded anchors under fire, and calculation. The collected data include tests conducted on anchor sizes of M8 and M12 using epoxy adhesive. Design using Pinoteau's method can be tricky depending on the entry data (numerical calculation of temperature profiles and bond stress vs. temperature relationship adopted in the integration process) and may yield different results (sometimes too conservative) if the wrong parameters are adopted. This paper also presents a study on the influence of these parameters on the outcome of the method. Finally, recommendations are given to ensure good design values for bonded anchors under fire based on the assessment at high temperatures.

Mots clés: adhesive resin; bonded anchor; fire tests; thermal distribution; numerical model

Domaines: Génie civil

Omar Al-Mansouri, Romain Mège, Nicolas Pinoteau, Thierry Guillet, Sébastien Rémond. Applicability of the resistance integration method on bonded fasteners loaded in tension in uncracked concrete under ISO 834-1 fire. 11th International Conference on Structures in Fire (SiF2020), Nov 2020, Brisbane, Australia. ⟨10.14264/b469116⟩. ⟨hal-03508731⟩