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Experimental and numerical investigation of two–span RC beams strengthened with fiber–reinforced cementitious matrix (FRCM)
Abstract This paper investigated both experimentally and numerically the flexural performance of two–span beams after being strengthened with polyparaphenylene benzobisoxazole (PBO) fiber–reinforced cementitious matrix (FRCM) systems at different hogging–to–sagging (H/S) strengthening ratios. The test results revealed that the enhancement in the flexural response of the strengthened beams was highly dependent on the strengthening configuration and the number of layers used in both the hogging and sagging sections. The H/S ratio had a notable effect on the failure modes of the hogging sections only whereas the sagging sections showed similar failure modes regardless of the H/S used. Strengthening the sagging sections governed the ductility of the tested beams with a slight effect of the H/S ratio on their ductility. Despite strengthening, the hogging sections were capable to redistribute up to 37% of their moments to the sagging sections, which represented 93% of the redistribution capacity of the unstrengthened sections. This finding suggests the revision of the CSA and ACI formulations that prohibit any moment redistribution in the design of externally–bonded strengthened elements. The developed finite element model accurately predicted the experimental results in terms of the failure modes, the load–carrying capacity, the ductility, and the moment redistribution ratios between the critical sections.
Highlights Using different H/S strengthening ratios change the failure modes of the hogging sections rather than the sagging sections. Strengthening the sagging sections governed the ductility of the beams rather than the hogging strengthening. Strengthened beams can redistribute between 23% and 37% of the moments between their critical sections. It is important to consider the continuity of the FRCM–strengthened structures in the design equations of ACI 549.4 R (2020). The numerical model reasonably predicted the moment redistribution ratios of the beams.
Experimental and numerical investigation of two–span RC beams strengthened with fiber–reinforced cementitious matrix (FRCM)
Abstract This paper investigated both experimentally and numerically the flexural performance of two–span beams after being strengthened with polyparaphenylene benzobisoxazole (PBO) fiber–reinforced cementitious matrix (FRCM) systems at different hogging–to–sagging (H/S) strengthening ratios. The test results revealed that the enhancement in the flexural response of the strengthened beams was highly dependent on the strengthening configuration and the number of layers used in both the hogging and sagging sections. The H/S ratio had a notable effect on the failure modes of the hogging sections only whereas the sagging sections showed similar failure modes regardless of the H/S used. Strengthening the sagging sections governed the ductility of the tested beams with a slight effect of the H/S ratio on their ductility. Despite strengthening, the hogging sections were capable to redistribute up to 37% of their moments to the sagging sections, which represented 93% of the redistribution capacity of the unstrengthened sections. This finding suggests the revision of the CSA and ACI formulations that prohibit any moment redistribution in the design of externally–bonded strengthened elements. The developed finite element model accurately predicted the experimental results in terms of the failure modes, the load–carrying capacity, the ductility, and the moment redistribution ratios between the critical sections.
Highlights Using different H/S strengthening ratios change the failure modes of the hogging sections rather than the sagging sections. Strengthening the sagging sections governed the ductility of the beams rather than the hogging strengthening. Strengthened beams can redistribute between 23% and 37% of the moments between their critical sections. It is important to consider the continuity of the FRCM–strengthened structures in the design equations of ACI 549.4 R (2020). The numerical model reasonably predicted the moment redistribution ratios of the beams.
Experimental and numerical investigation of two–span RC beams strengthened with fiber–reinforced cementitious matrix (FRCM)
Taie, Basma (author) / Mandor, Ahmed (author) / El Refai, Ahmed (author)
Engineering Structures ; 300
2023-11-25
Article (Journal)
Electronic Resource
English
Continuous beams , Composites , FRCM , Hogging , Sagging , Seismic , Strengthening , Repair , Ductility , Moment redistribution
Flexural Strengthening of RC beams using Fiber Reinforced Cementitious Matrix, FRCM
| BASE | 2017
| British Library Conference Proceedings | 2009