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Strengthening of flat slabs with FRP fan for punching shear
The results of an experimental program on two-way flat slabs with central loading are presented in this paper. All the slabs were designed according to ACI 318-08 code provisions. One slab served as control without any modification while three slabs were strengthened in different ways with an innovative technique of using FRP fans after casting to increase shear capacity and provide sufficient anchorage. For strengthening in each case, 8, 16 and 24 strengtheners were used. The results of the experiments showed that the presented strengthening method is capable of enhancing both maximum loading capacity and deformation capacity as well as avoiding brittle failures that may occur under vertical loading. The dominant failure mode for flat slabs strengthened with FRP fans was deboning of FRP fans due to the small depth of slabs and simultaneously with separation of end anchorage from the concrete surface. It was shown that this method of strengthening not only can increase the shear capacity of the slab up to a high value around twice of that of controlled slab but also may change the slab failure mode from shear to shear–flexural and also flexural. The test results were also compared with the codes predictions to show the efficiency of the presented strengthening. The comparison showed that the ACI 318 code predictions are more conservative than those of JSCE code for results of this study.
Strengthening of flat slabs with FRP fan for punching shear
The results of an experimental program on two-way flat slabs with central loading are presented in this paper. All the slabs were designed according to ACI 318-08 code provisions. One slab served as control without any modification while three slabs were strengthened in different ways with an innovative technique of using FRP fans after casting to increase shear capacity and provide sufficient anchorage. For strengthening in each case, 8, 16 and 24 strengtheners were used. The results of the experiments showed that the presented strengthening method is capable of enhancing both maximum loading capacity and deformation capacity as well as avoiding brittle failures that may occur under vertical loading. The dominant failure mode for flat slabs strengthened with FRP fans was deboning of FRP fans due to the small depth of slabs and simultaneously with separation of end anchorage from the concrete surface. It was shown that this method of strengthening not only can increase the shear capacity of the slab up to a high value around twice of that of controlled slab but also may change the slab failure mode from shear to shear–flexural and also flexural. The test results were also compared with the codes predictions to show the efficiency of the presented strengthening. The comparison showed that the ACI 318 code predictions are more conservative than those of JSCE code for results of this study.
Strengthening of flat slabs with FRP fan for punching shear
Meisami, M.Hasan (author) / Mostofinejad, Davood (author) / Nakamura, Hikaru (author)
Composite Structures ; 119 ; 305-314
2015
10 Seiten, 14 Quellen
Article (Journal)
English
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