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A platform for research: civil engineering, architecture and urbanism
Experimental Test Methodology for Moment Redistribution in Statically Indeterminate FRC Beams
Moment redistribution in structures is crucial for ensuring the safety, resilience, and efficiency of a building. There are few studies that address this phenomenon in fibre reinforced concrete (FRC), both with and without reinforcing bars. These studies used a two-span, one-way, continuous beam set-up, with point loads on each span. Although the system is, in theory, symmetric, the response is not symmetric due to differences in geometry, materials, and experimental errors. Therefore, a plastic hinge usually forms on only one of the two spans, in addition to the one over the central support. The asymmetric response makes the analysis cumbersome. In this paper, a different methodology for testing statically indeterminate FRC beams is presented. In it, a partially restrained support is materialized at both ends of a one-span beam. The configuration is completely described, which includes: load cells in the supports; LVDTs for midspan deflection, for the support rotation, and for crack opening displacements (COD); and Digital Image Correlation also for COD. Preliminary results of a beam tested in this configuration are shown and advantages and disadvantages are analyzed compared to the two-span, continuous beam set-up. Although the analysis of the proposed set-up is more straightforward, the rotational stiffness (κ) of the partially re-strained supports (defined as the relationship between the moment (M) and the angle of rotation (θ): κ = M/θ) should be carefully defined in the system to reflect the real behavior of FRC continuous members.
Experimental Test Methodology for Moment Redistribution in Statically Indeterminate FRC Beams
Moment redistribution in structures is crucial for ensuring the safety, resilience, and efficiency of a building. There are few studies that address this phenomenon in fibre reinforced concrete (FRC), both with and without reinforcing bars. These studies used a two-span, one-way, continuous beam set-up, with point loads on each span. Although the system is, in theory, symmetric, the response is not symmetric due to differences in geometry, materials, and experimental errors. Therefore, a plastic hinge usually forms on only one of the two spans, in addition to the one over the central support. The asymmetric response makes the analysis cumbersome. In this paper, a different methodology for testing statically indeterminate FRC beams is presented. In it, a partially restrained support is materialized at both ends of a one-span beam. The configuration is completely described, which includes: load cells in the supports; LVDTs for midspan deflection, for the support rotation, and for crack opening displacements (COD); and Digital Image Correlation also for COD. Preliminary results of a beam tested in this configuration are shown and advantages and disadvantages are analyzed compared to the two-span, continuous beam set-up. Although the analysis of the proposed set-up is more straightforward, the rotational stiffness (κ) of the partially re-strained supports (defined as the relationship between the moment (M) and the angle of rotation (θ): κ = M/θ) should be carefully defined in the system to reflect the real behavior of FRC continuous members.
Experimental Test Methodology for Moment Redistribution in Statically Indeterminate FRC Beams
RILEM Bookseries
Mechtcherine, Viktor (editor) / Signorini, Cesare (editor) / Junger, Dominik (editor) / Segura-Castillo, L. (author) / Leites, R. (author) / Saura, M. (author) / Pieralisi, R. (author)
RILEM-fib International Symposium on Fibre Reinforced Concrete ; 2024 ; Dresden, Germany
Transforming Construction: Advances in Fiber Reinforced Concrete ; Chapter: 27 ; 212-219
RILEM Bookseries ; 54
2024-09-12
8 pages
Article/Chapter (Book)
Electronic Resource
English
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