Redistribution of forces in continuous reinforced concrete beams reinforced with cfrp under load
https://doi.org/10.33979/2073-7416-2024-115-5-23-30
Abstract
This article presents the results of experimental studies of bending moment redistribution in two-span continuous reinforced concrete beams reinforced with CFRP under load. Namely, fifteen beams of five series. The first series of beams (СB) are reference specimens without reinforcement. The second series of beams (MSB) included specimens reinforced with CFRP by gluing it to the tension zone in spans with U-shaped anchorage in the support sections without preliminary loading. The third (MSB C), fourth (MSB D) and fifth (MSB E) series of beams are specimens reinforced with CFRP at 30%, 50% and 70% of the expected breaking load of the reference specimens, similar to the second series of beams. To reveal static indeterminacy, readings of support dynamometers were taken at the beginning and end of each stage of the experimental study. Based on the data obtained, average experimental bending moment diagrams for each series were constructed. In addition, the study revealed that carbon fiber reinforcement affects the nature of the redistribution of bending moments in continuous beams, changing the ratio of the support Msu and span Msp moments. Thus, by using an external reinforcement system based on polymer composite materials, it is possible to adjust, if necessary, the nature of the redistribution of bending moments in continuous beams. In particular, by reinforcing the span zones, it is possible to relieve the support.
About the Authors
Ya. L. Obernikhina
Belgorod State Technological University named after V.G. Shukhov
Russian Federation
Russian Federation
Obernikhina Yana L., Senior Lecturer of the Department of Constraction and Urban Economics
Belgorod
G. A. Smolyago
Belgorod State Technological University named after V.G. Shukhov
Russian Federation
Russian Federation
Smolyago Gennadiy A., D.Sc. in Technical Sciences, Professor, Professor of the Department of Constraction and Urban Economics
Belgorod
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Review
For citations:
Obernikhina Ya.L., Smolyago G.A. Redistribution of forces in continuous reinforced concrete beams reinforced with cfrp under load. Building and Reconstruction. 2024;(5):23-30. (In Russ.) https://doi.org/10.33979/2073-7416-2024-115-5-23-30
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