Experimental Research on Concrete Beams Reinforced with High Ductility Steel Bars and Strengthened with a Reactive Powder Concrete Layer in the Compression Zone
| Autor: | D. Frączek, Aneta Matuszek-Chmurowska, Krystian Jurowski, Karolina Tatara, Stefania Grzeszczyk, Bronisław Jędraszak, Mariusz Czabak, Zbigniew Perkowski |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
displacement measurement 0211 other engineering and technologies Hinge 020101 civil engineering photogrammetric analysis 02 engineering and technology Bending Curvature lcsh:Technology ultrasonic tests Article 0201 civil engineering composite beam 021105 building & construction General Materials Science strain measurement Composite material lcsh:Microscopy Ductility destructive tests Concrete cover lcsh:QC120-168.85 lcsh:QH201-278.5 lcsh:T ultra-high performance fibre reinforced concrete Delamination reactive powder concrete curvature measurement reinforcing steel of high ductility Compression (physics) lcsh:TA1-2040 Reference beam lcsh:Descriptive and experimental mechanics cracks lcsh:Electrical engineering. Electronics. Nuclear engineering lcsh:Engineering (General). Civil engineering (General) lcsh:TK1-9971 |
| Zdroj: | Materials Volume 13 Issue 18 Materials, Vol 13, Iss 4173, p 4173 (2020) |
| ISSN: | 1996-1944 |
| DOI: | 10.3390/ma13184173 |
| Popis: | The article describes four-point bending tests of three reinforced concrete beams with identical cross-sections, spans, and high-ductility steel reinforcement systems. Two beams were strengthened in the compressed section with a thin layer of reactive powder concrete (RPC) bonded with evenly spaced stirrups. Their remaining sections, and the third reference beam, were made of ordinary concrete. Measurements of their deflections, strains and axis curvature ultrasonic tests and a photogrammetric analysis of the beams are the main results of the study. For one of the beams with the RPC, the load was increased in one stage. For the two remaining beams, the load was applied in four stages, increasing the maximum load from stage to stage in order to allow the analysis of the damage evolution before reaching the bending resistance. The most important effect observed was the stable behaviour of the strengthened beams in the post-critical state, as opposed to the reference beam, which had about two to three times less energy-absorbing capacity in this range. Moreover, thanks to the use of the RPC layer, the process of concrete cover delamination in the compression zone was significantly reduced, the high ductility of the rebars was fully utilized during the formation of plastic hinges, and the bending capacity was increased by approximately 12%. |
| Databáze: | OpenAIRE |
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