Ocena stanów naprężenia i odkształcenia w belkach z betonu zbrojonego prętami z włókien bazaltowych

Marek Urbański

Abstract

The subject of the PhD thesis is an assessment of the impact of basalt fiber use on the state of stresses and deformations of bent concrete beams. At the outset of work, a thesis on the possibility of replacing traditional steel bars with BFRP reinforcement has been proposed, which may a beneficial influence on the load-bearing capacity and deformability of the reinforced beams. Based on a literature review, their mechanical properties of FRP bars have been described. The disadvantages and advantages of BFRP bars against other types of FRP and steel reinforcements are also presented. In the dissertation, the problems related to the testing of tensile strength of basalt bars were characterized, with particular attention to the anchoring system of these bars during the tests. The current state of knowledge about FRP grip bond to concrete and bending behavior, concrete reinforced with these bars has been discussed. The analysis of the information obtained from the review of the literature allowed us to define the purpose and plan of our own research, which was carried out in three stages. In the first study, six beam beams with a span of 1.0 m, reinforced with BFRP bars of 8 mm in diameter and conventional steel bars of the same diameter were bored. On the basis of the obtained results, a comparative analysis of the load capacity and cracks and deflections of the tested beams were made. In the second stage of the work, have been made comparative tests of the bond of BFRP bars and steel bars to concrete in order to confirm the suitability of basalt reinforcement for use in bending elements. The results of the bond tests were analyzed with particular regard to the bond - slip nature. Based on the experience of dependencies, they also have been used to analyze the degree of calibration of selected computational models (e.g. CMR and mBEP). In order to verify the obtained results on short beams, the study of twelve long beam lengths of 3 m with different diameters and reinforcement was conducted in stage III. The mechanical properties of used materials, bearing capacity, bond and cracks and deflections of the tested beams were analyzed. The conclusions were presented with reference to steel reinforcement. In the following part of the dissertation, the algorithm for calculating beams with reinforcement BFRP was presented. The results of the research and analysis allowed to determine the criteria for the application of reinforcement BFRP in beams and its effect on their load capacity and deformability. On the basis of the three-phase studies, has been formulated a conclusion to reach the aim of the PhD thesis and to prove the thesis at the beginning of the dissertation. Namely it has been demonstrated that under certain conditions (including ensuring a sufficient number of bars, due to the SLS criterion), the use of BFRP reinforcement has a beneficial effect on the bearing capacity and deformability of RC members and may be an appropriate alternative to conventional steel reinforcement. The research and analysis of reinforced bar beams and BFRP bars presented in the PhD Thesis has been carried out within the framework of the project: "Innovative Measures and Effective Methods for Improving Safety and Sustainability of Buildings and Transport Infrastructure in a Sustainable Development Strategy" funded by the European Union: POIG.01.01.02-10-106/09-01 (PT2.3).2012/2013 and within the statutory works of the Faculty of Civil Engineering of the Warsaw University of Technology. The study is a starting point for further work under PBS3/A2/20/2015. "Innovative Hybrid FRP Composite Reinforcement for Infrastructure of Increased Durability". The PhD Thesis consists of 283 pages, 132 figures, 59 tables and two attachments covering a total of 59 pages. The list of references contains 193 items.
Diploma typeDoctor of Philosophy
Author Marek Urbański (FCE / ICE)
Marek Urbański,,
- The Institute of Civil Engineering
Title in PolishOcena stanów naprężenia i odkształcenia w belkach z betonu zbrojonego prętami z włókien bazaltowych
Languagepl polski
Certifying UnitFaculty of Civil Engineering (FCE)
Disciplineconstruction / (technology domain) / (technological sciences)
Start date19-12-2012
Defense Date05-09-2017
End date06-09-2017
Supervisor Elżbieta Danuta Szmigiera (FCE / ICE)
Elżbieta Danuta Szmigiera,,
- The Institute of Civil Engineering

External reviewers Marta Kosior-Kazberuk
Marta Kosior-Kazberuk,,
-

Krystyna Nagrodzka-Godycka
Krystyna Nagrodzka-Godycka,,
-
Pages283
Keywords in Englishbasalt rebars, BFRP, flexuralcapacity, reinforced concrete, bond
Abstract in EnglishThe subject of the PhD thesis is an assessment of the impact of basalt fiber use on the state of stresses and deformations of bent concrete beams. At the outset of work, a thesis on the possibility of replacing traditional steel bars with BFRP reinforcement has been proposed, which may a beneficial influence on the load-bearing capacity and deformability of the reinforced beams. Based on a literature review, their mechanical properties of FRP bars have been described. The disadvantages and advantages of BFRP bars against other types of FRP and steel reinforcements are also presented. In the dissertation, the problems related to the testing of tensile strength of basalt bars were characterized, with particular attention to the anchoring system of these bars during the tests. The current state of knowledge about FRP grip bond to concrete and bending behavior, concrete reinforced with these bars has been discussed. The analysis of the information obtained from the review of the literature allowed us to define the purpose and plan of our own research, which was carried out in three stages. In the first study, six beam beams with a span of 1.0 m, reinforced with BFRP bars of 8 mm in diameter and conventional steel bars of the same diameter were bored. On the basis of the obtained results, a comparative analysis of the load capacity and cracks and deflections of the tested beams were made. In the second stage of the work, have been made comparative tests of the bond of BFRP bars and steel bars to concrete in order to confirm the suitability of basalt reinforcement for use in bending elements. The results of the bond tests were analyzed with particular regard to the bond - slip nature. Based on the experience of dependencies, they also have been used to analyze the degree of calibration of selected computational models (e.g. CMR and mBEP). In order to verify the obtained results on short beams, the study of twelve long beam lengths of 3 m with different diameters and reinforcement was conducted in stage III. The mechanical properties of used materials, bearing capacity, bond and cracks and deflections of the tested beams were analyzed. The conclusions were presented with reference to steel reinforcement. In the following part of the dissertation, the algorithm for calculating beams with reinforcement BFRP was presented. The results of the research and analysis allowed to determine the criteria for the application of reinforcement BFRP in beams and its effect on their load capacity and deformability. On the basis of the three-phase studies, has been formulated a conclusion to reach the aim of the PhD thesis and to prove the thesis at the beginning of the dissertation. Namely it has been demonstrated that under certain conditions (including ensuring a sufficient number of bars, due to the SLS criterion), the use of BFRP reinforcement has a beneficial effect on the bearing capacity and deformability of RC members and may be an appropriate alternative to conventional steel reinforcement. The research and analysis of reinforced bar beams and BFRP bars presented in the PhD Thesis has been carried out within the framework of the project: "Innovative Measures and Effective Methods for Improving Safety and Sustainability of Buildings and Transport Infrastructure in a Sustainable Development Strategy" funded by the European Union: POIG.01.01.02-10-106/09-01 (PT2.3).2012/2013 and within the statutory works of the Faculty of Civil Engineering of the Warsaw University of Technology. The study is a starting point for further work under PBS3/A2/20/2015. "Innovative Hybrid FRP Composite Reinforcement for Infrastructure of Increased Durability". The PhD Thesis consists of 283 pages, 132 figures, 59 tables and two attachments covering a total of 59 pages. The list of references contains 193 items.
Thesis file
Urbanski.pdf 13.19 MB

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