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Experimental and Theoretical Analysis of Crack Resistance and Deformability of Concrete Beams Reinforced with Fiber-Reinforced Polymer Bars
Along with the known advantages, high tensile strength, low specific density, high fastness to staining and low thermal conductivity, fiber-reinforced polymers (FRP) reinforcement bars have a number of features and disadvantages. One of the main is the relatively low modulus of elasticity compared to steel. As a result, elements with FRP reinforcement have a higher deformability. In this regard, the requirements of the service limit states imposed on structures may become the main obstacle to the use of FRP for reinforcing concrete members. Experimental studies were carried out taking into account and observing the provisions of GOST 8829-2018. Concrete beam specimens were 120 × 220 mm in cross section and 1810 mm in length, reinforced with two bars in a tension side. The beams were reinforced longitudinally with steel, glass fiber-reinforced polymer (GFRP) and basalt fiber-reinforced polymer (BFRP) bars. The value of the reinforcement ratio varied. Methods for calculating the crack width of guidelines are considered: Russia—Construction rules and regulations 63.13330.2012 and 295.1325800.2017, USA—ACI 440.1R-06. The results of theoretical and experimental studies of the crack resistance of flexural members with FRP reinforcement are obtained. Differences in the considered design methods are revealed. Deviations of theoretical data from experimental data are determined. Inaccurate determination of the cracking moment Mcrc has a negative impact on the results of calculating the deflection of flexural members with FRP. Features of crack formation in members with FRP reinforcement are recorded, which call into question the possibility of using the design methods by Construction rules and regulations 63.13330.2012 and 295.1325800.2017. Corrected equations for calculating the cracking moment and the crack width are proposed. In the equation for calculating the crack opening width, a coefficient is introduced that takes into account the influence of the diameter of the rods.
Experimental and Theoretical Analysis of Crack Resistance and Deformability of Concrete Beams Reinforced with Fiber-Reinforced Polymer Bars
Along with the known advantages, high tensile strength, low specific density, high fastness to staining and low thermal conductivity, fiber-reinforced polymers (FRP) reinforcement bars have a number of features and disadvantages. One of the main is the relatively low modulus of elasticity compared to steel. As a result, elements with FRP reinforcement have a higher deformability. In this regard, the requirements of the service limit states imposed on structures may become the main obstacle to the use of FRP for reinforcing concrete members. Experimental studies were carried out taking into account and observing the provisions of GOST 8829-2018. Concrete beam specimens were 120 × 220 mm in cross section and 1810 mm in length, reinforced with two bars in a tension side. The beams were reinforced longitudinally with steel, glass fiber-reinforced polymer (GFRP) and basalt fiber-reinforced polymer (BFRP) bars. The value of the reinforcement ratio varied. Methods for calculating the crack width of guidelines are considered: Russia—Construction rules and regulations 63.13330.2012 and 295.1325800.2017, USA—ACI 440.1R-06. The results of theoretical and experimental studies of the crack resistance of flexural members with FRP reinforcement are obtained. Differences in the considered design methods are revealed. Deviations of theoretical data from experimental data are determined. Inaccurate determination of the cracking moment Mcrc has a negative impact on the results of calculating the deflection of flexural members with FRP. Features of crack formation in members with FRP reinforcement are recorded, which call into question the possibility of using the design methods by Construction rules and regulations 63.13330.2012 and 295.1325800.2017. Corrected equations for calculating the cracking moment and the crack width are proposed. In the equation for calculating the crack opening width, a coefficient is introduced that takes into account the influence of the diameter of the rods.
Experimental and Theoretical Analysis of Crack Resistance and Deformability of Concrete Beams Reinforced with Fiber-Reinforced Polymer Bars
Lecture Notes in Civil Engineering
Vatin, Nikolai (Herausgeber:in) / Mirsayapov, Ilshat (Autor:in) / Antakov, Igor (Autor:in) / Antakov, Alexey (Autor:in)
International Scientific Conference on Socio-Technical Construction and Civil Engineering ; 2022 ; Kazan, Russia
30.09.2022
24 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
Building , Construction , Non-metallic reinforcement , Fiber-reinforced polymer reinforcement , Concrete structures , Flexural members , Crack width , Concrete beam , Glass fiber-reinforced polymer reinforcement , Basalt fiber-reinforced polymer reinforcement Engineering , Construction Management , Building Construction and Design , Regional/Spatial Science
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