Fracture toughness of RC beams with different shear span

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Main parameters, which characterize shear strength, are crack distribution, width of diagonal crack opening and angle of inclined crack. There are in this article, comparison crack resistant of testing reinforced concrete (RC) beams on the shear with such variable parameters like presence or absence internal reinforcement, different shear span, and presence or absence external composite reinforcement. Shear span (relative span to effective depth ratio) was acquired the following values: a/d=2, 1.5, 1. For internal reinforcement, rebar’s A240C with diameter 8 mm and steps 100 mm was chosen. The composite FRCM system was like external reinforcement with three stripe of composite fabric with width 70 mm and step 100 mm. Eight RC beams were tested. After testing, we discovered that the most influenced on the serviceability capacity was shear span. Internal transverse reinforcing increased shear strength on the same level and it was independent from shear span and other factors. Only quantity of reinforcing determine level of increasing shear capacity. FRCM system is efficient strengthening system, which significant increase shear crack resistant for RC beams. External FRCM reinforcing increase shear crack resistance on the same percentage and independent from presence or absence internal reinforcement.

Section: The Overview Of Testing Rc Beams Without Internal Transversementioning

confidence: 89%

Comparison Crack Resistance of RC Beams with and without Transverse Reinforcement after Shear Testing

Vegera

Khmil

Vashkevych

et al. 2019

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“…Reinforced concrete constructions are one of the most popular materials for the present time and its study is constantly engaged (Bobalo, et al, 2018;Fadhil et al, 2018;Khmil et al, 2018;Koz, 2017;Al Saffar et al, 2019;Sobol, el al., 2014). Often, as a result of increasing design requirements or increasing of seismic resistance (Kramarchuk et al, 2018), such structures need to be repair and strengthen (Brózda et al, 2017;Vegera et al, 2018;Tayeh et al, 2013). Reinforced concrete constructions of buildings and structures with aggressive environment are exploited under difficult conditions (Selejdak et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Corrosion of RC Beams During Time

Blikharskyy

Khmil

Blikharskyy

2019

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This article presented results of impact corrosion on reinforce concrete beams during time with previous loading. Before testing the RC beams were loaded by 37% and 75% from bearing-capacity load of undamaged corrosion beams. There were tested two types of beams. First type beams were tested under force loading action and second type beams were tested under force loading and corrosion action. As an aggressive environment were used the 10% solution of sulfuric acid H2SO4. Such environment takes place in separate chemical manufactures, galvanic workshops, flue pipes of thermal power plants. The results of experimental studies have established that the effect of the aggressive environment with simultaneous loading significantly impairs the stress-strain state of reinforced concrete beams. Bearing capacity due to the yielding of reinforcement bars for specimens with the simultaneous action of aggressive environment and previous loading of 37% and 75% takes place on 51…53 and 58…60 days. The destruction of these specimens, by crushing compressive concrete, at previous loading 37% occurred after 75…79 and at previous loading 75% - after 79…88 days. The history loading does not impact significantly on beams failure, on finite deflections and timing exhaustion bearing capacity since the start of the simultaneous action of aggressive environment and loading.

“…To date, many research have been conducted in the field of concrete mechanical properties improvement (Al Saffar et al, 2019;Fadhil et al, 2018;Sobol et al, 2014;Tayeh, et al, 2013;Abu-Tair, et al, 1996). Low reliability and insufficient bearing capacity of reinforced concrete structures is often a result of faults in manufacturing process and design (Koz, et al 2017;Selejdak, et al, 2018), increased seismic resistance requirements (Alghuff, et al, 2019;Kramarchuk, et al, 2018) causing the need in strengthening or structural retrofitting (Blikharskyy et al 2019;Brozda et al 2018;Vegera, et al, 2018). Therefore, all these problems need to be taken into account in the design of reinforced concrete structures.…”

Section: Introductionmentioning

confidence: 99%

Computer Modelling of RC Beams Reinforced with High Strength Rebars and Steel Plate

Bobalo

Blikharskyy

Krainskyi

et al. 2019

The use of computers provides the opportunity to analyse and design complex structures, taking into account the geometric and physical nonlinearity of construction materials. In the article the study of stress-strain state of mixed steel-concrete beams, were presented. The results of this study showed that the method of calculation according to designe codes gave satisfactorily results of calculated strength compared with experiments. However, these methodes do not provide complete information of structural performance at all levels of load. For a more complete study of the stress-strain state and the physical nature of the processes occurring in steel-concrete structures reinforced with a mixed reinforcement, the calculation method using “Lira” software complex is proposed. The method of calculation is based on the finite element method. The calculation is made taking into account physical nonlinearity and real diagrams of σ-ε of materials using the nonlinear deformation law №14 of “Lira” software complex. The proposed method of calculation allows to determine the values of bearing capacity, the development of deformations and the beginning of crack formation, as well as stresses at all load levels.