Effect of Mode of Continuity of Tension Reinforcement Bars on Flexural Strength of R.C. Beam (original) (raw)
Related papers
Improving Flexural Moment Capacity of Concrete Beam by Changing the Reinforcement Configuration
International Journal of GEOMATE, 2021
The bar used for concrete beams is generally in shear or stirrups mounted perpendicular to the beam axis. The idea underlying this problem arises from the observation of reinforced concrete beams by changing the configuration of vertical shear reinforcement to less sloping reinforcement, which would be less relevant to the theory of its use. This study aims to analyze the skeletal system bending moment capacity reinforcing beams and producing a theoretical equation of the bending moment of reinforcing the skeletal system. This study is an experimental laboratory with twelve specimens consisting of three normal beams (BN) as control variable beams and nine frame reinforcement beams (BTR) as independent variables. Data were analyzed using the strength design method. The results showed that used reinforcement frame system increases the beam strength when it reaches the ultimate load on the flexural capacity with the MPF frame retaining moment on the BTR25 beam of 10.23%, the BTR50 beam of 7.47%, and the BTR75 beam of 4.60% of the beam BN and found the equation for calculated the frame retaining moment (MPF). The equation can be used for practical calculations of the retaining beam frame system (BTR).
Composites Part B: Engineering, 2014
Reinforced Concrete (RC) beam is a paramount structural member for sustaining loads. As result, finding an appropriate strengthening technique is necessary not only for maintaining the safety of the structures but also for achieving the life span requirements. This paper provided an analytical inspection for experimental work of RC beams strengthened with Self-compacting concrete (SCC) and galvanized steel welded wire mesh (SWM) as reinforcement in flexural. As for practical work, the test program included eighteen small-scale beams. All beams were subjected to monotonically loading rate until failure on three control beams, on four monolithic casted control beams and eleven strengthened beams. The strengthened beams were categorized into two groups A and B based on test variables, namely, the SWM properties and the bonding technique. Based on achieved test results, this strengthening technique improved the flexural capacity of strengthened beams significantly. Simplified structural design for predicting the flexural strength and deflection was introduced in this paper at yielding and at the ultimate stages. The comparison was conducted between tested experimental results and the theoretical analysis results. This analysis was performed based on the basis of flexural theory and also reasonable consistent between experiment test results and calculated values was gained at the ultimate and yield stage as well as the derived formulas can be used in real-world strengthening applications.
2013
The aim of this research is to study flexural behaviour rectangular concrete beams with lap splice between deformed and smooth bars. An experimental program has been performed to investigate the research point, where sixteen rectangular concrete beams were tested in a four point bend configuration. Specimens were grouped into four groups to investigate influences of lap splice length, stirrups intensity and location, end shape, and concrete characteristic strength (N.S.C and H.S.C). It was concluded that distributing stirrups along the splice length increase failure load more than concentrating them at splice ends; end shaping of splices increases failure load; Increasing splice length compared with that required for transmission of tensile stresses through bond decreases ductility; linearity of strain distribution along reinforcement bars increase by the increase and uniformity of stirrups confinement; increasing splice length decreases the difference between strain in deformed and smooth bars.
International Journal of Engineering Research and Technology (IJERT), 2013
https://www.ijert.org/flexural-behavior-of-rectangular-concrete-beams-with-lap-splices-between-deformed-and-smooth-reinforcement-bars https://www.ijert.org/research/flexural-behavior-of-rectangular-concrete-beams-with-lap-splices-between-deformed-and-smooth-reinforcement-bars-IJERTV2IS120547.pdf The aim of this research is to study flexural behaviour rectangular concrete beams with lap splice between deformed and smooth bars. An experimental program has been performed to investigate the research point, where sixteen rectangular concrete beams were tested in a four point bend configuration. Specimens were grouped into four groups to investigate influences of lap splice length, stirrups intensity and location, end shape, and concrete characteristic strength (N.S.C and H.S.C). It was concluded that distributing stirrups along the splice length increase failure load more than concentrating them at splice ends; end shaping of splices increases failure load; Increasing splice length compared with that required for transmission of tensile stresses through bond decreases ductility; linearity of strain distribution along reinforcement bars increase by the increase and uniformity of stirrups confinement; increasing splice length decreases the difference between strain in deformed and smooth bars.
Flexural Capacity of Concrete Beams Reinforced with High-Strength Steel Bars Under Monotonic Loading
International journal of GEOMATE : geotechnique, construction materials and environment, 2021
This paper presents the flexural capacity of reinforced concrete beams designed with highstrength steel bars. Reinforced concrete beams with steel bars fy = 550 MPa are designed to have flexural strength like beams with steel bar fy 420 MPa. According to ACI 318M-19, the high-strength steel bars (fy = 550 MPa) are allowed to use as the reinforcing steel, which previously unpermitted. This study was conducted to represent the possibility of using high-strength steel bars as reinforcement. There are five sample beams that design with various diameters (13 and 19 mm) and strength (fy 420 and 550 MPa) of longitudinal reinforcement. These beams were placed on two simple supported and undergo monotonic loads at two points-load. It is reviewed the flexural capacity of beams with high-strength steel bars involve load capacity, moment, and beam deflection. Also, the behavior of beams when receiving loads in terms of the relationship between load and deflection. Based on the research, beams with a high-strength steel bar can accept higher loads than normal beams by a difference of about 16-18%. While at the same deflection condition, which is 100 mm, beams with high strength reinforcement can achieve a higher load of around 18 percent. Beam with high-strength steel bars showed flexural behavior that was not much different from the normal-strength steel bars because it did not show brittle collapse. It proves that high-strength steel bars can be used on reinforced concrete structural elements if it satisfies the requirements specified in the code.
Journal of Engineering Science and Technology, 2018
The test result of an experimental study on the flexural strength of reinforced concrete beams strengthened with steel plates is presented. The beams were simply supported and loaded monotonically with two point loads. The test variables used in this study were strengthening method and development length of steel plates. Nine beams without strengthening and nine beams strengthened with steel plates were tested until the beams reach the flexural failure specified by crushing of concrete on the top surface of compression region. The test results show that steel plates increase the capacity of the beam significantly and slightly increase the flexural stiffness of the beams. In addition, the ultimate load of the strengthened beams with debonding failure was similar to the beams without strengthening if the load kept increasing until flexural failure. The test results also showed that the debonding failure occurred after the steel plate reach the yield stress value and the development le...
Flexural Strengthening of Reinforced Concrete Be Using Valid Strengthening Techniques
The Egyptian International Journal of Engineering Sciences and Technology (Print), 2016
Efficiency of strengthening reinforced concrete beams using plain concrete layer, reinforced concrete layer plates is investigated in this research. Experiments on strengthened beam samples of dimensions 100x150 were performed. Samples were divided into three groups. Group "A" was strengthened using 20 mm thickn layer only (two types). Group "B" was strengthened using 20 mm thick concrete layer reinforced with mes plastic). Group "C" was strengthened using steel plates. The initial cracking load, ultimate load and crack p tested beams are illustrated. The experimental results showed that, for group A and B, the ultimate streng ductility, and failure mode of RC beams with the same thickness strengthening layer applied, are affected b type and type of concrete layer, while for group C, these parameters are affected by the fixation technique type
The effect of concrete strength and reinforcement on toughness of reinforced concrete beams
Abstract The objective pursued with this work includes the evaluating of the strength and the total energy absorption capacity (toughness) of reinforced concrete beams using different amounts of steel-bar reinforcement. The experimental campaign deals with the evaluation of the threshold load prior collapse, ultimate load and deformation, as well as the beam total energy absorption capacity, using a three point bending test. The beam half span displacement was measured using a displacement transducer, and the applied force was monitored using a load cell. The tested samples consists on a set of ten reinforced concrete beams having three different levels of steel-bar-reinforcement percentages and four different concrete compositions (i.e., giving rise to a different values of concrete strength). It was observed that the most influential parameter in the beams energy absorption capacity is the amount of steel-bar reinforcement. The results have presented good agreement between themselves. In fact, for beams with a given concrete compressive strength, a decrease in beam’s deformation was measured for higher steel-bar-reinforcement percentages. Moreover, the results had shown that for a particular steel-bar-reinforcement percentage, the concrete compressive strength have also influence in the total energy absorption capacity of the beams.