scholarly journals Analysis of the different techniques for calculation of bearing capacity of flexural reinforced concrete deep beams

2019 ◽  
Author(s):  
Beata Levon ◽  
Remigijus Šalna ◽  
Linas Juknevičius
Keyword(s):  
Reinforced Concrete ◽  
Comparative Analysis ◽  
Systematic Error ◽  
Bearing Capacity ◽  
Experimental Verification ◽  
The Other ◽  
Design Codes ◽  
Shear Reinforcement ◽  
Deep Beams ◽  
Calculation Models

The paper deals with the singularities of the design of deep beams without shear reinforcement according to different design codes, namely, STR 2.05.05:2005, EC2, EC2-SMM and ACI-318. The comparative analysis of calculation models, experimental verification, accuracy of models and the ranking of models according to the Modified Demerit Points Classification (MDP) method are presented. The results shown that despite the systematic error of the STR 2.05.05:2005 method is closest to 1 if compared to the other methods, it is classified as dangerous one according to the MDP ranking.

scholarly journals Rehabilitation of Reinforced Concrete Deep Beam by Epoxy Resin

2019 ◽  
Vol 25 (4) ◽  
pp. 105-121
Author(s):  
Adnan Sadiq Al-kuaity
Keyword(s):  
Reinforced Concrete ◽  
Epoxy Resin ◽  
Analytical Study ◽  
The Other ◽  
Deep Beam ◽  
Shear Reinforcement ◽  
Deep Beams ◽  
Test Beam ◽  
Strength Capacity ◽  
Before And After

This investigation presents an experimental and analytical study on the behavior of reinforced concrete deep beams before and after repair. The original beams were first loaded under two points load up to failure, then, repaired by epoxy resin and tested again. Three of the test beams contains shear reinforcement and the other two beams have no shear reinforcement. The main variable in these beams was the percentage of longitudinal steel reinforcement (0, 0.707, 1.061, and 1.414%). The main objective of this research is to investigate the possibility of restoring the full load carrying capacity of the reinforced concrete deep beam with and without shear reinforcement by using epoxy resin as the material of repair. All beams were tested with shear span-depth ratio 2.2. An analytical study was made to show the behavior of a sample of test beam at higher stages of loadings before and after repair. The test results showed that the epoxy resin used for repairing was very efficient in restoring full capacity of failed beams. Moreover, epoxy resin increased the strength capacity of the original beams by about 14% to 40%. On the other hand, the increase in the longitudinal reinforcement increased significantly the ultimate capacity of deep beams before and after repair.  

3D Finite Element Modeling of GFRP-Reinforced Concrete Deep Beams without Shear Reinforcement

2017 ◽  
Vol 15 (02) ◽  
pp. 1850001 ◽  
Author(s):  
George Markou ◽  
Mohammad AlHamaydeh
Keyword(s):  
Reinforced Concrete ◽  
Mechanical Behavior ◽  
Numerical Investigation ◽  
Numerical Models ◽  
Design Guidelines ◽  
Design Parameters ◽  
Shear Reinforcement ◽  
Deep Beams ◽  
Modes Of Failure ◽  
Hexahedral Elements

This paper presents the numerical investigation of nine Glass Fiber-Reinforced Polymer (GFRP) concrete deep beams through the use of numerically-efficient 20-noded hexahedral elements. Cracking is taken into account by means of the smeared crack approach and the bars are simulated as embedded rod elements. The developed numerical models are validated against published experimental results. The validation beams spanned a practical range of varying design parameters; namely, shear span-to-depth ratio, concrete specified compressive strength and flexural reinforcement ratio. The motivation for this research is to accurately yet efficiently capture the mechanical behavior of the GFRP-reinforced concrete deep beams. The presented numerical investigation demonstrated close correlations of the force–deformation relationships that are numerically predicted and their experimental counterparts. Moreover, the numerically predicted modes of failure are also found to be conformal to those observed experimentally. The proposed modeling approach that overcame previous computational limitations has further demonstrated its capability to accurately model larger and deeper beams in a computationally efficient manner. The validated modeling technique can then be efficiently used to perform extensive parametric investigations related to behavior of this type of structural members. The modeling method presented in this work paves the way for further parametric investigations of the mechanical behavior of GFRP-reinforced deep beams without shear reinforcement that will serve as the base for proposing new design guidelines. As a deeper understanding of the behavior and the effect of the design parameters is attained, more economical and safer designs will emerge.

scholarly journals Experimental Study on Shear Behavior of Reinforced Concrete Sandwich Deep Beam

2020 ◽  
Vol 44 (5) ◽  
pp. 301-309
Author(s):  
Vaka Gopi ◽  
Kagita Kumara Swamy ◽  
Arepalli Peda Gopi ◽  
Vejendla Lakshman Narayana
Keyword(s):  
Experimental Study ◽  
Shear Strength ◽  
Reinforced Concrete ◽  
Effective Length ◽  
Common Element ◽  
Experimental Program ◽  
Deep Beam ◽  
Shear Reinforcement ◽  
Deep Beams ◽  
Depth Ratio

In present making of construction industry at a high pace. The tendency of world influenced the high raised buildings. In modern days one of the most common element is deep beam, constructed a small span to depth ratio. The transfer girders most of used in deep beams. In an experimental program consists of 12 deep beam specimens are carried out for shear strength behavior investigation of Reinforced Concrete sandwich deep beam concealed with insulation pad in various depths 200mm and 300mm and 400mm. in the experimental program effective length, depth, the width of the specimens, width of bearing plates, longitudinal reinforcement as 1% to maintain constantly and horizontal reinforcement as varies as 0.15% and 0.25% and 0.35%. We are considered shear span to depth ratio of deep beam is 0.95. The main aim of the experimental study the influence of longitudinal shear reinforcement along with vertical and horizontal shear reinforcement on the shear strength, shear ductility of RC sandwich deep beams of insulation pads placed at different depths.

Axial Compressive Experimental Study on Full-Scale Square Concrete Columns Confined by High-Strength Spiral Hoops

2012 ◽  
Vol 476-478 ◽  
pp. 2036-2041
Author(s):  
Zhen Bao Li ◽  
Wen Jing Wang ◽  
Wei Jing Zhang ◽  
Yun Da Shao ◽  
Bing Zhang ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Yield Strength ◽  
Bearing Capacity ◽  
High Strength Steels ◽  
High Strength ◽  
Concrete Columns ◽  
Full Scale ◽  
The Other ◽  
Reinforced Concrete Columns ◽  
Deformation Ability

3 specimens of full-scale reinforced concrete columns were tested under monotonic axial loading, in which the hoop configuration of one specimen was #, and the other two used the two-directional composite spiral hoops. The axial compressive performances of full-scale reinforced concrete columns confined by different configurations and strengths of hoops were discussed. One of the columns confined by spiral hoops used high-strength steels with the yield strength of 1000MPa as hoops, while the other two columns used ordinary-strength steel with yield strength of 400MPa. Columns confined by spiral hoops exhibited slight higher bearing capacity and better deformation ability than columns with hoop configuration #. The results also indicated that compared with the specimen used ordinary-strength hoops, the bearing capacity of the specimen used high-strength hoops was basically the same, but the deformation ability improved obviously.

scholarly journals PREDICTION OF SHEAR CAPACITY OF UHPC – CONCRETE COMPOSITE STRUCTURAL MEMBERS BASED ON EXISTING CODES

2018 ◽  
Vol 24 (8) ◽  
pp. 607-618 ◽  
Author(s):  
Hor Yin ◽  
Kazutaka Shirai ◽  
Wee Teo
Keyword(s):  
Shear Strength ◽  
Reinforced Concrete ◽  
Volume Fraction ◽  
Shear Capacity ◽  
The Other ◽  
Experimental Investigations ◽  
Design Codes ◽  
Structural Members ◽  
Reasonable Accuracy ◽  
Excellent Performance

Reinforced concrete (RC) structural members strengthened with ultrahigh-performance concrete (UHPC) have shown excellent performance in past experimental investigations. However, methods of predicting their capacity are currently very limited. This paper presents six independent methods of predicting the shear capacity of UHPC–concrete composite members based on the application of existing design codes. Three of these methods are based on the conversion of the volume fraction of steel fibres in the UHPC in an equivalent longitudinal steel ratio. The other three methods involve the computation of the shear strength as a sum of the contributions to the shear strength by the RC member and the UHPC layer, each of which is independently calculated. It was demonstrated that the proposed methods based on existing design codes are able to predict the strength of UHPC–concrete composite members with reasonable accuracy.

scholarly journals COMPARATIVE ANALYSIS OF RESEARCH AND CALCULATED VALUES OF BEARING CAPACITY OF REINFORCED CONCRETE AND BASALT CONCRETE BEAMS ACCORDING TO RECOMMENDATIONS OF NATIONAL DESIGN STANDARDS

2020 ◽  
pp. 43-49
Author(s):  
I. Karpiuk ◽  
◽  
V. Karpiuk ◽  
E. Klimenko ◽  
A. Tselikova ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Comparative Analysis ◽  
Bearing Capacity ◽  
Concrete Beams ◽  
Concrete Structures ◽  
Design Standards ◽  
Metallic Composite ◽  
Regulatory Documents ◽  
Foreign Countries ◽  
Composite Reinforcement

Abstract. Non-metal composite reinforcement is increasingly being used in modern construction. Composite reinforcement is a great step forward over steel, due to its higher strength and corrosion resistance. An analysis of the use of these fittings was performed, which showed that the United States, Japan and China are leading countries in the use of composite fittings. The more active pace of implementation of composite reinforcement is limited by the fact that composite reinforcement does not have a common method for calculating their bearing capacity. That is why the article discusses regulatory documents on the calculation and design of structures reinforced with composite reinforcement from around the world. The article provides a comparative analysis of the calculations of the bearing capacity of prototypes – beams, reinforced with basalt-plastic reinforcement, according to the available design standards of foreign countries, which were among the first to use non-metallic composite reinforcement for reinforcing span concrete structures. The methods of calculating the bearing capacity of beam elements for concrete and non-metallic composite reinforcement according to regulatory documents are examined in detail. A comparative analysis of the actual bearing capacity of inclined sections of basalt concrete beams and its calculated values calculated according to the recommendations of the existing design standards of foreign countries is carried out. The analysis showed that the actual bearing capacity of the inclined sections of basalt concrete beams and its calculated value showed their unsatisfactory convergence. A common feature of all considered foreign design standards is the underestimation, up to several times, of the bearing capacity of inclined sections of prototypes ‒ beams reinforced with both steel and basalt-plastic reinforcement. It has been established that the methods for calculating the bearing capacity of supporting sections of spans of reinforced concrete and basalt concrete structures, presented in national design standards, are based not on the new general method, but on partially improved methods that were used in previously existing standards.

scholarly journals Experimental and calculated evaluation of carbon fiber reinforcing for increasing concrete columns carrying capacity

2019 ◽  
Vol 97 ◽  
pp. 04007 ◽  
Author(s):  
Ekaterina Kuzina ◽  
Vladimir Rimshin
Keyword(s):  
Composite Material ◽  
Reinforced Concrete ◽  
Carbon Fiber ◽  
Bearing Capacity ◽  
Carbon Fibers ◽  
Carrying Capacity ◽  
Concrete Columns ◽  
The Other ◽  
Concrete Elements ◽  
Discrete Arrangement

The article presents the concrete columns tests results reinforced with canvases based on carbon fibers FibARM Tape 530/300 and FibARM Lamel 14/100 slats, the calculation of the use effectiveness for strengthening the compressed reinforced concrete elements. Three groups of columns were tested: unreinforced columns, columns reinforced with FibARM Tape 530/300 canvases in one layer, reinforced with FibARM Lamel 14/100 lamella (width is 100 mm), while one of the samples was reinforced with lamella only, and the other was reinforced both lamella and clamps. In addition, it was proposed calibration calculation of concrete columns reinforced with canvases based on carbon fibers FibARM Tape 530/300, the calculation purpose was to determine the bearing capacity for evaluating the suitability in the further structure operation after columns strengthening. According to the experiment results, data were obtained on the carrying capacity of centrally compressed concrete columns reinforced with carbon fiber both with a discrete arrangement of bands (strips) made of composite material along the height of the structures, as well as with their continuous wrapping (analogue of reinforced concrete holder). According to the experiment results, data were obtained on the carrying capacity of centrally compressed concrete columns reinforced with carbon fiber, both with a discrete arrangement of bands (strips) made of composite material along the height of structures, and with their continuous wrapping (analogue of reinforced concrete holder).

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