scholarly journals Prediction of Shear Strength of Reinforced High-Strength Concrete Beams Using Compatibility-Aided Truss Model

2021 ◽  
Vol 11 (22) ◽  
pp. 10585
Author(s):  
Sang-Woo Kim
Keyword(s):  
High Strength Concrete ◽  
Concrete Beams ◽  
Bending Moment ◽  
High Strength ◽  
Experimental Results ◽  
Strength Concrete ◽  
Truss Model ◽  
Proposed Model ◽  
Strength Material ◽  
Mohr’S Circle

This study proposes an analytical model applicable to the shear analysis of reinforced high-strength concrete beams. The proposed model satisfies the equilibrium and compatibility conditions and constitutive laws of the materials. The proposed model is based on the fixed angle theory and allows the principal stress to rotate as the load increases, so that the RC beams can be analyzed more realistically. High-strength material models were used in the proposed model to consider the characteristics of high-strength concrete. The concrete shear contribution at crack surfaces was calculated from Mohr’s circle. The proposed model considers the effect of bending moment on shear by reducing the amount of longitudinal reinforcement resisting shear. To verify the accuracy of the proposed model, a total of 64 experimental results were collected from the literature. A comparison with previous experimental results confirmed that the proposed model can be predicted relatively accurately with an average of 0.98 and a coefficient of variation of 12.1%.

Prestressed high-strength concrete beams under torsion and bending

1999 ◽  
Vol 26 (2) ◽  
pp. 197-207
Author(s):  
Samir A Ashour ◽  
Sabry A Shihata ◽  
Ali A Akhtaruzaman ◽  
Faisal F Wafa
Keyword(s):  
Prestressed Concrete ◽  
High Strength Concrete ◽  
Concrete Beams ◽  
Bending Moment ◽  
High Strength ◽  
Torsional Stiffness ◽  
Test Results ◽  
Torsional Strength ◽  
Interaction Diagram ◽  
Strength Concrete

Test results of 16 rectangular prestressed high-strength concrete beams subjected to the combined action of torsion and bending are presented. The major variables were the ratio of torsion to the bending moment (T/M) and the prestressing level. The beams were subjected to two levels of prestressing, corresponding to 0.05fc' and 0.10fc', where fc' is the compressive strength of concrete (about 90 MPa). Test results showed that the torque-twist relations for the test beams were approximately linear up to cracking and thereafter became nonlinear. Increasing the T/M ratio and the prestressing level increases both torsional stiffness and strength. Several theoretical methods available in the literature developed for normal-strength concrete were used to predict the torsional strength of the tested high-strength concrete beams. Interaction equations were used along with some other methods to predict the torsional capacity in the presence of a bending moment. Good agreement was observed between the experimental and theoretical results.Key words: beams (supports), bending, cracking, failure, high-strength concrete, interaction diagram, prestressed concrete, stiffness, torsion, torsional strength.

scholarly journals Behavior Of A Confined Tension Lap Splice In High-Strength Reinforced Concrete Beams

2015 ◽  
Vol 23 (3) ◽  
pp. 1-8 ◽  
Author(s):  
Ahmed H. Abdel-Kareem ◽  
Hala Abousafa ◽  
Omaia S. El-Hadidi
Keyword(s):  
Compressive Strength ◽  
High Strength Concrete ◽  
Concrete Beams ◽  
High Strength ◽  
Experimental Results ◽  
Experimental Program ◽  
Transverse Reinforcement ◽  
Displacement Ductility ◽  
Lap Splice ◽  
Strength Concrete

Abstract The results of an experimental program conducted on seventeen simply supported concrete beams to study the effect of transverse reinforcement on the behavior of the lap splice of a steel reinforcement in tension zones in high-strength concrete beams are presented. The parameters included in the experimental program were the concrete compressive strength, the lap splice length, the amount of transverse reinforcement provided within the splice region, and the shape of the transverse reinforcement around the spliced bars. The experimental results showed that the displacement ductility increased and the mode of failure changed from a splitting bond failure to a flexural failure when the amount of the transverse reinforcement in the splice region increased, and the compressive strength increased up to 100 MPa. The presence of the transverse reinforcement around the spliced bars had a pronounced effect on increasing the ultimate load, the ultimate deflection, and the displacement ductility. The prediction of maximum steel stresses for spliced bars using the ACI 318-05 building code was compared with the experimental results. The comparison showed that the effect of the transverse reinforcement around spliced bars has to be considered into the design equations for lap splice length in high-strength concrete beams.

scholarly journals Study of Post-Cracking Torsional Behaviour of High-Strength Reinforced Concrete Beams with a Ferrocement Wrap

2014 ◽  
Vol 22 (3) ◽  
pp. 1-12 ◽  
Author(s):  
Gopal Charan Behera ◽  
Tippabhotla Durga Gunneswara Rao ◽  
Chittem Butchi Kameswara
Keyword(s):  
Material Properties ◽  
High Strength Concrete ◽  
Concrete Beams ◽  
High Strength ◽  
Reinforced Concrete Beams ◽  
Test Results ◽  
Strength Concrete ◽  
Truss Model ◽  
Effective Use ◽  
Good Agreement

Abstract The post-cracking behaviour of structures subjected to torsion can be well predicted by Hsu’s softened truss model. The softened truss model is applicable to structures having symmetry in their material properties on all four sides. Wrapping on three faces is a common phenomenon when the top face is provided with a flange or slab. Such a wrapping on three faces of a beam is referred to as a “U” wrap. “U” wraps are better wrapping strategies for distressed structures, as their top face is not accessible for many structures. The material property of an unwrapped face differs from the rest of wrapped faces. For the effective use of wrapping, the unwrapped face needs to be provided with a material having a higher resistance to tension and shear. For this, high-strength concrete in the core is a better option. Here, an attempt is made to predict the torsional capacity of “U” wrapped high-strength concrete beams having an asymmetry in the material using a softened truss model with suitable modifications of the material properties. Efficient algorithms are proposed for the solution of simultaneous equations. The predictions are found to be in good agreement with the experimental test results

Research on the Shear Strength of High-Strength Concrete Beams with Web Bars by Concentrated Load

2013 ◽  
Vol 859 ◽  
pp. 70-75
Author(s):  
Qi Yin Shi ◽  
Li Li Liu
Keyword(s):  
High Strength Concrete ◽  
Concrete Beam ◽  
Concrete Beams ◽  
High Strength ◽  
Experimental Results ◽  
Concentrated Load ◽  
Strength Concrete ◽  
Shearing Strength ◽  
Shear Performance ◽  
Strength Formula

Based on the previous results on the experimental study of shear performance of high-strength concrete beam and the application of mathematical statistics theory, the page establish the shearing strength formula of high strength concrete beams under concentrated load . Comparing regression formula and GB50010-2010 calculated value with the experimental results respectively, it shows that the ultimate strength calculated by regression analysis matches with the experimental results well, but GB2010 calculated results is unsafe.

Flexural behavior of partially fiber-reinforced high-strength concrete beams reinforced with FRP bars

2018 ◽  
Vol 161 ◽  
pp. 587-597 ◽  
Author(s):  
Haitang Zhu ◽  
Shengzhao Cheng ◽  
Danying Gao ◽  
Sheikh M. Neaz ◽  
Chuanchuan Li
Keyword(s):  
High Strength Concrete ◽  
Concrete Beams ◽  
High Strength ◽  
Flexural Behavior ◽  
Fiber Reinforced ◽  
Strength Concrete ◽  
Frp Bars

scholarly journals Experimental Study on the Torsional Behaviour of Prestressed HSC Hollow Beams

2020 ◽  
Vol 10 (2) ◽  
pp. 642 ◽  
Author(s):  
Luís Bernardo ◽  
Sérgio Lopes ◽  
Mafalda Teixeira
Keyword(s):  
Experimental Study ◽  
High Strength Concrete ◽  
Concrete Beams ◽  
Concrete Strength ◽  
High Strength ◽  
Experimental Program ◽  
Pure Torsion ◽  
Strength Concrete ◽  
Hollow Beams

This article describes an experimental program developed to study the influence of longitudinal prestress on the behaviour of high-strength concrete hollow beams under pure torsion. The pre-cracking, the post-cracking and the ultimate behaviour are analysed. Three tests were carried out on large hollow high-strength concrete beams with similar concrete strength. The variable studied was the level of longitudinal uniform prestress. Some important conclusions on different aspects of the beams’ behaviour are presented. These conclusions, considered important for the design of box bridges, include the influence of the level of prestress in the cracking and ultimate behaviour.

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