A novel approach for evaluating the concrete shear strength in reinforced concrete beams

Shuraim, Ahmed B.

doi:10.1590/s1679-78252014000100006

Cited by 12 publications

(5 citation statements)

References 9 publications

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“…Types and amounts of longitudinal reinforcement were varied. A procedure for assessing the shear strength of concrete was presented in [23]. Basic shear strength was determined from the intersection of the load and resistance curves.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Improving the algorithm of choosing spacing and number of stiff supports against a concentrated force in steel-concrete beams

Petrov

Paliy

Naumenko

et al. 2021

EEJET

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A steel-concrete beam was taken as the study object. The algorithm of selecting the number of stiff supports for the steel-concrete beam loaded with a concentrated lateral force in the middle of the span has been refined. Stiff supports served to join the steel strip with concrete to ensure their joint performance. The algorithm was refined based on the condition of equality of the longitudinal force in the steel strip from the action of the calculated load and the maximum longitudinal force obtained after setting the supports. In this case, the longitudinal forces in all stiff supports, as well as the spacing of the stiff supports should be the same. A disadvantage of the known algorithm consists in the complexity of determining the coefficient φb2 taking into account the effect of long-term concrete creep on the element deformation without cracks. This coefficient fluctuates widely and depends on many factors. Besides, it is also insufficiently studied. Calculations for determining the number and spacing of stiff supports in a steel-concrete beam were conducted according to the proposed algorithm and in the Lira software package. The forces acting on the supports and spacing of the supports were the same. The force acting in the support was 8941.5 N. When selecting characteristics of the steel-concrete beam, maximum longitudinal force in the steel strip was obtained. The longitudinal force amounted to 35726 N. The same longitudinal force was obtained from the diagram of longitudinal forces obtained after setting the supports. This study was aimed at improving the design of steel-concrete beams. A rational number and placement of stiff supports ensure savings: the required amount of building materials is reduced and their cost is reduced due to cutting labor costs for their manufacture and operation

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Section: Literature Review and Problem Statementmentioning

confidence: 99%

Improving the algorithm of choosing spacing and number of stiff supports against a concentrated force in steel-concrete beams

Petrov

Paliy

Naumenko

et al. 2021

EEJET

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“…Shear strength test was conducted to ensure that PMMA-PC has sufficient shear capacity to provide proper shear transfer and sufficient horizontal shear resistance at haunches between the superstructure girders and precast panels. The shear strength was determined using a modified 4-point test setup guided by Shuraim [20]. The beams were with a loading rate of 1.0 mm/min using Tinius Olsen Universal Testing Machine with maximum capacity of 1780 kN, resolution of 4.4 ± 0.04 N. The load and displacement were recorded continually with a sampling rate of 1.0 Hz.…”

Section: Shear Testmentioning

confidence: 99%

Polymer Concrete for Bridge Deck Closure Joints in Accelerated Bridge Construction

et al. 2019

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Prefabricated concrete bridge deck panels are utilized in Accelerated Bridge Construction (ABC) to simplify bridge deck construction. Concrete with good bond and shear strength as well as excellent flowability is required to fill bridge deck closure joints. This paper discusses the use of polymer concrete (PC) for bridge deck closure joints in ABC. PC produced using poly methyl methacrylate and standard aggregate was tested. Test results of PC are compared to Ultra-High Performance Concrete (UHPC). Development length, lap splice length and shear strength of unreinforced PC were tested. It is shown that PC has a development length of 3.6 to 4.1 times the reinforcing bar diameter that is close to one-half the development length of 6 to 8 times the bar diameter required with UHPC. PC also showed a shorter splice length compared with that reported for UHPC. Finally, unreinforced PC showed shear strength that is twice that of UHPC. It is evident that using PC in bridge deck closure joints in ABC can improve constructability and provide cost-savings and eliminate reinforcing bar congestion.

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“…The ACI Building Code 318-14 (1987, 1993, 2014 is no doubt the most widely applied Code for the shear design of concrete. The nominal shear capacity of reinforced concrete beam V n , is given as the sum of Concrete contribution V c , and contributions of stirrups V s .…”

Section: Equations Predicting Ultimate Shear Strengthmentioning

confidence: 99%

Statistical Prediction Equations for RC Deep Beam Without Stirrups

Ramadan

AbdelShafy

2017

Facing the Challenges in Structural Engineering

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Abstract. Reinforced concrete (RC) deep beams mainly fail in shear, brittle and sudden in nature can lead to calamitous consequences. Thence, it is critical to determine the shear characteristics of RC deep beams accurately due to involving many parameters at same time. Some of the recent researches have shown that current equations for predicting ultimate shear strength are non-conservative when applied to high strength concrete (HSC) beams as well as some of design codes provisions. There are different approaches for analyzing the behavior of beams in shear.In this paper, a semi-empirical approach is adopted in which a database of existing experimental and literature results of deep beams, d > 300 mm & d < 300 mm, failing in shear under two point loads statically at mid-span, was constructed. The database, 725 deep beams, was used to propose two simplified shear equations using multiple regression analysis, IBM-SPSS-Statistics, to find out and evaluate the most important factors affecting the ultimate shear strength formulating them in a suitable predictive equation for the ultimate shear strength of deep beams without web reinforcement (stirrups). The test database covers a wide range of individual parameters as: cylindrical concrete compressive strength (20 f′ c 104 MPa), longitudinal main steel reinforcement ratio (0.17% q s % 6.64%), effective depth of deep beams "d" (127-1000 mm), shear span to effective depth ratio (1 a/d 2.5), Beam width "b"; b/d < 1, where all database from literature were based on two point loading.This paper concluded that, the proposed equations seem to predict the ultimate shear strengths well, conservative and give lower coefficient of variation "COV" and smaller range of results when compared with the available methods of design; ECP203-2007, ACI 318-14, CSA, and BS8110 codes and other equations proposed by Sudheer Reddy, Zararis, Bazant, Zsutty and Shah.

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A novel approach for evaluating the concrete shear strength in reinforced concrete beams

Cited by 12 publications

References 9 publications

Improving the algorithm of choosing spacing and number of stiff supports against a concentrated force in steel-concrete beams

Improving the algorithm of choosing spacing and number of stiff supports against a concentrated force in steel-concrete beams

Polymer Concrete for Bridge Deck Closure Joints in Accelerated Bridge Construction

Statistical Prediction Equations for RC Deep Beam Without Stirrups

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