Shear strength of heavily reinforced concrete members with circular cross section

2010 ◽  
Vol 32 (3) ◽  
pp. 617-626 ◽  
Author(s):  
Uffe G. Jensen ◽  
Linh C. Hoang ◽  
Henrik B. Joergensen ◽  
Lars S. Fabrin
Keyword(s):  
Shear Strength ◽  
Reinforced Concrete ◽  
Cross Section ◽  
Circular Cross Section ◽  
Concrete Members

scholarly journals Shear strength of reinforced concrete circular cross-section beams

2012 ◽  
Vol 5 (6) ◽  
pp. 781-797
Author(s):  
P. W. G. N. Teixeira ◽  
C. E. M. Maffei ◽  
M. C. Guazzelli
Keyword(s):  
Shear Strength ◽  
Reinforced Concrete ◽  
Cross Section ◽  
Rectangular Cross Section ◽  
Circular Cross Section ◽  
Beam Width ◽  
Practical Experience ◽  
Reinforced Concrete Beams ◽  
Concrete Members ◽  
Effective Depth

A proposed adequation of NBR 6118, Item 7.4, related to shear strength of reinforced concrete beams is presented with aims to application on circular cross-section. The actual expressions are most suitable to rectangular cross-section and some misleading occurs when applied to circular sections at determination of VRd2, Vc and Vsw, as consequence of bw (beam width) and d (effective depth) definitions as well as the real effectiveness of circular stirrups. The proposed adequation is based on extensive bibliographic review and practical experience with a great number of infrastructure elements, such as anchored retaining pile walls, where the use of circular reinforced concrete members is frequent.

scholarly journals Shear and Flexural Capacity of Reinforced Concrete Members with Circular Cross Section

2017 ◽  
Vol 171 ◽  
pp. 957-964 ◽  
Author(s):  
Rendy Thamrin ◽  
Ruddy Kurniawan ◽  
Annisa Prita Melinda
Keyword(s):  
Reinforced Concrete ◽  
Cross Section ◽  
Circular Cross Section ◽  
Flexural Capacity ◽  
Concrete Members

scholarly journals Shear failure in reinforced concrete members without transverse reinforcement: analysis of model error of NBR6118:2014

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Vinicius Paes de Barros ◽  
André Teófilo Beck ◽  
Túlio Nogueira Bittencout
Keyword(s):  
Shear Strength ◽  
Reinforced Concrete ◽  
Cross Section ◽  
Linear Regression Analysis ◽  
Model Error ◽  
Reinforcement Rate ◽  
Longitudinal Reinforcement ◽  
Model Errors ◽  
Concrete Members ◽  
Normative Models

Abstract This article presents an analysis of NBR6118:2014 models used to determine the one-way shear strength in reinforced concrete members without transversal reinforcement. The study compares model predictions with 751 experimental results, taken from the 2015 ACI-DAfStb database and from Quach. Model errors are quantified. Mean values observed are around unity, indicating models with no bias, but coefficients of variation are large. Model error trends are identified with respect to cross-section depth and longitudinal reinforcement rate. In elements with low rate of longitudinal reinforcement and/or large cross-section depths, the normative models provide results with low safety. This shows the need for revision of the normative models. By means of non-linear regression analysis, two correction terms are proposed to consider the longitudinal reinforcement rate and the size effect (decrease in shear strength with increase in section depth). With the proposed corrections, the observed trends are eliminated, and the design equation becomes more accurate with respect to cross-section shear.

Models for Evaluating Shear Strength on Members with Circular Cross Section

2019 ◽  
Author(s):  
José Turmo ◽  
Gonzalo Ramos ◽  
Ángel C. Aparicio
Keyword(s):  
Shear Strength ◽  
Cross Section ◽  
Circular Cross Section

<p>Solid circular columns are often used as structural supports in bridges, buildings and foundations due to their simplicity of construction and because their strength is similar in any direction. This deem them very suitable to resist wind and seismic loads. Hollow core circular concrete members are much less structurally used than solid circular cross sections. However, these can be found in concrete chimneys, concrete pipes and elevated water tanks, as well as in large bridge columns and offshore platforms. Codes do not usually propose specific formulations for evaluating the shear strength of such structural types or if they do, they do so in a very simplified manner.</p><p>Hence, an analytical model for evaluating the contribution of the transverse reinforcement in concrete members of solid and hollow circular cross section is presented in this paper. After a thorough bibliographic research on the previous studies on the matter, the shortage of work accomplished on the topic has been assessed and the unsolved problems identified. A formula for evaluating the shear transferred by spiral reinforcement in solid members is presented. A formula for the calculation of hollow core circular columns with both vertical and spiral reinforcement is also deduced. Assumptions made for the calculation of this formulation have been deduced theoretically and then checked empirically. Hence, shear tests on circular hollow core specimens will be also presented.</p>

THE ANALYSIS OF SHEAR STRENGTH OF FLEXURAL RC ELEMENTS ACCORDING TO EC2 AND STR / LENKIAMŲJŲ GELŽBETONINIŲ ELEMENTŲ ĮSTRIŽOJO PJŪVIO STIPRUMO PAGAL STR IR EC2 ANALIZĖ

2013 ◽  
Vol 4 (4) ◽  
pp. 133-144 ◽  
Author(s):  
Šarūnas Kelpša ◽  
Mindaugas Augonis
Keyword(s):  
Shear Strength ◽  
Reinforced Concrete ◽  
Cross Section ◽  
Shear Force ◽  
Bending Moment ◽  
Intersection Point ◽  
Shear Reinforcement ◽  
Truss Model ◽  
Calculation Results ◽  
The Difference

When the various reinforced concrete structures are designed according to EC2 and STR, the difference of calculation results, is quite significant. In this article the calculations of shear strength of bending reinforced concrete elements are investigated according to these standards. The comparison of such calculations is also significant in the sense that the shear strength calculations are carried out according to different principles. The STR regulations are based on work of the shear reinforcement crossing the oblique section and the compressed concrete at the end of the section. In this case, at the supporting zone, the external bending moment and shear force should be in equilibrium with the internal forces in reinforcement and compressed concrete, i.e., the cross section must be checked not only from the external shear force, but also from bending moment. In EC2 standard, the shear strengths are calculated according to simplified truss model, which consists of the tension shear reinforcement bars and compressed concrete struts. The bending moment is not estimated. After calculation analysis of these two methods the relationships between shear strength and various element parameters are presented. The elements reinforced with stirrups and bends are investigated additionally because in EC2 this case is not presented. According to EC2 the simplified truss model solution depends on the compression strut angle value θ, which is limited in certain interval. Since the component of tension reinforcement bar directly depends on the angle θ and the component of compression strut depends on it conversely, then exists some value θ when the both components are equal. So the angle θ can be found when such two components will be equated. However, such calculation of angle θ became complicated if the load is uniform, because then the components of tension bar are estimated not in support cross section but in cross section that are displaced by distance d. So, the cube equation should be solved. For simplification of such solution the graphical method to find out the angle θ and the shear strength are presented. In these graphics the intersection point of two components (shear reinforcement and concrete) curves describes the shear strength of element. Santrauka Straipsnyje apžvelgtos ir palygintos STR ir EC2 įstrižojo pjūvio stiprumo skaičiavimo metodikos stačiakampio skerspjūvio elementams. Normatyve neapibrėžtas EC2 metodikos santvaros modelio spyrių posvyrio kampo skaičiavimas, lemiantis galutinį įstrižojo pjūvio stiprumą. Straipsnyje pateikiamos kampo θ apskaičiavimo lygtys, atsižvelgiant į apkrovimo pobūdį. Norint supaprastinti pateiktų lygčių sprendimą siūlomas grafoanalitinis sprendimo būdas, pritaikant papildomus koeficientus. EC2 neapibrėžia skaičiavimo išraiškų, kai skersinis armavimas yra apkabos ir atlankos. Minėtos išraiškos suformuluotos ir pateiktos straipsnyje. Nustačius EC2 metodikos dėsningumus siūlomas alternatyvus apytikslis skaičiavimo būdas atlankomis ir apkabomis armuotiems elementams. Straipsnyje apžvelgtos abi – STR ir EC2 – metodikos, išskiriant pagrindinius skirtumus ir dėsningumus.

Sign in / Sign up

Export Citation Format

Share Document