scholarly journals Minimum degree of shear connection in composite beams in buildings

2018 ◽  
Author(s):  
Eleftherios Aggelopoulos ◽  
Graham Couchman ◽  
Mark Lawson
Keyword(s):  
Finite Element ◽  
Minimum Degree ◽  
Composite Beams ◽  
Building Construction ◽  
Finite Element Models ◽  
Shear Connectors ◽  
Shear Connection ◽  
Steel Strength ◽  
Special Cases ◽  
Limiting Value

Composite floors are often used in building construction where beams typically span from 6 to 18 m. They are commonly used together with decking of 50 to 80 mm depth that spans 3 to 4.5 m between the beams. Rules for the minimum degree of shear connection in composite beams are presented in Eurocode 4 and other international Codes, and were derived for beams in propped construction.Eurocode 4 defines a minimum limit for the degree of shear connection, primarily to ensure that slip at the steel-concrete interface does not exceed a limiting value. This limit is proportionate to the beam span and also depends on the steel strength and the asymmetry of the flange areas of the section. Currently, many designs cannot achieve the codified degree of shear connection demands, since it is not possible to accommodate a sufficient number of shear connectors on the span as dictated by the spacing of the deck ribs. However, there are special cases which are not explicitly accounted for in Codes. This paper aims to investigate the degree of shear connection requirements in such cases, including beams that are unpropped in construction, beams that are not fully utilised in bending because serviceability criteria govern their design and beams that are predominantly loaded by point loads rather than uniform loading.The results from parametric finite element analyses carried out using ANSYS for beams in the span range of 6 to 18 m are presented. The finite element models have been calibrated against composite beam tests. Comparisons are made with the current Eurocode 4 provisions and modifications are proposed where appropriate.

Mindestverdübelung von Verbundträgern mit kleinskaligen Verbundmitteln – Herleitung des Mindestverdübelungsgrades durch systematischen Einsatz nicht-linearer Finite-Elemente-Berechnungen/Minimum partial shear connection of composite beams with small scaled shear connectors – Derivation of the minimum degree of partial shear connection by systematic use of nonlinear Finite Element Analysis (FEA).

Bauingenieur ◽  
2016 ◽  
Vol 91 (04) ◽  
pp. 140-151
Author(s):  
Martin Herbrand ◽  
Martin Classen
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Minimum Degree ◽  
Nonlinear Finite Element Analysis ◽  
Composite Beams ◽  
Nonlinear Finite Element ◽  
Element Analysis ◽  
Shear Connectors ◽  
Shear Connection ◽  
Finite Elemente

Die Entwicklung neuartiger Verbundmittel für Stahl-Beton-Verbundkonstruktionen ist aktuell mit einem enormen experimentellen Aufwand verbunden. Zur Herleitung geeigneter Bemessungsmodelle und zulässiger Anwendungsbereiche sind einerseits umfangreiche Versuchsreihen zur Erforschung des lokalen Schubtrag- und Verformungsverhaltens der neuen Verbundmittel erforderlich, andererseits werden kostspielige Trägerversuche zur Untersuchung des globalen Tragverhaltens der neuartigen Verbundmittel im Verbundträger durchgeführt. Hierbei steht insbesondere die Frage nach dem erforderlichen Mindestverdübelungsgrad der neuartigen Verbundmittel im Vordergrund. Am Beispiel des innovativen Pin-Verbundmittels wird im Rahmen dieses Beitrags untersucht, inwiefern validierte Finite-Elemente-Modelle von Verbundträgern, die neben der Schubtragfähigkeit auch das Verformungsvermögen der neuartigen Verbundmittel berücksichtigen, zur Herleitung von Mindestverdübelungsgraden eingesetzt werden können und in welchem Maße diese Modelle zum Ersatz oder Teilersatz von Trägerversuchen geeignet sind. Die hier betrachteten kleinskaligen Pin-Verbundmittel wurden zur Schubsicherung in Verbundstrukturen aus Stahl und sehr dünnen hochfesten Betongurten entwickelt, in denen konventionelle Verbundmittel wie Kopfbolzdübel aufgrund der begrenzten Einbindetiefen nicht eingesetzt werden können. Der Beitrag beschreibt die Entwicklung geeigneter nicht-linearer Finite-Elemente-Modelle von Verbundträgern, die Validierung der Modelle an Versuchen und die Durchführung systematischer Parameterrechnungen zur Herleitung von Mindestverdübelungsgraden bei unterschiedlichen Trägerlängen und Belastungssituationen. Abschließend wird für den untersuchten Verbundquerschnitt mit Pin-Verbundmittel ein Handrechenmodell zur Bestimmung des erforderlichen Mindestverdübelungsgrades in Abhängigkeit von der Trägerlänge angegeben. Die vorgeschlagene FE-Modellierungsform und das methodische Vorgehen zur Herleitung des Mindestverdübelungsgrades sind auf andere Verbundmittel- und Querschnittstypen übertragbar.

scholarly journals Test and Numerical Model of Curved Steel–Concrete Composite Box Beams under Positive Moments

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2978
Author(s):  
Zhi-Min Liu ◽  
Xue-Jin Huo ◽  
Guang-Ming Wang ◽  
Wen-Yu Ji
Keyword(s):  
Finite Element ◽  
Static Loading ◽  
Composite Beams ◽  
Parameter Analysis ◽  
Outer Side ◽  
Finite Element Models ◽  
Test Results ◽  
Rotational Angle ◽  
Shear Connection ◽  
Box Beams

Compared with straight steel–concrete composite beams, curved composite beams exhibit more complicated mechanical behaviors under combined bending and torsion coupling. There are much fewer experimental studies on curved composite beams than those of straight composite beams. This study aimed to investigate the combined bending and torsion behavior of curved composite beams. This paper presents static loading tests of the full elastoplastic process of three curved composite box beams with various central angles and shear connection degrees. The test results showed that the specimens exhibited notable bending and torsion coupling force characteristics under static loading. The curvature and interface shear connection degree significantly affected the force behavior of the curved composite box beams. The specimens with weak shear connection degrees showed obvious interfacial longitudinal slip and transverse slip. Constraint distortion and torsion behavior caused the strain of the inner side of the structure to be higher than the strain of the outer side. The strain of the steel beam webs was approximately linear. In addition, fine finite element models of three curved composite box beams were established. The correctness and applicability of the finite element models were verified by comparing the test results and numerical calculation results for the load–displacement curve, load–rotational angle curve, load–interface slip curve, and cross-sectional strain distribution. Finite element modeling can be used as a reliable numerical tool for the large-scale parameter analysis of the elastic–plastic mechanical behavior of curved composite box beams.

scholarly journals Shear connection requirements for composite cellular beams

2018 ◽  
Author(s):  
Eleftherios Aggelopoulos ◽  
Francois Hanus ◽  
Mark Lawson
Keyword(s):  
Finite Element ◽  
Minimum Degree ◽  
Composite Beams ◽  
Beam Test ◽  
Current Version ◽  
Web Openings ◽  
Shear Connection ◽  
Low Degree ◽  
Steel Sections ◽  
Steel Section

Beams with regular circular web openings (cellular beams) are often used in composite construction. Rules for the minimum degree of shear connection in composite beams are presented in Eurocode 4 but were derived for solid web beams in propped construction. This paper investigates the degree of shear connection requirements for composite cellular beams, focusing on the combined effect of using a steel section with regularly spaced, large circular web openings and unpropped construction conditions. The effect of the diameter and the spacing of the openings is also investigated. In order to provide rules for the minimum degree of shear connection in cellular beams, parametric finite element (FE) analyses were carried out for beams in the span range of 9 to 18 m. The results were calibrated against a 15.3 m span composite cellular beam test with a low degree of shear connection. The proposed minimum degree of shear connection requirements for beams with regular circular web openings are presented for both propped and unpropped construction, and for symmetric and asymmetric steel sections. Comparisons are made with equivalent beams with solid webs (no openings) and it is shown that significant relaxation in the codified minimum degree of shear connection to the current version of Eurocode 4 can be justified for composite cellular beams.  

scholarly journals Influence of Shear Connection Distributions on the Behaviour of Continuous Steel-concrete Composite Beams

2017 ◽  
Vol 11 (1) ◽  
pp. 384-395 ◽  
Author(s):  
Alessandro Zona ◽  
Graziano Leoni ◽  
Andrea Dall’Asta
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Composite Beams ◽  
Continuous Steel ◽  
Beam Model ◽  
Shear Connectors ◽  
Shear Connection ◽  
Partial Interaction ◽  
Global And Local

Background: In this work the behaviour of continuous steel-concrete composite beams with different shear connection distributions obtained from two design methods, i.e. Eurocode 4 and a proposed alternative approach, is analysed. Objective: For this purpose a finite element model specifically developed for the nonlinear analysis of steel-concrete composite beams is adopted. This finite element model includes material nonlinearity of slab concrete, reinforcement steel, beam steel as well as slab-beam nonlinear partial interaction due to the deformable shear connection. The inclusion of the partial interaction in the composite beam model provides information on the slab-beam interface slip and shear force and enables to model the failure of the shear connectors. Results and Conclusion: In this way it is possible to analyse and quantify the effect of shear connector distributions on the global and local response of continuous steel-concrete composite beams, both under service load levels and at collapse. Particular attention is focused on the ductility requirements on the shear connectors when varying the connection design approach and distribution.

scholarly journals SIMULAÇÃO NÚMERICA DO COMPORTAMENTO DE VIGAS MISTAS DE AÇO E CONCRETO PROTENDIDAS [ Numerical behavior analysis of prestressed steel-concrete composite beams ]

2018 ◽  
Vol 15 (1) ◽  
Author(s):  
Elder Nogueira Da Silva ◽  
Alex Sander Clemente De Souza
Keyword(s):  
Finite Element ◽  
Numerical Model ◽  
Finite Elements ◽  
Composite Beam ◽  
Concrete Slab ◽  
Constitutive Relations ◽  
Composite Beams ◽  
Experimental Results ◽  
Finite Element Models ◽  
Shear Connectors

RESUMO: O presente trabalho apresenta uma metodologia para análise numérica de vigas mistas de aço e concreto protendidas utilizando o pacote computacional ABAQUS®, que permite modelagens via método dos elementos finitos. A metodologia aborda aspectos relacionados a escolha dos elementos finitos utilizados, geometria das malhas, relações constitutivas dos materiais, condições de acoplamento e vinculação entre os materiais e procedimentos de aplicação dos carregamentos, com o objetivo de simular o comportamento da estrutura. A interação entre laje de concreto e viga de aço foi modelada com conectores e elementos de contato e considerando somente o acoplamento das redes de elementos finitos da laje e da viga. A validação do modelo numérico foi realizada através da correlação entre os resultados numéricos e experimentais disponíveis na literatura. Para ambas as formas de vinculação laje-perfil, o modelo numérico representou de forma satisfatória o comportamento observado experimentalmente. Nos casos em que foram modelados os conectores de cisalhamento as vigas apresentaram menor rigidez e consequentemente melhor correlação entre resultados numéricos e experimentais.ABSTRACT: This paper reports a methodology adopted to represent the behavior of prestressed steel concrete composite beam by finite element models using software ABAQUS®. The methodology presents aspects related to the choice of finite elements types, mesh geometry, constitutive relations of materials, boundary conditions, steel-concrete interaction and sequence of loading.  The interaction between the concrete slab and the steel profile was carried out modeling the shear connectors, using contact elements to modeling the interface and after was carried out using TIE constraint. The validation of the numerical model was carried through the correlation between the numerical and experimental results and it was adequate to simulate the experimentally tested beams for both forms of slab profile bonding, especially for the cases where the shear connectors were modeled, because the beams presented lower stiffness and consequently greater proximity of the experimental results.

FIRE RESISTACE OF SHEAR CONNECTORS FOR COMPOSITE BEAMS

2020 ◽  
Vol 92 (6) ◽  
pp. 59-65
Author(s):  
G.P. TONKIH ◽  
◽  
D.A. CHESNOKOV ◽  
◽  
Keyword(s):  
Fire Resistance ◽  
Composite Structure ◽  
Composite Structures ◽  
Composite Beams ◽  
Design Codes ◽  
Connection Strength ◽  
Shear Connectors ◽  
Shear Connection ◽  
Capacity Reduction ◽  
Russian Research

Most of Russian research about composite structure fire resistance are dedicated to the composite slab behavior. The composite beams fire resistance had been never investigated in enough volume: the temperature evaluation within the scope of the actual Russian design codes leads to the significant reduction in the shear connection strength. Meanwhile, there no correlation between the strength decreasing and type of the shear connection. The article provides an overview of the relevant researches and offers some approaches which could take into account bearing capacity reduction of the shear connectors within composite structures design.

Free Vibration Analysis for Tapered Cross-Section Steel-Concrete Composite Material Beam

2017 ◽  
Vol 893 ◽  
pp. 380-383
Author(s):  
Jun Xia ◽  
Z. Shen ◽  
Kun Liu
Keyword(s):  
Finite Element ◽  
Composite Material ◽  
Cross Section ◽  
Vibration Analysis ◽  
Free Vibration Analysis ◽  
Element Model ◽  
Composite Beams ◽  
Shear Connection ◽  
The Common ◽  
Interlayer Slip

The tapered cross-section beams made of steel-concrete composite material are widely used in engineering constructions and their dynamic behavior is strongly influenced by the type of shear connection jointing the two different materials. The 1D high order finite element model for tapered cross-section steel-concrete composite material beam with interlayer slip was established in this paper. The Numerical results for vibration nature frequencies of the composite beams with two typical boundary conditions were compared with ANSYS using 2D plane stress element. The 1D element is more efficient and economical for the common tapered cross-section steel-concrete composite material beams in engineering.

Reliability analysis of shear connection in composite beams with profiled steel sheeting

2011 ◽  
Vol 8 (1) ◽  
pp. 29-34
Author(s):  
M. Youcef ◽  
M. Mimoune ◽  
F. Mimoune
Keyword(s):  
Reliability Analysis ◽  
Failure Modes ◽  
Composite Beams ◽  
Steel Beam ◽  
British Standard ◽  
Shear Connectors ◽  
Shear Connection ◽  
Composite Slabs ◽  
European Code ◽  
Headed Stud

This paper describes the reliability analysis of shear connection in composite beams with profiled steel sheeting. The profiled steel sheeting had transverse ribs perpendicular to the steel beam. The level of safety of shear connection, and failure modes were determinate. An extensive parametric study was conducted to study the effects on the safety and behaviour of shear connection by changing the profiled steel sheeting geometries, the diameter and height of headed stud, as well as the strength of concrete. We compared the level safety calculated using the American specification, British standard and European code for headed stud shear connectors in composite slabs with profiled steel sheeting perpendicular to the steel beam. It is found that the design overestimated the level safety of shear connection.

scholarly journals Flexural Capacity of Steel-Concrete Composite Beams under Hogging Moment

2019 ◽  
Vol 2019 ◽  
pp. 1-13 ◽  
Author(s):  
Jing Liu ◽  
Fa-xing Ding ◽  
Xue-mei Liu ◽  
Zhi-wu Yu ◽  
Zhe Tan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Flexural Strength ◽  
Composite Beams ◽  
The Other ◽  
Transverse Reinforcement ◽  
Beam Length ◽  
Simply Supported ◽  
Shear Connection ◽  
Abaqus Software

This study investigates the flexural strength of simply supported steel-concrete composite beams under hogging moment. A total of 24 composite beams are included in the experiments, and ABAQUS software is used to establish finite element (FE) models that can simulate the mechanical properties of composite beams. In a parametric study, the influences of several major parameters, such as shear connection degree, stud arrangement and diameter, longitudinal and transverse reinforcement ratios, loading manner, and beam length, on flexural strength were investigated. Thereafter, three standards, namely, GB 50017, Eurocode 4, and BS 5950, were used to estimate the flexural strength of the composite beams. These codes were also compared with experimental and numerical results. Results indicate that GB 50017 may provide better estimations than the other two codes.

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