Nonlinear Analysis on Flexural Behavior of Externally Prestressed Composite Beam

2011 ◽  
Vol 71-78 ◽  
pp. 1596-1600
Author(s):  
Yun Long Zhang
Keyword(s):  
Composite Beam ◽  
Constitutive Relations ◽  
Composite Beams ◽  
Flexural Behavior ◽  
Nonlinear Material ◽  
Bending Performance ◽  
Bending Process ◽  
Steel Bars ◽  
Anchor Points ◽  
Nonlinear Constitutive Relations

Steps loading method was used to caculate the whole bending process of a composite beam loaded verticaly in order to accurately analyze the bending performance of composite beams. It has taken into account a variety nonlinear constitutive relations of different materials and based on the layered-step sections transformed method. The displacement of external prestressed steel bars were expressed with rotation angles at anchor points using finite bar elements method. This method is proved reasonable and reliable by comparative analysis of the calculating and the experimental results. It is feasible to analyze the forces and deformations of composite beams which were effcted by nonlinear material factors with layered-step sections transformed method.

scholarly journals Flexural Behavior of Fiber-Reinforced Self-Stressing Concrete T-Shaped Composite Beams

2020 ◽  
Vol 2020 ◽  
pp. 1-17 ◽  
Author(s):  
Boxin Wang ◽  
Ruichang Fang ◽  
Qing Wang
Keyword(s):  
Composite Beam ◽  
Mechanical Analysis ◽  
Composite Beams ◽  
Experimental Results ◽  
Flexural Behavior ◽  
Fiber Reinforced ◽  
Beam Test ◽  
Test Beam ◽  
Bending Performance ◽  
Laminated Layer

Given the excellent crack resistance performance of steel fiber-reinforced self-stressing concrete (SFRSSC), the bending performance of some composite beams with SFRSSC laminated layers was studied. The experiment conducted in this study comprised a single-span composite beam test (including 3 test beams) and a two-span continuous composite beam test (including 2 test beams). All the test beams were T-shaped. The cracking load, yielding load, and ultimate load of all the test beams were recorded and comparatively analyzed. Experimental results showed that the cracking load of the test beam with an SFRSSC laminated layer is significantly increased. Mechanical analysis and numerical simulation of the test beams were conducted, and the obtained results agreed well with the experimental results. The composite beams under different working conditions were also numerically simulated. Through the simulation, reasonable ranges of precompressive stress and length of the SFRSSC laminated layer at intermediate support of continuous composite beam were obtained.

scholarly journals Experimental Study on Timber−Lightweight Concrete Composite Beams with Ductile Bolt Connectors

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2632
Author(s):  
Yafeng Hu ◽  
Yang Wei ◽  
Si Chen ◽  
Yadong Yan ◽  
Weiyao Zhang
Keyword(s):  
Composite Beam ◽  
Lightweight Concrete ◽  
Experimental Testing ◽  
Composite Beams ◽  
Strengthening Effect ◽  
Bending Performance ◽  
Maximum Deformation ◽  
Bending Failure ◽  
Push Out ◽  
Timber Beams

A timber–lightweight−concrete (TLC) composite beam connected with a ductile connector in which the ductile connector is made of a stainless−steel bolt anchored with nuts at both ends was proposed. The push−out results and bending performance of the TLC composite specimens were investigated by experimental testing. The push−out results of the shear specimens show that shear–slip curves exhibit good ductility and that their failure can be attributed to bolt buckling accompanied by lightweight concrete cracking. Through the bending tests of ten TLC composite beams and two contrast (pure timber) beams, the effects of different bolt diameters on the strengthening effect of the TLC composite beams were studied. The results show that the TLC composite beams and contrast timber beams break on the timber fiber at the lowest edge of the TLC composite beam, and the failure mode is attributed to bending failure, whereas the bolt connectors and lightweight concrete have no obvious breakage; moreover, the ductile bolt connectors show a good connection performance until the TLC composite beams fail. The ultimate bearing capacities of the TLC composite beams increase 2.03–3.5 times compared to those of the contrast beams, while the mid-span maximum deformation decrease nearly doubled.

Monotonic and fatigue assessment of steel-concrete composite beams strengthened with externally post-tensioned tendons

2018 ◽  
Author(s):  
◽  
Ayman Elzohairy
Keyword(s):  
Numerical Model ◽  
Composite Beam ◽  
Composite Beams ◽  
Fatigue Tests ◽  
Flexural Behavior ◽  
Bending Test ◽  
Steel Beam ◽  
Premature Failure ◽  
Post Tensioning ◽  
Post Tensioned

[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT AUTHOR'S REQUEST.] The steel-concrete composite beam represents a structural system widely employed in both buildings and girder bridges. The coupling between steel beams and concrete flanges assures both economic and structural benefits because of quick construction of steel structures and large increase in stiffness due to the presence of concrete. Strengthening with external post-tensioning (PT) force is particularly effective and economical for long-span steel-concrete composite beams and has been employed with great success to increase the bending and shear resistance and correct excessive deflections. Applying external PT force to the steel-concrete composite beam is considered an active strengthening technique that can create permanent internal straining action in the beam which is opposite to the existing straining action due to the applied service loads. The most benefits of using this system of strengthening are an elastic performance to higher loads, higher ultimate capacity, and reduction in deformation under the applied loads. Under service loads, bridge superstructures are subjected to cyclic loads which may cause a premature failure due to fatigue. Therefore, fatigue testing is critical to evaluate existing design methods of steel-concrete composite beams. ... This research presents static and fatigue tests on four steel-concrete composite specimens to evaluate the effect of externally post-tensioned tendons on the ultimate strength and fatigue behavior of composite beams. Fatigue tests are conducted to a million cycles under a four-point bending test. In addition, final static tests are performed on fatigued specimens to evaluate the residual strength of the strengthened specimen. A numerical model is described to predict the fatigue response of the composite beam by considering the fatigue damage in the concrete flange. The accuracy of the developed numerical model is validated using the existing test data. The static test results indicate that the external post-tensioning force improves the flexural behavior of the strengthened specimen by increasing the beam capacity and reducing the tensile stress in the bottom flange of the steel beam. The fatigue results demonstrate that the external post-tensioning significantly decreases the strains in the shear connectors, concrete flange, and steel beam. The tendons demonstrated an excellent fatigue performance, with no indication of distress at the anchors.

scholarly journals Flexural Design and Analysis of Composite Beams with Inverted-T Steel Girder with Ultrahigh Performance Concrete Slab

2018 ◽  
Vol 2018 ◽  
pp. 1-16 ◽  
Author(s):  
Wonchang Choi ◽  
Youngcheol Choi ◽  
Sung-Won Yoo
Keyword(s):  
Composite Beam ◽  
Steel Fiber ◽  
Concrete Slab ◽  
Composite Beams ◽  
Flexural Behavior ◽  
Slab Thickness ◽  
Horizontal Shear ◽  
Steel Girder ◽  
Beam Combining ◽  
Ductile Behavior

This study intends to improve the efficiency of the composite beam combining a slab made of steel fiber-reinforced ultrahigh performance concrete (UHPC) and a steel girder without top flange. To that goal, the experiment is conducted on 24 composite beams fabricated with varying compressive strength of UHPC, steel fiber content, stud spacing, and slab thickness to evaluate the behavior of the studs and the flexural behavior of the composite beam combining the UHPC slab and the inverted-T steel girder. The experimental results show the test members developed sufficient ductile behavior with respect to the slip limit of 6 mm stipulated in Eurocode-4 and regardless of the considered test variables. The experimental ultimate horizontal shear force is seen to be clearly larger than the static strengths of the stud predicted by Eurocode-4 and AASHTO-LRFD. Improved design formulae for the composite beam shall be derived to reflect the UHPC slab thickness.

scholarly journals Experimental Flexural Behavior of Composite Beam using Cold Formed Hollow Square Section

2020 ◽  
Vol 9 (4) ◽  
pp. 1987-1992
Keyword(s):  
Composite Beam ◽  
Concrete Strength ◽  
Composite Beams ◽  
Flexural Behavior ◽  
Test Results ◽  
Hollow Section ◽  
Lateral Strength ◽  
Composite Section ◽  
Flexural Tests ◽  
Hot Rolled

Structural hollow sections have excellent properties for resisting static loads, with regard to buckling, bi-axial bending and torsion. Structural hollow sections are generally used for truss components, considering greater stiffness and lateral strength. A square hollow section truss has about two third of surface area of same size I section. Hollow section truss may have smaller members as a result of higher structural efficiency. Construction of composite beam commonly includes I section. This paper deals with comparison of commonly used hot rolled or welded I composite section with cold formed hollow RHS and SHS composite section with respect to flexure and shear. Flexural tests were conducted to evaluate the structural behavior of the proposed composite beams. Two different steel sections were used for this study with nominal concrete strength of 30 MPa. The composite beams were tested under concentrated two points loading. The test results were plotted and compared with analytical results. The mid span deflections and slip were recorded for both composite beams. Buckling modes for both composite beams were identified. comparisons have been carried out between predicted beam strength as provided by Eurocode -4 and experimental test results. Sectional properties are checked for cold formed hollow square section using EN 1993-1-3.

scholarly journals Parameters Analysis for Bending Properties of Externally Prestressed Concrete Beam with Corrugated Steel Webs

2018 ◽  
Vol 186 ◽  
pp. 02006
Author(s):  
Qiang Xu ◽  
Jianyong Song ◽  
Jianxiang Feng ◽  
Jinsheng Du
Keyword(s):  
Cross Section ◽  
Prestressed Concrete ◽  
Composite Beam ◽  
Concrete Beam ◽  
Concrete Strength ◽  
Bending Moment ◽  
Bending Performance ◽  
Prestressed Concrete Beam ◽  
External Tendons ◽  
Bending Process

Based on the bending moment-curvature method, a calculation program for the whole bending process of externally prestressed concrete beam with corrugated steel webs is compiled and parametric analysis is conducted. Considering the nonlinearity of material, this procedure can calculate the whole bending process of externally prestressed composite beam with corrugated steel webs under different load, cross section, and external tendons profiles and output the cross section strain of concrete and ordinary reinforcements, stress increment of external prestressing tendons and mid-span deflection. The results show that the tension steel area has the greatest impact on the bending performance of simply supported externally prestressed composite beam with corrugated steel webs; The second is concrete strength and effective external prestress; The compression steel area has limited impact on the bending performance of such beams. The results can provide a reference for design of the beam.

scholarly journals Flexural behavior of ECC-concrete composite beams reinforced with steel bars

2018 ◽  
Vol 159 ◽  
pp. 175-188 ◽  
Author(s):  
Wen-Jie Ge ◽  
Ashraf F. Ashour ◽  
Xiang Ji ◽  
Chen Cai ◽  
Da-Fu Cao
Keyword(s):  
Composite Beams ◽  
Flexural Behavior ◽  
Steel Bars

scholarly journals Flexural Behavior of Normal and Lightweight Concrete Composite Beams

2021 ◽  
Vol 7 (3) ◽  
pp. 549-559
Author(s):  
Syahrul Syahrul ◽  
M. W. Tjaronge ◽  
Rudy Djamaluddin ◽  
A. A. Amiruddin
Keyword(s):  
Composite Beam ◽  
Lightweight Concrete ◽  
Concrete Beams ◽  
Composite Beams ◽  
Flexural Behavior ◽  
Flexural Capacity ◽  
Normal Concrete ◽  
Moment Capacity ◽  
Steel Bar ◽  
Foamed Concrete

This paper presents an experimental study of the behavior of Normal Concrete Beams (NCB) and composite beams with lightweight foamed concrete (CB), reinforced with steel bar measuring 2 f 8 mm in the compressive section and 2 D 16 mm in the tensile section, shear steel bar f 8 mm. The sample consisted of two normal concrete beams (NCB) and two composite beams with lightweight foamed concrete (CB). The main variables in this study are the type of concrete, the type of steel bar and the flexural behavior. The beam samples were tested by two-point loading, failure mode and crack width were observed. The results showed that the flexural process of normal concrete blocks (NCB) and composite beams with lightweight foamed concrete (CB) was almost the same. There is no slip failure at the combined interface, the flexural capacity of the composite beam with lightweight foamed concrete can be calculated based on the statics analysis and plane-section assumptions. To calculate the ultimate capacity of a composite beam with lightweight foamed concrete is to convert a section consisting of more than one fc' to an equivalent section consisting of one fc'. Furthermore, it is validated by calculating the theoretical moment capacity and comparing the theoretical moment capacity of the experimental results. The results of the flexural test, composite beam with lightweight foamed concrete (CB) showed ductile deflection behavior, diagonal crack patterns, and low flexural capacity of the beam (NCB). Doi: 10.28991/cej-2021-03091673 Full Text: PDF

scholarly journals Flexural Behavior of ECC–Concrete Hybrid Composite Beams Reinforced with FRP and Steel Bars

2019 ◽  
Vol 23 (1) ◽  
pp. 04018069 ◽  
Author(s):  
Wen-Jie Ge ◽  
Ashraf F. Ashour ◽  
Jiamin Yu ◽  
Peiqi Gao ◽  
Da-Fu Cao ◽  
...  
Keyword(s):  
Hybrid Composite ◽  
Composite Beams ◽  
Flexural Behavior ◽  
Steel Bars

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.

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