scholarly journals A Non-Linear Finite Element Modelling of Composite Beam to CFST Column Connection

2019 ◽  
Vol 8 (6) ◽  
pp. 4122-4125
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Composite Structure ◽  
Composite Beam ◽  
Concrete Slab ◽  
Reinforced Concrete Beam ◽  
Construction Time ◽  
Reinforced Concrete Slab ◽  
Steel Connection ◽  
Bare Steel

The use of steel and concrete composite structure is increasing day by day especially the use of CFST columns in multistory composite building frames due to the reason that they can significantly reduce overall construction time by eliminating the need of formwork and sometimes even reinforcing bars. However, creating an ideal joint between composite beam and CFST column is quite challenging task from design, analysis and construction point of view. This connection behaviour can best be understood by its moment-rotation curve. So, here attempt has been made to model this composite connection numerically with the software which uses Finite Element Methods as a tool and results are validate. The composite connection possesses all three kinds of non-linearity, that are, geometric, material and boundary/contact nonlinearities. It is known that composite connection is nothing but the combination of bare steel connection and reinforced concrete slab with proper shear transfer mechanism and so first a bare steel connection and reinforced concrete beam is modelled. An explicit representation of connection is not necessary as long as the adequate features are captured. So attempt has been made to optimize the connection where ever it is possible. Usually design engineers design composite structure while neglecting the “composite action”in during the analysis. Sometimes these composite actions contribute much in resisting the applied load.

Tame Valley Viaduct Assessment and Strengthening

2016 ◽  
Author(s):  
Sarah Jane Blick ◽  
Chris West
Keyword(s):  
Reinforced Concrete ◽  
Design Process ◽  
Composite Structure ◽  
Concrete Slab ◽  
City Centre ◽  
Box Girders ◽  
Reinforced Concrete Slab ◽  
Current Loading ◽  
The Web

Tame Valley Viaduct is a 620m long multi-span highway structure linking Birmingham city centre to the M6 motorway. An assessment in 2004 found the capacity of the structure to be inadequate for current loading, resulting in a requirement for strengthening. Before strengthening works were designed, a comprehensive, refined re-assessment of the structure was undertaken to fully define which areas needed strengthening and which did not. The composite structure comprises a reinforced-concrete slab and typically four longitudinal steel box girders. Each of these longitudinal girders comprises approximately 600 sets of web and flange panels. The scale of the task required automation of the assessment and design process. This paper discusses how the automation was undertaken including the preparation of models to calculate individual panel loading, assessment of the web and flange panels, and the checking of strengthening solutions.

Calculation of Reinforced Concrete Prismatic Shells by the Finite Element Method Using Variable Elasticity Parameters

2019 ◽  
Vol 945 ◽  
pp. 969-974
Author(s):  
V. Kruglov ◽  
V. Iurchenko
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Finite Elements ◽  
Concrete Slab ◽  
Volume Ratio ◽  
High Strength ◽  
Finite Elements Method ◽  
Software Module ◽  
Reinforced Concrete Slab ◽  
Elastic Characteristics

The paper considers the modification of the generally accepted formulation of the finite elements method by applying in the calculation I.Mileykovski’s refined technical theory of shells that takes into account the deformations of the transverse shear along the thickness of the model. When applying this solution path, it is possible to calculate thick and thin shells (plates) with equal efficiency, taking into account the complex strained state of an anisotropic material. It illustrates the inclusion in the computational algorithm of variable parameters of the elasticity of concrete, allowing more accurate evaluation of the stress-strain state in the finite element under complex (combined) loads. The presence of reinforcement in the material is modeled by dividing the structure into layers and sequentially reduction the elastic characteristics of the material based on the volume ratio of the components. The advantage of the algorithm is the ease of its integration with the conventional finite elements method. All transformations in this case consist in the modification of expressions for determining the elastic characteristics of the construction, calculating the gradient and stiffness matrices, while the sequence of further calculations does not change. This enables to use the proposed algorithm, including as a plug-in software module, expanding the capabilities of existing computing programs. The article demonstrates the application of the method in modeling a reinforced concrete slab made with the use of multi-component high-strength concrete of a heavy class having a prismatic strength under uniaxial compression of more than 110 MPa.

Summary of Study on Composite Concrete Slabs

2013 ◽  
Vol 351-352 ◽  
pp. 695-698
Author(s):  
Lei Wang ◽  
Hong Ya Zhang
Keyword(s):  
Reinforced Concrete ◽  
Composite Structure ◽  
Concrete Slab ◽  
Engineering Application ◽  
Concrete Slabs ◽  
Reinforced Concrete Slab ◽  
Recent Advances ◽  
The Future ◽  
At Home

Reinforced Concrete Slab is one of the important types of composite structure, About the concrete laminated slab of the research and the engineering application are summarized, Point out that the characteristics of Composite Concrete Slabs, the application and development of the laminated slab of recent advances at home and abroad, and look into the future of the Composite Concrete Slabs research.

Microcomputer analysis of reinforced concrete slab systems

1993 ◽  
Vol 20 (4) ◽  
pp. 587-601 ◽  
Author(s):  
Pierre Léger ◽  
Patrick Paultre
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Structural Design ◽  
Concrete Slab ◽  
Three Dimensional ◽  
Structural Behaviour ◽  
Reinforced Concrete Slab ◽  
Element Analysis ◽  
Equivalent Frame ◽  
Frame Method

Microcomputer finite element analysis of reinforced concrete slab systems can now be routinely performed to produce realistic numerical simulation of three-dimensional structural behaviour. However, an efficient use of this approach requires an automated integration of design and analysis procedures. Guidelines for proper finite element modelling of slab systems are first presented along with simple post-processing algorithms to perform automatically the design or verifications from the analytical results. Numerical applications on simple slab systems subjected to uniform and concentrated loads are then used to illustrate the relative performance between finite element analyses and the equivalent frame method. Key words: microcomputer, reinforced concrete slab, finite element method, structural design.

scholarly journals Operation of a steel-concrete composite beam considering slab cracking

2014 ◽  
Vol 13 (2) ◽  
pp. 265-274
Author(s):  
Marek Łagoda ◽  
Krzysztof Śledziewski
Keyword(s):  
Reinforced Concrete ◽  
Composite Beam ◽  
Composite Structures ◽  
Current Practice ◽  
Concrete Slab ◽  
Experimental Studies ◽  
The State ◽  
Reinforced Concrete Slab ◽  
Continuous Beams ◽  
Indeterminate Structures

The theme of the paper is the effect of scratching of reinforced concrete slab on the work of a steel-concrete composite beam. The paper evaluates the state of knowledge in the field of composite structures, in particular, statically indeterminate structures with concrete in tension zones. Additionally, in a nutshell, it describes the current practice of design. Moreover, experimental studies were described on continuous beams that were made by the authors. A proposal for further work on this topic was also presented.

A Practical Investigation into Acoustic Wave Propagation in Concrete Structures

2006 ◽  
Vol 13-14 ◽  
pp. 205-212 ◽  
Author(s):  
Muhamad Bunnori Norazura ◽  
Rhys Pullin ◽  
Karen M. Holford ◽  
R.J. Lark
Keyword(s):  
Wave Propagation ◽  
Reinforced Concrete ◽  
Wave Velocity ◽  
Concrete Slab ◽  
Concrete Structures ◽  
Reinforced Concrete Beam ◽  
Health Condition ◽  
Time Of Arrival ◽  
Reinforced Concrete Slab ◽  
Single Wave

Acoustic Emission (AE) testing in concrete structures shows great potential for monitoring and assessing the health condition of structures. Source location is normally based on the arrival times of transient signals, the simplest method is known as the Time of Arrival (TOA) method, where the location of the damage can be determined from the arrival time of the event at two or more sensors. When using this method, the wave velocity of the signals that propagate through the material needs to be determined. Homogenous materials, such as steel, have welldefined velocities, but in non-homogeneous materials such as concrete the wave velocity is more difficult to predict. This makes the use of a single wave velocity as required in the TOA method very difficult due to the variety of wave velocities obtained, especially for large structures. This paper explores wave propagation in concrete structures over a variety of source to sensor distances. Experiments were performed on a reinforced concrete beam and a reinforced concrete slab, using an Hsu-Nelsen (H-N) Source. It is found that, in general, as the source to sensor distance increases, the wave velocity decreases. The presence of longitudinal and transverse waves is demonstrated and the influence of the part of the waveform used for temporal measurement is explored. In order to provide a practical approach to velocity determination, different thresholds are investigated and the results are discussed in relation to the wave modes present.

scholarly journals Finite Element Analysis of the Stability of a Sinusoidal Web in Steel and Composite Steel-Concrete Girders

Materials ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1041 ◽  
Author(s):  
Krzysztof Śledziewski ◽  
Marcin Górecki
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Concrete Slab ◽  
Initial Stresses ◽  
Shear Stresses ◽  
Reinforced Concrete Slab ◽  
The Stability ◽  
The Impact ◽  
The Web ◽  
Composite Steel

This paper presents the results of numerical investigations into the behavior of a sinusoidal web loaded in shear due to buckling in the period from the onset of buckling until failure, as well as the impact of a reinforced concrete slab on the stability of the web. The analysis concerned steel girders and composite girders with the top flange bonded to a reinforced concrete slab. Nonlinear analyses were performed using the finite element method. The results of the investigations support the conclusion that the appearance and propagation of shear stresses in the sinusoidal web of the composite steel–concrete beam are the same as those in an identical non-composite steel beam, but the bracing of the top flanges improves the shear strength and, at the same time, affects the location of initial stresses. In addition, it was found that, despite the three types of buckling, the predominant failure of the sinusoidal webs, regardless of the presence of the concrete slab, is global buckling. It occurs diagonally through several folds at the same time, including deformation of the web over its entire height.

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