scholarly journals Demountable composite steel-concrete floors: A state-of-the-art review

2021 ◽  
Vol 73 (03) ◽  
pp. 249-263
Keyword(s):  
Sustainable Development ◽  
Composite Structures ◽  
Shear Force ◽  
State Of The Art ◽  
Composite Slab ◽  
Research Results ◽  
Shear Connectors ◽  
The Past ◽  
Numerical Research ◽  
Push Out

In keeping with current demands for sustainable development in all segments of the industry, numerous research in the field of steel-concrete composite structures has been focused on developing demountable shear connectors. In the past years, various demountable shear connectors have been suggested, with various mechanisms for transferring shear force between a steel profile and a concrete or composite slab. In this paper, a state of the art on the topic is given, and experimental and numerical research results of push-out and beam tests are summarized.

scholarly journals Shear Capacity of Headed Studs in Steel-Concrete Structures: Analytical Prediction via Soft Computing

2020 ◽  
Author(s):  
Abambres M ◽  
He J
Keyword(s):  
Neural Network ◽  
Analytical Model ◽  
Composite Structures ◽  
Shear Force ◽  
Longitudinal Shear ◽  
Shear Capacity ◽  
Analytical Prediction ◽  
Neural Network Approach ◽  
Shear Connectors ◽  
Headed Stud

<p>Headed studs are commonly used as shear connectors to transfer longitudinal shear force at the interface between steel and concrete in composite structures (e.g., bridge decks). Code-based equations for predicting the shear capacity of headed studs are summarized. An artificial neural network (ANN)-based analytical model is proposed to estimate the shear capacity of headed steel studs. 234 push-out test results from previous published research were collected into a database in order to feed the simulated ANNs. Three parameters were identified as input variables for the prediction of the headed stud shear force at failure, namely the steel stud tensile strength and diameter, and the concrete (cylinder) compressive strength. The proposed ANN-based analytical model yielded, for all collected data, maximum and mean relative errors of 3.3 % and 0.6 %, respectively. Moreover, it was illustrated that, for that data, the neural network approach clearly outperforms the existing code-based equations, which yield mean errors greater than 13 %.</p>

scholarly journals Pengaruh Panjang dan Diameter Stud terhadap Keruntuhan Geser Struktur Komposit Baja-Beton

2019 ◽  
Vol 24 (2) ◽  
pp. 96
Author(s):  
Rahma Nindya Ayu Hapsari ◽  
Ilham Nurhuda ◽  
Nuroji Nuroji
Keyword(s):  
Composite Structures ◽  
Load Capacity ◽  
Bending Moment ◽  
Concrete Slabs ◽  
Steel Beams ◽  
Shear Connector ◽  
Shear Connectors ◽  
Concrete Blocks ◽  
Stud Shear Connector ◽  
Push Out

Composite structures of concrete slabs and steel beams require shear connectors to transfer shear force between steel beams and concrete slabs. The strength of stud shear connector specified on SNI 03-1729-2013 only considers the effect of stud diameter, however the length of a stud may influence its behavior and strength. This research observes the effects of length and diameter (𝓁/𝒹) of shear connectors on the strength. This research was conducted using the push out method explain in AS-4347- Part I. The test specimens observed in this research were concrete and steel composites, composing IWF 350x175x11x14 mm and concrete blocks of size 450x225x160 mm. The studs were made of steel reinforcements with diameter (𝒹) of 10, 16 and 22 mm, were welded on IWF with 5 mm weld thickness. The length of studs for each stud diameter were 4d, 5d, and 6d. The results indicate that the increase in stud diameter will increase the load capacity of stud. The length of studs effect its load capacity. A slim stud experiences large bending moment at the base of the shear connector. The results show that the highest value of load capacity is measured at specimens with 𝓁/𝒹 ratio of 5.

scholarly journals Push-out tests on demountable shear connectors of steel-concrete composite structures

Structures ◽  
2019 ◽  
Vol 21 ◽  
pp. 45-54 ◽  
Author(s):  
A. Kozma ◽  
C. Odenbreit ◽  
M.V. Braun ◽  
M. Veljkovic ◽  
M.P. Nijgh
Keyword(s):  
Composite Structures ◽  
Shear Connectors ◽  
Push Out

scholarly journals State-of-the-Art of Research on Damage Mechanism and Mechanical Property of the Composite Structures after Exposure to Fire

2017 ◽  
Vol 11 (1) ◽  
pp. 867-872
Author(s):  
Chunyang Liu ◽  
Yuzhuo Wang ◽  
Xin Liu ◽  
Dabin Yang ◽  
Xiuli Du
Keyword(s):  
Mechanical Property ◽  
Composite Structure ◽  
Composite Structures ◽  
Research Method ◽  
State Of The Art ◽  
Research Work ◽  
Damage Mechanism ◽  
Frame Structure ◽  
The Past ◽  
Static Experiment

Introduction: Based on the comparative and analytical studies on the research work conducted on the damage mechanism and mechanical property of the composite structure after exposure to fire, the research method and the research achievements are summarized and reviewed. Results and Conclusion: The achievements are mainly obtained from the studies on the beam (floor-slab) component, beam-column joints and the frame structure by the means of the axial compression static experiment or quasi static experiment in the past. Finally, some issues that still need to be studied are also discussed from three prospects.

Push-out tests of demountable headed stud shear connectors in steel-UHPC composite structures

2017 ◽  
Vol 170 ◽  
pp. 69-79 ◽  
Author(s):  
Jun-Yan Wang ◽  
Jun-Yuan Guo ◽  
Liang-Jiu Jia ◽  
Shi-Ming Chen ◽  
Yang Dong
Keyword(s):  
Composite Structures ◽  
Shear Connectors ◽  
Headed Stud ◽  
Push Out

scholarly journals Push-out tests on demountable shear connectors of steel-concrete composite structures

2018 ◽  
Author(s):  
Andras Kozma ◽  
Chirstoph Odenbreit ◽  
Matthias Volker Braun ◽  
Milan Veljkovic ◽  
Martin Nijgh
Keyword(s):  
Epoxy Resin ◽  
Composite Structures ◽  
Shear Connectors ◽  
Resin Injection ◽  
Shear Connections ◽  
Principles Of Design ◽  
The University ◽  
Intensive Work ◽  
Important Basis ◽  
Push Out

The deconstruction of steel-concrete composite structures in buildings and the later separation of the materials is a labour- and cost intensive work. This is due to the fact, that the shear studs are welded on the steel beam, and a large amount of cutting work gets necessary. As a result, recycling is difficult and the potential for reusing entire elements is lost. The carbon footprint of composite structures could be decreased by the application of the principles of “design for deconstruction and reuse”. This paper presents a study with its respective laboratory experiments on demountable shear connectors that facilitate recyclability and even offer the potential for reusing elements in their entirety. In the Laboratory of Steel and Composite Structures of the University of Luxembourg 15 push-out tests have been carried out using different bolted connection systems suitable for multiple uses in order to verify their performance characteristics by means of shear strength, stiffness, slip capacity, ductility and ability of demounting. The investigated systems included pre-stressed and epoxy resin injection bolts, solid slabs and composite slabs with profiled decking. The results showed that the tested demountable shear connections could provide higher shear resistance than conventional shear connections in some cases. The connection failure happened in the bolts, while there was no or minor visible damage observed on the connected members. Most of the tested connections could fulfil the ductility requirement given by Eurocode 4. The application of epoxy resin in the hole clearance resulted in lower slip capacity. The outcome will provide an important basis for the calibration of the forthcoming enhancement and numerical simulation of the demountable shear connections. The failure behaviour, the observed damages and the resulting ability of the elements for later re-use are discussed in detail.  

scholarly journals Monotonic and Fatigue Performance of Double-skin Push-out and Tensile Segments of Divers Shear Connectors – Review

2019 ◽  
Vol 22 (3) ◽  
pp. 213-221
Author(s):  
Zainab Hussam Alzahawy ◽  
Laith Khaled AL-Hadithy
Keyword(s):  
Shear Force ◽  
Shear Walls ◽  
Plain Concrete ◽  
Longitudinal Shear ◽  
Steel Plates ◽  
Composite Construction ◽  
Concrete Core ◽  
Shear Connectors ◽  
Double Skin ◽  
Push Out

Double skin composite (DSC) construction or Steel/concrete/steel sandwich construction (SCSS) is an innovative and relatively new form of composite construction that can be used in submerged tube tunnels, bridges deck, nuclear structures, liquid and gas containment structures, offshore and onshore structures, military shelters, and shear walls in buildings. The system consists of a plain concrete core sandwiched between two steel plates interconnected together by various types of mechanical shear connectors. The DSC construction perceives advantages that the external steel plates act as both formwork and primary reinforcement, and also as impermeable, blast and impact resistant membranes. The major duty of the shear connectors is to withstand longitudinal shear force and beam/slab separation, while in the bi-steel type where shear connectors are friction welded at both their two ends to two parallel steel plates, the longitudinal and transverse shear force, as well as plate buckling are resisted. The present paper highlights the previous prime researches concerning the subjects of SCSS composite construction, specifically on the conducted tests (push-out tests, tensile, direct shear tests, and bending tests) in which the components of partial interaction (uplift and slip forces) are resisted by various types of shear connectors.

scholarly journals Shear Capacity of Headed Studs in Steel-Concrete Structures: Analytical Prediction via Soft Computing

2021 ◽  
Author(s):  
Miguel Abambres ◽  
He J
Keyword(s):  
Neural Network ◽  
Analytical Model ◽  
Composite Structures ◽  
Shear Force ◽  
Longitudinal Shear ◽  
Shear Capacity ◽  
Analytical Prediction ◽  
Neural Network Approach ◽  
Shear Connectors ◽  
Headed Stud

<p>Headed studs are commonly used as shear connectors to transfer longitudinal shear force at the interface between steel and concrete in composite structures (e.g., bridge decks). Code-based equations for predicting the shear capacity of headed studs are summarized. An artificial neural network (ANN)-based analytical model is proposed to estimate the shear capacity of headed steel studs. 234 push-out test results from previous published research were collected into a database in order to feed the simulated ANNs. Three parameters were identified as input variables for the prediction of the headed stud shear force at failure, namely the steel stud tensile strength and diameter, and the concrete (cylinder) compressive strength. The proposed ANN-based analytical model yielded, for all collected data, maximum and mean relative errors of 3.3 % and 0.6 %, respectively. Moreover, it was illustrated that, for that data, the neural network approach clearly outperforms the existing code-based equations, which yield mean errors greater than 13 %.</p>

scholarly journals Cohesive Zone Model Based Numerical Analysis of Steel-Concrete Composite Structure Push-Out Tests

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
J. P. Lin ◽  
J. F. Wang ◽  
R. Q. Xu
Keyword(s):  
Numerical Analysis ◽  
Cohesive Zone ◽  
Composite Structures ◽  
Cohesive Zone Model ◽  
Constitutive Relations ◽  
Shear Stiffness ◽  
Shear Capacity ◽  
Zone Model ◽  
Shear Connectors ◽  
Push Out

Push-out tests were widely used to determine the shear bearing capacity and shear stiffness of shear connectors in steel-concrete composite structures. The finite element method was one efficient alternative to push-out testing. This paper focused on a simulation analysis of the interface between concrete slabs and steel girder flanges as well as the interface of the shear connectors and the surrounding concrete. A cohesive zone model was used to simulate the tangential sliding and normal separation of the interfaces. Then, a zero-thickness cohesive element was implemented via the user-defined element subroutine UEL in the software ABAQUS, and a multiple broken line mode was used to define the constitutive relations of the cohesive zone. A three-dimensional numerical analysis model was established for push-out testing to analyze the load-displacement curves of the push-out test process, interface relative displacement, and interface stress distribution. This method was found to accurately calculate the shear capacity and shear stiffness of shear connectors. The numerical results showed that the multiple broken lines mode cohesive zone model could describe the nonlinear mechanical behavior of the interface between steel and concrete and that a discontinuous deformation numerical simulation could be implemented.

Review on Shear Connectors in Timber-Concrete Composite Beams

2015 ◽  
Vol 744-746 ◽  
pp. 274-278
Author(s):  
Li Ping Chen ◽  
Guo Jing He ◽  
Hong Zhi Xiao
Keyword(s):  
Composite Beam ◽  
State Of The Art ◽  
Composite Beams ◽  
Structural Member ◽  
Shear Connector ◽  
Timber Beam ◽  
Shear Connectors ◽  
The Past ◽  
Different Types ◽  
New Type

The timber-concrete composite (TCC) beam is a new type of structural member, which formed by combing a timber beam and an upper concrete flange using different types of connectors. Compared with the traditional timber beam, the bending and stiffness of the composite beam is proved. In composite structure, the important factor of the structure is the shear connector. So structural efficiency of a TCC highly depends on the stiffness of the interlayer connection. This paper presents a survey on the state-of-the-art of shear connectors for TCC beam research in the past and recent years. And put forward to the subsequent study of shear connectors in TCC beams.

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