scholarly journals REVIEW OF VARIOUS SHEAR CONNECTORS IN COMPOSITE STRUCTURES

2021 ◽  
Keyword(s):  
Composite Structures ◽  
State Of The Art ◽  
Concrete Slabs ◽  
Composite Action ◽  
Shear Connectors ◽  
Shear Connection ◽  
Reinforced Concrete Slabs ◽  
Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Strength And Stiffness

Shear connectors are devices that provide shear connection at the interface of steel girders and reinforced concrete slabs in composite structures to accomplish composite action in a flexure. The seismic response of composite structures can be controlled using properly designed shear connectors. This state-of-the-art review article presents considerable information about the distinct types of shear connectors employed in composite structures. Various types of shear connectors, their uniqueness and characteristics, testing methods and findings obtained during the last decade are reviewed. The literature, efficacy, and applicability of the different categories of shear connectors, for example, headed studs, perfobond ribs, fibre reinforced polymer perfobonds, channels, pipes, Hilti X-HVB, composite dowels, demountable bolted shear connectors, and shear connectors in composite column are thoroughly studied. The conclusions made provide a response to the flow of the use of shear connectors for their behaviours, strength, and stiffness to achieve composite action.

Combined effect of sustained load and freeze–thaw cycles on one-way concrete slabs reinforced with glass fibre – reinforced polymer

2013 ◽  
Vol 40 (11) ◽  
pp. 1060-1067 ◽  
Author(s):  
Hizia Bellakehal ◽  
Ali Zaidi ◽  
Radhouane Masmoudi ◽  
Mohamed Bouhicha
Keyword(s):  
Reinforced Concrete ◽  
Shear Capacity ◽  
Concrete Slabs ◽  
Thermal Cycles ◽  
Bending Tests ◽  
Freeze Thaw ◽  
Reinforced Concrete Slabs ◽  
Reinforced Polymer ◽  
Significant Difference ◽  
Fibre Reinforced Polymer

Flexural behaviour of reinforced-concrete slabs has been widely investigated to characterize properties and behaviour of fibre-reinforced polymer (FRP) materials as reinforcement for concrete structures. However, the short- and long-term thermal effects on FRP bars owing to the significant difference between the bars’ coefficients of thermal expansion in the transverse and longitudinal directions are still to be evaluated and may affect the bond properties and the concrete cover thickness after multiple exposures to freeze–thaw cycles. This paper presents the thermostructural behaviour of one-way concrete slabs reinforced with glass FRP (GFRP) that have previously been subjected to mechanical loads of 20% and 30% of the ultimate flexural capacity of reinforced-concrete slabs, simultaneously with short freeze–thaw cycles. Series tests were conducted on FRP-reinforced concrete slabs 500 mm wide, 195–215 mm thick, and 2500 mm long. The thermal cycles were varied from −30 to 60 °C. Four-point bending tests were conducted up to failure of the slabs. The results show that the thermomechanical load applied before bending tests increases the performance of reinforced-concrete slabs, particularly the concrete shear capacity. The deflection predicted from CSA code and ACI guidelines are very close to those obtained from experimental tests; however, the CSA code overestimates the deflection at the service load. The applied thermal cycles have no big influence on the behaviour before shear failure of concrete slabs reinforced with GFRP bars.

scholarly journals Shear Connection between Steel and Concrete in Composite Structure

2019 ◽  
Vol 8 (12S) ◽  
pp. 17-23
Keyword(s):  
Concrete Slabs ◽  
Structural Elements ◽  
Composite Construction ◽  
Concrete Element ◽  
Shear Transfer ◽  
Composite Action ◽  
Shear Connectors ◽  
Shear Connection ◽  
The Past ◽  
Structural Aspects

For the past few decades, the construction field has been moving towards the usage of steel-concrete composite structural elements in most of its construction. Various research works are carried out to increase the structural aspects of such composite construction. Shear connector between concrete and steel elements in composite construction plays an important role in developing the composite action by ensuring proper shear transfer between the steel profile and the concrete element. The connections between the steel and concrete sections are mostly done using welding, given the durability and strength of welding. For the current study, the shear connectors, connecting the concrete slabs and steel beam, are welded to the flanges of the beam. Given the flexible nature of the shear connectors, they can be available in various shapes and sizes. The performance of each connector was evaluated and compared. The main comparison between the specimens was carried out by comparing the load slip behavior of the specimens.

Fibre reinforced polymer composite bars for the structural concrete slabs of a Public Works and Government Services Canada parking garage

2004 ◽  
Vol 31 (5) ◽  
pp. 732-748 ◽  
Author(s):  
Brahim Benmokrane ◽  
Ehab El-Salakawy ◽  
Zoubir Cherrak ◽  
Allan Wiseman
Keyword(s):  
Experimental Tests ◽  
Design Guidelines ◽  
Public Works ◽  
Concrete Slabs ◽  
Parking Garage ◽  
Government Services ◽  
Reinforced Concrete Slabs ◽  
Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Frp Bars

Public Works and Government Services Canada (PWGSC) is currently undertaking the reconstruction of the interior structural slabs of the Laurier-Taché parking garage (Hull, Quebec). An agreement between PWGSC and the Université de Sherbrooke was reached to use fibre reinforced polymer (FRP) reinforcement technology in some demonstration areas of the Laurier–Taché parking garage. Based on this agreement, three different designs using carbon and glass FRP bars were carried out in collaboration with the project consultant. These designs were made according to CAN/CSA-S806-02, Design and Construction of Building Components with Fibre-Reinforced-Polymers. To verify the design, it was agreed to conduct laboratory testing on full-scale slab prototypes of the proposed designs. This paper presents the results of the experimental tests where six full-sized one-way slabs were constructed and tested. The slabs were 3100 mm long × 1000 mm wide × 150 mm deep and were tested under four-point bending. The test results along with a comparison to the predictions of CAN/CSA-S806-02 Code and ACI 440.1R-03 design guidelines are presented. Recommendations for design of FRP-reinforced concrete slabs are also given.Key words: concrete slabs, parking garages, FRP bars, flexural behaviour, cracking, deflection.

Analysis of Performance of Local Puzzle Sheet in a Joint Made of UHPC

2018 ◽  
Vol 272 ◽  
pp. 141-146
Author(s):  
Pavel Jursík ◽  
Jan L. Vítek ◽  
David Čítek
Keyword(s):  
Composite Structures ◽  
Concrete Slab ◽  
Experimental Measurements ◽  
Composite Action ◽  
Shear Connectors ◽  
Shear Connection ◽  
High Bond ◽  
Key Features ◽  
Precast Elements ◽  
Analysis Of Performance

Nowadays the extraordinary mechanical properties of UHPC can be used for real structures. The exceptionally high bond of reinforcement and UHPC together with significant shortening of lap length are the key features for the simplification of joining of precast elements. The properties of UHPC can be very well used also for providing of subsequent shear connection of composite structures. This paper is focused on analysis of performance of a combined joint where connection of precast elements as well as subsequent composite action between steel and concrete parts of steel-concrete composite structure are carried out in one compact detail. Instead of the traditional headed shear studs there were used local perforated puzzle sheets. More resilient connection of shear sheets to the top flange and a high resistance of UHPC allow for reduction of the extent of shear connectors. In experimental measurements carried out on six beams the behavior of shear connection of conventional monolithic concrete slab with continuous perforated shear sheet and shear connection of precast slab with the joint made of UHPC with local puzzle sheets were compared. During the experiment it has been proven that the performance of the beams with both variants of shear connection is very similar even with the significant reduction of the extent of shear connectors. Numerical analysis which describes the stressing in this detail confirms such behavior.

Experimental study of the strength and deformations of carbon fibre reinforced polymer (CFRP) retrofitted reinforced concrete slabs under blast loadThis article is one of a selection of papers published in the Special Issue on Blast Engineering.

2009 ◽  
Vol 36 (8) ◽  
pp. 1366-1377 ◽  
Author(s):  
A. Ghani Razaqpur ◽  
Ettore Contestabile ◽  
Ahmed Tolba
Keyword(s):  
Reinforced Concrete ◽  
Carbon Fibre ◽  
Concrete Slabs ◽  
Cfrp Laminates ◽  
Reinforced Concrete Slabs ◽  
Reinforced Polymer ◽  
Blast Response ◽  
Carbon Fibre Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Complete Failure

The blast response and ultimate resistance of reinforced concrete slabs externally strengthened with carbon fibre reinforced polymer (CFRP) laminates were investigated. Five square slab specimens, 1 m on a side, were retrofitted with 500 mm wide CFRP laminates bonded to their top and bottom surfaces. Another four nominally identical unretrofitted slabs were used as control specimens. Four of the retrofitted and the four control slabs were first subjected to the detonation of either 22.4 or 33.4 kg of explosive at a stand-off distance of 3.0 m. For reference, the fifth retrofitted slab was only statically tested to failure. Blast pressures and impulses and slab deformations were measured. After exposure to the blast, the slabs that were not completely damaged were statically tested to failure. Overall the retrofitted slabs performed better than the control slabs, but one retrofitted slab completely failed under the blast load while none of the control slabs experienced complete failure under similar load.

scholarly journals Experimental evaluation on the structural behavior of truss shear connectors in composite steel-concrete beams

2019 ◽  
Vol 12 (5) ◽  
pp. 1157-1182 ◽  
Author(s):  
W. C. S. BARBOSA ◽  
L. M. BEZERRA ◽  
L. CHATER ◽  
O. R. O. CAVALCANTE
Keyword(s):  
Composite Structures ◽  
Concrete Slab ◽  
Experimental Studies ◽  
Experimental Models ◽  
Concrete Slabs ◽  
Shear Connectors ◽  
Reinforced Concrete Slabs ◽  
Constituent Material ◽  
Steel Composite ◽  
Stud Connector

Abstract The composite structures have great advantages in terms of structural and constructive aspects, with the shear connectors being decisive for obtaining the interaction between the structural elements and for the distribution of the stresses in the structure, taking advantage of the potentiality of each constituent material of the composite structure (steel and concrete). This work, through experimental studies, presents the development of a shear connector (Truss connector) proposed for use in a concrete-steel composite beam. The proposed connector is easy to implement and can serve as a viable alternative to the use of stud or U connectors. It was idealized a connector geometry that would provide low production cost, ease of execution, higher values of resistant load, efficiency as regards the relative sliding resistance between the metal profile and the concrete slab, as well as the efficiency regarding the resistance to the spacing of the slabs in relation to the metal profile (uplift). In order to evaluate the behavior of Truss connectors, 6 experimental models were constructed for push-out tests, 3 with 12.5 mm diameter Truss connectors and 3 with 19.0 mm diameter stud bolt connectors. The behavior of the models was investigated with respect to the loads of rupture, the transversal displacements between the concrete slabs and the relative vertical slide between the reinforced concrete slabs and the metallic profiles of the models. The results of the experimental analyzes provided an overview of the operation of the Truss and stud bolt connectors, with significant results that showed advantages of the Truss connector in relation to the stud connector considering the parameters analyzed in this work.

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.

Thermal effect on fiber reinforced polymer reinforced concrete slabs

2008 ◽  
Vol 35 (3) ◽  
pp. 312-320 ◽  
Author(s):  
A. Zaidi ◽  
R. Masmoudi
Keyword(s):  
Thermal Effect ◽  
Concrete Cover ◽  
Fiber Reinforced Polymer ◽  
Concrete Slabs ◽  
Fiber Reinforced ◽  
Reinforced Concrete Slabs ◽  
Reinforced Polymer ◽  
Frp Bar ◽  
Frp Bars ◽  
Concrete Interface

The difference between the transverse coefficients of thermal expansion of fiber reinforced polymer (FRP) bars and concrete generates radial pressure at the FRP bar – concrete interface, which induces tensile stresses within the concrete under temperature increase and, eventually, failure of the concrete cover if the confining action of concrete is insufficient. This paper presents the results of an experimental study to investigate the thermal effect on the behaviour of FRP bars and concrete cover, using concrete slab specimens reinforced with glass FRP bars and subjected to thermal loading from –30 to +80 °C. The experimental results show that failure of concrete cover was produced at temperatures varying between +50 and +60 °C for slabs having a ratio of concrete cover thickness to FRP bar diameter (c/db) less than or equal to 1.4. A ratio of c/db greater than or equal to 1.6 seems to be sufficient to avoid splitting failure of concrete cover for concrete slabs subjected to high temperatures up to +80 °C. Also, the first cracks appear in concrete at the FRP bar – concrete interface at temperatures around +40 °C. Comparison between experimental and analytical results in terms of thermal loads and thermal strains is presented.

Sign in / Sign up

Export Citation Format

Share Document