Effects of upper surface layers on the vibration characteristics of floating floor systems in concrete slab structures

2012 ◽  
Vol 131 (4) ◽  
pp. 3320-3320
Author(s):  
Jae Ho Kim ◽  
Jin Yong Jeon
Keyword(s):  
Concrete Slab ◽  
Vibration Characteristics ◽  
Surface Layers ◽  
Floor Systems

scholarly journals Semi-continous beam-to-column joints for slim-floor systems in seismic zones

2018 ◽  
Author(s):  
Adrian Ciutina ◽  
Cristian Vulcu ◽  
Rafaela Don
Keyword(s):  
Finite Element ◽  
Concrete Slab ◽  
Bending Moment ◽  
Steel Structures ◽  
Bending Test ◽  
Steel Beams ◽  
Element Analysis ◽  
Natural Fire ◽  
Floor Systems ◽  
Moment Resisting

The slim-floor building system is attractive to constructors and architects due to the integration of steel beam in the overall height of the floor, which leads to additional floor-to-floor space, used mostly in acquiring additional storeys. The concrete slab offers natural fire protection for steel beams, while the use of novel corrugated steel sheeting reduces the concrete volume, and replaces the secondary beams (for usual spans of steel structures). Currently the slim-floor solutions are applied in non-seismic regions, and there are few studies that consider continuous or semi-continuous fixing of slim-floor beams. The present study was performed with the aim to develop reliable end-plate bolted connections for slim-floor beams, capable of being applicable to buildings located in areas with seismic hazard. It is based on numerical finite element analysis, developed in two stages. In a first stage, a finite element numerical model was calibrated based on a four point bending test of a slim-floor beam. Further, a case study was analysed for the investigation of beam-to-column joints with moment resisting connections between slim-floor beams and columns. The response was investigated considering both sagging and hogging bending moment. The results are analysed in terms of moment-rotation curve characteristics and failure mechanism. 

Theoretical Analysis of SSCC Floor System of through Truss High-Speed Railway Bridges

2011 ◽  
Vol 250-253 ◽  
pp. 1728-1733 ◽  
Author(s):  
Ye Zhi Zhang ◽  
Liang Chen
Keyword(s):  
High Speed ◽  
Concrete Slab ◽  
Axial Stress ◽  
Bending Moment ◽  
Bending Stress ◽  
Inertia Moment ◽  
High Speed Railway ◽  
Railway Bridges ◽  
Floor Systems ◽  
Floor System

In SSCC floor systems the concrete slab is composite with both steel stringers and crossbeams or only with stringers. The horizontal bending of the crossbeams of SSCC floor systems is not ignorable. From the deformation conforming condition, theoretical formulas for SSCC floor systems of double-railway bridges with two stringers are developed. The factors which influence the horizontal bending of crossbeams are discussed. Some conclusions are obtained. When the width of the SSCC floor system is given, the main factors which influence the horizontal bending of the crossbeams are the axial stress of the lower chords, the distance between the side stringers and the lower chords, and the continuous length of SSCC floor system. Increasing the horizontal inertia moment of crossbeams almost cannot reduce the horizontal bending stress of crossbeams. A slight horizontal rotation of the lower joints such as 10-4 rad can release more than 3% crossbeam end horizontal bending moment.

scholarly journals Enhancement of Shear Transfer in Composite Deck with Mechanical Fasteners

2018 ◽  
Author(s):  
Christopher McComb ◽  
Fariborz Tehrani
Keyword(s):  
Concrete Slab ◽  
Steel Beams ◽  
Initial Stiffness ◽  
Additional Increase ◽  
Shear Transfer ◽  
Composite Action ◽  
Construction Methods ◽  
Reinforcing Fibers ◽  
Floor Systems ◽  
Steel Deck

Reinforced concrete construction and steel construction are two of the most common contemporary construction methods. Both methods make use of composite decks as floor systems and diaphragms. During the design of composite decks, the interaction between the steel deck and concrete slab is typically disregarded when calculating the strength of the composite di- aphragm due to lack of complete shear transfer, as existing practices such as stamping are not effective to provide substantial composite action. This conservative assumption essentially results in non-efficient use of material. This paper presents a method for ensuring shear transfer through the use of conventional sheet metal screws, driven through the corrugated steel deck and embedded in the fresh concrete. This method is proposed for use in the field between formed steel beams. Both experimental and analytical stud- ies support an increase in strength with the addition of embedded fasteners. Further, experimental results indicate an additional increase in strength with the addition of synthetic reinforcing fibers. The increase in strength with the addition of the fasteners is on the order of 100%. When fasteners are already in use, the addition of synthetic reinforcing fibers can increase strength on the order of 10%. The ultimate deflection of enhanced deck is comparable to deck tested without fasteners, but the initial stiffness of enhanced deck is much higher.

scholarly journals Plate with holes as shear connector in cold formed steel composite beams

2019 ◽  
Vol 12 (3) ◽  
pp. 509-517
Author(s):  
O. P. AGUIAR ◽  
R. B. CALDAS ◽  
F. C. RODRIGUES ◽  
H. N .BELLEI
Keyword(s):  
Concrete Slab ◽  
Composite Beams ◽  
Shear Connector ◽  
Reinforced Concrete Slab ◽  
Relative Slip ◽  
Floor Systems ◽  
Composite Section ◽  
Support Area ◽  
Steel Composite ◽  
Cold Formed Steel

Abstract In search of an improved compatibility between cold-formed steel profiles and precast floor systems, this study proposes an alternative shear connector for cold-formed steel-concrete composite beams. This connector consists of a steel plate with holes placed longitudinally in the middle of the upper flange of the steel profile, aiming to maximize the support area for precast slabs during the assembly. The proposed solution was experimentally tested on I-beams under bending, composed by two cold-formed steel channels, connected to a reinforced concrete slab by the shear connector. The relative slip between the steel profile and concrete, vertical deflection of the beam, and strains at several locations of the composite section were measured. The results show that the proposed connector assures shear transfer at the interface of the composite section components and shows strength of the same magnitude as other commonly used connectors.

scholarly journals Experimental study of shear transfer in slim floor systems using precast concrete hollow core slabs and steel beam with web circular opening

2022 ◽  
Vol 15 (3) ◽  
Author(s):  
Gustavo Coldebella ◽  
Sineval Esteves Pereira Junior ◽  
Silvana De Nardin
Keyword(s):  
Analytical Methods ◽  
Concrete Slab ◽  
Precast Concrete ◽  
Steel Beam ◽  
Hollow Core ◽  
Web Openings ◽  
Shear Connection ◽  
Web Opening ◽  
Bending Resistance ◽  
Floor Systems

Abstract Steel-concrete slim flooring system using precast concrete hollow core slabs and steel beam with web openings is an innovative construction system designed to combine the high bending resistance of both precast prestressed hollow core slabs and steel beam with web openings. This system can provide floor systems with a minimum constructional depth in comparison with ordinary composite floors. The aim of this study was to evaluate in an exploratory way the shear transferring mechanism between the steel beam with circular web opening and the precast hollow-concrete slab. The shear connection is formed by in-situ concrete passes through the web openings and infill the voids of the precast slabs. One push-out test was conducted to investigate the shear transferring mechanism of shear connection and the experimental results were compared to analytical methods. The shear resistance of the shear connection was predicted with good accurate by analytical methods.

scholarly journals Experimental Investigation on Behavior of Composite Open Web Steel Joists

2018 ◽  
Vol 21 (3) ◽  
pp. 393-404
Author(s):  
Ali Farhan Hadeed ◽  
Laith Khalid Al-Hadithy ◽  
Riyadh J. Aziz
Keyword(s):  
Concrete Slab ◽  
Light Weight ◽  
Shear Connector ◽  
Test Results ◽  
Variable Parameters ◽  
Shear Connectors ◽  
Shear Connection ◽  
Strength Capacity ◽  
Floor Systems ◽  
The Web

The composite opened web steel joist supported floor systems have been common for many years. It is economic and has light weight and can embed the electrical conduit, ductwork and piping, eliminating the need for these to pass under the member, consequently eliminate the height between floors. In order to study the joist strength capacity under the various conditions, it had been fabricated seven joists composed of the steel and concrete slab connected to the top chord by shear connectors (headed studs). These joist have 2820 mm length c/c of the supports and 235 mm overall depth. In the present study, six variable parameters are adopted (Studs distribution, Degree of shear connection, Degree of the web inclination, Shape of the web, Density of concrete for slab and length of the shear connector). The test results exhibited that minimum strength capacity was 160kN for light weight joist and maximum capacity was 225kN for joist of long shear connectors at failure. The results were compared by ultimate flexural model by Azmi.

scholarly journals Innovative Lightweight Cold-Formed Steel-Concrete Composite Floor System – LWT-FLOOR project

2021 ◽  
Vol 1203 (3) ◽  
pp. 032078
Author(s):  
Ivan Lukačević ◽  
Ivan Ćurković ◽  
Andrea Rajić ◽  
Ivan Čudina
Keyword(s):  
Concrete Slab ◽  
Cost Effective ◽  
Steel Buildings ◽  
Steel Members ◽  
Floor Systems ◽  
New Construction ◽  
Building Components ◽  
Cold Formed Steel ◽  
Floor System ◽  
High Degree

Abstract To provide the foundations for economic and social prosperity, countries worldwide need to be making a term investment in their building assets. However, there is a lack of a systematic approach, such as manufacturing innovations, to maximize the values of building components and materials in its entire lifecycle. Steel-concrete composite floor systems are one of the most cost-effective construction systems for multi-storey steel buildings because they combine structural efficiency with the speed of construction. These advantages depend on the efficiency of combining steel and concrete structural elements to avoid their inherent disadvantages. This paper presents a solution that integrates state-of-the-art knowledge in new, fast and productive spot-welding technology and innovative cold-formed steel-concrete composite solutions. The solution proposes a new construction method as a combination of built- up cold-formed steel members and cast-in-place concrete slab. The proposed floor system offers key benefits in terms of a high degree of prefabrication, reusability and long spanning capability.

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