Composite floor system with cold‐formed trussed beams and prefabricated concrete slab

2020 ◽  
Vol 13 (1) ◽  
pp. 12-21
Author(s):  
Luiz Alberto Araújo de Seixas Leal ◽  
Eduardo de Miranda Batista
Keyword(s):  
Concrete Slab ◽  
Floor System

Deflections of a composite floor system

1983 ◽  
Vol 10 (2) ◽  
pp. 192-204 ◽  
Author(s):  
C. J. Montgomery ◽  
G. L. Kulak ◽  
G. Shwartsburd
Keyword(s):  
Case History ◽  
Concrete Slab ◽  
Steel Beam ◽  
History Of ◽  
Load Tests ◽  
Floor System ◽  
Creep And Shrinkage ◽  
Composite Floors

A case history of a steel beam – concrete slab composite floor system which had deflection serviceability problems is presented. Load tests carried out to assess the structural adequacy of the floor system are described. Practical methods for predicting elastic, creep, and shrinkage deflections of composite floors are summarized and recommendations for design are made.

scholarly journals Structural Behavior of Composite Floor System Using Cold-Formed Thin-Walled C Steel Channel Embedded Foam Concrete

2021 ◽  
Vol 11 (21) ◽  
pp. 9888
Author(s):  
Dianzhong Liu ◽  
Feng Fu ◽  
Wanjuan Liu
Keyword(s):  
Failure Modes ◽  
Concrete Slab ◽  
Structural Behavior ◽  
Test Results ◽  
Foam Concrete ◽  
Flexural Capacity ◽  
Composite Slab ◽  
New Type ◽  
Thin Walled ◽  
Floor System

In this paper, a new composite floor system using cold-formed thin-walled C steel channel embedment and a foam concrete slab is developed. This new type of floor system features lightweight, high fire-resistant, and high anti-corrosion features, and can be used for multi-story buildings, providing a promising new alternative floor system for the construction market. Two four-point bending tests were carried out to investigate the flexural capacity and failure modes of this new type of composite slab. Based on the test results, a nonlinear finite element model was developed using general software package ABAQUS. The model is validated using the test results. Using this model, parametric studies were performed to study the key parameters affecting the structural behavior of this new type of composite floor system. Different parameters such as density of the foam concrete, grade of the cold-formed thin-walled C steel channel embedment, and spacing of the cold-formed thin-walled C steel channel were investigated. Their contributions to the overall moment capacity and their effect on the failure modes of this type of composite slab were discovered. Based on experimental results and FE results, design formulas for ultimate flexural capacity of this new type of composite slabs were also developed which can accurately predict their flexural capacity.

scholarly journals Composite floor system with CFS trussed beams, concrete slab and innovative shear connectors

2020 ◽  
Vol 73 (1) ◽  
pp. 23-31 ◽  
Author(s):  
Luiz Alberto Araújo de Seixas Leal ◽  
Eduardo de Miranda Batista
Keyword(s):  
Concrete Slab ◽  
Shear Connectors ◽  
Floor System

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 Experimental investigations on the load bearing behaviour of an innovative prestressed composite floor system in fire

2018 ◽  
Author(s):  
Patrick Meyer ◽  
Peter Schaumann ◽  
Martin Mensinger ◽  
Suet Kwan Koh
Keyword(s):  
Fire Resistance ◽  
Large Scale ◽  
Concrete Slab ◽  
Experimental Investigations ◽  
Load Bearing ◽  
Natural Fire ◽  
Fire Scenario ◽  
Standard Fire ◽  
Hollow Space ◽  
Floor System

In Germany, regulations for hollow spaces in slab systems require 30 minutes standard fire resistance of the load-bearing steel construction. Within a current national research project a natural fire scenario for the hollow space was developed based on realistic fire loads and ventilation conditions in the hollow space. Assuming this realistic fire scenario in the hollow space, two large scale tests on an innovative composite floor system were performed to evaluate the influence on the load bearing behaviour of the floor system. The integrated and sustainable composite floor system consists of a prestressed concrete slab, an unprotected, bisected hot rolled I-profile with composite dowels either in puzzle or clothoidal shape, and removable floor panels on the top of the I-profile. This floor system ensures the opportunity to adjust the technical building installations in accordance with the use of the building. This integrated and sustainable composite floor system was developed in several research projects. The standard fire resistance R90 for the fire scenario below the slab system has already been proven successfully. In this paper, experimental investigations regarding the heating and load bearing behaviour of the innovative composite floor system under the newly developed natural fire scenario of hollow spaces are presented. In doing so, the special test set-up to realise the fire tests for the fire scenario hollow space will be described in detail. After the fire scenario for the hollow space, the specimen was subjected to the ISO standard fire curve to establish the failure temperature of the unprotected I-profile. In addition to the temperature development and the load bearing behaviour inside the innovative floor during the heating phase, the cooling phase and the influence of a web opening on the load bearing behaviour will be discussed.

Proof testing of a noncomposite floor system

1979 ◽  
Vol 6 (4) ◽  
pp. 634-639
Author(s):  
Ram S. Ghosh
Keyword(s):  
Maximum Stress ◽  
Concrete Slab ◽  
Critical Section ◽  
Bridge Structure ◽  
System Construction ◽  
Strain Measurements ◽  
Proof Testing ◽  
Service Load ◽  
Beam Bridge ◽  
Floor System

A suspended concrete slab in a noncomposite floor system construction exhibited cracking in the upper surface, which was considered to be aggravated by the movement of heavy steel wheeled trolleys. A critical section of the floor was carefully instrumented for deflection and strain measurements and readings were taken with the heaviest service load at locations for maximum stress. The results established that the resulting induced stresses were relatively small, well below the allowable working values, which confirmed the prognosis that the complete floor was acting as an I-beam bridge structure. Accordingly, the floor was considered adequate to carry the 23.5 ton (21.3 Mg) moving trolley load.

scholarly journals Connection Performance for LVL-Concrete Composite Floor System

2015 ◽  
Vol 773-774 ◽  
pp. 954-963
Author(s):  
Lee Yen Fong ◽  
Nor Hayati Abd Ghafar ◽  
Norashidah Abd Rahman ◽  
David Yeoh
Keyword(s):  
Concrete Slab ◽  
Low Cost ◽  
Shear Capacity ◽  
Limit States ◽  
Composite Action ◽  
Strength And Stiffness ◽  
Floor System ◽  
Type Of Failure ◽  
Push Out ◽  
Rectangular Notch

The LVL-concrete composite (LCC) structure is a hybrid in system which the LVL member is well connected to the concrete slab by a connector to produce composite action. Various types of connector with different stiffness and shear capacity are available in the market currently. The stiffness of the connector is identified through the push-out experiment. The notch connections for LVL concrete composite beams have higher stiffness and strength compared to mechanical fasteners. This paper discusses the experimental results of symmetrical push-out tests on 3 different types of connector, 150mm rectangular notch with 10mm diameter screw, 100mm rectangular notch with 8mm diameter screw and 100mm triangular notch with 8mm diameter screw. The experimental test was shear push out to failure and the type of failure was discussed. The 150mm rectangular notch was found to be strongest among all and low cost. The 100mm rectangular notch was found to be slightly stiffer than 100mm triangular notch but 100mm triangular notch is easier to construct with only 2 cut. The maximum strength and stiffness at ultimate limit states and serviceability limit states of each type of connection were discussed in this paper.

scholarly journals Improvement of a Truss-Reinforced, Half-Concrete Slab Floor System for Construction Sustainability

2021 ◽  
Vol 13 (7) ◽  
pp. 3731
Author(s):  
Jiarui Qi ◽  
Hsi-Chi Yang
Keyword(s):  
Concrete Slab ◽  
Experimental Tests ◽  
Construction Cost ◽  
Steel Tube ◽  
Structural Performance ◽  
Initial Stiffness ◽  
Component Design ◽  
Steel Bar ◽  
Component Form ◽  
Floor System

The truss-reinforced half-concrete slab has been widely used in prefabricated construction all over the world. It has become the most widely used prefabricated component form in China. However, its construction cost is higher than using the conventional construction method. To improve the half slab floor system, it is essential to have a comprehensive understanding of the truss-reinforced half slab’s structural performance over its complete loading history. Six experimental tests on such slabs were carried out. Three of them were reinforced with a steel bar truss (SBT) and the other three with a steel tube/bar truss (STBT). The steel tube in an STBT was grouted. The results show that when the specimen is damaged, the grouted steel tube does not undergo out-of-plane or in-plane buckling, and its force performance is good when compared to the steel bar in SBT. Compared with the SBT-reinforced slab specimens, the load characteristic values of the STBT-reinforced slabs were significantly improved, and the slabs had greater initial stiffness and resistance to deformation. Due to the fact that good structural performance of the steel tube was observed, after having studied the half slab component design, a dry, prefabricated, STBT-reinforced half slab system that can reduce the volume of concrete and amount of steel used in the present slab system is proposed. The proposed system has the advantages of allowing easier construction, cost reduction, and reuse of the components afterward to make the prefabrication construction more sustainable.

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