Composite Slab Report

8/3/2019 Composite Slab Report

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Composite StructuresTo Be Presented To Dr. Hisham Fawzy

Composite Slab

Group Afaf Mohammed Page 1 of 10

Name: Group Afaf MohammedLevel: 400Subject: Composite StructureCode: STE 402To Be Presented To Dr. Hisham Fawzy


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Contents: Introduction Composite Structure Composite Slab Composite Slab Design Profile Design Design Calculation References Members of Group

1.1) Introduction: In this Report we will be discussing the design of composite slab using different corrugated

sheet profiles, but first we will mention the idea of composite structure then we will discussingthe concept of the composite slab and finally using the different corrugated sheet profile wewill calculate the maximum resisting moment that each profile can withstand.

1.2) Composite Structure:

Composite Structures are structures made up of more than 1 material that work together eachmaterial carries the type of stress that it is suited for; for example in composite slabs concretecarries compressive stress while steel (Corrugated sheet) carries the tensile stress.

Composite Structures reduce labor cost but needs skilled labor to execute but the mostbeneficial use of composite structures is that is reduces construction time as it is faster toexecute.

Types of Composite structures: o Composite Slab which consists of corrugated deck and concrete .o Composite Beam which consists of steel section, shear connectors and solid/composite

slab .o Composite Column and Frames like steel pipe filled with concrete or steel section

enclosed within a concrete column. A composite material is basically a combination of two or more materials, each of which

retains its own distinctive properties. The concept of composite materials is ancient. Anexample is adding straw to mud for building stronger mud walls. Most commonly, compositematerials have a bulk phase, which is continuous, called the matrix; and a dispersed, non-continuous, phase called the reinforcement. Some other examples of basic composites includeconcrete (cement mixed with sand and aggregate), reinforced concrete (steel rebar inconcrete), and fiberglass (glass strands in a resin matrix).


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1.3) Composite Slab: Composite Slab which as we said before consisted a steel deck and a concrete slab with means

of interlock between these 2 materials these interlocks can be either: o Mechanical Interlock where interlock is achieved via mechanical bonds due to

different physical interlock mechanisms in the corrugated sheet via ribs in sheets. o Chemical Interlock where interlock is achieved via chemical bonds between 2

materials which act as the glue which keep material tacked with each other. o Frictional Interlock: natural bond occurring between any 2 materials.

1.4) Composite Slab Design: The fundamental design concept of composites is that the bulk phase accepts the load over a

large surface area, and transfers it to the reinforcement material, which can carry a greater

load. The Idea is to load each element with the type of stress it is design to withstand, where thesteel reinforcement can withstand tension stress and the concrete is designed to withstand thecompressive stress.

In the design process we usually design on 2 stages;o The first stage is the construction stage during construction, the profiled steel deck

acts alone to carry the weight of wet concrete, self weight, workmen and equipments.It must be strong enough to carry this load and stiff enough to be serviceable under theweight of wet concrete only.

o The second stage is called the composite stage where the slab is permanently designedto carry the permanent loads which are expected to be carried by the composite slabwhich will consists of the corrugated sheet as well as the concrete part, the loads inthis stage are the loads of hard concrete, finishing and false ceiling, partition loads aswell as live load.

1.5) Profile Design: In Our Example we used profiles from a company called TATA Steel which specializes in

steel structures and one of which is the composite floor decking (ComFlor). The Profile type we used is called (ComFlor 46) which has the following properties which will

be listed in the design calculations, also the whole brochure will be attached to the word filefor checking of any information if required.

Here is the part of the brochure from which the properties of section was acquired:


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1.6) Design Calculation: Given:

o Moment of Resistance of Section Only (M pa ) = 4.63 KN.m/m o Thickness of Concrete above Corrugated Sheet (T) = (h c) = 10 cm (Assumption)o Centroid of Corrugated Sheet (e) = 23 mm o Modulus of Elasticity of Corrugated Sheet (E a) = 2100 t/cm 2 o Inertia of Corrugated Sheet (I p) = 41.5 cm 4 o Yield Strength of Corrugated Sheet (Fy bd) = 550 Mpa o Area of Corrugated Sheet per 1 meter (A p) = 1137 mm 2 /m' o Width of Single Corrugation (b 0) = (120+67)/2 = 93.5 mm o Width of Corrugation (b) = 225 mm o Yield Strength of Concrete (f cu) = 250 Kg/cm 2

Calculations:o Ncf = 0.85 Fc bd* X * b = A p* Fy pd = 0.85 * (25/1.5) * X * 1 =1137 * (0.55/1.15)

So X = 44.14 mm .Since Hc =100 mm (Assumed), So X < hc neutral axis in concrete

o MRd = N cf *( db 0.5 X ) where d p = h- e = 146 -23 = 133 mm MRd = 625.35 * (0.123 0.5 * 0.4414) = 63.11 KN.m/m (Resisting Moment of Section)

o V min = 0.035 * 25 0.5 * ( ) (1.5) = 0.6 N/mm 2, So

VRd =

*123 * 0.6 = 30.7 KN/m (Resisting Shear of Section)


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1.7) References:o http://www.wikipedia.org/ o http://www.tatasteelconstruction.com/en/about_us/panels_profiles/structural_products_systems/comflor/comflor _range/comflor210/

1.8) Members: Ahmed Moustafa Mohammed

ElSaid Mohammed Reda Afaf Mohammed May Ahmed Norhan Samir

Thank You for Reading By Group Afaf
http://www.wikipedia.org/http://www.wikipedia.org/http://www.wikipedia.org/http://www.tatasteelconstruction.com/en/about_us/panels_profiles/structural_products_systems/comflor/comflor_range/comflor210/http://www.tatasteelconstruction.com/en/about_us/panels_profiles/structural_products_systems/comflor/comflor_range/comflor210/http://www.tatasteelconstruction.com/en/about_us/panels_profiles/structural_products_systems/comflor/comflor_range/comflor210/http://www.tatasteelconstruction.com/en/about_us/panels_profiles/structural_products_systems/comflor/comflor_range/comflor210/http://www.tatasteelconstruction.com/en/about_us/panels_profiles/structural_products_systems/comflor/comflor_range/comflor210/http://www.tatasteelconstruction.com/en/about_us/panels_profiles/structural_products_systems/comflor/comflor_range/comflor210/http://www.wikipedia.org/

Composite Slab Report

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