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L02 Steel Design KAEA3218

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  9/30/20141 Dr. MeldiSuhatril Department of Civil Engineering,Faculty of Engineering, University of Malaya. STRUCTURAL STEEL DESIGN (KAEA3218) -Steel properties-  ã Betterqualitycontrol ã Lighter ã Fastertoerect ã Reducedsitetime–Fasttrackconstruction ã Largecolumnfreespaceandamenableforalteration ã Lessmaterialhandlingatsite ã Lesspercentageoffloorareaoccupiedbystructuralelements ã Hasbetterductilityandhencesuperiorlateralloadbehavior;betterearthquakeresistance Advantages of Steel Design  1.Advantages & Disadvantages 2.Properties-Material-Mechanical3.Steel Section-Hot Rolled-Cold form-Built-up4. Section Properties5.Structural Design6.Limit State Design ã Skilledlaborisrequired ã Highercostofconstruction ã Maintenancecostishigh ã Poorfireproofing,asat1000 ° F(538 ° C)&at1600 ° F(871 ° C)15%strengthremains ã Electricitymayberequired Disadvantage of Steel Design  1.Advantages & Disadvantages 2.Properties-Material-Mechanical3.Steel Section-Hot Rolled-Cold form-Built-up4. Section Properties5.Structural Design6.Limit State Design ã SteelisanalloyofIron,Carbon(<2%),and Manganese(<1%).Italsocontainssmallamountsof Phosphorous,Silicon,SulfurandOxygen. ã CarbonSteel-thesechemicalelementsarecontrolledtoprovideconsistentqualityandgradeof steel ã Carboncontentgreatlyaffectsthepropertiesofsteel:  MoreCarbonincreases:strength,hardness,corrosion-resistance  MoreCarbondecreases:malleability,ductility,andweldability  TheamountofCarbondoesNOTaffecttheModulusofElasticity(E)oftheSteel Material Properties of Steel  1.Advantages & Disadvantages 2.Properties-Material-Mechanical3.Steel Section-Hot Rolled-Cold form-Built-up4. Section Properties5.Structural Design6.Limit State Design  9/30/20142 ã YieldStrength(fy)=220–540Mpa ã UltimateTensileStrength=1.2fy ã ModulusElasticity(E)=2x10 6 N/mm2 ã ShearModulus(G)=0.4E ã PoissonRatio( ν) -ElasticRange=0.3-PlasticRange=0.5 ã coefficientoflinearthermalexpansion Mechanical Properties of Structural Steel  1.Advantages & Disadvantages 2.Properties-Material-Mechanical3.Steel Section-Hot Rolled-Cold form-Built-up4. Section Properties5.Structural Design6.Limit State Design Stress Strain Curve for Structural Steel  1.Advantages & Disadvantages 2.Properties-Material-Mechanical3.Steel Section-Hot Rolled-Cold form-Built-up4. Section Properties5.Structural Design6.Limit State Design Yield Strength & Ultimate Tensile Strength  1.Advantages & Disadvantages 2.Properties-Material-Mechanical3.Steel Section-Hot Rolled-Cold form-Built-up4. Section Properties5.Structural Design6.Limit State Design Steel section  1. Hot rolled Sections -heated up and pushed through rollers that squeeze the metal into a particular profile, depending on the shape of the rollers. 1.Advantages & Disadvantages 2.Properties-Material-Mechanical3.Steel Section-Hot Rolled-Cold form-Built-up4. Section Properties5.Structural Design6.Limit State Design  9/30/20143 Steel section  2. Cold formed section -are created by the working of sheet steel using stamping, rolling, or presses to deform the sheet into a profile 1.Advantages & Disadvantages 2.Properties-Material-Mechanical3.Steel Section-Hot Rolled-Cold form-Built-up4. Section Properties5.Structural Design6.Limit State Design Steel section  3. Built-up  –form a shape by welding together different hot-rolled sections 1.Advantages & Disadvantages 2.Properties-Material-Mechanical3.Steel Section-Hot Rolled-Cold form-Built-up4. Section Properties5.Structural Design6.Limit State Design Section Properties  ã Labelling bh dt w t f  ry yzztbrh y yzz 1.Advantages & Disadvantages 2.Properties-Material-Mechanical3.Steel Section-Hot Rolled-Cold form-Built-up4. Section Properties5.Structural Design6.Limit State Design Section Properties  ã Typical section properties for design resistance calculation  AAreaW el Elastic modulusW pl Plastic modulusI y Second moment of area –major axisI z Second moment of area –minor axisiRadius of gyration 1.Advantages & Disadvantages 2.Properties-Material-Mechanical3.Steel Section-Hot Rolled-Cold form-Built-up4. Section Properties5.Structural Design6.Limit State Design  9/30/20144 Structural Design  ã Principle design requirements:a) Structural requirements: ã  Safety  –produce a structure which will not fail in its design lifetime, or has an acceptably low risk of failure ã  Stiffness of the structure  –sufficient to ensure that the serviceability of the structure is not impaired by excessive deflections, vibrations and the like.b) Other requirements: ã  Economy  –the type and quantity of materials, methods of fabricating and constructions, sizes of the members of the structure. ã  Harmony  –relationships between the different systems of the structure i.e. the structural system (load resistance and transfer system), the architectural system, the electrical and mechanical system and environment. 1.Advantages & Disadvantages 2.Properties-Material-Mechanical3.Steel Section-Hot Rolled-Cold form-Built-up4. Section Properties5.Structural Design6.Limit State Design Overall Design Process  1.Advantages & Disadvantages 2.Properties-Material-Mechanical3.Steel Section-Hot Rolled-Cold form-Built-up4. Section Properties5.Structural Design6.Limit State Design Structural Design Process  1.Advantages & Disadvantages 2.Properties-Material-Mechanical3.Steel Section-Hot Rolled-Cold form-Built-up4. Section Properties5.Structural Design6.Limit State Design Structural Design Process  ã Design procedure for structural framework design:a) Planning –establish the functions of the structureb) Preliminary structural configuration –arrangement of the elementsc) Establishment of the loadsd) Preliminary member selectione) Analysisf) Evaluation –all of the above requirements are satisfied and compare with predetermined criteriag) Redesign –repetition of the sequences are needed based on the evaluationh) Final decision –whether optimum design has been achieved 1.Advantages & Disadvantages 2.Properties-Material-Mechanical3.Steel Section-Hot Rolled-Cold form-Built-up4. Section Properties5.Structural Design6.Limit State Design
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