lect20 - ARCHITECTURAL STRUCTURES III: STRUCTURAL ANALYSIS...

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Steel Construction 1 Lecture 20 Architectural Structures III ARCH 631 F2005abn twenty steel construction and design lecture A RCHITECTURAL S TRUCTURES III : S TRUCTURAL A NALYSIS AND S YSTEMS ARCH 631 D R. A NNE N ICHOLS F ALL 2005
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Steel Construction 2 Lecture 20 Architectural Structures III ARCH 631 F2005abn Steel cast iron – wrought iron - steel cables columns beams trusses frames
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Steel Construction 3 Lecture 20 Architectural Structures III ARCH 631 F2005abn Steel Construction standard rolled shapes open web joists plate girders decking
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Steel Construction 4 Lecture 20 Architectural Structures III ARCH 631 F2005abn Steel Construction welding bolts
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Steel Construction 5 Lecture 20 Architectural Structures III ARCH 631 F2005abn Steel Construction fire proofing cementicious spray encasement in gypsum intumescent – expands with heat sprinkler system
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Steel Construction 6 Lecture 20 Architectural Structures III ARCH 631 F2005abn Steel Materials high strength to weight ratio ductile beam size often limited by deflection column size limited by slenderness
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Steel Construction 7 Lecture 20 Architectural Structures III ARCH 631 F2005abn Steel Beams types manufactured shapes castellated
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Steel Construction 8 Lecture 20 Architectural Structures III ARCH 631 F2005abn Steel Beams types wide flange
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Steel Construction 9 Lecture 20 Architectural Structures III ARCH 631 F2005abn Steel Beams types open web joists (manufactured trusses)
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Steel Construction 10 Lecture 20 Architectural Structures III ARCH 631 F2005abn Steel Beams types (more) plate girder decking
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Steel Construction 11 Lecture 20 Architectural Structures III ARCH 631 F2005abn Steel Beams
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Steel Construction 12 Lecture 20 Architectural Structures III ARCH 631 F2005abn Steel Beams lateral stability - bracing local buckling - stiffen
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Steel Construction 13 Lecture 20 Architectural Structures III ARCH 631 F2005abn Local Buckling steel I beams flange buckle in direction of smaller radius of gyration web force “crippling”
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Steel Construction 14 Lecture 20 Architectural Structures III ARCH 631 F2005abn Local Buckling flange web
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Steel Construction 15 Lecture 20 Architectural Structures III ARCH 631 F2005abn Shear in Web panels in plate girders or webs with large shear buckling in compression direction add stiffeners
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Steel Construction 16 Lecture 20 Architectural Structures III ARCH 631 F2005abn Steel Beams end conditions a) away from connection - full section effective b) high shear – only web effective
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Steel Construction 17 Lecture 20 Architectural Structures III ARCH 631 F2005abn Steel Beams end conditions c) bolt holes – less material d) local web buckling
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Steel Construction 18 Lecture 20 Architectural Structures III ARCH 631 F2005abn Steel Beams bearing provide adequate area prevent local yield of flange and web
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lect20 - ARCHITECTURAL STRUCTURES III: STRUCTURAL ANALYSIS...

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