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Rigid Frames 1Lecture 27 Architectural Structures I ENDS 231 S2008abn A RCHITECTURAL S TRUCTURES I: S TATICS AND
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TRENGTH OF
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ATERIALS ENDS 231D R.
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NNE
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ICHOLS S PRING 2008 lecture
twenty seven frames:rigid and braced
Rigid Frames 8Lecture 27 Architectural Structures I ENDS 231 S2004abn
Rigid Frames •^
rigid frames have nopins
-^ frame is all one body -^ joints transfermoments and shear -^ typically staticallyindeterminate -^ types^ – portal - gable Rigid Frames 9Lecture 27 Architectural Structures I ENDS 231 S2004abn
Rigid Frames •^
behavior Rigid Frames 10Lecture 27 Architectural Structures I ENDS 231 S2004abn
Rigid Frames
moments get redistributed
deflections are smaller - effective column lengths are shorter - very sensitive to settling
Rigid Frames 11Lecture 27 Architectural Structures I ENDS 231 S2004abn
Rigid Frames •^
resists lateralloadings
-^ shape depends onstiffness of beamsand columns -^ 90° maintained Rigid Frames 12Lecture 27 Architectural Structures I ENDS 231 S2004abn
Rigid Frames •
staggered truss^ –
rigidity
clear stories Rigid Frames 13Lecture 27 Architectural Structures I ENDS 231 S2004abn
Rigid Frames •^
connections^ –
steel
concrete Rigid Frames 14Lecture 27 Architectural Structures I ENDS 231 S2004abn
Braced Frames •
pin connections
bracing to prevent lateral movements
Rigid Frames 19Lecture 27 Architectural Structures I ENDS 231 S2004abn
Rigid Frame Analysis
FBD & M
-^ opposite endreactions at joints M+ P Rigid Frames 20Lecture 27 Architectural Structures I ENDS 231 S2005abn
Rigid Frame Design •
loads and combinations^ –
usually uniformly distributed gravity loads
worst case for largest moments... - wind direction can increase moments Rigid Frames 21Lecture 27 Architectural Structures I ENDS 231 S2005abn
Rigid Frame Design •^
frames & floors^ –
rigid frame can have slab floors or slabwith connecting beams
-^
other^ –
slabs or plateson columns Rigid Frames 22Lecture 27 Architectural Structures I ENDS 231 S2005abn
Rigid Frame Design •
floors – plates & slabs^ –
one-way behavior
-^ side ratio > 1. -^ “strip” beam - two-way behavior -^ more complex
