Rigid Frames: Properties, Analysis, and Design, Slides of Structural Design and Architecture

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Rigid Frames 1Lecture 27 A RCHITECTURAL S TRUCTURES I: S TATICS AND

S

TRENGTH OF

M

ATERIALS lecture

twenty seven frames:rigid and braced

Rigid Frames 2Lecture 27 A

Rigid Frames •

rigid frames have nopins

frame is all one body - joints transfermoments and shear - typically staticallyindeterminate - types - portal - gable

Rigid Frames Rigid Frames 4Lecture 27

moments get redistributed

deflections are smaller - effective column lengths are shorter - very sensitive to settling

Rigid Frames • Rigid Frames 5Lecture 27

resists lateralloadings

shape depends onstiffness of beamsand columns - 90° maintained

Rigid Frames • Rigid Frames 7Lecture 27

connections

steel

concrete

Braced Frames • Rigid Frames 8Lecture 27

pin connections

bracing to prevent lateral movements

Shear Walls • Rigid Frames 10Lecture 27

resist lateral load in plane with wall

Rigid Frame Analysis • Rigid Frames 11Lecture 27

members see

shear

axial force - bending

V & M diagrams

plot on “outside”

Rigid Frame Analysis Rigid Frames 13Lecture 27

FBD & M

opposite endreactions at joints M+ P

Rigid Frames 14Lecture 27 A

Rigid Frame Design •

loads and combinations

usually uniformly distributed gravity loads

worst case for largest moments... - wind direction can increase moments

Rigid Frames 16Lecture 27 A

Rigid Frame Design •

floors – plates & slabs

one-way behavior

side ratio > 1. - “strip” beam - two-way behavior - more complex