Internal Forces - Architectural Structures - Lecture Slides, Slides of Structural Design and Architecture

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Internal Beam Forces 1 Lecture 7

ARCHITECTURAL STRUCTURES: FORM, BEHAVIOR, AND DESIGN

seven

beams –

internal forces

lecture

http:// nisee.berkeley.edu/godden

Internal Beam Forces 2Lecture 7 Architectural Structures

Beams

• span horizontally
  • floors
  • bridges
  • roofs
• loaded transversely by gravity loads
• may have internal axial force
• will have internal shear force
• will have internal moment (bending)

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Internal Beam Forces 4 Lecture 7

Beams

• bending
  • bowing of beam with loads
  • one edge surface stretches
  • other edge surface squishes

Internal Beam Forces 5Lecture 7

Beam Stresses

• stress = relative force over an area
  • tensile
  • compressive
  • bending
    • tension and compression + ...

Internal Beam Forces 7Lecture 7

Beam Stresses

• tension and compression
  • causes moments

Copyright © 1996-2000 Kirk Martini.

Internal Beam Forces 8Lecture 7

Beam Stresses

• prestress or post-tensioning
  • put stresses in tension area to “pre-compress”

Internal Beam Forces 10Lecture 7

Beam Stresses

• shear – horizontal & vertical

Internal Beam Forces 11Lecture 7

Beam Stresses

• shear – horizontal

Internal Beam Forces 13Lecture 7

Beam Deflections

• “moment of inertia”

Internal Beam Forces 14Lecture 7

Beam Styles

• vierendeel
• open web joists
• manufactured

http:// nisee.berkeley.edu/godden

Internal Beam Forces 16Lecture 7

Beam Loading

• concentrated force
• concentrated moment
  • spandrel beams

Internal Beam Forces 17Lecture 7

Beam Loading

• uniformly distributed load (line load)
• non-uniformly distributed load
  • hydrostatic pressure =  h
  • wind loads

Internal Beam Forces 19 Lecture 7

Beam Supports

• in the real world, modeled type

Internal Beam Forces 20Lecture 7

Internal Forces in Beams

• like method of sections / joints
  • no axial forces
• section must be in equilibrium
• want to know where biggest internal forces and moments are for designing

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