Building Systems

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Author:
janelle596
ID:
105064
Filename:
Building Systems
Updated:
2011-09-28 21:55:21
Tags:
Building Systems
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Description:
Structural Systems
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  1. What is LOAD
    force acting on structure
  2. Force =
    mass x acceleration: Newtown's Second Law of Motion
  3. Static/Gravity loads, applied slowly
    • 1. Live loads (people, furniture, movable equipment, snow)
    • 2. Dead loads (building structure, immovable equipment)
  4. Types of Load
  5. Dynamic and lateral loads, applied suddenly
    Wind, seismic, impact loads
  6. Beams, loads are typically limited by bending stress and deflection
  7. What is STRESS
    load or force per unit area
  8. External Stresses
    • Tire pressure, p.s.i (pounds per square inch)
    • Residential floor systems are required to support 40 p.s.f. (pounds per square foot)
  9. Internal Stresses
    Tensile, Compressive, Shear, Bending Stress
  10. Tensile Stresses
    • "pulling" force acting through the axis of the structure.
    • include: chain, cable, rod and rope
  11. Compressive stresses
    • "pushing" force acting through the axis of the structure
    • include: columns and bearing walls
  12. Shearing stresses
    • "slipping" force acting through the structure
    • Vertical shear occurs perpendicular to the major axis of the structure (scissors work by applying shear perpendicular to the paper surface)
    • Horizontal shear occurs parallel to the major axis of the structure (loading a beam introduces horizontal shear)
  13. Bending Stresses
    • Coupled "pulling" and "pushing" forces acting parallel the axis of the structure.
    • Gravity loads on a simply supported beam causes tensile stresses in the bottom of the beam and compressive stresses at the top of the beam
    • Maximum allowable loads are typically limited by bending stress

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