Building 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
    Image Upload 1
  5. Dynamic and lateral loads, applied suddenly
    Wind, seismic, impact loads
  6. Beams, loads are typically limited by bending stress and deflection
    Image Upload 2
  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
    • Image Upload 3
  11. Compressive stresses
    • "pushing" force acting through the axis of the structure
    • include: columns and bearing wallsImage Upload 4
  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
Author
ID
105064
Card Set
Building Systems
Description
Structural Systems
Updated
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