BC CH 1-3

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Author:
eaglejay
ID:
111363
Filename:
BC CH 1-3
Updated:
2011-10-23 11:24:59
Tags:
Building Construction
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Description:
Building Construction
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  1. What are the 5 types of building construction?
    • 1. Fire resistive
    • 2. Noncombustible
    • 3. Masonry-ordinary
    • 4. Heavy Timber
    • 5 Wood Frame
  2. Most important part of a buildings design in regards to exposure fires?
    Height and width of the building
  3. What are the potential sources of failure of a building during a fire?
    • Structural integrity
    • building systems
    • design definciency
  4. Accessability-Manual fire alarm stations must not be more than___ft and not less than ___ft above the floor level so they may be reached from a wheelchair
    • not higher than 4 1/2ft
    • not less than 3 1/2ft
  5. What is the fire resistance rating requirement of columns supporting floors in a type 1 building?
    3 hrs
  6. What is the FRR of walls enclosing exit stairwells?
    1 or 2 hr rating
  7. Type 1 construction FRR for
    1. Bearing walls, columns, and beams?
    2. Floor construction?
    3. Roof Deck?
    • 1.) 2 to 4 hrs
    • 2.) 2 to 3 hrs
    • 3.) 1 to 2 hrs * some codes omit roof standard when it is located above 20ft from the floor
  8. Two most common methods of type 1 construction?
    • re-inforced concrete
    • protected steel frame
  9. Type 2 construction details
    • Noncombustibles
    • may be protected or unprotected
    • unprotected steel most commonly used
  10. Type III construction
    • Type IIIA= 1hr FRR for interior members
    • Type IIIB= has 0 fire resistive rating for interior members
    • wood= not uncommon to have 2X10 inch joists for floors
    • Fundamental concern is concealed space combustibility
  11. Type IV Heavy Timber details
    • typically masonry exterior
    • beams,columns, floors and roofs made of solid or laminated wood with dimensions greater than type III
    • Floors can be 6X10
  12. Type V contruction has 2 types?
    Many have what FRR?
    • Balloon frame and Platform frame
    • 1HR FRR typiccally accompplished with two pieces of gypsum board 1 on each side
  13. Wind exerts the following 3 basic forces, describe?
    • Direct pressure-the impact effect of wind on a surface. force may be reduced by streamlining the surface
    • Aerodynamic drag- when wind encounters an object its fluid nature causes it to flow around an object. This exerts drag on an object.
    • Negative pressure- a suction effect produced on the down wind side resulting in outward pressure
  14. What are winds 3 secondary effects?
    • Rocking effects- due to velocity variations
    • Vibrations- wind passing over a surface may cause vibration depending on the velocity
    • Clean off effect- tendency of wind to dislodge objects from a building
  15. 2 pressure effects of soil on building?
    • Active soil pressure- soil vs. foundation
    • Passive soil pressure- foundation vs. soil
  16. Describe dead loads and live loads?
    • Dead loads- weight of structural components, usually any permanent attached feature
    • Live loads- not fixed or permanent; usually applied to occupants, contents and the wight of snow, rain on roof
  17. Snow loads maybe as much as___lbs per sq. foot?
    60lbs
  18. Describe Static and Dynamic loads?
    • Static loads- are loads that are steady or applied gradually
    • Dynamic loads- loads that involve motion
  19. Describe the interior forces or stress? (3)
    • Tension- pulls materials apart
    • Compression- squeezes materials
    • Shear- slide one plane of a material past an adjacent plane
  20. Exterior loads are classified according to the manner applied, what are they? (3)
    • Axial load-applied to center of cross section of a structural member and perpendicular to that cross section
    • Eccentric load- Perpendicular to cross section does not pass through cross section
    • Torsional load- offset from the center of the cross section of the structural member and at an angle to or in same plane as cross section
  21. Define beams
    • carry load perpendicular to its longitudal dimensions
    • * tall beams are capable of supporting greater loads than shorter beams
  22. Define Columns
    • members designed to support axial compression
    • tall and thin=buckle failure
    • squatty= crush failure
  23. 3 basic structural systems?
    • structural bearing walls- support spanning elements such as beams, trusses, and precast concrete slabs aka bearing walls
    • Post and Beam construction- typically 6X8; when supporting roof spacing 24 inches apart unlike studs 12 to 16inches apart
    • Slab + column- most frequently in concrete structures

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