BC CH 1-3
Card Set Information
BC CH 1-3
What are the 5 types of building construction?
1. Fire resistive
4. Heavy Timber
5 Wood Frame
Most important part of a buildings design in regards to exposure fires?
Height and width of the building
What are the potential sources of failure of a building during a fire?
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
What is the fire resistance rating requirement of columns supporting floors in a type 1 building?
What is the FRR of walls enclosing exit stairwells?
1 or 2 hr rating
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
Two most common methods of type 1 construction?
protected steel frame
Type 2 construction details
may be protected or unprotected
unprotected steel most commonly used
Type III construction
Type IIIA= 1hr FRR for interior members
Type IIIB= has
fire resistive rating for interior members
wood= not uncommon to have 2X10 inch joists for floors
Fundamental concern is concealed space combustibility
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
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
Wind exerts the following 3 basic forces, describe?
-the impact effect of wind on a surface. force may be reduced by streamlining the surface
- when wind encounters an object its fluid nature causes it to flow around an object. This exerts drag on an object.
- a suction effect produced on the down wind side resulting in outward pressure
What are winds 3 secondary effects?
- due to velocity variations
- wind passing over a surface may cause vibration depending on the velocity
Clean off effect
- tendency of wind to dislodge objects from a building
2 pressure effects of soil on building?
Active soil pressure
- soil vs. foundation
Passive soil pressure
- foundation vs. soil
Describe dead loads and live loads?
- weight of structural components, usually any permanent attached feature
- not fixed or permanent; usually applied to occupants, contents and the wight of snow, rain on roof
Snow loads maybe as much as___lbs per sq. foot?
Describe Static and Dynamic loads?
- are loads that are steady or applied gradually
- loads that involve motion
Describe the interior forces or stress? (3)
- pulls materials apart
- squeezes materials
- slide one plane of a material past an adjacent plane
Exterior loads are classified according to the manner applied, what are they? (3)
-applied to center of cross section of a structural member and perpendicular to that cross section
- Perpendicular to cross section does not pass through cross section
- offset from the center of the cross section of the structural member and at an angle to or in same plane as cross section
carry load perpendicular to its longitudal dimensions
* tall beams are capable of supporting greater loads than shorter beams
members designed to support axial compression
tall and thin=buckle failure
squatty= crush failure
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