carpentry 1- floor frame support systems
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what is a column?
a vertical length of wood, metal, or suitable material that transfers load to a support below
how should columns be installed?
all columns must be centrally located on footings and securely fastened to the supported member and footing to prevent lateral movement
what size of steel plate would need to be on top of a steel column supporting a wood beam?
must extend across the full width of the beam and 100mm wide, 6.35mm thick
what is the benefit of a telepost over a non-adjustable column?
as a home settles the wood members shrink, the telepost can be adjusted to accomedate the movement
why and how must the base of a wood column be protected when in contact with a footing?
a concrete pedestal cap can be installed. columns must be seperated from concrete by polyethylene film or type s roll roofing
can a built-up wood column be constructed of short pieces from the job site?
no the layers must be full length and not less than 1 1/2" thickness
can a carpenter glue some plywood together and make an engineered column?
no. a structural engineer determines the size of the column required to support the anticipated loads and the manufacturer assembles it.
if you are not going to finish a loadbearing wall, what must be done?
the studs are tall and narrow and subject to bending or buckling. if left unfinished blocking or strapping should be fastened to the studs at mid height.
what is a pony wall?
its a short load bearing wood wall framed above the concrete foundation wall
list 2 possible benefits of a pony wall over a full concrete foundation.
- 1. insulation and window frames are easier
- 2. exterior/interior finishing is easier to atttach
how do you determine the size of a beam pocket?
should be constructed to provide even and level support and sufficient size to provide no less than 89mm of end bearing. the height is determined by the position of the floor joists
which direction do beams typically run relative to the foundation:length or width, and why?
usually the length because it will reduce cost by having shorter joists
why must you restrain the top flange of a steel beam, regardless of where the joist is supported on the beam?
because it needs to be laterally supported to prevent it from twisting which would cause it to fail.
what factors determine the size of steel beam required?
the number of columns, placement of columns and spans of joist determines size and strength of beam
what does the W310 mean in a beam size W310×39 ?
W is wide flange beam, 310 is the height so 310mm, and 39 is weight supported per lineaer meter
describe how to determine supported joist length in metres.
supported joist length is half the spans of the joist on both sides of the beam
what does maximum span represent in the national building code?
represents the maximum column spacing allowed by code when matched with specific joist length and beam section
what determines the size and number of layers required to construct a wood beam?
the number of columns supporting the beam and length of joists
what 4 factors should you consider before designing a floor frame support system?
- 1. size of joist material wanted
- 2. size of beam you want
- 3. wether columns must be in specific locations
- 4. specific number of columns
why are you not allowed to cut or place a butt joint in a single span beam?
any butt joint is a weak point and a single span would not be able to support its weight
what factors should you consider when planning the construction of a built-up wood beam?
where can butt joints occur, what length of materials are available, how many plys will it have
which is stronger when used to span the same distance: 3 separate built- up wood beams or one continuous built-up wood beam?
several individual built-up wood beams laid end to end are not as strong as one continuous beam
why can butt joints be made in a built-up wood beam at the quarter points?
because the cantilever effect causes compresive and tensile forces to cancel each other out causing a neutral zone
do floor systems have to be anchored to the foundation?
yes they must be anchored unless proven unnecessary
list 2 most common methods of anchoring the floor joists to the foundation.
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