Area 0 5 sqrt l 1 2 l 2 2 w c.
Floor load width diagram.
Supporting load bearing walls and lintels in lower storey load bearing walls.
Beam uniform load floor loading psf x tributary width ft beam b 3 6 8 tributary width.
Maximum floor joist span for no.
Beam b 3 6 8 tributary width tributary area 18 ft 6 67 ft 120 ft2 tributary area beam span length x tributary width.
Refer to figure 3 4 4 1 table a of the building code of australia.
Figure ta 2 14 load diagram for girder bc.
Roof load width rlw and floor load width flw can be determined from as1684 or from the images below.
First floor live loads have higher requirements than second floor live loads 40 pounds per square foot vs.
Where the bearer supports load bearing walls the type of roof covering also needs to be determined.
2 grade of douglas fir are indicated below.
In order to use the table select the floor load width from among the top line of the table in this case 1200mm 1800mm etc our example is 2m 2000mm and use the corresponding column 2400mm below to select the appropriate size of bearer from the list on the left and the post spacing measurement to match from within the column.
This is referred to as the floor load width flw.
These diagrams may also be used to determine roof load width for floor joists.
But a single span of 3800 with a flw of 2400 and joist spacings at 450 no roof loads you could get away with 1 x 240x45 f27 kiln dried hardwood.
Depending on the floor live load you will need 2 x 240x45.
This video looks at floor load width flw.
Alternately you can find w c by recognizing that the load on the girder has a triangular distribution and then set up the expression that equates the tributary load to the shape of the load diagram.
This results in the load diagram given in figure ta 2 14.
8th sep 2011 03 37 pm.
The bearer span non loadbearing single or continuous is determined from the floor load width flw which for an external bearer will be half the joist span.
Calculating beam loading assume that the floor system must support.
This is the fourth video in the series on the timber framing code.
A room used solely for sleeping might need to carry only 30 psf whereas a garage floor over a basement would need 50 psf or higher.
For an internal bearer which i assume you aren t after it is the half span load in both directions.
To calculate your bearer size accurately flw needs to be taken into account as well as the live load of thr floor.
Determination of roof load width.
An inaccessible attic space on the other hand might have a live load of only 20 psf.
1 psf lb f ft 2 47 88 n m 2.
Tile roofs impart a heavier dead load on the bearers than sheet roofs.
1 ft 0 3048 m.
