So a 100 sqft deck would be designed to support 5000 lbs.
Tributary roof load.
This means that one is a fixed node and the other is a rolling node.
Tributary loading or tributary widthis the accumulation of loads that are directed toward a particular structural member.
It can also be called the load periphery.
The tributary areais a loaded area that contributes to the load on the member supporting that area ex.
This concept typically considers the tributary area that a member must support as being halfway between the adjacent similar members.
A fixed node will provide support in both directions down the length of the roof truss members often called the x and y directions.
D dead load l live load l r live roof load w wind load s snow load e earthquake load r rainwater load or ice water load.
It goes without saying that in a warmer climate the snow load probably would be less so you need to check your code book for live loads and dead loads in your region.
The tributary area times the pressure on the surface.
Don t get confused with what weight you might think or want to load the deck with.
11 04 2014 if the beam is supporting a floor roof or wall that has a pressure loading normal to the surface the total force on the beam equals the area of surface supported i e.
Our sample homes are in an area where the snow load is 50 pounds per square foot of roof area treat snow as live load.
Tributary areas for gravity loads.
The area from the center between two beams to the center of the next two beams for the full span is the load on the center beam.
D dead load l live load l r roof live load w wind load e earthquake load s snow load r rain load f flood load t temperature or self strain load h hydrostatic pressure load design of a member or of a segment of a member must be based on the load case that produces the largest force stress displacement value.
Tributary area loads uniformly distributed over an area of roof or floor are assigned to individual members rafters joists beams girders based on the concept of tributary area.
Now let s find the tributary areas of a deck to determine the maximum load capacity of your deck start by calculating its total area and multiply by 50 psf.
If the load is 100 psf the load to the beam would be 12 ft x 100 psf 1200 plf.
The left wall has 7 ft of tributary width and would receive a load of 700 plf.
Used but they typically defined the load cases or combination stress or strength limits and deflection limits.
