Tributary Roof 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.

Tributary roof load. Don t get confused with what weight you might think or want to load the deck with. This means that one is a fixed node and the other is a rolling node. 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 can also be called the load periphery.

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. The tributary area times the pressure on the surface. Tributary loading or tributary widthis the accumulation of loads that are directed toward a particular structural member. 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.

Tributary areas for gravity loads. So a 100 sqft deck would be designed to support 5000 lbs. A fixed node will provide support in both directions down the length of the roof truss members often called the x and y directions. The tributary areais a loaded area that contributes to the load on the member supporting that area ex.

In order for a roof truss load to be stable you need to assign two of your nodes on each truss to be support nodes. 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. 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. Used but they typically defined the load cases or combination stress or strength limits and deflection limits.

If the load is 100 psf the load to the beam would be 12 ft x 100 psf 1200 plf. This concept typically considers the tributary area that a member must support as being halfway between the adjacent similar members. Tributary width is 7 ft 5 ft 12 ft. The left wall has 7 ft of tributary width and would receive a load of 700 plf.