This calculator determines the size of each tributary area of your deck. It then determines the total load from each tributary area based on the design load of your deck. Default is 50 psf which you can change.
If the deck was 200 sqft and 40 psf live load, the total live load would be 9600 lbs and the three columns would be required to support 9600/2 or 4800 lbs of live load in practice you would also include the dead load which is the weight of the materials.
For decks and the first floors of houses, residential code is based on a vertical live loading people and furniture of 40 pounds per square foot psf plus a 10-psf dead load the weight of the structure itself , for a total design load of 50 psf.
Each member, that is a part of that deck has a load capacity. The load capacities are mainly determined by the area of the section modulus. For example, a 6x6 post has an area of 5 1/2"x 5 1/2" which equals 30 1/4" sq.in. Based on the species of wood and the 30 1/4 sq.in., the load capacity can be found for a 6x6.
www.nwbuildnet.com/articles/deck loads.html If you have an existing deck, I would call a Proffessional Engineer PE to calculate it's load capacity.
Because the calculator goes beyond the limits of grade, live load, and dead load in the DCA 6 and IRC tables, you can design decks that fall outside the table limits. For instance, if you know the dead load of the deck will be less than the prescriptive 10 lb., then you can select 5 lb. or 7 lb. and eek out a longer span.
Design Load = 40 LL 10 DL, Deflections=L/360 Sample Calculations for Using Joist Span and Beam Size CASE I SOLUTION: Refer to tables for joist and beam size requirements. With a 12 deck span, the beam may be either two 2x8s or two 2x10s, depending on wood used.
Use this deck beam and footing calculator to determine what size beam you need based on your support post spacing and joist size.Also find the result of the proper concrete footing diameter based on the soil type and tributary deck area.
To increase the use of wood by assuring the broad regulatory acceptance of wood products, developing design tools and guidelines for wood construction, and influencing the development of public policies affecting the use and manufacture of wood products.
Joist Span Calculator Species Southern Pine Douglas Fir-Larch, Hem Fir, Spruce-Pine-Fir Redwood, Western Cedars, Ponderosa Pine, Red Pine Joist Size 2 x 6 2 x 8 2 x 10 2 x 12
Conservatively include live loads in Effective Seismic Weight Deck and Porch Lateral Loading by Occupants, Donald A. Bender, 2013
The deck support columns, transferred from the beam, will have to carry the balance of the load; 4,800 total load of deck 2,100 load carried by ledger = 2,700 pounds. We also determined that the maximum load we want to carry on any one deck support column is 1,250 pounds. The calculation of 2,700 ÷ 1,250 comes out at 2.2.
Decks, Patios, Porches, Walkways, Driveways, Stairs, Steps and Docks - Load calculator - Does anyone know of a tool that can help me calculate load for a deck design? I searched google pretty hard