Default is 50 psf which you can change. Table B3 from DCA 6 – 2012. Calculating Tributary Area. The method does, however, have it's limitations.

The total load for each tributary area is then divided by the area of each footing in order to determine the load psf imposed on the soil. The tributary area supported by a post is half the length of the beam on either side of the post multiplied by half the joist length to the next support, such as the ledger on the house or another beam, plus the entire distance the joists cantilever past the beam. RE: Tributary Area Calculations and Live Load Reductions BAretired (Structural) 26 Apr 15 02:23 If you are designing the column for a Live Load of 1.25wL 2 , you should be entitled to a live load reduction factor based on the area 1.25L 2 . Calculating Tributary Area. But, is there any option in Staad where I can check the load carried by each beam after applying floor load.

Such a grid of beams decreases the duration of the slab and as a result empowers the designer to … Calculating Tributary Area Most professional deck designers and deck design software programs select the post size based on tributary area calculations. Section TA.2. Depending on how close the combined stress index (CSI) values are to 1.0 on the original truss design, increasing the on center spacing to reflect the new tributary area could result in overstressed lumber and plate failures. When the tributary area is used, the position of floor beams is not taken into consideration, but an allowance for their weight is included. International Journal of Civil and Structural Engineering. It is the area contributing to the load reaction on the respective beam or column. (Load Calculations) Page 5 of 6 3. If not, the load is greatest at the center of the beam, where the tributary area is widest. After the application of floor load the tributary area of each beam is visible. Abdulwahid, Comparison of calculation of axial loads on columns by tributary area method and 3D modeling by SAP2000.

Haque, P.E.

If the tributary area can be identified, then it is not often necessary to compute the progression of load transfer through the load path.

d) For the structure shown below with three interior beams, find the tributary area (larger than part , but c less than a) and live load reduction factor for the bottommost girder (some helpful equations are provided). The tributary area supported by a post is half the length of the beam on either side of the post multiplied by half the joist length to the next support, such as the ledger on the house or another beam, plus the entire distance the joists cantilever past the beam. The consideration at this point is to determine whether a system is one-way or two-way, allowing the tributary width and load distribution to be assigned to the member. It then determines the total load from each tributary area based on the design load of your deck.

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