Tributary area is the space or area that a beam or column is responsible for carrying on a floor. When the tributary area is used, the position of floor beams is not taken into consideration, but an allowance for their weight is included. (Load Calculations) Page 5 of 6 3. 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. If the tributary area can be identified, then it is not often necessary to compute the progression of load transfer through the load path. Abdulwahid, Comparison of calculation of axial loads on columns by tributary area method and 3D modeling by SAP2000. If not, the load is greatest at the center of the beam, where the tributary area is widest. This feature is not available right now. 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 . Section TA.2. Calculating Tributary Area. For columns, it is assumed that tributary areas are the same for all floors. Default is 50 psf which you can change. Column A4 Tributary area, A T = 20 x 15 = 300 sq ft Corner column without cantilever slab, Influence area, A 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. Please try again later. The two principle conditions for using tributary area as a means for determining element loading are: The load on the tributary area must be a constant pressure. This calculator determines the size of each tributary area of your deck. Several floor systems comprise a reinforced concrete slab that is based on a rectangular grid of beams.

Table B3 from DCA 6 – 2012. Doing so automatically adjusts the tributary area for the typical beam.


I'm not clear on whether interconnected joists like these will do that or not. Such a grid of beams decreases the duration of the slab and as a result empowers the designer to … It then determines the total load from each tributary area based on the design load of your deck. Re: Tributary areas Laurie Comerford wrote: > Hi Jon, > > If you design the sewer profile as a road profile, you can attach a simple > template to model the vertical steps needed in the sewer connections, and > then create cut batters as 1% (or whatever the allowed pipe slope is). If you know the limit of acceptable deflection and how much weight a beam needs to carry—both of which are provided by building codes—then the type, species, grade, length, width, and depth of the beam all can be selected - Fine Homebuilding Instead of carrying 2 ft of tributary area as designed, the adjacent truss now carries 2’ 1-1/2” of tributary area. Haque, P.E. 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 areas for triangle-patterned joists Yes, if the load is being evenly distributed by the lattice-like joists, that would give the answer shown above. Calculating Tributary Area. But, is there any option in Staad where I can check the load carried by each beam after applying floor load. 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. The method does, however, have it's limitations. Dr. M.E. Tributary width is the width of an area divided according to the area load type.
Last Revised: 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. Tributary load denotes the load pursuing on a member (required to design it). Tributary Areas for Gravity Loads.


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