The Tributary area method is the approximation method and also it is an accurate method. Tributary Area Method - The area of slab above supported by the wall. Tributary area, A T = 20 x 15 = 300 sq ft Corner column without cantilever slab, Influence area, A I = 1 A T = 1x 300 = 300 sq ft < 400, No live load reduction permitted. In your case, the residential building has the "main load bearing" walls. Most of the time, we prepare a computer model for structural analysis. where Sp is expressed in psi and MPa and pillar dimensions are in ft and m in English and SI units respectively. This method is based on a force balance between the load carried by the pillar and the tributary area conveying load to the pillar. Find both the reduced and unreduced peak shear and moment due to the live load. Hw 2 P3 1 14 25 For The Floor Framing. live load (snow): 50 psf x 12 ft = 600 pounds per lineal foot. Tributary area method is the simplest method of determining the pillar load. strengths formulas in Table 1, which were determined using either the tributary area method, or two and three dimensional elastic analyses, represent either the average maximum pillar stress or the maximum stress at the center of the pillar. The beam receives an equal load for each foot of length. Solved Problem 1 Tributary Area Hnd R The Forisijected T. Structural Ysis. Salamon-Munro Formula (1967) Salamon- Based on the 125 case histories in South African coal fields. Example: Beam ‘A’ has 2 sq ft of contributing load on each side (a tributary load). Creating Load Calculations For Each Beam In Dynamo Revit. C.) PLF Pounds per lineal foot is used to describe loads on walls or long members such as beams. Chapter 2 - Stormwater Section 2B-4 - Runoff and Peak Flow ... A portion of a drainage area that has a value of C much higher than the rest of the area Load Calculation For Each Tributary Area A= 40sqft x 50psf or 2000 lbs B= 19.5sqft x 50 psf or 975 lbs C= 21 sqft x 50 psf or 1050 lbs D= 19.5sqft x 50 psf or 975 lbs Notice that the middle tributary zone must carry more weight than the adjacent areas B and D. 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). Ridge Beam Conditions. To total the load on an area, multiply the Area times the PSF. RE: Tributary Area method r13 (Civil/Environmental) 12 Apr 20 21:07 I assume the drawing shown is the first floor plan, that shows wall discontinuous at (door) openings, and you need to calculate the wall load transferred to the (strip) footing below. Tributary Area Method and Stresses of Pillar Design Methodology. Ppt Lo And Load Paths Powerpoint Ation. In all cases, except the formula presented by … The drainage area is the total area tributary to the point of design. Both have a tributary area of 12’0″. It is required to check whether the outputs of the models are correct. This is a little "trick' assignment I would give to a fresh graduate engineer - but a good example for you to understand the concept, of loads onto walls or columns from slabs they are supporting. The load per foot of beam is determined the same way as for headers. Amplified load: Dead Load = 1.2 (70 psf) (300 sqft) = 25200 lbs Live Load = 1.6 (1)(50 psf) (300 sqft) = 24000 lbs W Tributary Area Formula Structural Ering General. roof dead load: 10 psf x 12 ft = 120 pounds per lineal foot. w Holland Formula (1973) S p = S 1 p h Given different formula and recommended safety factor for using this formula is 2.0. The load on each sq ft is 100 PSF. total load:

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