HW3_ Dead Load and Load Tracing

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Feb 20, 2024

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CM220 INTRO TO STRUCTURES SPRING 2024 HW 3: Dead Load and Load Tracing Ogi Mircic 02/07/24

1 - What Building Code is applicable for this house in the City of Flagstaff? - The Building code that is applicable for this house is the IRC 2006 with City of Flagstaff Amendments, which is found on sheet 101. 2 - Determine the following design loads and describe where you found this information A) Live load - The live load is 40 psf for residentials. B) Roof snow load - The roof snow load is 40 psf. C) Wind speed - The wind speed load is 90 mph. All three of these loads can be found on the top left corner of sheet 101. 3 - Determine Dead Load of 1st floor A) Determine the dead load of the first floor of the addition - To calculate the dead load of the first floor, the framing and flooring must be added together. The addition of the first floor 2X10 DFL #2 BTR @24" OC, which has a psf of 6. This information is found on table C3-1.1a of ASCE/SEI 7-22. The weight of one sheet of 4'x8'x1" is 106.2 pounds. To find the psf of the osb on the first floor, one would divide by 32 which would result in 3.318, which would be the psf of the osb on the first floor addition. By adding these two, the resulting psf on the first floor addition is 9.318. B) Sketch a cross-section of the floor showing all materials included and their respective unit weights -

4 - Determine the Dead Load of the Exterior wall A) - Using the drawings, determine the line-load weight of the exterior wall on the 2nd floor (2nd floor to roof) - The exterior walls are made up of 2x6 @ 16" OC lumber with ½” Gypsum board and ⅜” wood structural siding. Referring back to the ASCE, the weights of each can be determined. The psf of the 2x6 lumber @16” OC is 5. The psf of the ½” gypsum board is 2, but in this case it is 4 since it is being used on both sides of the wall. The psf of the ⅜” siding is 1.2, which is found by multiplying .4 (the psf of ⅛” of siding) by 3. By adding all of these together, the psf comes out to 10.2. However, the wall is 9 feet tall, so the plf of the exterior wall would come out to 91.8 after multiplying psf by feet. B) Sketch a cross section of the wall showing all materials included and their respective unit weights -

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