Answer Happy

Consider the structural plans and section view shown on the following pages. The area loads on each level are as follows: ROOF: DL = 20 psf Llocc = 10 psf (occupancy live loads) S = 25 psf (snow load) 2nd FL: DL = 20 psf Llocc = 60 psf (occupancy live loads) . . Assume the following: Beam Material = A-36 Steel Unfactored Loads (total load = DL + LL +S) All material properties and section properties from tables provided on ELMS. For the purpose of this assignment, beam spans are assumed to be the distance between column center lines (see column grid and dimensions in drawings). Where applicable, you are allowed to use the tabulated formulae for max shear, max moment, and deflection posted on ELMS. . As the new Architect in the firm, you are asked to design the transfer beam connecting columns Bl and B3 (hereafter referred to as the 'subject beam') at the 2nd floor level. Note that the transfer beam includes support for a floating column that supports a portion of the roof.
1. Use the plans, section view and area loads to calculate the applied loads on the subject beam. Draw an elevation view of the subject beam showing the applied loads, support points and dimensions. 2. Based on the applied loads calculated above, calculate the maximum V and M. values for the subject beam. 3. Select a wide flange steel beam based on bending stress in the subject beam. Use the tabulated value of allowed bending stress from the tables posted to ELMS. Select the lightest section that will work (see depth constraints below). . Note - Your selection of beam is subject to the following constraints (which determine the maximum allowed depth of the wide flange section): the floor to floor heights shown on the section view. the thickness of the floor and ceiling finishes the subject beam is supporting. 2" floor finish 3" ceiling finish (non-plaster) the minimum allowed ceiling height on the ground level spaces - 10'. O o
4. Verify that the shear stress on the subject beam selected above is less than the allowed shear stress (see tables). 5. Verify that the maximum selection of the beam is less than the deflection allowed by the IBC table posted to ELMS. Hint - base your assessment on the live load ONLY. Note the type of ceiling finish specified above.
3 2 1 ,,O-,91 15'-0" А ROOF PLAN kl 12" METAL JOISTS 16" OC (TYP) JU 20'-0" A A 主 ,0-,91
A B 20-0" 16-0" A TRANSFER BEAM (CONTINUOUS) ,0-91 12" METAL JOISTS ad" od ESH FLOATING COLUMN AC 2 ,,O-,91 3 A 2ND FL PLAN
А B 20-0" 16'-0" 15'-0" SLAB ON GRADE 2 15'-0" А GRND FL PLAN
2 3 ROOF +22'-0" FLOATING COLUMN 2" THICK FLOORING TRANSFER BEAM 2ND FL +12'-0" 3" FINISH CEILING (NON-PLASTER) METAL JOIST (TYP) ,,0-01 MIN GRND FL SECTION A-A