(Answered): The floor system shown below is in a heavy manufacturing facility, and is to carry a superimposed s ...

The floor system shown below is in a heavy manufacturing facility, and is to carry a superimposed service dead load 35 psf (in addition to the self weight), and a service live load of 220 psf. All beams are 12 inches wide. 21-0"- 21'-10" -- - -+-+- +-+- 4.- t- -- Transverse beam -18-0" o- 18'-0"- -61-8" - - Longitudinal Girder -#-+-+-+-+- -+-- of bearing - -- -- - ! i ! 7'-0"i7-07- 0 21-04 -21-10"-- Transverse beam 15" --21-10----21'-0"— - -- 85'8"- 21–0" 21-10" 1 21'-10" Section at wall 1. Design a continuous concrete floor slab for this application (determine the slab thickness and select the reinforcing bars to be used in the slab). Show your results in a final sketch. Use Grade 60 steel and 3,500 psi concrete. Include considerations for shrinkage/temperature steel. 2. A design alternative has been suggested that will use precast concrete floor panels 7 feet wide and 21 feet long instead of a cast-in-place slab. Compare the maximum positive and negative moments that you used in your slab design with the values that you would use for a simply supported precast slab design (assume the precast slab is the same thickness as your cast-in-place continuous slab). 3. A colleague commented that if the precast panel option is used, some care may have to be exercised either in the panel design and/or in their handling, to ensure the panels are not damaged prior to placement. What do you think your colleague is worried about here, and do you share their concern?