The following structure is a small local fire station building designed for easy

Question

The following structure is a small local fire station building designed for easy conversion to a house. The ground floor is a concrete slab on grade. Members to be evaluated are roof and second floor members.

Determine the load on the following members

A typical roof rafter at the residential section roof . Spacing is 2' O.C. Size is 2 x 10. Ignore the dormer span condition. Use appendix values

(Actual dimensions) for section properties.

A typical floor joist in the office/ residential section spacing at 16" O.C. size 2 x 12.

Second Floor Beam between col’s (2) and (3) at column line (B), size , 4 x 18.

Loads:

------------------------------

Floor Live loads = 40 psf

Roof Live Loads = 30 psf

Roof dead loads = 12 psf

parallel to inclined member length.

Floor dead loads = 16 psf                                                                         

Complete a preliminary sizing by checking the horizontal members by determining the required Sx or Ix values and the rafters for check for bending and shear. Assume the horizontal members are solid rectangular sawn lumber sections. Check floor deflection for the joist and beam where )max = L/360

Assume the members are simply supported and uniformly loaded.

Fv (shear) = 95 psi   Fb (bending) = 1,100 psi

E = 1,400,000 psi

Show all calculations,

load distribution diagrams, load translations,

shear and moment diagrams, shear and bending stress calculations.

Organize the work clearly and neatly with all steps indicated, units indicated, and box final answers.

Complete the information below:

A typical roof rafter at the residential section roof . Spacing is 2' O.C. Size is 2 x 10. Ignore the dormer span condition.

Dead Load translation roof, w =________________ plf

Live Load (x) trib. Width , w =______________plf

Total Load, w =____plf

V max =_______________draw shear diagram.

M max =_______________draw moment diagram.

Check fv =_______psi, Fv allowable =________psi, Safe, yes___ no___

Check fb =_______psi, Fb allowable =________psi, Safe, yes___ no___

I really need help with this because it's going to be on my final exam and I can't understand my professor when he tries to explain it. Plus our teacher assistant doesn't know how to do this problem at all. So, this is my last hope on trying to understand this type of problem. Thanks for your help.

Explanation / Answer

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