Chapter 9, Problem 9.8.9P

Use the composite beam tables and select a W-shape and stud anchors for the following conditions:

• Span length = $18^{\prime }-6^{″}$

• Beam spacing = 9 ft

• Total slab thickness = $5\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.$ in. (the slab and deck combination weighs 57 psf). Lightweight concrete with a unit weight of 115 pcf is used

• Construction load = 20 psf

• Partition load = 20 psf

• Live load = 225 psf

• $F_y=50$ ksi and $f_c^{\text{'}}=4$ ksi

A cross section of the formed steel deck is shown in Figure P9.8-9. The maximum live-load deflection cannot exceed L/360 (use a lower-bound moment of inertia).

a. Use LRFD.

b. User ASD.