Chapter 9, Problem 9.8.3P

A beam must be designed to the following specifications:

• Span length = 35 ft

• Beam spacing = 10 ft

• 2-in. deck with 3 in. of lightweight concrete fill ( $w_c=115$ pcf) for a total depth of $t=5$ in. Total weight of deck and slab = 51 psf

• Construction load = 20 psf

• Partition load = 20 psf

• Miscellaneous dead load = 10 psf

• Live load = 80 psf

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

Assume continuous lateral support and use LRFD.

a. Design a noncomposite beam. Compute the total deflection (there is no limit to be checked).

b. Design a composite beam and specify the size and number of stud anchors required. Assume one stud at each beam location. Compute the maximum total deflection as follows:

1. Use the transformed section.

2. Use the lower-bound moment of inertia.