Homework #$2$

LOAD ANALYSIS$/$DESIGN OF A STRUCTURE

A concrete floor system $($shown below$)$ is to be supported by four wide$-$ flange steel beams spaced $12$ feet apart that rest on masonry walls along the $44$ foot length. The floor carries a live load of $100l\frac{b}{f}{t}^2$ and the slab depth is $7^{\text{'}\text{'}}.$ Assume that reinforced concrete weighs $150\frac{\text{\#}}{f}{t}^3$ and the beams are simply supported on the above mentioned masonry walls. Design the lightest weight steel beams required to support this structure for moment capacity only assuming: $($Disregard any torsional loading conditions and don't forget the weight of the beams!$)$

a$.$ The beams are braced at the mid$-$span only

b$.$ The beams are brace at the third points of the span

c$.$ The beams are braced continuously along the beam.

Section A$-$A