A built-up beam includes a pair of I-beams each having opposing flanges, a web that extends between the opposing flanges, a plurality of flange openings in each of the opposing flanges, a plurality of web openings in the web, and a plurality of bolt holes in one of the opposing flanges. The I-beams are stacked together flange-to-flange in a stacked beam configuration and a plurality of bolts extend through the plurality of bolt holes and secure the pair of I-beams together in the stacked beam configuration.