<p>Girder beam details including steel bar Girders often have an I-beam cross section composed of two load-bearing flanges separated by a stabilizing web, but may also have a box shape, Z shape, or other forms. <strong>A girder is the main load-bearing beam in a structure and is supported by posts.</strong> <strong>Joist is a structural member supported by beams</strong>. for more details of Girder download this autocad file,</p>