Abstract: A track support structure (30) for a sectional overhead garage door (10) having rollers (16) for guiding the door (10) between open and closed positions. The track support structure (30) has a track (38) and a track support beam (40). Track (38) has an upper horizontal flange (38) and a lower trough (72). The free edge of the trough (72) has an inturned tubular bead (74) and the free edge of upper flange (38) has an inturned tubular bead (74). An angle-shaped track support beam (40) has legs (88) and (90). The free edges of legs (88) and (90) have respective tubular beads (92) and (94). Tubular beads (92), (94) have a diameter between 1½ and 2½ times the diameter of beads (74), (76) on track (38). Embodiments shown in FIGS. 8-10 include an automatic door operator (104) having a channel-shaped support beam (110, 110A) with tubular beads (116, 116A) on laterally extending flanges (112, 112A, 114, 114A).