Längsträger
bridge girder
chassis leg
chassis rail
crawler frame
crawler support
fore-and-aft beam
fore-and-aft girder
frame side bar
frame side member
longeron
longitudinal beam
longitudinal girder
longitudinal member
longitudinal runner
longitudinal stringer
longitudinal support beam
longitudinal truss
main beam
main frame
main girder
side bar
side frame
side member
side rail
sole bar
stringer