ایستایی سقفها با سازه های خرپایی
ایستایی سقفها با سازه های خرپایی
Roof Trusses
Roof trusses perform the same function as rafters, collar ties, knee walls, and ceiling joists. The roof truss holds up the roof sheathing and shingles, transferring the roof loads to the outside or bearing walls...