Prestressed metal sheet structural system and construction method thereof

The invention relates to a prestressed metal sheet structural system and a construction method thereof. The system comprises a structural framework, a lower chord pull rope, a roof panel and a tensioning auxiliary device; the structural framework consists of a steel column, an edge beam and an inner beam; the edge beam is erected at the top of the steel column; the inner beam is parallel to the edge beam and arranged in a space encircled by the steel column; the lower chord pull rope is arranged vertical to the inner beam, and a roof brace rod is arranged at the position of the lower chord pull rope vertical to the inner beam; thick plate strips parallel to the lower chord pull rope are arranged at the top of the brace rod; the roof panel is a prestressed metal sheet, and is arranged between and riveted with the two thick plate strips; and the end of the roof panel is connected with the edge beam through the tensioning auxiliary device. The system realizes combined stress of the roof panel of the metal sheet