Expandable-connection special-shaped metal roof panel rib with combined stress performance

The invention discloses an extensible connection special-shaped metal roof panel rib with combined stress performance, which comprises a first metal roof panel, a second metal roof panel and a support metal connecting sheet which are correspondingly connected, the special-shaped metal roofing board is characterized in that special-shaped metal roofing board ribs are arranged at the joints of the first metal roofing board, the second metal roofing board and the support metal connecting pieces, and each special-shaped metal roofing board rib is composed of a top lockrand rib, a middle special-shaped rib and a bottom expansion rib; the panel edges of the first metal roof panel and the second metal roof panel are mutually locked and connected; the first metal roofing board and the second metal roofing board are connected in a continuous welding mode. The first metal roof board and the second metal roof board are connected with the support metal connecting piece in a welded mode after being buckled. Through the pl