beam-column joint of portal frame
connection of portal frame
high frame portal crane
lightweight steel portal frame
light-weighted steel portal frame
portal frame
门式刚架
厂房
门式框架
龙门架
桥门架
桥门构架
门架式支架
门架
支座
门框状构架
门形框架
门式钢架
portal frame type platform
portal frame with cable - strut
Portal frame with straight members
portal frame with tapered members