钢拱支架 Steel Arch

钢拱架 steel rib

拱式钢拱架 steel arch centering

梁式钢拱架 steel beam centering

钢轨拱形支架 arched rail set ; rail arch

钢拱架变形 steel arch frame deformation

加固的钢拱架 braced steel arch

钢桁架拱桥 steel truss arch bridge