An approximate cone roof steel structure was formed by rafters on girders and columns .This roof supported structure has been used in large diameter atmosphere tank .

• 置于横梁和立柱上的斜椽构成了形状近似正圆锥形表面的锥形顶钢结构,该结构逐渐成为常压大直径储罐罐顶支承的首选。