1 for rectangular hollow steel pipe or box section, B and B are flange dimensions; D and D are web dimensions. Flange and Web<br>The difference is whether the member is bent to the main shaft or the secondary shaft. See Section 7.1 for details.<br>For rectangular hollow steel pipe section, dimensions B and D are shown in footnotes a to C of table 7.2.<br>2 for angle steel, B is the extension limb size; D is the size of the connecting limb.<br>For sections made of thick steel plates, special attention shall be paid to avoid lamellar tear failure.
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