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STRUCTURAL STEEL SHAPES - 14070_29

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Figure  1-32.—Structural  steel  shapes  and  designations. terminology applied to structural steel members, the use of these members, and the methods by which they are connected. STRUCTURAL STEEL SHAPES Structural steel is manufactured in a wide variety of cross-sectional shapes and sizes. Figure 1-32 shows many of these various shapes. Figure  1-33  shows  cross-sectional  views  of  the W-shape   (wide  flange),  the  S-shape   (American Standard I-beam), and the  C-shape (American  Standard channel).   The   W-shape   is   the   most   widely   used structural  member  for  beams,  columns,  and  other load-bearing applications. As seen in the figure, it has parallel  inner  and  outer  flange  surfaces  that  are  of constant thickness. This flange design provides greater cross-sectional area in the flanges, which results in greater  strength  than  is  provided  by  the  S-shape,  which has a slope of approximately 17 degrees on the inner flange surfaces. The C-shape is similar to the S-shape in that its inner flange surface is also sloped approximately 17 degrees. The C-shape is especially useful in locations section  describes  structural  steel  shapes,  the Figure 1-33.—Structural shapes. where a single flat surface on one side is required. When used alone, the C-shape is not very efficient as a beam or column. However, efficient built-up members maybe constructed  of  charnels  assembled  together  with  other structural  shapes  and  connected  by  rivets  or  welds. The W-, S-, and C-shape structural members are designated by their nominal depth, in inches, along the 1-17



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