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Building Design and Construction Handbook - Merritt - Ventech!

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STRUCTURAL STEEL CONSTRUCTION 7.71<br />

(7.29b), is not exceeded, <strong>and</strong> in addition, so that a/h is not more than [260/(h/t)] 2<br />

or 3.<br />

Solution of the preceding formulas for stiffener spacing requires assumptions of<br />

dimensions <strong>and</strong> trials. The calculations can be facilitated by using tables in the<br />

AISC ‘‘Manual of Steel <strong>Construction</strong>.’’ Also, Fig. 7.34 permits rapid selection of<br />

the most efficient stiffener arrangement, for webs of A36 steel. Similar charts can<br />

be drawn for other steels.<br />

If the tension field concept is to apply to plate girder design, care is necessary<br />

to ensure that the intermediate stiffeners function as struts. When these stiffeners<br />

are spaced to satisfy Eq. (7.29a), their gross area, in 2 (total area if in pairs) should<br />

be at least<br />

FIGURE 7.34 Plate girder web design. Chart shows the relationship between allowable shears<br />

in web of plate girders, with yield stress F y � 36 ksi, <strong>and</strong> web thickness, distance between<br />

flanges, <strong>and</strong> stiffener spacing.

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