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TABLE 26.11 Permissible Stress of Weld
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26.44 Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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26.45 Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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FIGURE 26.41 The AISC allowable range of stress sr or sr. (The Lincoln Electric Company.)
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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FIGURE 26.41 (Continued) The AISC allowable range of stress sr or sr. (The Lincoln Electric Company.)
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
WELDED CONNECTIONS 26.48
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FIGURE 26.42 Note the decreased fatigue strength of the lower joint because of the stress raiser. (The Lincoln Electric Company.)
(28), an asterisk appears beside the category for reversal R of load. This means that a modified formula should be used for determining maximum fatigue stress: max = sr 1 0.6K (26.6)
Using 0.6K provides a slight increase in fatigue allowable in the region of a complete reversal by changing the slope of the fatigue curve. The same butt joints used in a girder (3) do not show this increase in strength, and thus no asterisk appears beside R. This approach gives, for the first time, fatigue allowables for partial-penetration groove welds, (16) to (18). Note by (19) and (20) that the fatigue allowable for a member with a transverse attachment is higher when the attachment is less than 2 in long, measured parallel to the axis of the load. Although there may be a similar geometric notch effect or abrupt change in section in both, it is the stress raiser that is
FIGURE 26.43 There is a greater tearing action at the root in category G, warranting a lower fatigue allowable. (The Lincoln Electric Company.)
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WELDED CONNECTIONS 26.49
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important. The transverse bar in (19) is so short as far as the axis of the member and load are concerned that very little of the force is able to swing up and into the bar and then back down again. Consequently, the stress raiser is not severe. The longer bar attachment in (20), however, is sufficiently long to provide a path for the force through it and the connecting welds. Because of this force transfer through the welds, there will be a higher stress raiser and, as a result, a reduction of the fatigue strength of the member. The difference is illustrated in Fig. 26.42. Item (30) of the chart, which falls into category E, should not be confused with (37), category G. Both depict transverse fillet welds, but (30) provides a fatigue allowable for the member adjacent to the fillet weld, whereas (37) provides a fatigue shear allowable for the throat of the fillet weld. Knowing that the steady strength of a transverse fillet is about a third stronger than that of a parallel fillet, one might question why the fatigue allowable for a parallel fillet, (34) and (35), category F, is the same as that for a transverse fillet (36) and higher than that for a transverse fillet (37), category G. The fatigue strength of the transverse fillet (36) is actually higher than that of a parallel fillet (34), but they both fall into the range covered by category F. However, there is a difference in the two transverse fillet welds in (36) and (37). In (36) there may be a slight stress raiser because of the pinching together of forces as they pass through the weld. But in (37) there is a greater tearing action at the root of the weld, thus producing a lower fatigue strength and warranting a lower fatigue allowable. This is illustrated by Fig. 26.43.
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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