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Structural Concrete - Hassoun

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246 Chapter 6 Deflection and Control of Cracking<br />

(a)<br />

(b)<br />

Figure 6.7 (a) Main cracks in a reinforced concrete beam. (b) Spacing of cracks in a<br />

reinforced concrete beam.<br />

suggested by many investigators, ranging from 0.010 to 0.016 in. (0.25 to 0.40 mm) for interior<br />

members and from 0.006 to 0.010 in. (0.15 to 0.25 mm) for exterior exposed members. A limiting<br />

crack width of 0.016 in. (0.40 mm) for interior members and 0.013 in. (0.32 mm) for exterior<br />

members under dry conditions can be tolerated.<br />

Crack Control. Control grows in importance with the use of high-strength steel in reinforced<br />

concrete members, as larger cracks develop under working loads because of the high allowable<br />

stresses. Control of cracking depends on the permissible crack width: It is always preferable to

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