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Structural Concrete - Hassoun

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128 Chapter 3 Flexural Analysis of Reinforced <strong>Concrete</strong> Beams<br />

Figure 3.28<br />

width b e<br />

.<br />

(a) T-section and (b) I-section, with (c) illustration of effective flange<br />

The ACI Code, Section 6.3.2.1, prescribes the following limitations on the effective flange<br />

width b e , considering that the span of the beam is equal to L:<br />

1. b e = L/4<br />

2. b e = 16t + b w<br />

3. b e = b,whereb is the distance between centerlines of adjacent slabs<br />

The smallest of the aforementioned three values must be used.<br />

These values are conservative for some cases of loading and are adequate for other cases. Anb<br />

similar effective width of flange can be adopted for I-beam sections. Investigations indicate that the<br />

effective compression flange increases as load is increased toward the maximum value [7]. Under<br />

working loads, stress in the flange is within the elastic range.

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