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Structural Concrete - Hassoun

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3.5 Load Factors 91<br />

h<br />

c b<br />

d d t<br />

A s<br />

b<br />

ε c = 0.003<br />

F y<br />

ε t =<br />

E s<br />

ε t = 0.002 ( f y = 60 ksi)<br />

Figure 3.5 Balanced strain section (occurs at first yield or at distance d t<br />

).<br />

Table 3.1 Strain Limits of Figure 3.4<br />

Section Condition <strong>Concrete</strong> Strain Steel Strain Notes (f y<br />

= 60 ksi)<br />

Compression controlled 0.003 ε t ≤ f y /E s ε t ≤ 0.002<br />

Tension controlled 0.003 ε t ≥ 0.005 ε t ≥ 0.005<br />

Transition region 0.003 f y /E s

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