β1 - Concrete Property

β1 is a concrete property that is the "ratio of depth of rectangular stress block to the depth to the neutral axis"

f'c (psi)β1
<40000.85
50000.80
60000.75
70000.70
>80000.65

β_1 = {0.85-0.05{\left(f'_c -4000 (psi)\over 1000\right)}} \ge 0.65

Note: The above equation is valid when f'c ≥ 4000 psi.

where:

f'c= the compressive strength of the concrete

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