Access a 55-page preview of the Simplified Reinforced Concrete Design (2nd Ed.) .
For non-prestressed beams, the simplified rule from NSCP 2015 states: [ \rho_min = \frac3\sqrtf'_cf_y \quad (\textbut not less than \frac200f_y) ] Most simplified guides reduce this to: Use 200/fy unless f’c is very high. simplified reinforced concrete design 2015 nscp pdf link
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