by Engr. Mark Jefferson B. Castro, which provides a straightforward and practical approach aligned with Chapter 4 (Structural Concrete) National Structural Code of the Philippines (NSCP 2015)
): Applied to nominal strengths to account for material variability and workmanship. simplified reinforced concrete design 2015 nscp pdf 2021
| Parameter | Value / Formula | |-----------|----------------| | Min. f'c for structural | 20.7 MPa (21 MPa typical) | | Min. fy for main bars | 275 MPa (but 415 MPa common) | | φ – flexure | 0.90 | | φ – shear/torsion | 0.75 | | φ – compression (tied) | 0.65 | | φ – bearing | 0.65 | | Modulus ratio n | ( E_s/E_c \approx 8 ) to 10 | | Unit weight concrete | 23.6 kN/m³ | | ρ_min (beams) | max(1.4/fy, 0.25√f'c/fy) | by Engr
If $V_u \le \phi V_c / 2$, only minimum stirrups are needed. If $V_u > \phi V_c / 2$, calculate the steel shear capacity ($V_s$): $$V_s = \fracV_u\phi - V_c$$ If $V_u > \phi V_c / 2$, calculate
“Who wrote this?” he whispered.
The 2015 NSCP is largely based on ACI 318-14. The biggest change engineers noticed was the . In previous codes, provisions were grouped by topic (e.g., all beams in one chapter). In the 2015 NSCP, provisions are grouped by member type .