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Simplified Reinforced Concrete Design as per the National Structural Code of the Philippines (NSCP) 2015

Key Changes in the 2015 NSCP affecting Concrete Design:

The following are the key concepts in reinforced concrete design according to the NSCP 2015:

3. Methodology: How the "Simplified" Approach Works

The "Simplified" approach generally refers to the application of the Strength Design Method (SDM) using derived coefficients rather than iterative strain-compatibility analysis for every problem.

  • Check with column slenderness provisions; if slender, use slender column design procedures.
  • Provide transverse reinforcement (ties/hoops) per seismic confinement and spacing rules.
  • | Chapter | Topic | |---------|-------| | 1 | Introduction to NSCP 2015 & Design Philosophies | | 2 | Analysis of Singly & Doubly Reinforced Beams | | 3 | T-Beams and Flanged Sections | | 4 | Shear and Diagonal Tension | | 5 | Bond, Development Length, and Splices | | 6 | Serviceability (Deflection & Cracking) | | 7 | Short Columns (Axial + Uniaxial/Biaxial Bending) | | 8 | Slender Columns | | 9 | Footings (Isolated, Combined, Strip) | | 10 | Two-Way Slabs (Direct Design & Equivalent Frame) | | 11 | Retaining Walls | | 12 | Detailing & Bar Scheduling |

    1. Common structural elements (beams, slabs, columns, footings).
    2. Practical assumptions (e.g., strain compatibility, rectangular stress block according to Whitney).
    3. Ready-to-use formulas for steel area (As), flexural strength (φMn), and shear reinforcement spacing.
    4. Design aids (tables and graphs) to avoid iterative calculations.

    Solution