National Structural Code of the Philippines (NSCP) 2015 PDF

The National Structural Code of the Philippines (NSCP) 2015 provides design standards for steel structures in accordance with Philippine building regulations and safety standards. The steel section in this code is based primarily on the American Institute of Steel Construction (AISC) specifications...

The National Structural Code of the Philippines (NSCP) 2015 provides design standards for steel structures in accordance with Philippine building regulations and safety standards. The steel section in this code is based primarily on the American Institute of Steel Construction (AISC) specifications but adapted for local conditions. Below is an overview and guide to reviewing the key topics in the steel section: 1. Design Principles Load and Resistance Factor Design (LRFD): Emphasizes safety by considering both load variability and material strength. Allowable Strength Design (ASD): Ensures structures remain elastic under service loads. 2. Material Properties Steel grades and yield strengths commonly used in the Philippines. Specifications for structural steel (e.g., ASTM A36, A572). 3. Structural Components Tension Members Design for yielding in the gross section. Checks for rupture in the net section and block shear. Compression Members Stability design using effective length factors. Slenderness ratio limits for local and global buckling. Flexural Members (Beams) Lateral-torsional buckling considerations. Web buckling and local flange buckling checks. Shear Members Calculation of shear strength for webs. Shear buckling and stiffener requirements. Composite Members Steel-concrete interaction. Shear connectors and their design. 4. Connections Bolted connections: o Slip-critical and bearing-type bolts. o Tension and shear capacity checks. Welded connections: o Types of welds (fillet, groove). o Design based on strength and ductility. Gusset plates and eccentric connections. 5. Stability Requirements Overall Structural Stability: o Braced and unbraced frames. o Consideration of second-order effects (P-Delta effects). Member Stability: o Effective length factors for columns and beams. 6. Seismic Considerations Special detailing for ductility in seismic regions. Requirements for connections in seismic-resisting systems. 7. Design Aids Tables for section properties and capacities. Charts for buckling and slenderness limits. Study Tips for Review 1. Understand Code Structure: Familiarize yourself with how the NSCP steel section is organized. 2. Focus on Key Formulas: Derive and understand the application of critical design equations. 3. Work on Examples: Practice with example problems, especially for local conditions.  4. Use Supplementary Resources: Reference AISC manuals and textbooks on steel design for a deeper understanding. 5. Review Seismic Provisions: Pay special attention to seismic design, as the Philippines is in a high-seismicity zone. National Structural Code of the Philippines (NSCP) 2015: General Terms 1. Structural Steel Steel materials used in construction with specified strength and ductility for load-bearing. 2. Design Strength The nominal strength of a member multiplied by the resistance factor (ϕ\phi). 3. Nominal Strength The capacity of a structure or member calculated using specified material properties and dimensions. 4. Load and Resistance Factor Design (LRFD) A design methodology considering the strength of materials and factored loads. 5. Allowable Strength Design (ASD) A design approach based on service loads and allowable stress limits. Member Types 1. Tension Member A structural member subjected to axial tensile forces. 2. Compression Member A member subjected to axial compressive forces, prone to buckling. 3. Beam (Flexural Member) A member primarily resisting bending moments. 4. Composite Member A member combining steel and concrete, acting together to resist loads. Connection Types 1. Bolted Connection A joint using bolts to connect structural elements. 2. Welded Connection A joint where elements are fused together using welds. 3. Slip-Critical Connection A bolted connection where slip is prevented under service loads. 4. Bearing-Type Connection A bolted connection relying on bolt bearing on the connected elements. Buckling and Stability 1. Buckling A failure mode due to instability under compressive loads. 2. Effective Length Factor (KK) A factor used in calculating the effective length of a compression member for buckling analysis. 3. Lateral-Torsional Buckling A failure mode where a beam twists and bends simultaneously under load. 4. Slenderness Ratio (KL/rKL/r) A ratio indicating the susceptibility of a member to buckling. Seismic Terms 1. Ductility The ability of a material or structure to deform plastically without failure. 2. Seismic-Resisting System A structural configuration designed to resist earthquake forces. 3. Overstrength Factor (Ωo\Omega_o) A factor accounting for the additional strength beyond the design requirements. 4. Response Modification Factor (RR) A factor reducing seismic forces in design to account for ductility and redundancy. Connection and Section Properties 1. Shear Strength The capacity of a section or connection to resist shear forces. 2. Moment of Inertia (II) A geometric property indicating resistance to bending. 3. Section Modulus (SS) A geometric property used in flexural stress calculations. 4. Plastic Section Modulus (ZZ) The section modulus at which a member reaches plastic capacity. 5. Net Section Area (AnA_n) The area of a member after accounting for bolt holes or other reductions. 6. Block Shear A combination of tension and shear failure in connections. Welding Terms 1. Fillet Weld A triangular weld joining two surfaces at right angles. 2. Groove Weld A weld filling a groove between two members. 3. Weld Metal The deposited metal that forms the joint in welding. 4. Weld Strength The capacity of the weld to resist applied loads. Key Coefficients 1. Resistance Factor (ϕ\phi) A factor to account for uncertainties in strength and construction. 2. Safety Factor (ω\omega) A multiplier used in ASD to account for uncertainties. 3. Shape Factor A factor reflecting the difference between plastic and elastic section modulus (Z/SZ/S).