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Load Combination for Strength Design Application of the strength design load combinations that involve the seismic load E for the moment resisting frame Z = 0.4 Ca = 0.44 I = 1.0 ρ = 1.1 f1 = 0.5 Load Combinations for RC Design and Steel Design = live load, except roof live load, including any permitted live load reduction Lr = roof live load, including any permitted live load reduction R = rain load on the undeflected roof T = self‐straining force and effects arising from contraction or expansion resulting from temperature change, shrinkage, moisture change, creep in component materials, movement due to differential settlement, or combinations thereof W = load due to wind pressure The critical effect can occur when one or more of the contributing loads are not acting.ĭ = dead load E = earthquake load Em = estimated maximum earthquake force that can be developed in the structure F = load due to fluids with well‐defined pressures and maximum heights H = load due to lateral pressure of soil and water in soil L = live load, except roof live load, including any permitted live load reduction Lr = roof live load, including any permitted live load reduction Load Combinations Buildings, towers and other vertical structures and all portions thereof shall be designed to resist the load combinations in NSCP Section 203. Near‐source factors are revised to consider distance to source 0.7 second, else Ft = 0 wx : mass at floor level hx : height of floor from ground levelĮarthquake Loads Dynamic Analysis – Response Spectrum
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Load combinations for are changed due to the use of strength‐based wind loading based on ASCE 7‐10 Additional live load designations for parking, garage, and ramp live loading Basic wind speed are revised based on latest studies For communication towers, ANSI TIA/EIA 222G latest edition is fully referenced in the NSCP Significant Changes to Chapter 2 Minimum Design Loads UPDATES ON CHAPTER 2 : MINIMUM DESIGN LOADS NATIONAL STRUCTURAL CODE OF THE PHILIPPINES NSCP 2015, VOLUME 1