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Load Combination Lee & Lee Structural Engineering Inc. 2.1 Load Combinations CBC 2022, Section 1605 Strength Design or Load and Resistance Factor Design CBC 2022, Section 1605 1.1.4(D + F)EQ. 16-1 2.1.2(D+F) + 1.6(L+H) + 0.5(L r or S or R)EQ. 16-2 3.1.2(D+F) + 1.6(L r or S or R) + 1.6H + (f 1 L or 0.5W)f1 =1 for floors in places of public assembly,EQ. 16-3 4.1.2(D+F) + 1.0W + f 1 L + 1.6H + 0.5(L r or S or R) for live loads in excess of 100 psf EQ. 16-4 5.1.2(D+F) + 1.0E + 1.6H + f 1 L + f 2 S 0.5 for other live loads EQ. 16-5 6.0.9D + 1.6W + 1.6H f2 =0.7 for roof configurations that do not shed EQ. 16-6 7.0.9(D+F) + 1.0E + 1.6H show off the structure, and EQ. 16-7 0.2 for other roof configurations Allowable Stress Design 1.D + F EQ. 16-8 2.D + H + F + L EQ. 16-9 3.D + H + F + (L r or S or R)EQ. 16-10 4.D + H + F + 0.75(L ) + 0.75(L r or S or R)EQ. 16-11 5.D + H + F + (0.6W or 0.7E)EQ. 16-12 6.D + H + F + 0.75(0.6W) + 0.75L + 0.75(L r or S or R)EQ. 16-13 7.D + H + F + 0.75(0.7E) + 0.75L + 0.75 S EQ. 16-14 8.0.6D + 0.6W + H EQ. 16-15 9.0.6(D+F) + 0.7E + H EQ. 16-16 Seismic Load Effects and Combinations ASCE 7-16, Section 12.4 E = E h + E v ASCE 7-16, EQ. 12.4-1 E = E h - E v Use in Load Combination 7 or 8 ASCE 7-16, EQ. 12.4-2 E h = ρQ E E v = 0.2S DS D Zero for determining demand on soils for foundation design Load Combination with EQ for Strength Design 5.(1.2 + 0.2S DS )D + ρQ E + L + 0.2S for LL < = 100 psf, Use 0.5 L (except in garages or public assembly area) Use 1.41 D +1.3 QE +1.0 L 7.(0.9 - 0.2S DS )D + ρQ E + 1.6H if H counter acts E do not include it Use 0.69 D +1.3 QE Load Combination with EQ for Allowable Stress Design 5.(1.0 + 0.14S DS )D + H + F + 0.7ρQ E Use 1.15 D +0.9 QE 6.(1.0 + 0.105S DS )D + H + F + 0.525ρQ E + 0.75L + 0.75(L r or S or R) Use 1.11 D +0.683 QE +0.75 L 8.(0.6 - 0.14S DS )D + 0.7ρQ E + H Use 0.45 D +0.9 QE Notation D Dead Load E Combined effect of horizontal and vertical EQ induced as defined in ASCE 7, Sec. 12.4.2 Em Maximum seismic load horizontal and vertical seismic forces as set forth in ASCE 7, Sec. 12.4.351 F Load due to fluids with well-defined pressures and maximum heights Fa Flood load H Load due to lateral earth pressures, ground water pressure or pressure of bulk materials L 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 S Snow load T Self-straining forces arising from contraction or expansion resulting from temperature change, shrinkage, moisture change, creep in component metarials, movement due to differential settlement or combinations thereof W Load due to wind pressure 3 of 81 210 W 19th St 4/14/2025