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Engineering Analytics, Inc. <br />i N <br />CLIENT. MGC JOB NO: 110617 PAGE: 1 of 1 <br />PROJECT: Spillway Drop Structure DATE: 11/30/2015 DATE CHECKED: 12/23/2015 <br />DETAIL: Seismic vs. Construction Moment COMPUTED BY: LCB CHECKED BY: LLM <br />Given: Retained Wall Height, H:=15 ft <br />Construction Load Height, Hconst:=2 ft <br />Unit Weight of Soil, 7:=130 lbs/ft3 <br />Stress Ratio, at rest, Ko := 0.5 <br />Stress Ratio, Active KA := 0.28 <br />Stress Ratio, Earthquake, Kms:=0.75 <br />Strength Reduction Factor, 0=10-75 <br />Compressive Strength of Concrete, f'c:=4500 psi <br />Earth Loading Factor of Safety, FSEarth:-1.6 <br />Live Loading Factor of Safety, FSLL:=1.6 <br />Earthquake Loading Factor of Safety FSEQ:=1.0 <br />Find: Controlling Moment Load Combination <br />Solution: <br />Calculate the maximum Moment at the Base of the Wall <br />MsoilatTest := 0.5 Ko • ry • HZ • 3 = 3.656.104 ft • lb <br />f <br />Msoilactive = 0.5 KA • y • H2 • 3 = 2.048.104 ft • f t <br />Mconst :=Ko • Y • Hconst • H • H =1.463.104 ft.lbs <br />2 ft <br />MEQ:=0.5 KA'KaE•ry•H2 • 3 •H=3.071.104 ft. ft <br />Muconst :=FSEarth •Msoilatrest +FSLL •Mconst = 8.19.104 ft • lbs <br />ft <br />MuEQ FSEarth •Msoilactive +FSEQ •MEQ = 6.347.104 ft • lbs <br />ft <br />Since MuEQ < Muconst use Muconst for Moment Calcs <br />