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Engineering Analytics, Inc. CLIENT: MGC JOB NO: 110617 PAGE: 21428 <br />PROJECT: Spillway Drop Structure DATE: 12/17/2015 DATE CHECKED: 12/17/2015 <br />DETAIL: Short Energy Dissipator COMPUTED BY: LLM CHECKED BY: LCB <br />Given: Retained Wall Height at a, H,,:= 12 ft <br />Construction Load Height, Heonst:=2 ft <br />Unit Weight of Soil, 7:=130 lbs/ft3 <br />Stress Ratio, at rest, K,:=0.5 <br />Strength Reduction Factor, 0:=0.75 <br />Compressive Strength of Concrete, ,f'c:=4500 psi <br />Construction Load, Lconst:=130 Ib/ft2 <br />Earth Loading Factor of Safety, FSEarth:=1.6 <br />Live Loading Factor of Safety FSLL:=1.6 <br />Concrete Cover Thickness Dcover:=2 in <br />Calculate the maximum Shear Load at point a <br />Vsoilatrest 0.5 Ko•'Y•Ha2 =4.68.103 lbs <br />ft <br />Vc56 -103 lbs <br />nst:=con•a —. <br />ft <br />Vuc st:=FSEarth'Vsoilatrest+FSLL•Vconst=9.984.103 lbs <br />ft <br />d:=10 inches <br />¢V.:= 2. 0.12 . d .=1.207.104 lbs <br />ft <br />Thus, wall thickness of (D) D:=Dcover+d=12 in. will not require stirrups. <br />Calculate the maximum Moment at point a <br />3 <br />Msoilatrest := Ko .7 • Ha =1.872.104 ft • lbs <br />6 21 ft <br />Mconst := (L cons, <br />_ Ha ) —9.36-10 3 ft • lbs <br />2 ft <br />Mo :=Msoilatrest +Mconst = 2.808.104 ft. lbs <br />ft <br />Ma:=FSEarth'Msoi1atrest+FSLL-Mconst=4.493.104 ft, lbs <br />ft <br />Calculate the maximum Shear Load at point b <br />Retained Wall Height at b, Hb:=7 ft <br />