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8-ll-20 ROBERT JAMES&ASSOCIATES,Inc. Sht.4 of 5 <br /> Design of Snade Footing; <br /> Allowables: <br /> Lateral passive pressure against foundation: (lbs./sq.ft per foot) PP:= 200 <br /> Static soil pressure: (lbs./sq•ft) SSP= 2000 <br /> Dynamic soil pressure: (lbs./sq.ft) DSP= 2660 <br /> Foundation pars neters: <br /> Depth of footing below grade: (ft) DF:= 3.0 <br /> Width of footing: (E) WF= 22.0 <br /> Length of footing: (ft} LF:= 3.0 <br /> (Wind direction) <br /> Weight of structure and foundation: <br /> Design weight of concrete: (lbs./cu.ft) CWT:= 150 <br /> Sign,trim and structure weight: (lbs.) SWT:= 950 <br /> Masonry weight: (lbs.) PWT:= 1250 <br /> Footing weight: (lbs.) FTWT:= DF•WF•LF•CWT FTWT=29700 <br /> Net weight: (lbs.) NETWT:= SWT+ PWT+ FTWT NETWT=31900 <br /> Check Factor of Safety <br /> Overturning moment about heel point of foundation: (ftlbs.) <br /> Mo:= Va•DF+ Ma ( 1 Mo=25982.55 <br /> Total passive pressure on footing: (lbs./sq.ft) Tpp= PP•DF2•I WF Tpp= 19800 <br /> Resisting moment about the heel point: (Elk <br /> Mr:= NETWT.I 2FJ + Tpp•I DFJ Mr=67650 <br /> Factor of Safety: FS= Mr FS=2.604 > 1.5 OK <br /> Mo <br /> Check soil bearing pressures <br /> Static soil pressure: (lbsJsq.ft) SBP:= NETWT SBP=483.333 < SSP=2000 OK <br /> LF•WF <br /> Dynamic soil pressure: (lbs./sq.ft.) <br /> IM <br /> o—Tpp•(DF�] <br /> e: e=0.194 <br /> NETWT <br /> LF <br /> =0.5 > e=0.194 <br /> 6 <br /> NETWT qa:= I WF LF I T1 + (6.LFF1 qa=670.683 < DSP=2660 OK <br />