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<br /> :��; ��°�� ���►(� ; C/��LCU ,Li�TIONS FOR FREEST/�NDING SIGt�lS
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<br /> Footing Design for Freestanding igri� and Flagpoles ; ; �
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<br /> Structure Dimensions & Loading ' � � ! �
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<br /> , Design wind pressure: P= ; 24J ; � psf ; '
<br /> Dead Load Co'mbination Coeff(ASD): S2= � 0.6 � ' ; ...FBC 1605.3.1 � ' � ' ;
<br /> ' Sign area 1: A1= � 104.5 j ; sq ft ...tributary area 1 for each footer(e.g.sign)' ' ,
<br /> Height of applied force above grade: h1= i 5:5 ; ; ft. i ...he.ight of area l,centroid � �
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<br /> Sign area 2: A2= ; 0.0 ; � Sq ft ...tributary area 2 for each footer(e.g.post); �
<br /> Height of applied force above grade: h2= i 0.0 ; i ft � ...height of area.2 centroid , ;
<br /> ; Overturning.IVlornent: � Mn = P*(A1*h1+A2*h2) � I
<br /> � Mn= 14.2 kip-ft � ' ' , �
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<br /> Sq/Rect �, ;Footing dimensions: B= � 5 i ; ft� ; L= 5 ft �
<br /> ' Footing depth: d= j �2.25 � . ft � , , ,
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<br /> Su,perstructure weight: Ds= � 200 ; Ib ; , :
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<br /> Footing weight: Df= � 8438� � Ib ! ...=150pcf*B#L*d,
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<br /> Total weight: D= i 8638' ' Ib � ...=Ds+Df �
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<br /> Soi I Sto�ength ...Fec rpb�es 1so6.z,1819.6 ! � ' ' �
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<br /> � Soil class: 4.Sand,'sil y sand;silty gravel � '
<br /> Lateral bearing strength: Plat= ! 150 ; psf/ft � , �
<br /> Vertical bearing strength: Pbrg= ` 2000: psf ; � ,
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<br /> Check Lateral Soil �earing Pressures ' , '� � �
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<br /> Passive lateral pressure,at bottom: Plb= � 337.5� , psf ; ...=Plat*d
<br /> Resisting moment.due to lateral soil pres: MI = � 1.42 ' kip-ft ...=Plb*�*(d/2)*(d/3) ' '
<br /> Portion of wind load resisted by lateral soil pre sure: ; '
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<br /> P1= ` 2.5 , � psf ; ...=MI#(a1*h1+A2*h2)
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<br /> Check Vertical Soil Bearing Pressures � ' � � � � �
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<br /> 2= 1.48 ft ..._(P-Pl)*(Al�h1+A2*h2)j/D I ... > B�6 ' ,
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<br /> qto'e=' 2*D/[3*L*(B/2-e)) � ...reaction belowfooterattoe; '
<br /> qtoe=, 1126 psf ; i ; ! , qtoe< Pbrg� � , OK
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<br /> Resisting moment due to Dead Load: Mv= . *D*B/2 :,
<br /> Mv= � 13.0 kip-ft ,
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<br /> Total Resisting IMomen#: Mto#= MI i; Mv , � ,
<br /> Mto#= 14.4 kip-ft Mtot>Mm OK ,
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