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UNIFORM AND POINT LOAD ON CONTINUOUS FOOTING
<br />Footing \Nidth (FW) =
<br />Footing Depth (FD) =
<br />Soil Bearing (SB) =
<br />Max. Soil Bearing =
<br />Plain Concrete Design:
<br />F'c =
<br />Tension Fb =
<br />Procedures:
<br />12 in
<br />12 in
<br />1,500 psf
<br />1,500 psf
<br />2,500 psi
<br />80 psi
<br />Fsoil = ((D-FD)/12*1D)+SB
<br />F'soil = Fsoii-(D/12*(150-11 0))
<br />w = W*F'soil/12
<br />1~·=-~ ~}l 8 12 X
<br />15 X
<br />18 1·--· f----
<br />1
<br />~-
<br />f r--
<br />1
<br />X
<br />-~}-+x
<br />24 , X
<br />12 X
<br />!----15--1 X
<br />------iL_
<br />18 I X r-· 21 lx ~------
<br />1·-~-
<br />i
<br />l-
<br />1
<br />24 X ---·-'i2 i X
<br />15·l·x
<br />I ~--
<br />18 l X ----+
<br />21 I X !----.. --·-·-.... ..,. ..... -
<br />24 ix 1--
<br />tt--
<br />~-12
<br />15
<br />18 ---· 21
<br />X
<br />lx
<br />X r--
<br />X
<br />1-.24~
<br />12 X
<br />15 X i--
<br />1·-·
<br />---·
<br />, ____ _
<br />J r-·-
<br />'18 X
<br />2'1 1X ---·--1 I 24 i X ------r· .~.-l X 1_
<br />M = Fb*W*d/\2/12"/6
<br />L = (2*M/w)A1 /2
<br />Pmax = 2*L*w
<br />D (") Fsoil (psf) F'soil (psf)
<br />5 1,500 1,483
<br />12 1,500 1,460
<br />12 1,500 1,460
<br />12 1,500 1,460
<br />12 1,500 1,460
<br />12 1,500 1,460
<br />15 1,500 1,450
<br />15 1,500 1,450
<br />15 1,500 1,450
<br />15 1,500 1,450
<br />'15 1,500 1,450
<br />18 1,500 1,440
<br />18 1,500 1,440
<br />18 1,500 1,440
<br />18 1,500 1,440
<br />18 1,500 1,440
<br />21 1,500 1,430
<br />21 1,500 1,430
<br />21 1,500 1,430
<br />21 1,500 1,430
<br />21 1,500 1,430
<br />24 1,500 1,420
<br />24 1,500 1,420
<br />24 1,500 1,420
<br />24 1,500 1,420
<br />24 1,500 1,420
<br />24 1,500 1,420
<br />Soil Density =
<br />Concrete Density =
<br />Inc. Width (IW) =
<br />Inc. Depth (ID) =
<br />w {#/ft} M ('#)
<br />1,483 333
<br />1,460 1,920
<br />1,825 2,400
<br />2,190 2,880
<br />2,555 3,360
<br />2,920 3,840
<br />1,450 3,000
<br />1,813 3,750
<br />2,175 4,500
<br />2,538 5,250
<br />2,900 6,000
<br />1,440 4,320
<br />1,800 5,400
<br />2,160 6,480
<br />2,520 7,560
<br />2,880 8,640
<br />1,430 5,880
<br />1,788 7,350
<br />2,145 8,820
<br />2,503 10,290
<br />2,860 11,760
<br />1,420 7,680
<br />1,775 9,600
<br />2,130 11,520
<br />2,485 13,440
<br />2,840 15,360
<br />3,550 19,200
<br />110 pcf
<br />150 pcf
<br />0 psf
<br />0 psf
<br />L (ft) Pmax {#}
<br />0.67 1,989
<br />1.62 4,736
<br />1.62 5,919
<br />1.62 7,103
<br />1.62 8,287
<br />1.62 9,471
<br />2.03 5,899
<br />2.03 7,374
<br />2.03 8,849
<br />2.03 10,324
<br />2.03 1~
<br />2.45 /7,055
<br />2.45 '-..ar818
<br />2.45 10,582
<br />2.45 12,345
<br />2.45 14,109
<br />2.87 8,202
<br />2.87 10,252
<br />2.87 12,302
<br />2.87 14,353
<br />2.87 16,403
<br />3.29 9,340
<br />3.29 11,676
<br />3.29 14,011
<br />3.29 16,346
<br />3.29 18,681
<br />3.29 23,351
<br />Note: For point loads on footings with uniform loads, take the difference
<br />between "w" above and the uniform load, then multiply by two and by
<br />"L" above for P'max.
<br />A
<br />·~
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