|
UNIFORM AND POINT LOAD ON CONTINUOUS FOOTING
<br />Footing Width (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 *(1 50-110))
<br />w = W*F'soil/12
<br />w (")
<br />12 X
<br />12 X
<br />15 X
<br />18 X
<br />21 X
<br />24 X
<br />12 X
<br />15 X
<br />18 X
<br />21 X
<br />24 X
<br />12 X
<br />15 X
<br />18 X
<br />21 X
<br />24 X
<br />12 X
<br />15 X
<br />18 X
<br />21 X
<br />24 X
<br />12 X
<br />15 X
<br />18 X
<br />21 X
<br />24 X
<br />30 X
<br />M = Fb*W*dA2f12"/6
<br />L = (2*M/w)A1f2
<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 1,4 60
<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. W idth (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 ,1 75 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 ,1 45 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 11 ,798
<br />2.45 7 ,055
<br />2.45 8 ,818
<br />2.45 10 ,582
<br />2.45 12 ,345
<br />2.45 14 ,1 09
<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 ,68 1
<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 />JO
|