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					DESIGN OF RECTANGULAR SPREAD FOOTING                  Prepared by Dr. A.M.Reinhorn
                                                                    S.U.N.Y/Buffalo
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DATA                                    Alt #1      Alt #2       Alt #3      Alt #4
         STEEL STRENGTH (Ksi)             40.00     60.00        60.00       60.00
         CONCRETE STRENGTH (Ksi) 3.00                3.00         3.00        3.00
         SOIL BEARING PRESSURE (Ksf) 4.00            5.00         5.00        5.00
         SOIL WEIGHT DENSITY (Kcf) 0.11              0.10         0.10        0.10
         DEPTH (Feet)                       4.00     3.00         3.00        3.00
         COLUMN DIMENSION (Inch) a 18.00            18.00        18.00       18.00
         COLUMN DIMENSION (Inch) b 24.00            32.00        32.00       32.00
         LIVE LOAD (Kips)                200.00   400.00        230.00      190.00
         DEAD LOAD (Kips)                300.00   230.00        230.00      190.00
         RESTRICTED DIMENSION (Feet)9.00             8.00         8.00        8.00
FINAL DIMENSIONS
         SIZES      A (Ft)                15.30     17.30        12.70       10.50
                B (Ft)                      9.00     8.00         8.00        8.00
                H (In)                    27.00     44.00        27.00       22.50
         REINFORCEMENT a (Sq.in/foot) 1.98           1.28         1.10        0.88
                b (Sq.in/foot)              0.55     0.96         0.55        0.44
         DOWELS         (Sq.in)             2.16     2.88         2.88        2.88
COMPUTATIONS
         REQUIRED AREA (Sq.ft) A 137.50           138.60        101.20       83.60
         REQUIRED DIMENSION (Feet) 15.30   a        17.30        12.70       10.50
                                      b     9.00     8.00         8.00        8.00
         DEPTH (d) - (Inch)           d 23.00       40.00        23.00       18.50
         ACT. BRNG. PRSSR. (Ksf) q          3.96     5.08         4.87        4.82
         ULTIMATE DESIGN LOAD (Kips)     760.00  1002.00        713.00      589.00
         DESIGN BRNG. PRSSR. (Ksf)          5.53     7.23         7.05        7.05
VERIFICATION OF LONGER DIRECTION (a)
         ONE WAY SHEAR (Psi)              99.80     68.78        94.02       93.89
         ALLOWABLE SHEAR (Psi)            93.00     93.00        93.00       93.00
         PUNCHING SHEAR (Psi)            169.47     76.19       136.47      154.96
         ALLW. PUNCHING SHEAR (Psi)      186.23   179.23        186.23      186.23
         BENDING MOMENT (K-Ft) #######           1804.76        883.78      570.68
         REQ. REINF. (Sq.in per foot)       1.98     1.28         1.10        0.88
         MIN. REINF. (Sq.in per foot)       0.55     0.96         0.55        0.44
         ACT. REINF. (Sq.in per foot)       1.98     1.28         1.10        0.88
VERIFICATION OF SHORTER DIRECTION (b)
         ONE WAY SHEAR (Psi)              31.71      0.00        19.15       35.70
         ALLOWABLE SHEAR (Psi)            93.00     93.00        93.00       93.00
         PUNCHING SHEAR (Psi)            169.47     76.19       136.47      154.96
         ALLW. PUNCHING SHEAR (Psi)      186.23   179.23        186.23      186.23
         BENDING MOMENT (K-Ft)           517.97   444.69        318.14      263.03
         REQ. REINF. (Sq.in per foot)       0.50     0.14         0.24        0.30
         MIN. REINF. (Sq.in per foot)       0.55     0.96         0.55        0.44
         ACT. REINF. (Sq.in per foot)       0.55     0.96         0.55        0.44
VERIFICATION OF BEARING
ACT. PRESSURE (Kips)    760.00   1002.00    713.00    589.00
ALLW. PRESSURE (Kips)   771.12   1028.16   1028.16   1028.16
MIN. DOWELS (Sq.in)       2.16      2.88      2.88      2.88
REQ DOWELS (Sq.in)        2.16      2.88      2.88      2.88

				
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