Description

Design of Strip Footing Pad, Strip Footing Beam and  Footing Excel Sheets

Design of Strip Footing Pad

Reinforcement Design For Strip Slabs

Shear Diagram

Reinforcements for  Positive Moments in Strip Footings Beam

Reinforcements for  Negative Moments in Strip Footings Beam

Footing Identification    =

Input Data:

Fy =

f’c =

Col. side,b =

S.Load, SL =

F.Load, FL =

B.Capacity,BC    =

How deep ?h      =

Footing width,W =

Footing Depth,D =

Enter Bar# Used =

SOLUTION:

Effective Bearing Capacity

qe = B.C. – 0.125 x h =

Area & sides of Footing:

A = S.L./ qe =

B = ( A )1/2 =

Factored Soil Pressure:

qu = F.L./ A =

Minimum Depth of Footing Based on Punching Shear

(A) Balanced Failure

Concrete Ultimate Strain εu

Steel Yield Strain

Depth of Neutral Axis

Stress Block Parameter β

Depth of Stress Block

For balanced failure condition, by definition, fs = fy =

Compressive stress in steel

Concrete Compressive Resultant

Balanced load Pb

Balanced Moment

Correspopndinf Eccentricity

(B) Tension Failure

Any choice of c SMALLER than cb, will give a point in the tension failure region of the interaction curve, with eccentricity LARGER than eb.

Chose c =3 in.

By definintion,   fs = fy =

Compressive stress in steel =

Wih stress block depth a =

Compressive resultant =

Thrust Pn =

Moment Capacity

Correspopndinf Eccentricity

(C) Compression Failure

Any choice of c LARGER than cb, will give a point in the compression failure region of the  interaction curve, with eccentricity SMALLER than eb.

Chose c = 18 in.

For which stress block depth a =

Compressive resultant =

Stress in tension steel =

Compressive stress in steel =

Column Capacity =

Moment Capacity

Correspopndinf Eccentricity

(D) Concentric Loading

This condition corresponds to c = ∞ and e = 0.