In each of the following design examples the net allowable bearing pressure of the soil will be taken as na = 300 kN/m2.
These examples concentrate on the analysis of foundation bases to limit bearing pressures arising from combinations of vertical loads, horizontal loads, and bending moments.
The design of these bases, to resist bending and shear, should be carried out in a similar manner to Design
Examples earlier in this blog. Calculations for bending moments and shear forces within the base will need to make due allowance for the variation in bearing stresses across the base.
Pad base –axial load plus bending moment (small eccentricity) A column pad base is subject to an axial load of 200 kN (dead) plus 300 kN (imposed), and a bending moment of 40 kNm. To suit site constraints, the base is limited to a length of L = 1.8...