CRSI Design Handbook-2008
Scope of Load Tables
The scope of the tabulated designs provide a range of safe bearing capacity from 1,000 psf to 15,500 psf
in increments of 500 psf, which was considered adequate to include the poorest soil normally encountered
to high quality bearing clays. Footing sizes offered cover the range 4’-0” to 20’-0” square, considered
adequate for most structures using individual footings.
Use of Tabulated Designs
The tabulated designs plus details of Fig. 13-1 are arranged to provide a complete design for square
spread footings.
There is no strict code-mandated maximum length for a single (isolated) footing. In practice, spread
footings are typically limited to 20 ft. (Internet)
NAVFAC DM-2
Foundation Engineering Handbook (SP-349+)
Foundation Engineering By P.C. VARGHESE
300 Solved Problems Soil / Rock Mechanics and Foundations Engineering by Luis A.
Prieto-Portar PhD, PE
Foundation Engineering by P.C. VARGHESE
In situations where individual footings may touch or overlap each other and it is advisable to excavate the full site
instead of the ground under individual footings. (In such situations, careful analysis should be made as to whether
individual footings or rafts are more economical. In general, where settlements expected are small, individual strips
and footings tend to be cheaper than rafts, which will require much more steel to carry increased shear and bending
moments due to continuity.)
(Page 150)
Geotechnical Engineering by Murthy
(Page- 585)
Principles of Foundation Engineering by B.M. Dash
(Page 272)