RECTANGULAR SPREAD FOOTING ANALYSIS
This program is a workbook consisting of five (5) worksheets, described as follows:
Footing (net pier loads) - Individual rectangular spread footing analysis (with net pier loadings)
Footing (breakdown of loads) - Individual rectangular spread footing analysis (with breakdown of loadings)
Footings (Table) - Multiple rectangular spread footings analysis and design (table format)
Footings (Pier Table) - Multiple rectangular spread footings - pier analysis (table format)
Program Assumptions and Limitations:
1.This program assumes that the spread footing is in fact "rigid", so that the bearing pressure is distributed linearly on a homogeneous soil.(Note: the actual footing is generally not "rigid", nor is the pressure beaneth it distributed linearly.However, it has been found that solutions using the assumed "rigid" concept are adequate and generally result in a conservative design.)
"Analytical Approach to Biaxial Eccentricity" - by Eli Czerniak
Journal of the Structural Division, Proceedings of the ASCE, ST4 (1962), ST3 (1963)
"Bearing Pressures for Rectangular Footings with Biaxial Uplift" - by Kenneth E. Wilson
Journal of Bridge Engineering -Feb. 1997
input in each of the two table format worksheets.
A while back at a special request, I compiled a PDF file containing example problems from five (5) different references concerning biaxially loaded footing analysis, for the purpose of verifying the biaxial analysis performed in the "FOOTINGS.xls" spreadsheet workbook.
Footings and Foundations
Spread Footing Design
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