Shape Factors for Limit Loads on Square and Rectangular Footings

Earlier proposals for shape factors used in calculations of bearing capacity of square and rectangular footings are examined. These proposals are based on empirical data for small footings, whereas a new suggestion for these factors presented in this paper is based on the elasto-plastic model of the soil and finite element analysis. The earlier factors modifying the contribution of cohesion and overburden were found to be conservative, but acceptable in design. However, the earlier proposals for the shape factor that affects the contribution of the soil weight to the bearing capacity indicate contradictory trends, and the factor calculated in this paper is suggested as an alternative.

[1]  Radoslaw L. Michalowski,et al.  Upper-bound load estimates on square and rectangular footings , 2001 .

[2]  L. Prandtl,et al.  Über die Härte plastischer Körper , 1920 .

[3]  Malcolm D. Bolton,et al.  Vertical bearing capacity factors for circular and strip footings on Mohr–Coulomb soil , 1993 .

[4]  K. Terzaghi.  Theoretical Soil Mechanics , 1943 .

[5]  Radoslaw L. Michalowski,et al.  THE RULE OF EQUIVALENT STATES IN LIMIT-STATE ANALYSIS OF SOILS , 2001 .

[6]  Albert Irénée Caquot,et al.  Équilibre des massifs a frottement interne : stabilité des terres pulvérulentes ou cohérentes , 1934 .

[7]  J. Brinch Hansen.  AKADEMIET FOR DE TEKNISKE VIDENSKABER , 2008 .

[8]  K. Willam,et al.  Triaxial failure criterion for concrete and its generalization , 1995 .

[9]  R L Michalowski,et al.  BEARING CAPACITY OF FOOTINGS OVER TWO-LAYER FOUNDATION SOILS. DISCUSSION AND CLOSURE , 1995 .

[10]  Radoslaw L. Michalowski,et al.  AN ESTIMATE OF THE INFLUENCE OF SOIL WEIGHT ON BEARING CAPACITY USING LIMIT ANALYSIS , 1997 .

[11]  Harvey J. Burd,et al.  Numerical studies of bearing-capacity factor Nγ , 1997 .

[12]  George Geoffrey Meyerhof,et al.  Some recent research on the bearing capacity of foundations , 1963 .

[13]  Hans L. Erickson,et al.  Bearing Capacity of Circular Footings , 2002 .

[14]  Aleksandar S. Vesic,et al.  Analysis of Ultimate Loads of Shallow Foundations , 1973 .

[15]  E. Beer,et al.  Experimental Determination of the Shape Factors and the Bearing Capacity Factors of Sand , 1970 .

[16]  R. Michalowski,et al.  Ultimate loads on square footings , 2002 .

[17]  H Q Golder,et al.  THE ULTIMATE BEARING PRESSURE OF RECTANGULAR FOOTINGS. , 1941 .