EVALUATION OF BEARING CAPACITY OF SQUARE BOTTOM FOOTING UNDER COMBINED LOAD AFTER ULTIMATE BEARING CAPACITY

The aim of this study is to clarify the bearing capacity and lateral resistance of a square footing after reaching ultimate bearing capacity. A failure mechanism for the ground beneath a square footing under combined load is proposed based on the upper bound theorem. By applying this failure mechanism, the reduction in ultimate bearing capacity of a square footing can be predicted. Furthermore, the bearing capacity and lateral resistance after reaching ultimate bearing capacity are evaluated. The validity of this evaluation is confirmed through comparison with experimental results. The findings may contribute to the seismic design of spread foundations.