This study delivers an equation of ultimate bearing capacity for a rectangular footing resting on layered soil under inclined load conditions. The finite element method approach and punching failure mechanism following the projected area approach are used. The parameters varied for the parametric study are thickness ratio (0.5 to 2), depth ratio (0.5 to 2), length to width ratio (1 to 4), load inclination angles (0˚ to 30˚), normalized cohesive strength of clay (0.5 to 2.0), friction angle of soil (φ = 30˚ to 45˚), and mobilized shearing resistance angle (ϕ to 2ϕ/3). An increment of 90.9% in bearing capacity was observed with an increase in friction angle from 30˚ to 45˚ for a load inclination angle of 30˚ and a thickness ratio of 2. The predicted equation indicates a reduction in bearing capacity of 82.5%, 67.89%, and 57.14% for load inclinations of 0˚, 15 ˚, and 30˚, respectively, at a friction angle of 30˚ when comparing the mobilized shearing resistance angle ϕ with 2ϕ/3. The results of the proposed expression for inclined loading were compared with the equations available in the literature and found consistent with an average deviation of 8.17%. The design charts developed from the present study will provide help in calculating the closest value that is essential for the design of foundations.
Yadav et al. (Tue,) studied this question.