Design a base plate to support an axial load of 1280 kN if the allowable bearing strength of concrete foundation is 7.25 kPa. Fy = 250 MPa, Fs = 0.66 Fy, bf = 250 mm, and d = 306 mm. Determine the following; a. The trial area; b. The value of the actual pressure if the length of the plate is 430 mm and the width is 415 mm; c. The value of n; d. The value of m; e. The value of the moment; and, f. The thickness of the plate.

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Methods to Determine Vertical Stress

The load applied to the soil is transferred to the underground. The presence of water at soil pores and solid grains above the soil are the primary components that are responsible for the effective load transfer. Due to the load acting, the internal component of the soil or the underground formations undergoes deformations or a tectonic shift. The amount of deformation depends upon the amount of load acting on the soil surface, which indeed, depends on the weight of everything present above the soil. Due to this, the underground soil element develops internal stresses which try to resist the tectonic changes.