![]() Safe bearing capacity of soil = 150 kN/m 2 Service load = factored load / factor of safety = 950.8 / 1.5 = 633.87 KN Step 2: Calculate an area of footings based on the factored axial loadĪrea of footing = service load / safe bearing capacity of soil Here we discuss about the only non-shifting case of isolated footing. It is compulsory to go for non-shifting case if there is possibility of moment reversal. Add 10% for self-weight of footing and soil above the footing.įactored axial load on footing = factored axial load from column + self-weight of footingĮccentricity on x-axis = M x/P = 54.042/864.37 = 0.0625 m = 62.5mmĮccentricity on y-axis = M y/P = 63.17 / 864.37 = 0.073 = 73 mmįor simplicity in construction and supervision, it is better to increase the thickness of footing rather than shifting but it makes the structure little bit uneconomical. The factored axial load and factored bending moment from the column is obtained from the structural software. Step 1: Calculate factored loads and bending moment The footing 8 is critical since it has highest axial force and high value of moment.įrom column, factored axial load = 864.37 KN and M x = 54.042 KN-m and M y = 63.1715 KN-m The structural design output value for isolated footing are: Footingįor design example, take the critical one. Grade of concrete = 25 N/mm 2 Grade of steel = 415 N/mm 2 ![]() Design an isolated footing of the given building as shown: ![]()
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