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In attempting to derive a rule of thumb for the thickness of a wall footing, it...

In attempting to derive a rule of thumb for the thickness of a wall footing, it can be shown that h = a Pu-b, where h = required thickness of wall footing in mm, Pu = ultimate load in kN/m. If the allowable bearing capacity of soil = 248 kN/m2, f'c =28 MPa and average load factor = 1.37, determine the factor a in the above rule of thumb.
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