Question

Questions (28-30) For the continuous concrete footing shown constructed in medium silty sand, what is the bearing stress imposed on the soil? Is this acceptable according to design values given in your Soil Design Values Handout? Concrete weight = 130 lb/ft^3 Soil weight - use saturated value 5.5 kip/f 2.5' 1 5

Answer 1

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For Medium (10kN 230), silty sand (SM), Saturated weight = 130 ft de Aclditional 20's, is added for eveory fl increase in cunchange. Allowable bearing ooo = 1000 lb/ft² additional bearing = 5 x 0,2X1000 - 1000 lblit >> Allowable Bearing = 1000+1000-2000.06144? Total load due to soil = 125x2.5x4 = 1250 lbs Total bead due to concrete = 130X2.5x5 +130 X2.5X1= 1950 lbs Impored load (consider unit with the inside) =5500 lbs. Bearing stress impored ococe @ 1250 +1950+5500 = 1740 Bli? The design is not acceptable. 5 becaur to allovable bearing > Bearing strey imposed. 2000 71740 Yes!