Situation: As shown in the Figure, an exterior column with a service dead load of 615 kN, as 1135 kN and a 925 795 kN and a service live load of well as an interior column with a service dead load of service live load of kN, must be supported on a combined rectangular footing whose outer end cannot protrude beyond the outer face of the exterior column. The soil's allowable bearing pressure is 325 kPa. The footing's bottom is 1.80 meters below grade, with a 4.8 kPa surcharge indicated on the surface. The footing is 1.20 meters thick. Concrete has a unit weight of 24 kN/m³, while soil has a unit weight of 18 kN/m³. The footing must be designed in such a way that the resulting pressure under service loads is uniform. a. Find the effective allowable bearing pressure in kPa (allowable pressure minus the weights of concrete, soil, and surcharge). b. Find the distance, in meters, of the point of application of the resultant service load of the two columns, measured from the outside face of the exterior column. C. Find the minimum dimensions in meters of the combined footing. L 450x600mm 600x600mm W 5.50 m
Situation: As shown in the Figure, an exterior column with a service dead load of 615 kN, as 1135 kN and a 925 795 kN and a service live load of well as an interior column with a service dead load of service live load of kN, must be supported on a combined rectangular footing whose outer end cannot protrude beyond the outer face of the exterior column. The soil's allowable bearing pressure is 325 kPa. The footing's bottom is 1.80 meters below grade, with a 4.8 kPa surcharge indicated on the surface. The footing is 1.20 meters thick. Concrete has a unit weight of 24 kN/m³, while soil has a unit weight of 18 kN/m³. The footing must be designed in such a way that the resulting pressure under service loads is uniform. a. Find the effective allowable bearing pressure in kPa (allowable pressure minus the weights of concrete, soil, and surcharge). b. Find the distance, in meters, of the point of application of the resultant service load of the two columns, measured from the outside face of the exterior column. C. Find the minimum dimensions in meters of the combined footing. L 450x600mm 600x600mm W 5.50 m
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Situation: As shown in the Figure, an exterior column with a service dead load of
615 kN, as
1135 kN and a
925
795 kN and a service live load of
well as an interior column with a service dead load of
service live load of
kN, must be supported on a combined
rectangular footing whose outer end cannot protrude beyond the outer face of the exterior
column. The soil's allowable bearing pressure is
325 kPa. The
footing's bottom is 1.80 meters below grade, with a 4.8 kPa surcharge indicated on the surface.
The footing is 1.20 meters thick. Concrete has a unit weight of 24 kN/m³, while soil has a unit
weight of 18 kN/m³. The footing must be designed in such a way that the resulting pressure
under service loads is uniform.
a.
Find the effective allowable bearing pressure in kPa (allowable pressure minus the
weights of concrete, soil, and surcharge).
b.
Find the distance, in meters, of the point of application of the resultant service load of
the two columns, measured from the outside face of the exterior column.
Find the minimum dimensions in meters of the combined footing.
c.
L
450x600mm
600x600mm
W
5.50 m
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