A combined rectangular footing is composed of exterior column 450 mm x 600 mm and interior column 600 mm x 600 mm. The 600 mm face of the exterior column coincides the edge of the footing .The depth of the footing is 1.2 m and the bottom of the footing is 1.8 m below the ground. The exterior column carries a service liveload of 510 kN and a service deadload of 790 kN while the interior column carries a service liveload of 820 kN and a service dead load of 1100 kN. Unit weight of soil is 18 kN/m³. Allowable soil pressure is 290 kPa and an additional surcharge of 4.8 kPa placed on the ground surface. Center to center distance of column is 5.5 m. Effective soil pressure at the bottom of the footing is the allowable soil pressure minus the surcharge, pressure due to soil and pressure due to footing. 1. Which of the following most nearly gives the effective soil pressure? a. 265 kPa b. 271.52 kPa c. 245 kPa d. 255.23 kPa 2. Which of the following most nearly gives the location of the resultant of the service loads from the exterior edge of the column? a. 3.0 m b. 2.5 m c. 3.5 m d. 4.0 m 3. Which of the following most nearly gives the dimension of the footing? a. 3.5 m x 7 m b. 2 m x 7 m c. 3 m x 7 m d. 2.5 m x 7 m

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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A combined rectangular footing is composed of exterior column 450 mm x 600 mm and interior column 600 mm x 600 mm. The 600 mm face of the exterior column coincides the edge of the footing .The depth of the footing is 1.2 m and the bottom of the footing is 1.8 m below the ground. The exterior column carries a service liveload of 510 kN and a service deadload of 790 kN while the interior column carries a service liveload of 820 kN and a service dead load of 1100 kN. Unit weight of soil is 18 kN/m³. Allowable soil pressure is 290 kPa and an additional surcharge of 4.8 kPa placed on the ground surface. Center to center distance of column is 5.5 m. Effective soil pressure at the bottom of the footing is the allowable soil pressure minus the surcharge, pressure due to soil and pressure due to footing.

1. Which of the following most nearly gives the effective soil pressure?

a. 265 kPa

b. 271.52 kPa

c. 245 kPa

d. 255.23 kPa

2. Which of the following most nearly gives the location of the resultant of the service loads from the exterior edge of the column?

a. 3.0 m

b. 2.5 m

c. 3.5 m

d. 4.0 m

3. Which of the following most nearly gives the dimension of the footing?

a. 3.5 m x 7 m

b. 2 m x 7 m

c. 3 m x 7 m

d. 2.5 m x 7 m

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