A ground investigation report shows that the foundation of a proposed structure is to be founded at 1.2m below the surface of a saturated clay, and laboratory tests conducted on representative samples established the following soil parameters; Pu = 0°, cu = 24 kPa; Ø' = 25°, and c' = 0. The unit weight of the clay is 20 kN/m³. Assuming a square footing has been proposed, and the footing is expected to support a concrete column with dimensions of 0.35m x 0.35m x 4.1m, carrying an axial load of 88P kN excluding self-weight. Where P = 8. Take unit weight of concrete as 24 kN/m³. Propose a suitable foundation size for the following conditions; %3D (a) Immediately after construction (short term condition)

A ground investigation report shows that the foundation of a proposed structure is to be founded at 1.2m below the surface of a saturated clay, and laboratory tests conducted on representative samples established the following soil parameters; Pu = 0°, cu = 24 kPa; Ø' = 25°, and c' = 0. The unit weight of the clay is 20 kN/m³. Assuming a square footing has been proposed, and the footing is expected to support a concrete column with dimensions of 0.35m x 0.35m x 4.1m, carrying an axial load of 88P kN excluding self-weight. Where P = 8. Take unit weight of concrete as 24 kN/m³. Propose a suitable foundation size for the following conditions; %3D (a) Immediately after construction (short term condition)

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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Question

A ground investigation report shows that the foundation of a proposed structure is to
be founded at 1.2m below the surface of a saturated clay, and laboratory tests
conducted on representative samples established the following soil parameters; pu
= 0°, cu = 24 kPa; ' = 25°, and c' = 0. The unit weight of the clay is 20 kN/m³. Assuming
a square footing has been proposed, and the footing is expected to support a concrete
column with dimensions of 0.35m x 0.35m x 4.1m, carrying an axial load of 88P kN
excluding self-weight. Where P = 8. Take unit weight of concrete as 24 kN/m³.
Propose a suitable foundation size for the following conditions;
(a) Immediately after construction (short term condition)
(b) Some years after construction (long term condition)
Use Terzaghi's bearing capacity theory, and take the factor of safety for bearing
capacity as 3.0. Assume a foundation slab thickness of 0.3m. Table Q1 shows bearing
capacity factors for general failure mode.

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