Bearing Capacity and Types of Failure PPT

Question 1

In order to avoid a bearing failure of the footing, in which the soil beneath the footing moves downward and outward from under the footing, __________. This limitation is provided by ensuring that the __________.

Answer 1

1. The service load stress under the footing must be limited.
2. Service load stress, qs, is less than or equal to an allowable bearing capacity, qa.

Question 2

Computation of Ultimate Load

Answer 2

qu = Pu / Af

Question 3

This type of failure is also referred to as Punching Shear Failure

Answer 3

Diagonal Tension Failure

Question 4

The footing fails due to the formation of inclined cracks around the perimeter of the column. Test results have indicated that the critical section can be taken at d/2 from the face of the column.

Answer 4

Diagonal Tension Failure

Question 5

Two Principal Kinds of Failure for Foundations

Answer 5

1. Structural Failure of the Foundation - bending, shear and bearing
2. Bearing Capacity Failure of the Supporting Soils - shear

Question 6

3 Types of Failure of Footings

Answer 6

1. Diagonal Tension Failure
2. One-way Shear Failure
3. Flexure Failure

Question 7

The footing fails due to the formation of inclined cracks that intercept that bottom of the slab at a distance d from the face of the column.

Answer 7

One way Failure

Question 8

For footings carrying columns with steel base plates, it is measured from a line halfway between the face of the column and the edge of the base plate.

Answer 8

Distance d