Question

8: The governing compressive stress in a
concrete gravity dam which should not be
allowed to exceed the permissible value
of about 3000 KN/m2 while analyzing full
reservoir case is what
​

Answer 1

Q. The governing compressive stress in a concrete gravity dam which should not be allowed to exceed the permissible value of about 3000 KN/m2 while analyzing a full reservoir case is ____________________

a) the maximum vertical stress at the toe

b) the major principal stress at the toe

c) the shear stress at the toe

d) the principal stress at the heel

The governing compressive stress in a concrete gravity dam which should not be allowed to exceed the permissible value of about 3000 KN/m2 while analyzing the full reservoir case is the major principal stress at the toe

A correct answer is option (b) the major principal stress at the toe

• The principal stress is the stress acting on the main level. The plane with maximum normal stress is called The main level and the tension acting on it is called major stress.

• For a full reservoir, the resultant force is close to the toe, causing the greatest compressive stress at the toe. The vertical direct stress distribution at the base is the sum of the direct and bending stresses and is given by – Pmax = V/B [1 + 6e/B]

• Pmax = V/B [1 + 6e/B] where V is the vertical total force, e is the eccentricity of the resultant force from the center of the base, and B is the width of the base.

Answer 2

Answer:

The governing compressive stress in a

a. concrete gravity dam which should not be

b. allowed to exceed the permissible value

c. of about 3000 KN/m2 while analyzing full

d. reservoir case is what

​Explanation:

The governing compressive stress in a concrete gravity dam which should not be allowed to exceed the permissible value of about 3000 KN/m2 while analyzing the full reservoir case is the major principal stress at the toe

A correct answer is option (b) the major principal stress at the toe

The stress acting on such plane is the major principal stress Pmax. All the stresses can be represented by Mohr’s circle.

For the member subjected to the biaxial stresses, the two principal stresses are as follows:- Maximum principal stress or major principal stress is the maximum value of normal stress acting on one of the principal planes where the value of shear stress is zero.

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