Question

Consider the following statements:

1. Muller-Breslau's principle is applicable only to indeterminate structures.

2. Muller-Breslau's principle is applicable only to determinate structures.

3. Muller-Breslau's principle is applicable to determinate and indeterminate structures.

4. For a two span continuous beam ABC, the influence line diagrams is/are





Which of these statements are correct?

• A. 3 and 4 (i)
• B. 1 and 4 (ii)
• C. 2 and 4 (i)
• D. 3 and 4 (ii)

Answer 1

The correct option is A 3 and 4 (i)

Muller Breslau's principle can be applied to both determinate and indeterminate structure. So both 1 and 2 are wrong and 3 is correct.

For ILD of $R_A$ give unit deflection in the direction of $R_A$ and the deflection shape will given the ILD.



Thus there is no reaction at A when the load is either at B or C, while the given diagram in 4(i) shows some value of $R_A$ when load is at C. So it is incorrect.

And ILD for $R_B$ is