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Question
Consider the following statements:
1. When the number of members (n) and joints (j) are such that the equation n = (2j – 3) is satisfied, the framed structure is said to be a perfect structure.
2. In a redundant frame, the number of members is less than that required for a perfect frame.
3. If, in a framed structure, the number of members provided is more than that required for a perfect frame, it is called as deficient frame.
Which of the above statements is/are correct?
A.
1, 2 and 3
B.
1 only
C.
2 only
D.
3 only
Answer ( Option B)

1 only

Solution

Perfect structure or frame are the one which can be analysed using the three conditions of static equilibrium. For these
m = 2j – 3
Redundant frame is a frame having more number of members than required such that there is always a member in which force can not be computed using equations of static equilbrium
n > (2j – 3)
Deficient frame is frame having less number of members than required for perfect frame
n < (2j – 3)

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