# Types of deficient truss

Q.  Identify the type of truss shown below.
- Published on 18 Sep 15

a. Deficient truss
b. Perfect truss
c. Redundant truss
d. All of the above

#### Discussion

• Roshani   -Posted on 27 Apr 17
no of joints = 4
no of members (m) = 4
no of reactions = 3
2j-r = 2*4-3 = 5
so, m < 2j-r
Thus, deficient truss.
• Mathankumar   -Posted on 08 Jul 16
How to got solution for (2 * 4 ) - 3 = 9........?
• Sravanthi   -Posted on 16 Dec 15
- In diagram shown above, the number of joints (j) are 4.

- Number of members (n) are 6 and the reaction components are 3.

- The condition for redundant truss is n > 2j – R

Here, 6 less than 9. Hence , the condition is not satisfied.

- The condition for deficient truss is n < 2j – R

here 6 < (2 x 4) - 3

6 < 9

For deficient truss, the condition is satisfied. Hence it is a deficient truss.

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