**What is a truss or frame? How can we classify trusses based on number of members in a frame? What is a deficient and redundant frame?**
A truss or frame may be defined as a structure, made up of several bars, riveted or welded together. These are made up of angle irons or channel sections and are called members of the frame or framed structure. The frames may be classified into the following two groups:

1. Perfect frame, and

2. Imperfect frame.

A

where

n = Number of members, and

j = Number of joints.

An

1. Perfect frame, and

2. Imperfect frame.

A

*is that which is composed of members just sufficient to keep it in equilibrium, when loaded, without any change in its shape. A perfect frame should satisfy the following expression:***perfect frame****n = 2j-3**where

n = Number of members, and

j = Number of joints.

An

**is one which does not satisfy the above equation (n = 2j — 3). The imperfect frame which has number of members (n) less than 2j - 3, is known as***imperfect frame**. If the number of members are greater than 2j - 3, Then the imperfect frame is known***deficient frame***.***redundant frame**
Thank u very much for your help.

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