List two uses of the contragradient law in structural mechan

List two uses of the contragradient law in structural mechanics:

Solution

The contragredient law is based upon the principle of virtual displacements. Following are the two uses of contragredient law.

1. It is used to find the deflections of the structures.

2. Used to establish the joint (trusses) equilibrium equations, and thus used for the analysis of trusses.