This apparatus is used to measure the deformation in elements of simple bar structure. Whenever a load is applied to a simple bar structure, its members undergo a strain.
This unit consists of a base structure which provides the support locations for the truss. Three metallic elements form a truss in a triangular shape. Load is applied from the top of the truss structure via a hanger. Each member has a force gauge connected to it which shows the forces produced due to applied load in each member.
This apparatus represents a simple roof truss bar structure.