Redundant Truss

Description of Redundant Truss

The 45° two bay truss consists of seven members with pinned joints cantilevered from the vertical member of the Universal Frame and Stand using an upper springing and supported by a roller bearing on a vertical track at the lower springing. An extra diagonal member with its length adjustable by a simple mechanism is provided to make the first bay of the Redundant Truss. Each Redundant Truss member incorporates a strain gauge bridge arrangement for direct measurement of strain. Load is applied to the truss by a screw jack mechanism with integral load cell.

Experimental Capabilities of Redundant Truss

1. To measure the strain and deflection in the individual members of a truly pin jointed truss when a redundant member is added
2. Comparison of experimental forces with theoretical values
3. View and record the effect of lack of fit of the redundant member into the truss
4. Study of deflection of a truss with and without redundancy
5. Study of strains, forces and deflections in a determinate and indeterminate framework

Specification of Redundant Truss

1. To be constructed of a 45° two bay cantilevered Redundant Truss with seven members and pinned joints
2. To include an extra (redundant) member with a simple means of adjusting its length into the Redundant Truss
3. Vertical and horizontal members 400mm centres
4. Strain gauge technology used on each truss member
5. Loaded by an accurate screwjack mechanism with integral load cell
6. Deflection measured using digital deflection indicator with connecting lead
7. Must be used with universal Frame and Stand
8. Must be used with Interface
9. Comprehensive instruction manual provided