STR17 - Experiment

REDUNDANT TRUSS

An experimental apparatus to allow students to investigate the principles of redundancy and aspects of safety critical structures using determinate and indeterminate framed structures.

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Description

REDUNDANT TRUSS

The experiment hardware fits onto a Structures Test Frame (STR1, available separately). Two supports hold the top and base of one side of a structure. The top support allows pivoting, the base support allows pivoting and rolling. Initially, one of the members is missing from the structure, making it determinate. To make the structure indeterminate, students refit the missing member. Students manually apply a load to one end of the determinate framework using a screw-thread and electronic load cell. The load cell connects to a Digital Force Display (STR1a, available separately) which shows the applied load.

Each member of the structure has strain gauges attached. These each connect to a digital strain bridge which shows the member strains. Students use the strains to help them calculate the forces in the structure. A digital deflection indicator measures displacement in the structure. Students note applied load, strains and deflection in a determinate framework. They then repeat the experiment with the frame made indeterminate, and analyse and compare their results.

The lecturer guide provides details of the equipment including sample experiment results. The student guide describes how to use the equipment and gives experiment procedures.

For extra ‘virtual’ experiments, TecQuipment can supply the optional TecQuipment Structures Software (STRS), for use on a suitable computer. The virtual experiments simulate the tests you can perform with the hardware. They also extend the choice of tests beyond that available using only the hardware, for example: higher loads, uniform loads or different test specimens. This extends the student’s learning experience.

For automatic data acquisition of your experiment results, TecQuipment can supply the optional Automatic Data Acquisition Unit (STR2000). Supplied as standard with the STR2000 is TecQuipment’s Structures Software that displays and logs your experiment results and gives the extra virtual experiments.

Learning outcomes

Study of strains, stresses, forces and deflections in a:

  • Statically determinate structure
  • Statically indeterminate structure
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Essential Base Units
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