Experiment for the study of strains, stresses, forces and defl ections in various pin jointed frameworks, and the study of Bow’s notation. Mounts on the Structures platform and connects to Structures automatic data acquisition unit and software (VDAS® Onboard).
Key Features
• One of a range of experiment modules that teach structures principles
• Fits to the Structures platform for ergonomic use and space-saving storage
• Interchangeable square section structural members to allow easy construction of four diff erent frameworks
• Strain gauge amplifi er and multiple strain gauges for measurement of force in each member of the trusses
• Simplifi ed versions of realistic structures to give students an understanding of real-life structures
• Additional load cell available for multiple experiments
• Supplied with storage trays to keep members and smaller items safe
• Works with user-friendly software (VDAS®)
Description
One of a range of experiment modules that fi t to the Structures platform (STS1, available separately), this product helps students to understand the forces and defl ections in four popular pin-jointed frameworks, due to a load. Students use a load cell to measure and add loads to each of a choice of four frameworks, held on supports. Strain gauges on each member of the framework measure the forces due to the load. A precision digital indicator measures the defl ection of each framework.
Students apply the load and measure the resulting forces and defl ection. They use textbook equations to predict the forces and defl ections for any given load, comparing them to measured results. This helps confi rm the reliability of the textbook equations and the accuracy of the experiment results. An optional load cell (STS8a) allows students to add a secondary load to the side of the roof truss. Each load cell can apply angled loads for additional experiments or to simulate a swaying load.
The strain gauges connect to a strain gauge amplifi er, which connects (with the load cell) to the USB interface hub of the Structures platform for computer display and data acquisition (VDAS® Onboard).
Learning outcomes
• Introduction to Bow’s notation
• Strain gauges as instruments
• Forces and defl ections in diff erent frameworks
• The Warren truss
• The roof truss (or Howe/Pratt truss)
• Simple and advanced cantilever trusses
• Force analysis by method of joints and method of sections
• Defl ection analysis by the strain-energy method
• Wind loads on a roof truss
• Aff ect of a swaying load on a cantilever truss
• The principle of superposition for multiple loads (needs additional load cell)
Essential Ancillary
• Structures Platform (STS1)
