measurement of the bar forces in a single plane truss
- As light-weight structures offering a high degree of rigidity, trusses are employed in the construction of halls, bridges, cranes, pylons and masts.
- Trusses are bar structures in which the bars are subjected to compression or tension loading, but not to bending.
- The object of the experiment is to measure the bar forces in a single plane truss subjected to a single external force.
- The SE 110.21experimental setup features bars with special snap-lock closures on their ends allowing them to be fixed easily into the node disk.
- The range of different bar lengths provided permits three statically determinates truss to be constructed.
- The bars are hinged, joined together by node disks, and are subjected only to compressive or tensile stress.
- No moments are transmitted in the nodes; they can be regarded as frictionless.
- Consequently, our trusses can be considered as ideal trusses.
- A load application device attached to a node disk generates an external force.
- All the forces on the truss bars are recorded by means of strain gauge measurement.
- Computerised evaluation of the measured values is provided by measuring amplifier FL 152(16 input channels).
- The software in FL 152is used to manage the measured data and provide graphical representation of the bar forces.
- The software features a comprehensive help function.
- All the component elements of the experiment are clearly laid-out and housed securely in a storage system.
- The complete experimental setup is arranged in the frame SE 112.
- investigation of bar forces in a statically determinate truss
- construction of various trusses possible
- 2 supports with node disks
- load application device with force gauge mountable on different node disks
- measuring points to measure force on each bar
- measuring amplifier FL 152 required
- GUNT-software in FL 152 to evaluate measured values graphically
- storage system to house the components
- experimental setup in frame SE 112
- 2 bars 150mm
- 5 bars 259mm
- 7 bars 300mm
- 1 bar 397mm
- 3 bars 424mm
- 1 bar 520mm
- angle between bars: 30°, 45°, 60°, 90°
- maximum bar force: 500N
- measuring points on each bar
- height of truss max. 450mm
- length of truss max. 900mm
Load application device:
- graduation: 10N
Dimensions & Weight:
- L x W x H: 1170x480x178mm (storage system)
- Weight: approx. 26kg (total)
- measurement of the bar forces in various single plane trusses
- dependency of the bar forces on the external force
- point of application
- comparison of measuring results with mathematical methods
- method of joints
- Ritter’s method of sections
- basic principle: measurement of forces using strain gauge measurement
Scope of delivery:
- 1 set of bars
- 5 node disks
- 2 supports with node disk
- 1 load application device
- 1 set of cables
- 1 storage system with foam inlay
- 1 set of instructional material
- construction of various truss forms
- bars with strain gauge measurement to measure bar force
· FL 152 multi-channel measuring amplifier
· SE 112 Mounting frame
Due to the continuous development of our products, the goods supplied may vary in detail to that illustrated on this Website.