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Products  |  Engineering Mechanics and Machine Elements  |  Statics  |  SE 110.21
SE 110.21 Forces in Various Single Plane Trusses Show data sheet (pdf file) Print page
Technical Description

The object of the experiment is to measure the bar forces in a single plane truss subjected to a single external force.
  The SE 110.21 experimental set-up features bars with special snap-lock closures on their ends allowing them to be fixed easily into the node disc. The range of different bar lengths provided permits three forms of truss to be constructed.
  The bars are hinged, joined together by node discs, 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 disc generates an external force. All the forces on the truss bars are recorded by means of strain gauges.

  Computerised evaluation is provided by measurement amplifier FL 151 (16 input channels). If there are more than 16 measuring points, the measurement amplifier can be extended by a measuring point add-on unit (FL 151.01) to 32 input channels. The software is used to manage the measurement data and provide graphical representation of the bar forces. The software features a comprehensive help function.

  The various elements of the experiment are clearly laid-out and housed

securely in a storage system. The complete experimental set-up is arranged in the frame SE 112.
  The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.


Learning Objectives / Experiments

- Measurement of the bar forces in various single

  plane trusses
- Dependency on the external force
  * magnitude
  * direction
  * point of application
- Comparison of measurement results with

  mathematical methods
  * method of joints
  * Ritter’s method of sections


- Basic principle: measurement of forces using

  strain gauges


* Measurement of the bar forces in a single plane

* Construction of various truss forms1
* Bars with strain gauge full bridges to measure

  bar force1
* Computerised evaluation of experiments

Available accessories
FL 151 -- Multi-Channel Measurement Amplifier
SE 112 -- Mounting Frame
Alternative products
FL 111 -- Forces in a Simple Bar Structure
SE 110.22 -- Forces in an Overdeterminate Truss
SE 110.44 -- Deformation of Trusses
SE 130 -- Forces in a Howe Truss

[1] Investigation of bar forces in a statically determinate truss
[2] Construction of various trusses possible
[3] 2 supports with node discs
[4] Load application device with force gauge mountable on different node discs
[5] Strain gauge to measure force on each bar
[6] Measurement amplifier FL 151 required
[7] Software to evaluate measurement data
[8] Storage system to house the components
[9] Experimental set-up in frame SE 112


Technical Data

Bars: 19
- 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
- strain gauge on each bar
- height of truss max. 450mm
- length of truss max. 900mm
Load application device

- 500...+500N

- graduations: 10N


Dimensions and Weight
Weight: approx. 14 kg
Scope of Delivery
1 set of bars
5 node discs
2 supports with node disc
1 load application device
1 set of cables
1 storage system
1 software CD
1 set of instructional material
Order Details

022.11021  SE 110.21  Forces in Various Single

                     Plane Trusses

© 2005 G.U.N.T. Gerätebau GmbH