measurement of bar forces on a single plane truss, Howe type
- 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 SE 130setup provides experiments on single plane trusses with a high degree of measuring accuracy and computerised result readout based on software.
- The ready assembled truss is mounted horizontally on a frame.
- The influence of the dead weight is minimized by horizontal experimental setup.
- The bars are joined by a “hinged” connection, using node disks.
- Consequently, our truss can be considered as an ideal truss.
- The external force is generated with the aid of a threaded spindle.
- The force can be applied in various directions and at various points.
- The forces occurring on the truss bars are recorded by strain gauge measurement.
- All measuring points are housed together in a connection box.
- From there, they are connected to the measuring amplifier FL 152.
- The software is used to manage the measuring data and provide graphical representation of the bar forces.
- The software features a comprehensive help function.
- An additional truss is available to extend the scope of the experiment: SE 130.01, Warren type.
- investigation of bar forces in a single plane, statically determinate truss
- ready assembled Howe truss
- frame for horizontal experimental setup
- influence of dead weight minimized by horizontal experimental setup
- any straight and inclined load cases possible
- fine adjustment of load force
- low-friction knife-edge bearing
- 2 supports for vertical forces, 1 support for horizontal forces
- pre-balanced strain gauge connection box with connection to measuring amplifier FL 152
- measuring amplifier FL 152 required
- GUNT-software in FL 152 to evaluate measured values graphically
Truss: Howe type
- bar cross-section: 10x3mm, stainless steel
- bar lengths: 115,5, 200, 231mm
- external loading: max. 500N
- bars: 13, of which 7 with measuring points
Load application device with force gauge
- tensile force: max. 600N
- stroke: 30mm
Node disks: 8
Angle between bars: 30°, 45°
Dimensions & Weight:
- L x W x H: 1220x620x250mm (frame)
- L x W x H: 850x265x15mm (Howe truss)
- Weight: approx. 43kg
- measurement of the bar forces in a single plane truss, Howe type
- dependency of bar forces on the external force
- magnitude, direction, point of application
- comparison of measuring results with mathematical and graphical methods
- method of joints
- Ritter’s method of sections
- Cremona diagram
- basic principle: measurement of forces using strain gauge measurement
Scope of delivery:
- 1 frame
- 1 Howe truss
- 1 load application device
- 1 strain gauge connection box
- 1 ribbon cable
- 1 set of instructional material
- measurement of bar forces by strain gauge measurement
- external load may be applied at different angles
· Required: FL 152 multi-channel measuring amplifier
– WP 300.09 Laboratory trolley
– SE 130.01 Truss beam: Warren girder
Due to the continuous development of our products, the goods supplied may vary in detail to that illustrated on this Website.