Forces in a Howe Truss Model MT 110

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.
Sci-tech Forces in a Howe Truss Model MT 110 setup provides experiments on single plane trusses with a high degree of measuring accuracy and computerised result readout based on software.

Item Description

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: Warren type.

Technical Specifications

1. Investigation of bar forces in a single plane, statically determinate truss
2. Ready assembled Howe truss
3. Frame for horizontal experimental setup

4. Influence of dead weight minimized by horizontal experimental setup
5. Any straight and inclined load cases possible
6. Fine adjustment of load force
7. Low-friction knife-edge bearing
8. 2 supports for vertical forces, 1 support for horizontal forces
9. Pre-balanced strain gauge connection box with connection to measuring amplifier FL 152
10. Measuring amplifier FL 152 required
11. Sci-tech-software optional 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°