This training unit is used to investigate loaded plane trusses and enables the member forces to be measured. A pre-assembled main truss is included. The trusses are assembled using joint discs to avoid bending loading. Seven of the members are equipped with full bridge strain gauges for the measurement of force. A strain gauge connecting box is included in which the offset error of the individual strain gauges is already compensated. The measuring amplifier FL 151 is required for measured signal conditioning. The loading device is mounted in bearings such that it can rotate, as a result it is also possible to apply forces at an angle. The unit is designed as an easy to operate table model. Another truss is available as an accessory, a laboratory trolley for storing the individual parts is also available.
Learning Objectives / Experiments
- Forces in a Howe main framework truss + weight loading on top + wind loading normal to the top surface - Measurement and comparison of the member
forces, checking using different methods (joint
sectioning method, Ritter's sectioning method,
Cremona's polygon of forces)
Features
* Completely assembled truss with precompensated
full bridge strain gauges1 * Knife-edge bearings for minimisation of friction1 * Unsymmetrical and slanted loading can be generated
using special loading device1 * Sturdy frame made of powder coated rectangular
[1] Table experiment for investigating the deformation of loaded plane trusses [2] Pre-assembled Howe type truss girder made of 8 joint discs and 13 truss members [3] Pre-compensated strain gauge connecting box [4] Loading with ring dynamometer [5] Unsymmetrical and slanted loading as required is possible [6] Knife-edge bearings for minimisation of friction [7] Truss mounted horizontally to minimise the influence of own weight [8] Sturdy frame made of coated rectangular tube
