Jeen de Vries is Marketing Communications and Graphic Design at Prolyte Group.Other blogs by Jeen de Vries
Prolyte Campus on Truss loading
Last week Prolyte organised yet another Prolyte Campus event in Emsdetten, Germany. This event was dedicated to truss loading and load capacity.
Reading and understanding the loading tables is one thing, but when you link that with commonplace daily practice, it normally gets more complex. Prolyte training veteran Matthias Moeller is well suited to bring this complex matter in a way that is both exciting and fun to experience, at the same time getting the key points across.
The loading capacity of trusses is specified by all manufacturers as the structural system of a simply supported beam. Few producers also provide the maximum permissible forces, which are needed for the calculation of multi-span beams and truss structures.
With the introduction of Eurocode, we see a serious change for structural analyses which makes it impossible to give an indication of the maximum allowable physical quantities.
In addition to an extensive examination of new design methods, different load situations are explained.
A practical load test during the training made the limits visual in a testing situation – and it is also a lot of fun to do! For this test a 10 m. Span of Prolyte X30V truss was tested, with the support points at exactly 10m. The allowable CPL for this type of truss, with this span is 410kg. The truss failed at 3,4 times it’s CPL. As you can see clearly in the video the top chords show buckling, due to the compression force.
Gear used for this test:
- Load Cell: ME-Sensors, 50KN, Sampling frequency f=10Hz (10 measurements per second)
- Electric Chain hoist: ProLyft Aetos 2 tonne
- Test weight: concrete block of 2 tonne