1. Technical Training Basics: What is truss

6. Goal of this workshop Share knowledge Actively promote safe working practices Provide product expertise for users

7. Topics What is truss Different forces on Truss Analising loading of truss structures Truss standards Questions

8. What is truss ? Lattice structure Made of (mainly) aluminium tubes Low self weight (easy to handle ) Modular (easy to transport) Flexible (lego system)

13. What is a lattice structure? 1.A lattice structure is an open triangular structure. 2.Triangular shapes are stable in hinged connections 3.Triangulation is essential for strength and stability

14. Similarity between a lattice structure and a Truss?

15. The Truss Main tube Cross bracingbracing End bracing Coupling systemNode point

16. Advantages of aluminium +/- 1/3 of the weight of steel Non corrosive Available in large quantities Easy to machine Allowable stress for tension and compression is the same Why is Truss made of (mainly) aluminium?

17. Disadvantages of aluminium Strength decreases after welding with +/- 50% Less stiff as steel More difficult to weld More expensive Why is Truss made of (mainly) aluminium?

18. Main advantage of a Truss structure : Low self weight in relation to a high load bearing capacity. Achieved by.. Bringing the material to the position where you need it !!!!!

19. Example.

20. Different type’s of coupling systems Tube coupler Gusset / Endplate Hinge connection Male / Female Conical coupler

21. 1: Tube connection -Very high bearing stress in the main chord -Open space between main chord.

22. 2: Gusset / Endplate -Bending force in gusset Plate -Open space between main chord

23. 3: Hinge connection Male / Female -Fixed Male/Female sides wear given extra deflexion

24. 4: Conical coupler -Wear is compensated bij spigot shape

25. Mounting different brands of truss together. Although the truss looks the same each type of truss has different technical specifications Calculation of the system with different specifications. Responsibility

26. Different forces on Truss Loading Forces Internal reaction Forces

27. Different type’s of loading Point load Multiple point load Concentrated load Uniformly distributed load Cantilever load Normal force

28. Point load

29. Multiple point load

30. Concentrated load

31. Distributed load

32. Cantilever load

33. Normal Force

34. Internal reaction forces in the Truss Bending moment Transversal forces ( also known as shear force ) Normal forces Torsion force The reaction of these forces is Deflection

35. This figure indicates where the internal forces are active in the truss. Shear force Bending moment Normal force

36. Bending moment To strain under tension, causing a straight line structure to turn into a curve-shape

37. Examples of situations when a bending moment occurs: Self weight caused by the Force of gravity Live loading such as lightning fixture or Sound equipment Curtains, back drapes Wind force.