Truses Audio

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Technical Training

Basics: What is truss


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Goal of this workshop

Share knowledge

Actively promote safe working practices

Provide product expertise for users


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Topics

What is truss

Different forces on Truss Analising loading of truss structures

Truss standards

Questions


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What is truss ?

Lattice structure

Made of(mainly) aluminium tubes

Low selfweight (easy to handle )

Modular(easy to transport)

Flexible (lego system)


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What is a lattice structure?

1. A lattice structureis an opentriangularstructure.

2. Triangular shapes

are stable inhingedconnections

3. Triangulation is

essential for


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Similarity between a lattice

structure and a Truss?


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The Truss

Main tube

Cross bracing bracing

End bracing

Coupling system Node point


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Advantages ofaluminium

+/- 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?


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Disadvantages ofaluminium

Strength decreases after welding with+/- 50%

Less stiff as steel

More difficult to weld

More expensive

Why is Truss made of(mainly)

alum

inium

?


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Main advantage of a Truss structure :

Low self weight in relation to a high load bearingcapacity.

Achieved by..

Bringing the material to the position where you

need it !!!!!


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Example.


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Different types ofcouplingsystems

Tube coupler

Gusset / Endplate

Hinge connection Male / Female

Conical coupler


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1: Tube connection

-Very high bearing stress in themain chord

-Open space between main

chord.


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2: Gusset / Endplate-Bending force in gusset Plate

-Open space between main chord


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3: Hinge connection Male / Female-Fixed Male/Female sides wear

given extra deflexion


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4: Conical coupler-Wear is compensated bij spigot

shape


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Mounting different brands oftruss together.

Although the truss looks the same each type of

truss has different technical specifications

Calculation of the system with different

specifications.

Responsibility


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Different forces on Truss

L

oading Forces

Internal reaction Forces


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Different types of loading

Point load

Multiple point load

Concentrated load

Uniformly distributed load

Cantilever load Normal force


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Point load


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Multiple point load


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Concentrated load


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Distributed load


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Cantilever load


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Normal Force


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Internal reaction forces in the Truss

Bending moment

Transversal forces ( also known as shear force )

Normal forcesTorsion force

The reaction of these forces is

Deflection


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This figure indicates where the internal

forces are active in the truss.

Shear force

Bending moment

Normal force

Normal force

Normal force


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Bending moment

To strain under tension, causing a straight

line structure to turn into a curve-shape


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Examples ofsituations when a bending moment

occurs:

Selfweight caused by the Force ofgravity Live loading such as lightning fixture orSound

equipment

Curtains, back drapes

Wind force.


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COMPR

SSION

TENSION

MOMENT

MOMEN

T

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