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Examples. Hollow Section Trusses Design Procedure. Wardenier “Tubular Structures Course”. Truss Design Procedure. Determine truss layout, span, depth, panel lengths, truss spacing by usual methods. Keep connections to a minimum.

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Presentation Transcript
slide1

Examples

Hollow Section Trusses

Design Procedure

Wardenier “Tubular Structures Course”

slide2

Truss Design Procedure

Determine truss layout, span, depth, panel lengths, truss spacing by usual methods.Keep connections to a minimum.

Determine loads at connections and on members.Simplify these initially to equivalent loads at panel points.

Determine axial forces in all membersby assuming that joints are pinned and assume all member centre lines are noding.

1.

2.

3.

Wardenier “Tubular Structures Course”

slide3

Determine chord member sizes considering:

4.

Axial load

Corrosion protection (surface area)

Wall slenderness

Truss Design Procedure

Wardenier “Tubular Structures Course”

slide4

5. Determine web member sizes considering:

Axial load

tweb < tchord

K = 0.75 for compression webs

6. Standardize the brace member sizes:

e.g. to 2 or 3 sizes

Same width, different thickness? Inspection problem

Check availability!

7. Layout connections:

Try gap connections first

Check connection geometry is within validity range

Check member sizes are within validity range

Pay attention to eccentricity limits

Consider fabrication procedure

Truss Design Procedure

Wardenier “Tubular Structures Course”

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Truss Design Procedure

8. Check connection efficiencies

(with charts)or resistances(with formulae or tables)

Usually only a few connections need to be checked.

If efficiencies or resistances are not adequate, modify the connection layout

(e.g. overlap instead of gap), or

Modify the members;

Re-check connections.

9.

Wardenier “Tubular Structures Course”

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Truss Design Procedure

10.

Check effect of primary moments on chord design.

Use proper load positions on members

Determine member bending moments assuming:

Pinned joints everywhere or

Continuous chords with pin-ended webs

For compression chord, also consider noding

eccentricity moment.

Check member (axial and bending) interactions.

11.

Check truss deflections under specified loads.

Design welded joints.

Fillet welding cheapest

12.

(Note: Weld Design can be left to the fabricator but not connection verification)

Wardenier “Tubular Structures Course”

slide7

Some Golden Rules to Avoid Connection Problems

General Tips

for

Designers

Wardenier “Tubular Structures Course”

slide8

Overlap

Joints

or

braces

Gap Joints

Deflections of Trusses

Check Deflections Under Specified Loads

or

Wardenier “Tubular Structures Course”

slide9

Design Example of Design Guide 1

Wardenier “Tubular Structures Course”

slide10

CHS K joint

Wardenier “Tubular Structures Course”

slide11

Efficiency

CHS

K joint

Wardenier “Tubular Structures Course”

slide12

Effect Chord

Pre-stress

Wardenier “Tubular Structures Course”

slide15

Note: Gap of joint 2 is decreased to satisfy joint strength and

the eccentricity is taken into account for the member check

Wardenier “Tubular Structures Course”

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Design Example of Design Guide 3

Wardenier “Tubular Structures Course”

slide18

RHS K joint

Wardenier “Tubular Structures Course”

slide20

Efficiency

RHS

K joint

Wardenier “Tubular Structures Course”

slide21

Effect Chord

stress

Wardenier “Tubular Structures Course”