Truss (S78)

Tekla Structures
2021
Tekla Structures

Truss (S78)

Truss (S78) creates a truss between selected points. Truss (S78) does not create any connections to existing parts.

Objects created

  • Top chord

  • Bottom chord

  • Diagonals

  • Verticals between diagonals

  • Cap plates

Use for

Situation

Description

Truss with top chord, tilted bottom chord, cap plates, diagonals and verticals.

Truss with top chord, bottom chord, cap plates, diagonals and verticals.

Truss with top chord, bottom chord, cap plates, diagonals and verticals.

Selection order

  1. Pick the start point of the truss.

  2. Pick the end point of the truss.

    The truss is created automatically when the end point is picked.

Part identification key

Part

1

Top chord

2

Bottom chord

3

Vertical

4

Diagonal

Picture tab

Use the Picture tab to control the gap created between diagonals, the eccentricity of the diagonals, and the dimensions of the parts.

Gap dimensions

Description

Default

1

Gap between the diagonals at the top chord.

20 mm

2

Gap between the diagonals at the bottom chord.

20 mm

Eccentricity dimensions

Description

Default

1

Eccentricity of the diagonal intersection at the top chord.

20 mm

2

Eccentricity of the diagonal intersection at the bottom chord.

20 mm

Part dimensions

Description

Default

1

Define how the top and bottom chords are connected.

  • Apex haunch (106)

    Use with top and bottom chord I profiles.

  • Joining plates (14)

  • Welded

  • Continuous

    Creates a continuous top or bottom chord.

Welded

2

Select an attribute file for the connection.

standard

3

Horizontal distance between the start/end point of the truss and the first/last diagonal.

200 mm

4

Vertical distance between the start/end point of the truss and the bottom level of the bottom chord.

1000 mm

5

Top chord extension from the start/end point of the truss.

0 mm

6

Bottom chord extension from the first and the last diagonal/vertical to the chord end.

240 mm

7

Define how the chords, diagonals and verticals are connected.

  • Gusset plate (11)

  • Round tube (23)

    Used with round tube profiles.

  • Welded

Welded

8

Vertical distance between the truss apex and the bottom level of the bottom chord.

2000 mm

9

Horizontal distance between the top chord extension and the truss apex.

entire truss length/2

Parts tab

Use the Parts tab to control the profiles for chords, diagonals and verticals.

Profiles

You can define the profiles for the top and bottom chords, and up to seven profile types for the diagonals and verticals.

Use the Diagonals and the Verticals fields to define how the different profiles are created.

Option

Description

Default

Top Chord

Define the top chord profile by selecting it from the profile catalog.

CFRHS100*4

Bottom Chord

Define the bottom chord profile by selecting it from the profile catalog.

CFRHS100*4

Profile 1 -

Profile 7

Define a profile by selecting it from the profile catalog.

CFRHS80*4

Option

Description

Default

Pos_No

Prefix and start number for the part position number.

Some components have a second row of fields where you can enter the assembly position number.

The default part start number is defined in the Components settings in File menu > Settings > Options.

Material

Material grade.

The default material is defined in the Part material box in the Components settings in File menu > Settings > Options.

Name

Name that is shown in drawings and reports.

Class

Part class number.

Diagonals and verticals creation for left (1) and right (2) side

Options

Description

Diagonals

Define how the diagonals are created using the above profiles.

  • The diagonals are created by multiplying the number of diagonals with the type of profile, number*profile.

    For example, 2*3 creates two diagonals of the type Profile 3.

    For example, 1*2 is the same as 2, and creates one diagonal of the type Profile 2.

  • The number of diagonals results from the pattern. For example, 2 2*3 1 creates 4 diagonals.

  • The diagonals are created from the start/end point towards the truss center.

    If you have set the Truss type to Single pitch truss on the Parameters tab, the second Diagonals row is ignored. The diagonals are created from the start point to the end point of the truss.

Verticals

Define how verticals are created using the above profiles.

The verticals are positioned between the diagonals, and the maximum number of verticals results from the number of diagonals.

Twin profiles

Define whether the top or the bottom chord is created using twin profiles.

Top and bottom chord type

Option

Description

Short legs up

Default

Short legs down

Long legs up

Long legs down

Diagonal and vertical type

Option

Description

Short leg up

Default

Short leg down

Long leg up

Long leg down

Clearance

Define the gap between the twin profiles.

Parameters tab

Use the Parameters tab to control the truss assembly, and the diagonals and verticals creation.

Assembly main part

Define which part is the main part in the truss assembly.

  • Left Top Chord

    Additional welds are created between the truss and the left top chord.

  • Right Top Chord

    Additional welds are created between the truss and the right top chord.

  • Left Bottom Chord

    Additional welds are created between the truss and the left bottom chord.

  • Right Bottom Chord

    Additional welds are created between the truss and the right bottom chord.

  • None

    The assembly main part is controlled by the bolts/welds that the Truss (S78) creates and the connections used between the parts. If all bolts/welds are set to Site, then each part (top/bottom chords, verticals, diagonals) forms an individual assembly.

Verticals at truss end

Define whether a vertical is created to the truss ends.

Option for start point

Option for end point

Description

Default

No vertical is created to the end.

AutoDefaults can change this option.

No vertical is created to the end.

Vertical is created to the end.

Middle verticals

Define whether the verticals are created between diagonals.

Option

Description

Default

No middle verticals are created.

AutoDefaults can change this option.

No middle verticals are created.

Verticals are created between the diagonals.

Verticals are created between the diagonals. Verticals and diagonals form an N-type truss.

Extension for verticals and diagonals

Description

Default

1

Extension for diagonals and verticals in the top chord.

0 mm

2

Extension for diagonals and verticals in the bottom chord.

0 mm

Truss type

Option

Description

Default

Single pitch truss

AutoDefaults can change this option.

Single pitch truss

Top chord is horizontal. Bottom chord can be sloped.

Ridge truss

If the apex and the start/end point of the truss are of equal height, the chords are horizontal.

Upside-down ridge truss

If the apex and the start/end point of the truss are of equal height, the chords are horizontal.

Truss style

Option

Description

Default

WWW

AutoDefaults can change this option.

WWW

The first diagonal begins from the top chord.

AAA

The first diagonal begins from the bottom chord.

Cap plate tab

Use the Cap Plate tab to control the cap plate creation.

Connection 1002 properties for cap plate

Cap plates are created using the End plate detail (1002) component that has a given set of properties. You can name the properties sets.

Top and bottom chord cap plates

Define whether a cap plate is created.

Option for left side cap plates

Option for right side cap plates

Description

Default

No cap plate is created.

AutoDefaults can change this option.

No cap plate is created.

Cap plate is created.

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