Hollow Core Definitions

Last modified by superadmin on 2021/05/04 17:17

To be able to draw Hollow Cores, one need to create definitions to use.

Preparation

Before starting to create the definition in IMPACT, one needs to prepare the section, cores, and strands. This is usually done by using the Hollow Core sections provided by the manufacturer of the production lines. 

Start with copy the section to an empty IMPACT Drawing. Before doing anything, it is good to use AutoCAD command Explode on the section. This prevents different problems when defining the section. 

The next step is to join the lines into polylines. This can be done with AutoCAD command Boundary, as can be seen in Figure 1 below. The command will create one polyline for each set of lines that are somehow "closed". For a Hollow Core, the section and cores will convert to polylines. 

prep_1.gif

Figure 1: Converting the section into polylines with AutoCAD command Boundary

The next step is to make sure that there are no lines hidden under the newly created polylines. 

prep_2.gif

Figure 2: make sure that there are no lines hidden under the newly created polylines

The last step in the preparation is to change the symbols for the strands into blocks used by IMPACT. This is because IMPACT will read the name of the blocks for the strands. The blocks that will be used can be found in the Standard folder \Standard\1100\1100\templates_drawings. The name of the blocks is _uStrandSymbol. 

u_Strand.png

Figure 3: _uStrandSymbol

prep_3.gif

Figure 4: Replace strand symbols

Define Hollow Core

Start with launching the command Hollow Core Definitions.

hc_cmd.png

Figure 5: Hollow Core Definitions

Create a new definition at any level.

new_hc.png

Figure 6: Create a new Hollow Core definition

The next step is to use the prepared section to create the definition. To get the information, use the functionality Select Objects

get_section.gif

Figure 7: Getting the geometry, cores and strand positions with Select objects

When using this functionality, one will get two questions: 

  1. Get cores from the section? 
  2. Get strand positions from the section? 

If answering "Yes" to these questions, one will get all the required information for the definition. If answering "No", one needs to specify this information manually in the Cores and Strands tabs. 

general_1.png

Fígure 8: Hollow Core Definition General tab

  1. Section preview
  2. Height
  3. Width (incl. tol.) - actual element width plus the tolerance
  4. Tolerance - the distance between the actual element and the element boundary 

tol.png

  1. Diff. bottom top

diff.png

  1. Endcap - default endcap for the definition 
  2. Material
  3. Production line 
  4. Section geometry - geometry of the hollow core section

Under the Cores tab, one can add information about the cores. Since answering "Yes" when selection the objects above, this information is already specified. 

cores2.png

Fígure 9: Hollow Core Definition Cores tab

Under Cutting tab, one can specify preferred zones for cutting the section. If the user will specify the width of an element manually so that the cut will be placed outside the preferred zones for cutting, IMPACT will warn the user that the cut will be outside the cutting zone. 

To define the zones, one can either draw some rectangles over the section and use those as help for defining the zones "Select Cut Zones" (see Figure 10), or specify the positions in the dialog (see Figure 11 point 13). 

cutting.gif

Figure 10: Select cut zones

cutting_2.png

Fígure 11: Hollow Core Definition Cutting tab

  1. Section preview - the green rectangles show the preferred cutting zones
  2. Cutting method - 
  3. Use nearest cut zone when cutting elements -
  4. Preferred zones for cutting section

strands.png

Fígure 12: Hollow Core Definition Strands tab

  1. Strand groups - different groups for different strands
  2. Strand positions - added manually or automatically by using Select Strands in the section preview area

strandpat.png

Fígure 13: Hollow Core Definition Strandpatterns tab

  1. Strandpatterns - one definition can have several strand patterns. Here the user adds a new strand pattern and specifies which strands that should be included by thickening the boxes in Strand positions (18 in Figure 13). Here one can also specify which strandpattern that should be the default one
  2. Strand group properties - diameter, steel quality and prestress value for the different Strand groups
  3. Strand Positions - select which strands that should be included in a strand group by thickening the boxes for each strand. The strands that are selected will be shown as green in the section preview

lifting.png

Fígure 14: Hollow Core Definition Lifting tab

  1. Add lift - if the lifts should be added always or manually
  2. Rotation - if the lifts should be rotated
  3. Min width four lift points
  4. Default type - which default lift type should be used. Lift type is basically a category of lift. In this example Lift type is different lifting angles
  5. Number of lifting points
  6. Lift set up - here, one will specify all the possible lifts for the definition depending on mass and lift type
  7. Placing long side
  8. Placing short side 
  9. Visibility - if and on what drawings the core fillings should be visible on
  10. Dimension 
  11. Length - the length of the core filling
  12. Cores - which cores the filling should be added to

drawing.png

Fígure 15: Hollow Core Definition Drawing tab

  1. Presentation - either geometry or symbol
  2. Scale - of the section on the shop drawing
  3. Dimension strand groups
  4. Text strand group properties 

naming.png

Fígure 16: Hollow Core Definition Naming tab

  1. Group - possibility to subcategorize elements of one element type
  2. Product
  3. Prefix designation
  4. Prefix element mark
  5. Prefix drawing name
  6. Drawing type
  7. Drawing template - default template that should be used

The Calculations tab is used for calculating slabs in floor plans. 

calc.png

Fígure 17: Hollow Core Definition Calculations tab

For Hollow Cores, there are two types of connections that can be predefined for the Hollow Core definition. The first one is Connection Recess and the other one is Connection Recess Edge

Connection Recess will go through the whole element.

recess.png

Fígure 18: Hollow Core Definition Recess tab

Connection Recess edge will be placed on one edge only.

recess_edge.png

Fígure 19: Hollow Core Definition Recess edge tab

Recess edge can have two different types

  1. Rectangular and circular
  2. Rectangular - the circular hole on the top will not be added
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