Oasys GSA Documentation

# Loading

# Viewing loads

For a quick view of all loads applied to your structure for a particular load case, click on the Show load diagrams toolbar button then select to the desired load case in the cases dropdown.

show all loads

To annotate the loading values in the Graphic view, use the keyboard shortcut A and then graphically select which loads you want to annotate.

show all loads annotate

Note: All loads shown are drawn based on element locations. If you're in the Design layer and the loads are not being drawn in the right place, it could mean that the members and elements are out of sync.

# Load case specification

In GSA, loads are applied to load cases. The following describes how to set up your load cases to keep track of your loads.

Note: All these fields are optional. You can still apply loads to GSA without filling in these description; however, case names can be used to more easily refer to the load cases and case type is used for automatic load combinations.

  1. Go to Explorer pane > Data > Loading > Load case specification.

  2. Specify the Name, case type, source and other categories for each load case by filling out the specifications in table.

load case spec

# Nodal loading

The following steps show how to apply a node load to a particular node. Similar steps can be taken to specify an applied displacement or settlement at a particular node.

# Apply node load to a selection of nodes using the sculpt tool

  1. Use the node selection tool (keyboard shortcut n) to select nodes on the graphic view.
  2. Go to Sculpt > Create Nodal Loading > Create Node load... to open the node load wizard.

node loads sculpt

  1. Enter the load case, direction, axis and value then click OK to apply the load.

node loads wizard

  1. Click on the Show load diagrams toolbar button to view the load.

node loads view

# Apply node load to a selection of nodes using the data table

  1. Go to Explorer pane > Data > Loading > Nodal loading > Node loads to open the node loads table

  2. Enter the nodes numbers you want to apply the load to in the table.

Tip 1: You can use the keyboard shortcut N to select nodes on the graphic view, and then select Ctrl+C to copy and Ctrl+V paste the selected nodes into the nodal loading table.

Tip 2: You can also specify nodes by groups (e.g G1 for group 1) or lists (e.g. 'list name').

  1. Specify your load case, axis, direction and magnitude.

node loads table

# 1D entity loading

For 1D entities, you can apply loads to a member or an element. See the member and element loading explanation for more information on what each means.

The following steps show how to apply a beam load to a 1D member. Similar steps can be taken to specify other 1D loads for members or elements.

# Apply beam load to a selection of members using the sculpt tool

  1. Use the elements/members selection tool (keyboard shortcut E) to select members in the graphic view.

Note: Make sure you are in the design layer to select members. If you are in the analysis layer, the elements/members selection tool will select elements.

  1. Go to Sculpt > Create member/element loading > Create beam load... to open the beam load wizard.

beam loads sculpt

  1. Enter the load case, type, direction, axis and value then click OK to apply the load.

beam loads wizard

  1. Click on the Show load diagrams toolbar button to view the load.

Note: In order to apply and view the loads graphically, make sure that elements for the member have been created. To create elements from members, go to Model > Coordination tools > Create elements from members or use the toolbar button .

beam loads view

# Apply beam load to a selection of members using the data table

  1. Go to Explorer pane > Data > Loading > 1D entity loading > Beam loads.

  2. Select Members from the entity type dropdown. beam loads table

  3. Enter the 1D members you would like to apply the load to in the table.

Tip: You can load a list of members by specifying its property, group or by list name. E.g., ‘PB1’, ‘G1’, 'list name'.

beam loads table

  1. Specify your load case, type, axis, direction and magnitude.

  2. Click on the Show load diagrams toolbar button to view the load.

Note: In order to apply and view the loads graphically, make sure that elements for the member have been created. To create elements from members, go to Model > Coordination tools > Create elements from members or use the toolbar button .

# Apply other types of 1D entity loading

To apply loads to elements, follow a similar process but select Elements from the entity type dropdown.

To apply prestress, distortions and thermal loading, follow a similar process using the the tables located under beam loading in the explorer pane.

# 2D entity loading

For 2D entities, you can apply loads to a member or an element. See the member and element loading explanation for more information on what each means.

The following steps show how to apply a face load to a 2D member. Similar steps can be taken to specify other 2D loads for members or elements.

  1. Explorer Pane > Data > Loading > 2D entity loading > Face loads.

  2. Double click the record number to bring up the face load wizard or modify the table directly to input load case, type, axis, direction and magnitude.

Note: You have the option to choose from uniform, variable, or point for type of loading.

face loads

  1. Click on the Show load diagrams toolbar button to view the load.

Note: In order to apply and view the loads graphically, make sure that elements for the member have been created. To create elements from members, go to Model > Coordination tools > Create elements from members or use the toolbar button .

To apply edge, prestress, and thermal loading, follow a similar process using the the tables located under 2D entity loading loading in the Explorer pane.

# 3D entity loading

For 3D entities, you can apply loads to a member or an element. See the member and element loading explanation for more information on what each means.

The following steps show how to apply a face load to a 3D member. Similar steps can be taken to specify other 3D loads for members or elements.

  1. Explorer pane > Data > Loading > 3D entity loading > Face loads.

  2. Double click the record number to bring up the Face load wizard or modify the table directly to input load case, type, axis, direction and magnitude.

  3. Click on the Show load diagrams toolbar button to view the load.

Note: In order to apply and view the loads graphically, make sure that elements for the member have been created. To create elements from members, go to Model > Coordination tools > Create elements from members or use the toolbar button .

# Gravity loading

  1. Explorer pane > Data > Loading > Gravity loading.

  2. Enter which entities and nodes you would like to apply an acceleration to in the table.

alt text

# Grid loading

The following video shows how to add grid area loads to a surface and how to expand the load for checking purposes.

Oasys GSA - creating grid planes, surfaces, and area loads from Oasys on Vimeo.

See grid loads theory for more information on how grid loads are calculated.

# Sorting loads

You can sort load records by load case. Open the relevant load table, right click in the table and select Sort by case:

  1. Explorer pane > Data > Loading > Load case specification.

  2. Enter case type parameters in the Specification table.

  3. When complete, open another loading tab from the Explorer pane.

  4. Right click inside the table that opens and select Sort by case.

sort by case

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