It is necessary to adjust the model slightly so that the connections can be defined in a simple way. Otherwise, it would be rather complex to model them.
If there are any results shown, switch them off by clicking the
button on the toolbar. Then make sure that the Wireframe Model view is active. You can set it by selecting the
option from the
list button.
Dividing Frame Girder
The frame girder was modeled as a single continuous beam. To create steel joints where the smaller beams frame into the girder, the frame girder must be split up.
Click the
button on the toolbar so that the 'Connect Lines/Members' function is activated. Then draw a window over the entire frame girder.
When the program asks you whether all results are to be deleted because of the modification, click Yes. Then the continuous line of member 4 is split up.
Right-click in an empty area of the workspace or press Esc to quit the function.
Adjusting Member Eccentricities
The member eccentricities resulting from the division need to be adjusted. Select the Navigator - Data and then open the Types for Members category. In the Member Eccentricities category, double-click the eccentricity type no. 1 - Relative to Section.
In the 'Edit Member Eccentricity' dialog box, click the
button to copy the selected member eccentricity.
Clear the Axial offset from adjoining member option.
Click OK to close the dialog box. To assign the new type of eccentricity, right-click that item in the 'Navigator - Data'. Then select the Assign to Member option in the shortcut menu.
The members are divided graphically in thirds. Select those parts of the frame girder where the inner grid girders are connected:
- Member 4 - End (click the right part)
- Member 10 (click the center part to allocate it to both ends)
- Member 11 - Start (click the left part)
Click OK in the 'Members Assignment' window to allocate the eccentricities.
You can check the modifications in the 'Transparent Model' view.
For the further steps, set the Wireframe Model view again.
Adjusting Action Category of Load Cases
Make sure LC2, LC3, and LC4 are set to ‘Live load’ for the Action Category. When making a change to the standard edition (i.e., from 2016 to 2022), all Action Categories are automatically reset to ‘Dead load’.
Adjusting Load Wizard for Platform
When splitting up the frame girder, new members were created. This modification also has an effect on the Load Wizard which converts the platform load to the smaller beams.
Set LC4 Platform in the list of load cases on the toolbar (1). Then click the
button to display the loads (2).
You will notice that the distribution of the loads is no longer correct as the load is assigned some members of the frame girder. Open Load Wizard either by double-clicking the load or the corresponding item in the 'Navigator - Data' (3).
In the 'Edit Load Wizard' dialog box, switch to the Geometry tab (1).
Click the
button in the 'Remove Influence from' area (2) to add the irrelevant members of the frame girder graphically.
In the work window, select the new members nos. 10 and 11 by clicking them one after another.
When you have clicked OK, you return to the dialog box. Close it by clicking OK again. All members of the frame girder are without loads now.
Finally click the
button to hide the loads again.