Display Center of Mass and Weight

Reports one or more members' center of mass and total weight.

1 . Preselect a Member to enable the Members contextual page and click the Display Center of Mass and Weight icon found in the Tools section.

Alternative: Invoke Display Center of Mass and Weight using the Find Tool by searching the command name and clicking the icon, which is pictured above.

2 . The status line prompts, "Locate reference point". Left-click (Locate) a reference point the center of mass will be measured from.

Alternative 1: Press Esc or right-click (Return) to not add a reference point. The center of mass will be measured from the 0,0,0 global coordinate.

Alternative 2: If you did not preselect a member, the status line prompts, "Select members". Left-click (Locate) to select one or more members. Press Enter or right-click (Return) and select OK. Then follow step 2 above. Alternatively, press Esc or right-click (Return) to end the command.

3 . An OK dialog opens. It reports the center of mass and total weight of the selected members. Press OK to close the window and end the command.

Possibility 1 : If you located a reference point in step 2, the center of mass is reported with respect to that reference point.
Possibility 2 : If you did not locate a point in step 2, the center of mass is reported with respect to the 0, 0, 0 global coordinate.
  • The center of mass of a group of members is that global coordinates point around which the members' mass is evenly distributed.
  • The center of mass and total weight of a truss or members can be used to evaluate the optimal lifting point for a crane.
  • The total weight is the actual shipping weight of all materials that make up the members you selected, including shop bolts. The weight of the materials is calculated with cut-off material (such as copes and holes) removed.
  • The following fields are available in the Report Writer for obtaining data on individual members:
  • Report Writer:Member.Weight

    Report Writer:Member.CenterOfMassX

    Report Writer:Member.CenterOfMassY

    Report Writer:Member.CenterOfMassZ