SAP2000 SAP2000 Web Tutorial 1

Step 14: Assigning Joint Masses
We will add joint masses consistent with those shown in Table B-1.
1. Click in the window labeled X-Y Plane @ Z=24 to make sure it is active. Note when the
window is active, its title bar will be highlighted.
2. Click joint 24 to select it.
3. From the Assign menu select Joint and then Masses… from the submenu. This will display
the Joint Masses dialog box.
4. In this dialog box:
Type .72 in the Direction 1 edit box in the Masses in Local Directions area.
Type .72 in the Direction 2 edit box in the Masses in Local Directions area.
In the Options area, select the Add to Existing Masses option.
Click the OK button to apply the mass.
Note: If we wanted to obtain vertical direction mode shapes we should include a Direction 3
mass as well.
5. Click joints 20, 23, 25 and 28 to select them.
6. From the Assign menu select Joint and then Masses… from the submenu. This will display
the Joint Masses dialog box.
7. In this dialog box:
Type .48 in both the Direction 1 edit box and the Direction 2 edit box in the Masses in
Local Directions area.
Click the OK button to apply the mass.
8. Click joints 19, 21, 27 and 29 to select them.
9. From the Assign menu select Joint and then Masses… from the submenu. This will display
the Joint Masses dialog box.
10. In this dialog box:
Type .3 in both the Direction 1 edit box and the Direction 2 edit box in the Masses in
Local Directions area.
SAP2000 Web Tutorial 1 67