Click the File menu > New Model command to access the New Model form.
Click the drop-down list to the units to 
.
Click on the Shells button 
to access the Shells form. In that form:
Add To Model From Template
Load Combinations
New Model From Template
Click the File menu > New Model command to access the New Model form.
Click the drop-down list to the units to .
Click on the Shells button to access the Shells form. In that form:
Select Barrel Shell in the Shell Type drop-down list.
Type 40 in the Length, L edit box.
Type 35 in the Roll Down Angle, T edit box.
Type 20 in the Radius, R edit box.
Accept the default Number of Divisions, Axial, 8.
Accept the default Number of Divisions, Angular, 8.
Uncheck the Restraints check box.
Click the + (plus) symbol beside the Areas drop-down list to access the Area Sections form.
Select Shell in the Selection Section Type To Add drop-down list.
Click the Add New Section button to access the Shell Section Data form.
Verify that the Shell-Thin option is chosen in the Type area.
Click the + (plus) symbol beside the Material Name drop-down list to access the Define Materials form.
Highlight the 4000Psi definition in the Materials display list and click the Modify/Show Material button to access the Material Property Data form.
Verify that the Units are set to .
Verify that the Weight per Unit Volume is 0.15.
Change the Units to 
.
Type 3600 in the Modulus of Elasticity edit box.
Verify that 0.2 is specified for the Poisson's Ratio.
Click the OK buttons on the Material Property Data and Define Materials forms to return to the Shall Section Data form.
Verify that both the Membrane and Bending thicknesses are 1.
Click the OK buttons on the Area Section Data and Area Sections forms to return to the Shells form.
Click the OK button on the Shells form to close the form and display the template model in the program windows.
Click in the 3-D View window to make sure it is active. The window is highlighted when it is active.
Click the Select All button 
to select the entire structure.
Click the Edit menu > Move command to access the Move form. In that form:
Type 10 in the Delta Z edit box.
Click the OK button.
Click the Edit menu > Add To Model From Template command to access the New Model form. In that form click on the Shells button to access the Shells form. In that form:
Select Barrel Shell in the Shell Type drop-down list.
Accept the default Number of Divisions, Axial, 8.
Accept the default Number of Divisions, Angular, 8.
Type 40 in the Length, L edit box.
Type 35 in the Roll Down Angle, T edit box.
Type 30 in the Radius, R edit box.
Uncheck the Restraints check box if it is not already unchecked.
Click the Locate Origin button to access the Coordinate System form. In that form:
Select the 3D option.
Type 25 in the Z edit box in the Translations area.
Click the OK buttons on the Coordinate System and Shells forms to exit all forms.
Click in the Y-Z Plane @ X=-20 window to make sure it is active.
Verify that the drop-down list for the Coordinate System shows 
on the Status Bar.
Click the Set Display Options button 
(or the View menu > Set Display Options command) to access the Display Options for Active Window form. In that form:
Check the Labels box in the Joints area.
Click the OK button.
Right click on joint 82 in the Y-Z Plane @ X=-20 window. The Point Information form is displayed.
Highlight the Y-coordinate (-17.2073) and press the Ctrl and the C keys on the keyboard at the same time to copy the value to the clipboard.
Click the Cancel button to close the Point Information form.
Click the Edit menu > Add To Model From Template command to access the New Model form. In that form click on the Wall button 
to access the Shear Wall form. In that form:
Type 8 in the Number of Divisions, X edit box.
Type 4 in the Number of Divisions, Z edit box.
Type 5 in the Division Width, X edit box.
Type 2.5 in the Division Width, Z edit box.
Uncheck the Restraints check box if it is not already unchecked.
Click the Edit Grid button to access the Define Grid System Data form. In that form:
Click the Locate System Origin button to access the Coordinate System form. In that form:
Select the 3D option.
Highlight the Y edit box in the Translations area and press the Ctrl and the V keys on the keyboard at the same time to paste the -17.2073 value from the clipboard.
Type 15 in the Z edit box in the Translations area.
Click the OK buttons on the Coordinate System, Define Grid System Data and Shear Wall forms to exit all forms.
Verify that the drop-down list for the Coordinate System shows on the Status Bar.
Right click on joint 1 in the Y-Z Plane @ X=-20 window. The Point Information form is displayed.
Highlight the Y-coordinate (-11.4715) and press the Ctrl and the C keys on the keyboard at the same time to copy the value to the clipboard.
Click the Cancel button to close the Point Information form.
Click the Edit menu > Add To Model From Template command to display the New Model form. In that form click on the Wall button to display the Shear Wall form. In that form:
Type 8 in the Number of Divisions, X edit box.
Type 4 in the Number of Divisions, Z edit box.
Type 5 in the Division Width, X edit box.
Type 2.5 in the Division Width, Z edit box.
Uncheck the Restraints check box if it is not already unchecked.
Check the Use Custom Grid Spacing and Locate Origin check boxes.
Click the Edit Grid button to access the Define Grid System Data form. In that form:
Click the Locate System Origin button to access the Coordinate System form. In that form:
Select the 3D option.
Highlight the Y edit box in the Translations area and press the Ctrl and the V keys on the keyboard at the same time to paste the -11.4715 value from the clipboard.
Click the OK buttons on the Coordinate System, Define Grid Sysem Data and Shear Wall forms to exit all forms.
Verify that the drop-down list for the Coordinate System shows on the Status Bar.
Click in the Y-Z Plane @ X=-20 window to make sure it is active.
Click the View menu > Set 2D View command to access the Set 2D View form. In that form:
Select the X-Z plane option.
Type -11.4715 in the Y= edit box.
Click the OK button.
Select all of the objects in this view by “windowing.”
Click the View menu > Set 2D View command to access the Set 2D View form. In that form:
Select the X-Z plane option.
Type -17.2073 in the Y= edit box.
Click the OK button.
Select all of the objects in this view by “windowing.”
Click the View menu > Show Selection Only command.
Click the Perspective Toggle button 
.
Click the View menu > Show Grid command to toggle the grids off.
Click the View menu > Show Axes command to toggle the axes off.
Click the Draw menu > Draw Poly Area command to access the Properties of Object form. Verify that ASEC1 is shown in the Property drop-down list.
In the X-Z perspective view, click on joints 163, 195, 73 and 1, in that order, and press the Enter key on the keyboard to draw an area object.
Click the Set Select Mode button 
to exit Draw mode and enter Select mode.
Click on the just drawn area object to select it.
Click the Edit menu > Edit Areas > Divide Areas command to display the Divide Selected Areas form.
Fill in this form as shown in the figure and click the OK button.
Note: It is difficult to figure out whether to divide areas 3 by 8 or 8 by 3. It is often easiest to try one way, and if it is not right, click the Undo button 
and divide the areas the other way.
Select all of the objects in the X-Z perspective view by “windowing.”
Click the Edit menu > Replicate command to access the Replicate form. In that form:
Select the Mirror Tab.
In the Mirror About Line area select the Parallel to Z option.
In the Intersection of Plane with XY Plane area, type 0 in the x1 edit box if it is not already entered.
Type 1 in the x2 edit box.
Type 0 in the y1 edit box if it is not already entered.
Type 0 in the y2 edit box.
Click the OK button.
Click the View menu > Set 2D View command to access the Set 2D View form. In that form:
Select the X-Y plane option.
Type 0 in the Z= edit box if it is not already entered.
Click the OK button.
Select all of the joints at this level by “windowing.”
Click the Assign menu > Joint > Restraints command to access the Joint Restraints form. In that form:
Verify that the Translation 1, 2 and 3 boxes are all checked.
Click the OK button.
Click the View menu > Set 2D View command to access the Set 2D View form. In that form:
Select the Y-Z plane option.
Type 20 in the X= edit box.
Click the OK button.
Click the Show Undeformed Shape button 
to reset the window title.
Click the View menu > Show All command.
Click the Define menu > Load Patterns command to access the Define Load Patterns form. In that form:
Type LIVE in the Load Pattern Name edit box.
Select LIVE from the Type drop-down list.
Click the Add New Load Pattern button.
Click the OK button.
Click the Define menu > Load Combinations command to access the Define Load Combinations form. In that form:
Click the Add New Combo button to access the Load Combination Data form. In that form:
Accept the Load Combination Name, COMB1.
Accept the default Load Combination Type, Linear Add.
Select DEAD in the Load Case Name drop-down list (if it is not already selected) and type 1 in the Scale Factor edit box (if not already entered).
Click the Add button.
Select LIVE in the Load Case Name drop-down list.
Click the Add button.
Click the OK buttons on the Load Combination Data and Define Load Combinations forms to exit all forms.
Click in the 3-D View window to activate it. Be careful not to accidentally select any objects when you do this.
Click the View menu > Set Limits command to access the Set Limits form. In that form:
Type 25 in the Min edit box in the Set Z Axis Limits area.
Click the OK button.
Select all of the displayed objects in the 3D View window (i.e., all objects in the roof barrel) by “windowing.”
Click the Assign menu > Area Loads > Uniform (Shell) command to access the Area Uniform Loads form. In that form:
Select LIVE from the Load Pattern Name drop-down list.
Type .3 in the Load edit box.
Verify that Gravity is selected in the Direction drop-down list.
Click the OK button.
Click the Show Undeformed Shape button to remove the display of area uniform loads and to remove the limits that were set.
Click the Run Analysis button 
to access the Set Load Cases to Run form. In that form:
Click on MODAL in the Load Case Name list to highlight it.
Click the Run/Do Not Run Case button.
Click the Run Now button.
When the analysis is complete, check the messages in the SAP Analysis Monitor window (there should be no warnings or errors) and then click the OK button to close the window.
Click in the window entitled 3-D View to activate it.
Click the drop-down list in the status bar to change the units to .
Right click on the center joint of the upper barrel vault to see its self weight displacement in inches.
Right click on the center joint of the lower barrel vault to see its self weight displacement in inches.
Click the Show Deformed Shape button 
to access the Deformed Shape form. In that form:
Select COMB1 from the Case/Combo Name drop-down list.
Click the OK button.
Right click on the center joint of the upper barrel vault to see its self weight plus live load displacement in inches.
Right click on the center joint of the lower barrel vault to see its self weight plus live load displacement in inches.