Load Combinations
Output Stations
Prestressing
Click the File menu > New Model command to access the New Model form.
Click the drop-down list to set the units to 
.
Click the Beam button 
to access the Beam form. In that form:
Type 1 in the Number of Spans edit box.
Type 30 ft (be sure to type the ft) in the Span Length edit box.
Click the + (plus) symbol beside the Beams drop-down list to access the Frame Properties form.
Click the Add New Property button to access the Add Frame Section Property form. Choose Concrete in the Frame Section Property Type drop-down list. Click the Rectangular button to access the Rectangular Section form.
Type CONBEAM in the Section Name edit box.
Type 30 in the Depth (t3) edit box.
Type 18 in the Width (t2) edit box.
Click the + (plus) symbol beside the Material drop-down list to access the Define Materials form.
Click the Add New Material Quick button to access the Quick Material Definition form.
Select Concrete in the Material Type drop-down list.
Select f'c 6000Psi in the Specification drop-down list.
Click the OK button to return to the Define Materials form.
Click the Add New Material Quick button again to access the Quick Material Definition form.
Select Tendon in the Material Type drop-down list.
Ensure that ASTM A416 Grade 270 is selected in the Specifications drop-down list.
Click the OK button to return to the Define Materials form.
Highlight the 6000Psi definition in the Materials display area and click the Modify/Show Material button to access the Material Property Data form.
Change the Units to 
.
Verify that 0.15 is entered in the Weight per Unit Volume edit box.
Change the Units to .
Enter 4400 in the Modulus of Elasticity edit box.
Verify that 0.2 is entered in the Poisson's Ratio edit box.
Verify that 6 is entered in the Specified Concrete Compressive Strength, f'c edit box.
Click the OK buttons on the Material Property Data, Define Materials, Rectangular Section and Frame Properties forms to return to the Beams form.
Click the OK button on the Beams form to close that form and display the template model in the program windows.
Click the “X” in the top right-hand corner of the 3-D View window to close it.
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.
Type PRESTRES in the Load Pattern Name edit box.
Select OTHER from the Type drop-down list.
Click the Add New Load Pattern button.
Click the OK button.
Click the Draw menu > Frame/Cable/Tendons command to access the Properties of Object form. In that form,
Click the Line Object Type drop-down list and select the Tendon option.
Click on the joint at one end of the beam and then click on the joint at the other end of the beam to draw the tendon. The Tendon Data for Line Object 2 form will display when you release the mouse button.
With the Tendon Data for Line Object 2 form displayed, click the Parabolic Calculator button to access the Define Parabolic Tendon Layout for Line Object 2 form. In that form,
Select 1 from the Quick Start drop-down list in the lower left corner of the form.
Click the Quick Start button to update the Tendon Layout Data spreadsheet. An additional row of data will be added to the spreadsheet. In the spreadsheet area,
Type 8 in the Coord 2 cell of the first row of data.
Ensure that -12 is in the Coord 2 cell in the second row of data.
Type 3 in the Coord 2 cell in the third row of data.
Click the Refresh button to update the spreadsheet area and the graphical display area.
Ensure that the Use Calculated Results for This Tendon check box is checked.
Click the Done button to close the Define Parabolic Tendon Layout for Line Object 2 form and redisplay the Tendon Data for Line Object 2 form.
With the Tendon Data for Line Object 2 form redisplayed, click the Add button in the Tendon Loads area of the form to access the Tendon Load form. In that form,
Select the PRESTRES load pattern from the Load Pattern Name drop-down list.
Type 200 in the Force edit box.
Ensure that all of the Friction and Anchorage Losses and Other Loss Parameters are zero. If necessary, type zero in the Curvature Coefficient, Wobble Coefficient, Anchorage Set Slip, Elastic Shortening Stress, Creep Stress, Shrinkage Stress and Steel Relaxation Stress edit boxes.
Click the OK buttons on the Tendon Load form and the Tendon Data for Line Object 2 form to close those forms.
Click the Set Select Mode button 
to exit the Draw mode and enable the Select mode.
Click the drop-down list in the status bar to change the units to .
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 default Load Combination Name, COMB1
Accept the default Combination Type, Linear Add.
Verify that DEAD is selected in the Load Case Name drop-down list.
Verify that 1 is entered in the Scale Factor edit box.
Click the Add button.
Select LIVE from the Load Case Name drop-down list.
Click the Add button.
Select PRESTRES from 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 close all forms.
Select the line (frame) object.
Click the Assign menu > Frame Loads > Distributed command to access the Frame Distributed Loads form. In that form:
Verify that the Load Pattern Name is DEAD.
In the Load Type and Direction area, verify that the Forces option is selected and that the Gravity direction is selected.
In the Uniform Load area, type 2.2 in the Load edit box.
Click the OK button.
Select the line (frame) object.
Click the Assign menu > Frame Loads > Distributed command to access the Frame Distributed Loads form. In that form:
Select LIVE from the Load Pattern Name drop-down list.
In the Uniform Load area type 1.6 in the Load edit box.
Click the OK button.
Select the line (frame) object.
Click the Assign menu > Frame > Output Stations command to access the Assign Output Station Spacing form. In that form:
Type 4 in the Min Number Stations edit box.
Click the OK button.
Click the Show Undeformed Shape button 
to remove the displayed frame output station assignments.
Click the Analyze menu > Set Analysis Options command to access the Analysis Options form.
In that form click the Plane Frame XZ Plane button 
to set the available degrees of freedom.
Click the OK button.
Click the Run Analysis button 
to access the Set Load Cases to Run form. In that form:
Highlight (select) MODAL in the Case Name list and click the Run/Do Not Run Case button.
Verify that the DEAD load case is set to Run in the Action list.
Verify that the LIVE load case is set to Run in the Action list.
Verify that the PRESTRES load case is set to Run in the Action list.
Click the Run Now button to run the analysis.
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 the Display menu > Show Forces/Stresses > Frames/Cables command to access the Member Force Diagram for Frames form. In that form:
Select COMB1 from the Case/Combo Name drop-down list.
Select the Moment 3-3 option in the Component area.
Select the Show Values on Diagram option.
Click the OK button to display the moment diagram.
Note: For comparison purposes, print this moment diagram and print the one obtained when 20 output stations are specified (Step 24). To print the moment diagram, click the File menu > Print Graphics command.
Note: For load combinations, when force diagrams are plotted, exact values are calculated only at the ends of each output station. Those exact values are plotted and then they are connected with straight lines.
Click the Lock/Unlock Model button 
to unlock the model. Click the OK button when asked if it is ok to delete the results.
Select the line (frame) object.
Click the Assign menu > Frame > Output Stations command to access the Assign Output Station Spacing form. In that form:
Type 20 in the Min Number Stations edit box.
Click the OK button.
Click the Show Undeformed Shape button to remove the displayed frame output station assignments.
Click the Run Analysis button to access the Set Load Cases to Run form. In that form, click the Run Now button to run the analysis.
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 the Display menu > Show Forces/Stresses > Frames/Cables command to access the Member Force Diagram for Frames form. In that form:
Verify that the COMB1 is selected in the Case/Combo Name drop-down list.
Verify that the Moment 3-3 option is selected in the Component area.
Verify that the Show Values on Diagram option is selected.
Click the OK button to display the moment diagram.