CSI Solution Demonstrates Use of These Features

• Concrete Design

• New Model From Template

Problem H Solution

1.  Click the File menu > New Model command to access the New Model form.

2. Click the drop-down list to set the units to .

3.  Click the Beam button  to access the Beam form. In that form:

   • Accept the default value for the Number of Spans (2).

   • Type 24 ft (be sure to include the ft) in the Span Length edit box. The program will automatically convert this measurement to 288 inches, the base units for the model set in Step 2.

   • 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. Note that three definitions are shown in the Materials display list, including the A615Gr60 definition for rebar.

       • Highlight the 4000Psi 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 3600 in the Modulus of Elasticity edit box.

         • Verify that 0.2 is entered in the Poisson's Ratio edit box.

         • Verify that 4 is entered in the Specified Concrete Compressive Strength, f'c edit box.

         • Click the OK buttons on the Material Property Data and Define Materials forms to return to the Rectangular Section form.

     • On the Rectangular Section form, click the Concrete Reinforcement button to access the Reinforcement Data form.

     • • In the Design Type area, select the Beam option.

       • In the Concrete Cover to Longitudinal Rebar Center area, type 3.5 in the Top edit box.

       • Verify that 2.5 is in the Bottom edit box.

       • Click the OK buttons on the Reinforcement Data, Rectangular Section and the Frame Properties forms to return to the Beam form.

   • Click the OK button to close the Beams form and display the template model in the program windows.

4. Click the “X” in the top right-hand corner of the 3-D View window to close it.

5. Click the drop-down list in the status bar to change the units to .

6. 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.

   • Verify 0 is entered in the Self Weight Multiplier edit box.

   • Click the Add New Load Pattern button.

   • Click the OK button.

7. Select the two line (frame) objects.

8. 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.

9. Select the two line (frame) objects.

10. Click the Assign menu > Frame Loads > Distributed command to access the Frame Distributed Loads form. In that form:

    1. Select LIVE from the Load Pattern Name drop-down list.

    2. In the Uniform Load area, type 1.6 in the Load edit box.

    3. Click the OK button.

11. 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.

12. Click the Design menu > Concrete Frame Design > Review/Revise Preferences command to access the Concrete Frame Design Preferences form. In that form:

    • Select ACI 318-99 from the Design Code drop-down list.

    • Verify that the Strength Reduction (Phi) Factors are 0.9, 0.7, 0.75 and 0.85 for Bending Tension, Compression Tied, Compression Spiral and Shear respectively.

    • Click the OK button.

13. 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.

    • Click the Run Now button to run the analysis.

14. 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.

15. Click the Design menu > Concrete Frame Design > Start Design/Check of Structure command to run the design check. When the design is finished, the area of longitudinal bar required is displayed on the screen.  Note that the current units are kips and feet.

16.  Click the drop-down list in the status bar to change the units to . Note that the values for the area of longitudinal reinforcing steel are now in units of square inches.

17. Click the Design menu > Concrete Frame Design > Select Design Combos command to access the Design Load Combinations Selection form. In that form:

• • The automatically generated combinations for concrete design, DCON1 and DCON2, are included in the Design Combos list box.

  • Highlight DCON1 and click the Show button to access the Load Combination Data form. In that form:

  • • Note the definition of the load combination in the Define Combination area.  It should be 1.4DEAD.

    • Click the Cancel button to return to the Design Load Combinations Selection form.

  • Highlight DCON2 and click the Show button to access the Load Combination Data form. In that form:

  • • Note the definition of the load combination in the Define Combination area.  It should be 1.4DEAD + 1.7LIVE.

    • Click the Cancel button to return to the Design Load Combinations Selection form.

  • Click the OK button on the Design Load Combinations Selection form to close all forms.

20. Click the Design menu > Concrete Frame Design > Display Design Info command to access the Display Concrete Design Results form. In that form:

• • Verify that the Design Output option is selected.

  • Select Shear Reinforcing from the Design Output drop-down list.

  • Click the OK button. The required shear reinforcing is displayed on the screen.

Note:   The values for the shear reinforcing steel are reported as an area per unit length of element.  Since the current units are kips and inches, the shear reinforcing reported is in square inches per inch.

21.  Right click on the left beam to access the Concrete Beam Design Information (ACI 318-99) form. In that form:

• • Note that the required top and bottom longitudinal steel and the required shear steel is reported for each design load combination at each output segment along the beam.

  • Click the Flex. Details button to display flexural design details for the highlighted design load combination and output station location. The Concrete Design Information ACI 318-99 form is displayed.

  • When finished viewing the detailed information, click the “X” in the upper right-hand corner of the Concrete Design Information ACI 318-99  form to close it.

  • Click the OK button to close the Concrete Beam Design Information form to close the form.

This problem is complete.