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Concrete E =4400 ksi, Poissons Ratio = 0.2 f’c = 6 ksi Cable Tension = 200 kips To Do Determine the moment diagram for a DL + LL + PRESTRESS loading combination. Compare the results using 4 output segments and using 30 output segments. | Problem I Prestressed Concrete Beam Concrete E 4400 ksi Poissons Ratio 0.2 fc 6 ksi Cable Tension 200 kips To Do Determine the moment diagram for a DL LL PRESTRESS loading combination. Compare the results using 4 output segments and using 30 output segments. wDL 2.2 klf not including beam weight wLL 1.6 klf uuuuuuuuuu Note Our intent is that you try this problem on your own first. After you have solved it on your own you can step through our solution if desired. If you have problems trying to create the model then follow the steps in our solution. 1 Problem I Solution 1. Click the drop down box in the status bar to change the units to kip-ft. Kip-ft 30 2. 3. 4. From the File menu select New Model From Template. This displays the Model Templates dialog box In this dialog box click on the Beam template dialog box button to display the Beam In this dialog box Type 1 in the Number of Spans edit box Type 30 in the Span Length edit box Click the OK button 5. Click the X in the top right-hand corner of the 3-D View window to close it. 6. From the Define menu select Materials. to display the Define Materials dialog box. 7. Click on CONC in the Materials area to highlight select it and then click the Modify Show Material button. The Material Property Data dialog box is displayed. 8. In this dialog box Verify 0.15 is entered in the Weight per Unit Volume edit box. Click the OK button twice to exit all dialog boxes. 9. Click the drop down box in the status bar to change the units to kip-in. Kip-in 30 10. From the Define menu select Materials. to display the Define Materials dialog box. 11. Click on CONC in the Materials area to highlight select it and then click the Modify Show Material button. The Material Property Data dialog box is displayed. 12. In this dialog box Type 4400 in the Modulus of Elasticity edit box. Verify .2 is entered in the Poisson s Ratio edit box. Verify 60 is entered in the Reinforcing Yield Stress fy edit box. Type 6 in the Concrete Strength fc edit .
