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. | Problem M Flat Plate In The X-Y Plane With A Twist Concrete E 3600 ksi Poissons Ratio Available Degrees of Freedom UZ RX RY Supports Joints A B and C have Z-direction supports as shown. To Do Determine support reactions at joints A B and C. Explain the apparently odd results for the reaction at joint C. 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 M Solution 1. Click the drop down box in the status bar to change the units to kip-ft. Kip-ft 30 2. From the File menu select New Model. This displays the Coordinate System Definition dialog box. 3. In this dialog box Select the Cartesian Tab. In the Number of Grid Spaces area type 2 in the X direction edit box. In the Number of Grid Spaces area type 2 in the Y direction edit box. In the Number of Grid Spaces area type 0 in the Z direction edit box. In the Grid Spacing area verify the X direction spacing is 4. In the Grid Spacing area type 6 the Y direction edit box. Click the OK button. 4. Click the X in the top right-hand corner of the 3-D View window to close it. 5. Verify that the Snap to Joints and Grid Points button on the side toolbar is depressed. 6. Click the Draw Rectangular Shell Element button d on the side toolbar or select Draw Rectangular Shell Element from the Draw menu. 7. Click on upper left-hand corner grid intersection coordinates are -4 6 0 and then click on the lower right-hand grid intersection coordinates are 4 -6 0 to draw a shell element over the entire structure. 8. Click the Pointer button to exit Draw Mode and enter Select Mode. 9. Click on the shell element to select it. 10. From the Edit menu select Mesh Shells. to display the Mesh Selected Shells dialog box. 11. Fill in this dialog box as shown in the adjacent figure and click the OK button. 12. Select the joints that are labeled A B and C .
