# tailieunhanh - Problem E - Cables In Tension

## Steel E =29000 ksi, Poissons Ratio = All members are ” diameter steel cable Joint Loads At Joint D: FX = 50 kips FZ = -750 kips To Do Determine the X-direction displacements at joint D with and without considering the stiffening affect of tension in the cables. Use P-Delta analysis to consider the stiffening affect. | Problem E Cables In Tension Steel E 29000 ksi Poissons Ratio All members are diameter steel cable Joint Loads At Joint D FX 50 kips FZ -750 kips To Do Determine the X-direction displacements at joint D with and without considering the stiffening affect of tension in the cables. Use P-Delta analysis to consider the stiffening affect. Joint Coordinates Feet Joint X Y Z A -3 -2 10 B 0 4 10 C 3 -2 10 D 0 0 0 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 E 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 4 in the Y direction edit box. In the Number of Grid Spaces area type 1 in the Z direction edit box. In the Grid Spacing area type 3 in the X Direction edit box. In the Grid Spacing area type 2 in the Y Direction edit box. In the Grid Spacing area type 10 in the Z Direction edit box. Click the OK button. 4. Click in the window titled X-Y Plane @ Z 10 to make sure it is active. The window is highlighted when it is active. The screen appears as shown in Figure E-1. 5. Click the Draw Special Joint button on the side toolbar or select Add Special Joint from the Draw menu. 6. Click on the grid intersection labeled A in Figure E-1 to enter a joint at -3 -2 10 . 7. Click on the grid intersection labeled B in Figure E-1 to enter a joint at 0 4 10 . 8. Click on the grid intersection labeled C in Figure E-1 to enter a joint at 3 -2 10 . 9. Click the Down One Gridline button o to move to the X-Y Plane @ Z 0. 10. Click on the origin to enter a joint at 0 0 0 . 11. Click in the window

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