Perform a response spectrum analysis of this single degree of freedom system using the built-in 1994 UBC S1 spectrum. Compare the period with the calculated period below. Compare the spring force with the response spectrum below. | Problem Y Response Spectrum Analysis For Single Degree of Freedom System System k 64 k in k-sec2 in m 1 To Do Perform a response spectrum analysis of this single degree of freedom system using the built-in 1994 UBC S1 spectrum. Compare the period with the calculated period below. Compare the spring force with the response spectrum below. T 2n jm 2n seconds Note g in sec2 483 in sec2 1 g 1994 UBC S1 Spectrum 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 Y Solution 1. Click the drop down box in the status bar to change the units to kip-in. Kip-in 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 0 in the X direction edit box. In the Number of Grid Spaces area type 0 in the Y direction edit box. In the Number of Grid Spaces area type 0 in the Z direction edit box. Click the OK button. 4. Click the X in the upper right-hand corner of the window labeled 3-D View to close it. 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 at the origin to enter a joint. 7. Click the Pointer button to exit Draw Mode and enter Select Mode. 8. Select the joint by clicking on it. 9. From the Assign menu select Joint and then Springs. from the submenu to display the Joint Springs dialog box. 10. In this dialog box Type 64 in the Translation 1 edit box. Click the OK button. 11. Select the joint by clicking on it. 12. From the Assign menu select Joint and then Masses. from the submenu to display the Joint Masses dialog box. 13. In this dialog box In the Masses in Local Directions area type 1 in the Direction 1 edit box. 2 Click the OK button. 14. From the .
