Mechanical APDL Structural Analysis Guide

Choose menu path Main Menu> Solution> Load Step Opts> Spectrum> Single Point> Spectr Values.
The Spectrum Values - Damping Ratio dialog box appears.

Click on OK to accept the default of no damping. The Spectrum Values dialog box appears.

Enter 0.44 and 0.44 for FREQ1 and FREQ2, respectively.

Click on OK.The Spectrum Values dialog box closes.

6.3.4.12. Select Mode Combination Method

Choose menu path Main Menu> Solution> Load Step Opts> Spectrum> Single Point> Mode Combine.
The Mode Combination Methods dialog box appears.

Select SRSS as the mode combination method.

Enter 0.15 for the significant threshold.

Select displacement for the type of output. Click OK.The Mode Combination Methods dialog box closes.

6.3.4.13. Solve Spectrum Analysis

Choose menu path Main Menu> Solution> Solve> Current LS. The Solve Current Load Step dialog box
appears, along with a status window.

Carefully review the information in the status window, and then click on Close.

Click on OK on the Solve Current Load Step dialog box to start the solution.

When the solution is finished, a dialog box stating "Solution is done!" appears. Click on Close.

6.3.4.14. Postprocessing: Print Out Nodal, Element, and Reaction Solutions

Choose menu path Main Menu > General Postproc > Results Summary. The SET Command listing
window appears.

Review the information in the listing window, and click on Close. The SET Command listing window
closes.

Choose menu path Utility Menu> File> Read Input From. The Read File dialog box appears.

From the right side of the Read File dialog box, select the directory containing your results from the
scroll box.

From the left side of the Read File dialog box, select the Jobname.MCOM file from the scroll box.

Click on OK.The Read File dialog box closes.

Issue a PRNSOL,DOF command.

Issue a PRRSOL,F command.

6.3.4.15. Exit Mechanical APDL.

In the Mechanical APDL Toolbar, click on Quit.

Example Spectrum Analysis (GUI Method)