WS21-1 NAS122, Workshop 21, August 2005 Copyright 2005 MSC.Software Corporation WORKSHOP 21 RESPONSE SPECTRUM ANALYSIS

WS21-2 NAS122, Workshop 21, August 2005 Copyright 2005 MSC.Software Corporation

WS21-3 NAS122, Workshop 21, August 2005 Copyright 2005 MSC.Software Corporation Problem Description u This workshop is for performing a response spectrum analysis of an appendage plate structure attached to the top of the previously studied tower structure model. The response spectra created during the previous workshop is to be used to establish the peak values of the modal coordinates for the modes of the appendage plate model. u A.bdf file is to be edited to include the needed MSC.Nastran entries to perform the analysis. The appendage plate model is described in an existing.bdf file. u The response spectra are in the.pch file created in the previous workshop.

WS21-4 NAS122, Workshop 21, August 2005 Copyright 2005 MSC.Software Corporation Problem Description (continued) Tower Seismic Input Tower Response SDOF oscillators Appendage plate structure

WS21-5 NAS122, Workshop 21, August 2005 Copyright 2005 MSC.Software Corporation Suggested Exercise Steps 1. Read the appendage plate model.bdf file just to observe the model. 2. Edit MSC.Nastran file rs_analysis_tower_plate.bdf to perform the response spectrum analysis. 3. Submit the job to MSC.Nastran. 4. Display the results from the analysis.

WS21-6 NAS122, Workshop 21, August 2005 Copyright 2005 MSC.Software Corporation Step 1. Read the Appendage Plate Model.bdf File Read the appendage plate model.bdf file into an MSC.Patran database to see what the model looks like. The name of the file is appendage_plate.bdf The plate model is to be attached to the top of the tower model using the nodes at the left edge of the plate

WS21-7 NAS122, Workshop 21, August 2005 Copyright 2005 MSC.Software Corporation Step 2. Edit MSC.Nastran File rs_analysis_tower_plate.bdf To perform an MSC.Nastran response spectrum analysis of the appendage plate model, edit the file named rs_analysis_tower_plate.bdf so it looks like that shown below. It is necessary to follow the steps shown in the course notes on response spectrum analysis.

WS21-8 NAS122, Workshop 21, August 2005 Copyright 2005 MSC.Software Corporation Step 2. Edit MSC.Nastran File rs_analysis_tower_plate.bdf (Cont.) To perform an MSC.Nastran response spectrum analysis of the appendage plate model, edit the file named rs_analysis_tower_plate.bdf so it looks like that shown below. It is necessary to follow the steps shown in the course notes on response spectrum analysis. (continued)

WS21-9 NAS122, Workshop 21, August 2005 Copyright 2005 MSC.Software Corporation Step 2. Edit MSC.Nastran File rs_analysis_tower_plate.bdf (Cont.) To perform an MSC.Nastran response spectrum analysis of the appendage plate model, edit the file named rs_analysis_tower_plate.bdf so it looks like that shown below. It is necessary to follow the steps shown in the course notes on response spectrum analysis. (continued)

WS21-10 NAS122, Workshop 21, August 2005 Copyright 2005 MSC.Software Corporation Step 2. Edit MSC.Nastran File rs_analysis_tower_plate.bdf (Cont.) To perform an MSC.Nastran response spectrum analysis of the appendage plate model, edit the file named rs_analysis_tower_plate.bdf so it looks like that shown below. It is necessary to follow the steps shown in the course notes on response spectrum analysis. (continued) Rename the.pch file created during the previous workshop to response_spectra.pch, or copy the.pch file naming it as indicated

WS21-11 NAS122, Workshop 21, August 2005 Copyright 2005 MSC.Software Corporation Step 3. Submit the job to MSC.Nastran Submit the model to MSC.Nastran u SOL 103 solution sequence u Response spectrum analysis of appendage plate model u Results output to a.op2 file u After analysis is complete, read the.op2 file into the MSC.Patran database that has the appendage plate model

WS21-12 NAS122, Workshop 21, August 2005 Copyright 2005 MSC.Software Corporation Step 4. Display the Results from the Analysis