Example 453: A steel-framed building modal analysis

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The comfile run by this example is as follows:

#Example_453 Modal analysis of a steel frame building
                                                                     
fem                            #set FEM environment                  
fem define nodes;r;building;example #read in the  nodes to define a 
#                              !  building
fem define window;c            #calculate the window size
fem define bases;r;;example        #defines a bilinear basis function
fem define elements;r;;example     #defines the building elements   
fem draw lines                 #make the line segments visible
fem define fibre;d             #default fibre angle
fem define element;r;;example fibre
fem define equation;r;;example     #Define a modal analysis using linear
#                              !  elasticity with plane stress elements.
fem define material;r;;example     #Define the material parameters for 
#                              !  steel.
fem list material              #List the material
fem define initial;r;;example      #Define initial and boundary conditions
#                              !  for the problem. In this case the
#                              !  displacements of the nodes at the
#                              !  bottom of the building are fixed in
#                              !  both the x and y directions.
fem draw node                  #Show the node numbers and the fixed
#                              !  boundary conditions
fem hide node                  #Hide the node numbers
fem define solve;r;;example        #Define the solution options. Only
#                              !  find the lowest 10 modes
fem list solve                 #List the solution parameters
fem solve                      #Solves the modal analysis problem
fem list modal mode 1          #Lists the modal frequency and shape
#                              !  for mode 1
fem list modal value           #List the modal frequencies
fem draw line mode 1 dotted    #lowest frequency mode
fem draw line mode 2 dotted                         
fem draw line mode 3 dotted                         
fem draw line mode 4 dotted                         
fem draw line mode 5 dotted                         
fem draw line mode 6 dotted                        
fem draw line mode 7 dotted                        
fem draw line mode 8 dotted                         
fem draw line mode 9 dotted                         
fem draw line mode 10 dotted   #higher frequency mode 

Additional testing commands:

fem list modal

Files used by this example are:

Name             Modified     Size

example_453.com 10-Apr-2000 2.4k building.com 20-Nov-2001 204 building.ipbase 10-Apr-2000 1.1k building.ipelem 10-Apr-2000 6.7k building.ipelfb 10-Apr-2000 3.7k building.ipequa 26-May-2003 1.7k building.ipinit 10-Apr-2000 641 building.ipmate 10-Apr-2000 1.4k building.ipnode 10-Apr-2000 6.8k building.ippara 12-Nov-2002 5.8k building.ipsolv 27-Aug-2002 487 test_output.com 10-Apr-2000 15

Download the entire example:

Name                      Modified     Size

examples_4_45_453.tar.gz 19-Aug-2006 10k

Testing status by version:

StatusTestedReal time (s)
i686-linux
cmSuccessSun Mar 6 00:01:55 20160
cm-debugSuccessSat Mar 5 00:02:12 20161
mips-irix
cmSuccessSun Aug 19 01:30:50 20074
cm-debugSuccessWed Aug 15 01:25:34 20079
cm-debug-clear-mallocSuccessSat Aug 18 01:29:16 200712
cm-debug-clear-malloc7SuccessMon Aug 20 01:25:27 200712
cm64SuccessSun Aug 19 01:31:14 20075
cm64-debugSuccessTue Aug 21 01:24:17 20078
cm64-debug-clear-mallocSuccessThu Apr 1 10:13:57 20045
rs6000-aix
cmSuccessWed Mar 4 01:07:16 20091
cm-debugSuccessMon Mar 2 01:06:58 20091
cm64SuccessWed Mar 4 01:07:16 20091
cm64-debugSuccessTue Mar 3 01:12:12 20092
x86_64-linux
cmSuccessSun Mar 6 00:01:02 20160
cm-debugSuccessSat Mar 5 00:01:13 20160

Testing status by file:


Html last generated: Sun Mar 6 05:50:21 2016

Input last modified: Wed Jan 4 13:46:55 2006


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