Response spectrum analysis of a simplified multi-story building model — Welcome to LS-DYNA Examples

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This example shows how to run resonse spectrum analysis with *FREQUENCY_DOMAIN_RESPONSE_SPECTRUM for a simplified multi-story building model with shells and beams. *DEFINE_CURVE and *DEFINE_TABLE are used to define ground acceleration spectra for different damping coefficients. Post-processing is done with *DATABASE_FREQUENCY_BINARY_D3SPCM and *DATABASE_NODAL_FORCE_GROUP. Example 10.2 from LS-Dyna training class NVH, Fatigue and Frequency Domain Analysis with LS-DYNA by Yun Huang.

Keywords

*BOUNDARY_SPC_SET
*CONTROL_IMPLICIT_EIGENVALUE
*CONTROL_IMPLICIT_GENERAL
*CONTROL_IMPLICIT_NONLINEAR
*CONTROL_SHELL
*CONTROL_TERMINATION
*DATABASE_BINARY_D3PLOT
*DATABASE_FREQUENCY_BINARY_D3SPCM
*DATABASE_NODAL_FORCE_GROUP
*DEFINE_CURVE
*DEFINE_TABLE
*ELEMENT_BEAM
*ELEMENT_SHELL
*END
*FREQUENCY_DOMAIN_RESPONSE_SPECTRUM
*KEYWORD  
*MAT_ELASTIC
*NODE
*PART
*SECTION_BEAM
*SECTION_SHELL
*SET_NODE_LIST
*TITLE

Reduced Input

*KEYWORD  
*TITLE
LS-DYNA keyword deck by LS-PrePost
*FREQUENCY_DOMAIN_RESPONSE_SPECTRUM
         1       200        0.      100.        
      .001
         1         1     27000        0.
         1         2     27000        0.
*DATABASE_FREQUENCY_BINARY_D3SPCM
         1
*DATABASE_NODAL_FORCE_GROUP
        10         0
        20         0
*BOUNDARY_SPC_SET
         1         0         1         1         1         1         1         1
*SET_NODE_LIST
         1     0.000     0.000     0.000     0.000
         1        22        43        64        85       106       127       148
       169       190       211       232      4280      4281      4282      4283
      4284      4285      4286      4793      4794      4795      4805      4811
      4812
*SET_NODE_LIST
        10 
         1      4286      4285      4284      4283      4282      4281        85
      4280
*SET_NODE_LIST
        20 
        22      4812      4811      4805      4793      4795      4794       106
*PART
Part          1 for Mat         1 and Elem Type         1
         1         1         1
*SECTION_BEAM
         1         1  1.000000         2         0     0.000     0.000
  0.520000  0.520000  0.500000  0.500000     0.000     0.000
*MAT_ELASTIC
         1 2500.00003.0000E+10  0.200000     0.000     0.000         0
*PART
Part          2 for Mat         1 and Elem Type         2
         2         2         1         0         0         0         0         0
*SECTION_BEAM
         2         1  1.000000         2         0     0.000     0.000
  0.450000  0.450000  0.450000  0.450000     0.000     0.000
*PART
Part          3 for Mat         1 and Elem Type         3
         3         3         1         0         0         0         0         0
*SECTION_BEAM
         3         1  1.000000         2         0     0.000     0.000
  0.300000  0.300000  0.300000  0.300000     0.000     0.000
*PART
Part          4 for Mat         1 and Elem Type         4
         4         4         1         0         0         0         0         0
*SECTION_SHELL
         4        21  1.000000         3         1         0         0         1
  0.250000  0.250000  0.250000  0.250000     0.000     0.000     0.000         0
*PART
Part          5 for Mat         1 and Elem Type         5
         5         5         1         0         0         0         0         0
*SECTION_SHELL
         5        21  1.000000         3         1         0         0         1
  0.100000  0.100000  0.100000  0.100000     0.000     0.000     0.000         0
*DATABASE_BINARY_D3PLOT
  0.050000         0         0         0         0
         0
*DEFINE_TABLE
     27000     0.000     0.000
           0.0010000     27001
           0.0100000     27002
*DEFINE_CURVE
     27001         0     0.000     0.000     0.000     0.000         0
               0.300                1.00
               0.500               1.416
               1.000               2.178
               1.250               4.356
               5.000               4.356
             100.000               2.200
*DEFINE_CURVE
     27002         0     0.000     0.000     0.000     0.000         0
               0.300                0.98
               0.500               1.274 
               1.000               1.960 
               1.250               3.920 
               5.000               3.920 
             100.000               2.156 
*CONTROL_IMPLICIT_EIGENVALUE
       200     0.000         0     0.000         0     0.000         2     0.000
         0         0         0         0         1         0
*CONTROL_IMPLICIT_GENERAL
         1  1.000000         2         0         2         0         0         0
*CONTROL_IMPLICIT_NONLINEAR
         1         0         0     0.000     0.000     0.000     0.000     0.000
         2         1         0         2
         0         0     0.000         1         2
*CONTROL_SHELL
 20.000000         1        -1         1         2         2         1         0
  1.000000         1         0         1         0         0         0         0
         0         0         0         0         2
*CONTROL_TERMINATION
  1.000000         0     0.000     0.000     0.000
*ELEMENT_SHELL
*ELEMENT_BEAM
*NODE
*END

Figures

image_002.png

image_003.png

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