Home » Knowledge » NVH / Fatigue » Response spectrum analysis of a simplified multi-story building model
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
*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
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