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problem description
title="Modal Analysis Example"
nodes=18 elements=24 analysis=modal
analysis parameters
duration=0 dt=0 beta=0 gamma=0 alpha=0 mass-mode=lumped
nodes
1 x=4 y=0 z=0 constraint=fixed
2 x=5 y=0 z=0
3 x=4 y=1 z=0 constraint=free
4 x=4 y=2 z=0
5 x=5 y=1 z=0
6 x=5 y=2 z=0
7 x=4 y=3 z=0
8 x=4 y=4 z=0
9 x=5 y=3 z=0
10 x=5 y=4 z=0
11 x=4 y=5 z=0
12 x=4 y=6 z=0
13 x=5 y=5 z=0
14 x=5 y=6 z=0
15 x=4 y=7 z=0
16 x=4 y=8 z=0
17 x=5 y=7 z=0
18 x=5 y=8 z=0
beam elements
1 nodes=[1,3] material=column
2 nodes=[3,4]
3 nodes=[4,7]
4 nodes=[7,8]
5 nodes=[8,11]
6 nodes=[11,12]
7 nodes=[12,15]
8 nodes=[15,16]
9 nodes=[2,5]
10 nodes=[5,6]
11 nodes=[6,9]
12 nodes=[9,10]
13 nodes=[10,13]
14 nodes=[13,14]
15 nodes=[14,17]
16 nodes=[17,18]
17 nodes=[16,18] material=beam
18 nodes=[17,15]
19 nodes=[12,14]
20 nodes=[13,11]
21 nodes=[8,10]
22 nodes=[9,7]
23 nodes=[4,6]
24 nodes=[5,3]
material properties
beam E=3e+06 A=10 Ix=500 rho=0.005
column E=3e+06 A=20 Ix=450 rho=0.005
constraints
fixed Tx=c Ty=c Tz=u Rx=u Ry=u Rz=c
free Tx=u Ty=u Tz=u Rx=u Ry=u Rz=u
canvas configuration
node-numbers=true element-numbers=true snap=true grid=true
snap-size=1 grid-size=1
node-color=Blue element-color=Black label-font="5x8"
tool-color=Red tool-font="fg-22"
x-min=-1 x-max=10 y-min=-1 y-max=10
x-pos=0 y-pos=0 width=502 height=502 scale=45.6364
end
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