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problem description
title="Truss Sample Problem (Bridge)" nodes=12 elements=32
analysis=transient
analysis parameters
beta=0.25 gamma=0.5 duration=6.0 dt=0.05
nodes=[4,5,6] dofs=[Ty] mass-mode=lumped
nodes
1 x=0 y=0 z=0 constraint=pinned
2 x=70 y=18 constraint=free
3 x=140 y=0 constraint=roller
4 x=55 y=30 constraint=free force=front_pallet
5 x=70
6 x=85 force=front_pallet
7 x=0 y=0 z=48 constraint=roller_z
8 x=70 y=18 constraint=free
9 x=140 y=0 constraint=roller_xz
10 x=55 y=30 constraint=free force=rear_pallet
11 x=70
12 x=85 force=rear_pallet
truss elements
1 nodes=[1,2] material=flat
2 nodes=[1,4] material=double
3 nodes=[2,4] material=angle
4 nodes=[4,5] material=angle
5 nodes=[2,5] material=flat
6 nodes=[5,6] material=angle
7 nodes=[2,6] material=angle
8 nodes=[2,3] material=flat
9 nodes=[3,6] material=double
10 nodes=[1,7] material=flat
11 nodes=[3,9] material=flat
12 nodes=[2,8] material=flat
13 nodes=[4,10] material=flat
14 nodes=[5,11] material=flat
15 nodes=[6,12] material=flat
16 nodes=[7,8] material=angle
17 nodes=[7,10] material=angle
18 nodes=[8,10] material=flat
19 nodes=[10,11] material=angle
20 nodes=[8,11] material=flat
21 nodes=[11,12] material=angle
22 nodes=[8,12] material=flat
23 nodes=[8,9] material=angle
24 nodes=[12,9] material=angle
/*
* The non-symmetric bracing ...
*/
25 nodes=[1,5] material=flat
26 nodes=[3,5] material=flat
27 nodes=[1,3] material=angle
28 nodes=[7,9] material=flat
29 nodes=[4,7] material=angle
30 nodes=[6,9]
31 nodes=[4,11] material=flat
32 nodes=[6,11]
material properties
flat a=0.25 e=29e6 rho=3.4*0.25/12
angle a=0.4375 e=29e6 rho=3.4*0.4375/12
triple a=0.75 e=29e6 rho=3.4*0.75/12
built a=0.875 e=29e6 rho=3.4*0.875/12
double a=0.5 e=29e6 rho=3.4*0.5/12
/*
* based on an eccentric (6") load of 1000 lbs
* there will be 625 pounds going to the front truss
* and 375 pounds going to the back truss
*/
forces
front_pallet fy=-625/2*cos(t)
rear_pallet fy=-375/2*cos(t)
constraints
pinned tx=c ty=c tz=c
roller tx=u ty=c tz=c
roller_z tx=c ty=c tz=u
roller_xz tx=u ty=c tz=u
free tx=u ty=u tz=u
end
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