Civil Engineering Reference
In-Depth Information
y
Boundary fixed to a zero potential
4
7
1
nxe
=
3
nye
=
2
nels
=
6
neq
=
8
nn
=
12
nr
=
4
nod
=
4
nodof
=
1
ndof
=
4
nband
=
3
10
0
0
0
0
(a)
2
5
8
11
5
3
1
7
3
9
12
6
x
2
4
8
6
y
Restrained in x-direction
4
7
1
nxe
=
3
nye
=
2
nels
=
6
neq
=
14
nn
=
12
nr
=
6
nod
=
4
nodof
=
2
ndof
=
8
nband
=
7
10
1,2
5,6
0,13
9,10
E
(b)
2
5
8
11
7,8
11,12
0,14
3,4
3
9
12
6
x
0,0
0,0
0,0
0,0
Restrained in both directions
y
Restrained at zero pressure
Restrained in x-direction
4
7
0,19,0
1
nxe
=
3
nye
=
2
nels
=
6
neq
=
22
nn
=
12
nr
=
9
nod
=
4
nodof
=
3
ndof
=
8
ntot
=
12
nband
=
10
10
1,2,0
13,14,0
7,8,0
(c)
2
0,20,21
5
8
11
3,4,5
9,10,11
15,16,17
3
12
6
9
0,0,22
x
0,0,12
0,0,6
0,0,18
Restrained in both directions
Figure 3.16 Numbering system and data for regular meshes. (a) One degree of freedom
per node. (b) Two degrees of freedom per node. (c) Coupled problem with three degrees
of freedom per node
The variables in Figure 3.16 have the following meaning:
nxe
elements counting in
x
direction
nye
elements counting in
y
direction
nels
total number of elements
neq
total number of (non-zero) freedoms in problem
total number of nodes in problem
nn
number of restrained nodes
nr
number of nodes per element
nod
