structure shell history
command
Syntax
- structure shell history <name s > keyword
Primary keywords:
force force-x force-y force-z moment moment-x moment-y moment-z resultant-mx resultant-my resultant-mxy resultant-nx resultant-ny resultant-nxy resultant-qx resultant-qy principal-intermediate principal-maximum principal-minimum stress-xx stress-xy stress-xz stress-yy stress-yz stress-zz
Sample shell responses. The nodes of a shell element will be ordered counter-clockwise with respect to the outside of the zone faces upon which the shell was created.
If the optional name keyword is used, the history can be assigned a name for later reference. If not used, the history will be assigned a default name based on the internally assigned ID number.
The element to be sampled must be identified by either component ID (component-id i) or by position (position v). If position v is used, the shellSEL nearest to v is taken.
For some
structure shell
histories, the node of the element to be sampled may be specified optionally with node i (where i = 1, 2, or 3). When node is omitted, node 1 is used by default.For resultant histories, the surface system corresponds with the given value of Surface-X v (i.e., each time a stress-resultant history is sampled, the logic of the
structure shell recover surface
command is invoked for the specified geogridSEL). Surface-X v is required for these histories.For stress histories, stresses are computed at a shell depth given by Depth-Factor f as follows. The shell depth equals \(Ft\)/2, where \(F\) is the depth factor and \(t\) is the shell thickness. \(F\) equal to +1/-1 corresponds with the outer/inner shell surface (outer surface defined by positive shell \(z\)-direction), and \(F\) = 0 corresponds with the shell mid-surface. f defaults to +1 if depth-factor is not specified.
- force [shellhistoryblock]
force magnitude, global system
- force-x [shellhistoryblock]
nodal force (\(x\)-component, global system)
- force-y [shellhistoryblock]
nodal force (\(y\)-component, global system)
- force-z [shellhistoryblock]
nodal force (\(z\)-component, global system)
- moment [shellhistoryblock]
moment magnitude, global system
- moment-x [shellhistoryblock]
nodal moment (\(x\)-component, global system)
- moment-y [shellhistoryblock]
nodal moment (\(y\)-component, global system)
- moment-z [shellhistoryblock]
nodal moment (\(z\)-component, global system)
- resultant-mx [shellhistoryblock]
stress resultant \(M_x\) (surface system). Uses the surface-x keyword.
- resultant-my [shellhistoryblock]
stress resultant \(M_y\) (surface system). Uses the surface-x keyword.
- resultant-mxy [shellhistoryblock]
stress resultant \(M_{xy}\) (surface system). Uses the surface-x keyword.
- resultant-nx [shellhistoryblock]
stress resultant \(N_x\) (surface system). Uses the surface-x keyword.
- resultant-ny [shellhistoryblock]
stress resultant \(N_y\) (surface system). Uses the surface-x keyword.
- resultant-nxy [shellhistoryblock]
stress resultant \(N_{xy}\) (surface system). Uses the surface-x keyword.
- resultant-qx [shellhistoryblock]
stress resultant \(Q_x\) (surface system). Uses the surface-x keyword.
- resultant-qy [shellhistoryblock]
stress resultant \(Q_y\) (surface system). Uses the surface-x keyword.
- principal-intermediate [shellhistoryblock]
principal intermediate stress, global system. Uses the depth-factor keyword.
- principal-maximum [shellhistoryblock]
principal maximum stress, global system. Uses the depth-factor keyword.
- principal-minimum [shellhistoryblock]
principal minimum stress, global system. Uses the depth-factor keyword.
- stress-xx [shellhistoryblock]
stress (\(xx\)-component, global system). Uses the depth-factor keyword.
- stress-xy [shellhistoryblock]
stress (\(xy\)-component, global system). Uses the depth-factor keyword.
- stress-xz [shellhistoryblock]
stress (\(xz\)-component, global system). Uses the depth-factor keyword.
- stress-yy [shellhistoryblock]
stress (\(yy\)-component, global system). Uses the depth-factor keyword.
- stress-yz [shellhistoryblock]
stress (\(yz\)-component, global system). Uses the depth-factor keyword.
- stress-zz [shellhistoryblock]
stress (\(zz\)-component, global system). Uses the depth-factor keyword.
structure shell history
Keyword Block
The following keywords are available to control the location and other details of the history. Some keywords are only available if noted. force
, force-x
, force-y
, force-z
, moment
, moment-x
, moment-y
, moment-z
, principal-intermediate
, principal-maximum
, principal-minimum
, resultant-mx
, resultant-mxy
, resultant-my
, resultant-nx
, resultant-nxy
, resultant-ny
, resultant-qx
, resultant-qy
, stress-xx
, stress-xy
, stress-xz
, stress-yy
, stress-yz
and stress-zz
.
- component-id i
the element is selected by its individual component ID number
- depth-factor f
the depth factor used to determine element stresses. Only available if noted.
- node i
the node location to use when retrieving values from the element. Must be from 1 to 3. Only available if noted.
- surface-x v
the local \(x\)-direction used to determine the local surface coordinate system. Only available if noted.
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