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.

position v

the element with a centroid closest to v is selected

surface-x v

the local \(x\)-direction used to determine the local surface coordinate system. Only available if noted.