beam
Module¶
- defines:
- CBEAM
- BEAMOR
-
class
pyNastran.bdf.cards.elements.beam.
BEAMOR
(pid, is_g0, g0, x, offt='GGG', comment='')[source]¶ Bases:
pyNastran.bdf.cards.base_card.BaseCard
1 2 3 4 5 6 7 8 9 BEAMOR PID G0/X1 X2 X3 OFFT BEAMOR 39 0.6 2.9 -5.87 GOG -
type
= 'BEAMOR'¶
-
-
class
pyNastran.bdf.cards.elements.beam.
CBEAM
(eid, pid, nids, x, g0, offt='GGG', bit=None, pa=0, pb=0, wa=None, wb=None, sa=0, sb=0, comment='')[source]¶ Bases:
pyNastran.bdf.cards.elements.bars.LineElement
1 2 3 4 5 6 7 8 9 CBEAM EID PID GA GB X1 X2 X3 OFFT/BIT PA PB W1A W2A W3A W1B W2B W3B SA SB or
1 2 3 4 5 6 7 8 9 CBEAM EID PID GA GB G0 OFFT/BIT PA PB W1A W2A W3A W1B W2B W3B SA SB offt/bit are MSC specific fields
Adds a CBEAM card
Parameters: - pid : int
property id
- mid : int
material id
- nids : List[int, int]
node ids; connected grid points at ends A and B
- x : List[float, float, float]
Components of orientation vector, from GA, in the displacement coordinate system at GA (default), or in the basic coordinate system
- g0 : int
Alternate method to supply the orientation vector using grid point G0. Direction of is from GA to G0. is then transferred to End A
- offt : str; default=’GGG’
Offset vector interpretation flag None : bit is active
- bit : float; default=None
Built-in twist of the cross-sectional axes about the beam axis at end B relative to end A. For beam p-elements ONLY! None : offt is active
- pa / pb : int; default=0
Pin Flag at End A/B. Releases the specified DOFs
- wa / wb : List[float, float, float]
Components of offset vectors from the grid points to the end points of the axis of the shear center
- sa / sb : int; default=0
Scalar or grid point identification numbers for the ends A and B, respectively. The degrees-of-freedom at these points are the warping variables . SA and SB cannot be specified for beam p-elements
- comment : str; default=’‘
a comment for the card
- offt/bit are MSC specific fields
-
classmethod
add_card
(card, beamor=None, comment='')[source]¶ Adds a CBEAM card from
BDF.add_card(...)
Parameters: - card : BDFCard()
a BDFCard object
- beamor : BEAMOR() or None
defines the defaults
- comment : str; default=’‘
a comment for the card
-
center_of_mass
(self)[source]¶ the centroid formuala is way more complicated if you consider the nonstructural mass axis
-
center_of_mass_xform
(self)[source]¶ A B ———- ^ ^ | wa | wb | | 1———-2
1-2 are the nodes of the bar A-B defines the axis of the shear center
^ z+–+ | | | | | | 2—> y | +–+ | | +—–+
-
cross_reference
(self, model)[source]¶ Cross links the card so referenced cards can be extracted directly
Parameters: - model : BDF()
the BDF object
-
get_axes
(self, model)[source]¶ Gets the axes of a CBAR/CBEAM, while respecting the OFFT flag.
Notes
pyNastran.bdf.cards.elements.bars.rotate_v_wa_wb()
for a description of the OFFT flag.is_passed: bool out: (wa, wb, _ihat, jhat, khat)
-
get_axes_by_nodes
(self, model, pid_ref, node1, node2, xyz1, xyz2, log)[source]¶ Gets the axes of a CBAR/CBEAM, while respecting the OFFT flag.
Notes
pyNastran.bdf.cards.elements.bars.rotate_v_wa_wb()
for a description of the OFFT flag.
-
get_x_g0_defaults
(self)[source]¶ X and G0 compete for the same fields, so the method exists to make it easier to write the card
Returns: - x_g0 : varies
g0 : List[int, None, None] x : List[float, float, float]
Notes
Used by CBAR and CBEAM
-
is_bit
¶ is the bit flag active?
-
is_offt
¶ is the offt flag active?
-
node_ids
¶
-
nodes
¶
-
nodes_ref
¶
-
repr_fields
(self)[source]¶ Gets the fields in their simplified form
Returns: - fields : List[varies]
the fields that define the card
-
type
= 'CBEAM'¶