Next: PROPERTY PHYSICAL PIPE [phname] real1 ... Up: PROPERTY PHYSICAL Previous: PROPERTY PHYSICAL DEFINE Type_name Nvals [ORIENT]
Next: PROPERTY PHYSICAL PIPE [phname] real1 ...
Up: PROPERTY PHYSICAL
Previous: PROPERTY PHYSICAL DEFINE Type_name Nvals [ORIENT]
This command is used to define or redefine beam sectional properties for
a general beam section. For general beam sections it is necessary
to define the beam area,
beam moment of inertia about the local z-axis, beam moment of inertia about
the local y-axis, beam product of inertia and beam torsional stiffness.
| phname | = | name of new physical property to be defined or name of existing |
| physical property to be modified. If no name is given a new name | ||
| will be automatically generated. | ||
| reals | = | otherwise 5 values defining the beam cross-sectional area, the beam |
| moment of inertia about the local z-axis, the beam moment of inertia about | ||
| the local y-axis, the beam product of inertia and the beam torsional | ||
| stiffness. | ||
| off1 | = | off1 is used to define the local offset at the start of the beam using |
| either a point name or an offset vector (x,y,z). When a point name is | ||
| used the offset will be the vector from the start of the first beam | ||
| element to the point. | ||
| off2 | = | off2 is used to define the local offset at the end of the beam using |
| either a point name or an offset vector (x,y,z). When a point name is | ||
| used the offset will be the vector from the end of the last beam | ||
| element to the point. | ||
| zdir | = | zdir is used to define the beam local z' axis direction; this can be |
| done either with an orientation vector or a point name. The orientation | ||
| vector requires three components to define the beam local z' axis in | ||
| terms of the global axis system (the default local direction is 0,0,1). | ||
| When a point name is used the beam local z' axis is defined | ||
| orthogonal to the line to which the property is attached and in a | ||
| direction towards the point. See example 3 below. |
To assign physical properties to a certain part of the structure use
the PROPERTY ATTACH command.
Examples:
Define a general beam section called PH1 with area = 1.0, beam moment of inertia about the local z-axis = 2.0, beam moment of inertia about the local y-axis = 3.0, beam product of inertia = 4.0, and beam torsional stiffness = 5.0.
Define a beam offset for a general beam section called PH1 with two identical unit offsets in the z-direction.
The first command defines the beam local z' axis using an orientation vector and the second uses a point to define the beam local z' axis direction. In the figure below the property SECT1 has been attached to the left hand line and the property SECT2 has been attached to the right hand line. The local axis system for the lines is shown with LABEL GEOMETRY AXES.
See also the following commands
'LABEL GEOMETRY AXES'
'LABEL GEOMETRY PHYSICAL'
'LABEL MESH PHYSICAL'
'PROPERTY ATTACH'
'UTILITY DELETE PHYSICAL'
'UTILITY TABULATE GEOMETRY PHYSICAL'
Femsys Limited
