ansys beam
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BEAM3 is a uniaxial element with tension, compression, and bending
capabilities. The element has three degrees of freedom at each node:
translations in the nodal x and y directions and rotation about the nodal
z-axis. See BEAM3 in the ANSYS, Inc. Theory Reference for more details
about this element. Other 2-D beam elements are the plastic beam (BEAM23)
and the tapered unsymmetric beam (BEAM54).
Figure 3.1 BEAM3 Geometry
BEAM3 Input Data
Figure 3.1: "BEAM3 Geometry" shows the geometry, node locations, and the
coordinate system for this element. The element is defined by two nodes,
the cross-sectional area, the area moment of inertia, the height, and the
material properties. The initial strain in the element (ISTRN) is given
by Δ/L, where Δ is the difference between the element length, L (as
defined by the I and J node locations), and the zero strain length. The
initial strain is also used in calculating the stress stiffness matrix,
if any, for the first cumulative iteration.
You can use the element in an axisymmetric analysis if hoop effects are
negligible, such as for bolts, slotted cylinders, etc. The area and moment
of inertia must be input on a full 360° basis for an axisymmetric analysis.
The shear deflection constant (SHEARZ) is optional. You can use a zero
value of SHEARZ to neglect shear deflection. See Shear Deflection for
details. The shear modulus (GXY) is used only with shear deflection. You
can specify an added mass per unit length with the ADDMAS real constant.
Node and Element Loads describes element loads. You can specify pressures
as surface loads on the element faces, shown by the circled numbers in
Figure 3.1: "BEAM3 Geometry". Positive normal pressures act into the
element. You specify lateral pressures as a force per unit length. End
"pressures" are input as a force. KEYOPT(10) allows tapered lateral
pressures to be offset from the nodes. You can specify temperatures as
element body loads at the four "corner" locations shown in
Figure 3.1:
"BEAM3 Geometry". The first corner temperature T1 defaults to TUNIF. If
all other temperatures are unspecified, they default to T1. If only T1
and T2 are input, T3 defaults to T2 and T4 defaults to T1. For any other
input pattern, unspecified temperatures default to TUNIF.
KEYOPT(9) is used to request output at intermediate locations. It is based
on equilibrium (free body of a portion of the element) considerations and
is not valid if:
stress stiffening is turned on [SSTIF,ON]
more than one component of angular velocity is applied [OMEGA]
any angular velocities or accelerations are applied with the CGOMGA,
DOMEGA, or DCGOMG commands.
"BEAM3 Input Summary" summarizes the element input.
Element Input
contains a general description of element input.
