Filter
Top Products
Section 5
5-123
5.24 Element Plane Stress and Inplane Rotation
Specifications
Purpose
These commands allow the user to model the following conditions
on plate elements
a) PLANE STRESS condition
b) In-plane rotation stiffness reformulated to be rigid or to be
zero.
General Format:
⎧ PLANE STRESS ⎫
ELEMENT ⎨ RIGID ( INPLANE ROTATION ) ⎬
⎩ IGNORE ( INPLANE ROTATION ) ⎭
element-list
Description
The PLANE STRESS specification allows the user to model
selected elements for PLANE STRESS action only [No bending or
transverse shear stiffness].
See
Section 1.6
The RIGID INPLANE ROTATION command causes the program
to connect the corner Mz "in-plane rotation" action to the other
corner Mz rotations rigidly. The STAAD plate element
formulation normally produces a very soft Mz stiffness that
improves the inplane shear deformation. However when the plate
Mz is connected to a beam bending moment as the only load path
for that moment, then the RIGID INPLANE option may be used to
have that element carry the Mz moment to the other joints rigidly
to avoid the instability at the beam end. Usually only the elements
connected to beams in this manner would have this specification.
The IGNORE INPLANE ROTATION command causes the
program to ignore "in-plane rotation" actions. The STAAD plate