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Plate Specs dialog

Used to specify finite element specifications.

Opens when Plate is clicked on the Specifications - Whole Structure dialog.

This dialog contains multiple tabs, each of which is used to add a different member specification.

Release tab

Used to release one or more degrees of freedom at the corner nodes of the elements. Unless a release is specified, elements are rigidly connected at the nodes (all six degrees of freedom are restrained) unless the node is a cantilever node or is supported.

Note: Refer to TR.22.2 Element Release Specification for additional information on plate element releases.
SettingDescription
Node

Select the node to be released. The node number depends on the Element Incidence for the element.

Release

Check the boxes for the FX, FY, FZ, MX, MY, or MZ directions to define the element release condition. These are based on the local coordinate system for the element.

Ignore Inplane Rotation tab

Used to override the value that STAAD determines for the stiffness associated with the local axis Mz degree of freedom for plate elements.

Refer to TR.24 Element Plane Stress and Ignore Inplane Rotation Specification for additional information.

There are no additional parameters for this plate element specification.

Rigid Inplane Rotation tab

Used to program to connect the corner Mz "in-plane rotation" action to the other corner Mz rotations rigidly

Refer to TR.24 Element Plane Stress and Ignore Inplane Rotation Specification for additional information.

There are no additional parameters for this plate element specification.

Plane Stress tab

Used to model plate elements as Plane Stress elements.

Refer to TR.24 Element Plane Stress and Ignore Inplane Rotation Specification for additional information.

There are no additional parameters for this plate element specification.

Ignore Stiffness tab

Used to instruct the program to neglect the stiffness of the selected plates while assembling the stiffness matrix. Hence, the stiffness contribution of the selected plates is not considered. This is similar to the Inactive command for the members.

When modeling plate elements, often we come across situations where we want the plates to carry loads, but at the same time do not want the stiffness of the plates to be considered in the analysis. For example, structural units such as glass panels or corrugated sheet roofs are subjected to loads like wind pressures or snow loads. While these elements are designed to carry the loads and transmit the same to the other parts of the structure, they are not designed to provide any additional stiffness to the structure.

Note: Refer to TR.22.3 Element Ignore Stiffness for additional information.

There are no additional parameters for this plate element specification.