Node Attributes: Non-Structural Mass

Description

Assigns non-structural mass to selected nodes using a scalar mass value, a dynamic scaling factor and an optional offset from the node.

Non-structural mass is similar to translational mass, except that it is load case dependent.

Dialog

Mass

Scalar value of mass.

Dyn Factor

Scales the mass value in dynamic analysis and, optionally, in the linear seismic load cases.

ID

Assigns an ID to the attribute.

By using different IDs, multiple non-structural mass attributes can be defined at the same node for the same load case.

IDs must be positive integers between 1 and 192.

Offset X / Y / Z

Three components that define the magnitude and direction of the offset of the mass from the node.

A mass offset is often used to consider accidental torsion effects in the dynamic analysis of buildings.

Coordinate System

The coordinate system (UCS) in which the offset components are defined.

The UCS is used only to define the global Cartesian components of the offset. Subsequent changes to the UCS do not affect the offset location.

Common Controls

• Components
• Equation Editor
• Retrieve from model
• Keep selection
• Scale / Add / Delete / Apply

Units

Mass (e.g.. kg, tonne, lb).

See Also

• Node Attributes: Translational Mass
• Node Attributes: Rotational Mass
• Vertex Attributes: Non-structural Mass
• Special Topics: Non-structural Mass
• Special Topics: Equivalent Static Seismic Analysis