3.1.14. mass Command

This command assigns lumped mass values to an existing node. The number of mass values must match the number of degrees of freedom at the node.

mass $nodeTag $m1 $m2 ...

Argument	Type	Description
$nodeTag	integer	tag of the node whose mass is being set
$m1 $m2 …	list float	nodal mass values for each DOF (diagonal lumped mass matrix)

Note

Mass can also be assigned when a node is created using the node Command command with the -mass option.

Example

The following example assigns mass in the x and z directions at node 2 for a 6-DOF model.

1. Tcl Code

mass 2 2.5 0.0 2.5 0.0 0.0 0.0

2. Python Code

ops.mass(2, 2.5, 0.0, 2.5, 0.0, 0.0, 0.0)

Code Developed by: fmk