# BbarBrickWithSensitivity Command
This command is used to construct an eight-node 3D brick element object based on a trilinear isoparametric formulation.
```tcl element bbarBrickWithSensitivity $eleTag $node1 $node2 $node3 $node4 $node5 $node6 $node7 $node8 $matTag ```
eleTag

unique element object tag.

$node1 - $node8

eight nodes defining element boundaries (numbered as shown in the figure below).

matTag

tag associated with previously-defined nDMaterial object.

_Numbering_of_nodes_for_the_B-bar_brick_element.jpg

Currently, there are no sensitivity parameters in the ‘bbarBrickWithSensitivity’ element command.