Specifies preintegrated section mass matrix for composite-beam sections.
Row number of the matrix.
C(R)(R), . . . ,
Upper triangle of the cross-section mass matrix [C].
With a unit beam length, the section mass matrix relates the resultant forces and torques to accelerations and angular accelerations as follows (applicable to the local element coordinate system):
The CBMD command, one of several composite beam section
commands, specifies the section mass matrix (submatrix
for a composite beam section. The section data defined is associated
with the section most recently defined (SECTYPE) at the specified temperature (CBTMP).
Unspecified values default to zero.
For complete information, see Using Preintegrated Composite Beam Sections.