structure dynamic command

Syntax

structure dynamic damping keyword ... <range>

Primary keywords:

combined-local    local    none    rayleigh

Set the structural element logic damping scheme for dynamic analysis. The following keywords are available:

combined-local f1

sets the damping scheme used by the structural element logic to combined-local damping. The local damping factor is f1.

local f1

sets the damping scheme used by the structural element logic to local damping. This is the default setting for static mode. The local damping factor is f1.

none

sets the damping scheme used by the structural element logic to no damping. This is the default setting for dynamic mode.

rayleigh f1 f2

sets the damping scheme used by the structural element logic to Rayleigh damping. The stiffness-proportional constant is f1 = beta, and the mass-proportional constant is f2 = alpha. This command must be used when the dynamic option is configured and turned on.