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Section 5
5-161
5.27.5 Spring Tension/Compression Specification
Purpose
This command may be used to designate certain support springs as
Tension-only or Compression-only springs.
General Format:
SPR
ING TENSION
joint – list spring-spec
SPR
ING COMPRESSION
joint – list spring-spec
*
⎧KFX ⎫
spring-spec =
⎨KFY ⎬
⎪KFZ ⎪
⎩
ALL
⎭
Description
Tension-only springs are capable of carrying tensile forces only.
Thus, they are automatically inactivated for load cases that create
compression in them. Compression-only springs are capable of
carrying compressive forces only. Thus, they are automatically
inactivated for load cases that create tension in them.
See Section
1.9
If no spring spec is entered or ALL is entered then all translational
springs at that joint will be tension (or compression) only. This
input command does not create a spring, only that if a support
spring exists at the joint in the specified direction then it will also
be tension (or compression) only. See Section 5.27.1 to 5.27.3 to
define springs.
For compression only springs the ALL parameter has special
meaning. The compression only spring is in the Y direction; the X
and Z direction springs are bi-directional. However when the Y