*Node Spring

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*Node Spring

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Purpose

To specify the stiffness and direction of node springs.

Theory

Refer to Spring Elements for further information on this feature.

Keyword Format

One type of line repeated as often as necessary.

Node (Number or Label), DOF, Stiffness

If you specify a node label rather than a node number, it must be enclosed in {} brackets.

Table Input

Input:

Description

Node:

The node (number or label) at which the node spring is located. If you specify a node label rather than a node number, it must be enclosed in {} brackets.

DOF:

The global degree of freedom (DOF) defining the spring line of action. Specify a value of 1 for the global X-direction, 2 for the global Y-direction and 3 for the global Z-direction. A value of 4, 5 or 6 gives a rotational node spring.

Stiffness:

The linear spring stiffness of the node spring in the specified DOF. The dimension of spring stiffness in DOFs 1-3 is force per unit length. The dimension of spring stiffness in DOFs 4-6 is moment per degree rotation.

Notes

(a) The line of action of a node spring remains constant throughout the analysis.