structure link property command

Syntax

structure link property keyword ... <range>

Primary keywords:

x    y    z    rotation    rotation-x    rotation-y    rotation-z

Set a property of a deformable force-displacement model in the link at the degree-of-freedom specified in keyword. A list of properties available to each link constitituve model is found in Structural Element Link Properties.

x <[linkpropertyblock]>

Set the translational \(x\)-direction, also degree-of-freedom 1.

y <[linkpropertyblock]>

Set the translational \(y\)-direction, also degree-of-freedom 2.

z <[linkpropertyblock]>(3D ONLY)

Set the translational \(z\)-direction, also degree-of-freedom 3.

rotation <[linkpropertyblock]>(2D ONLY)

Set the rotational also degree-of-freedom 3

rotation-x <[linkpropertyblock]>(3D ONLY)

Set the rotational \(x\)-direction, also degree-of-freedom 4.

rotation-y <[linkpropertyblock]>(3D ONLY)

Set the rotational \(y\)-direction, also degree-of-freedom 5.

rotation-z <[linkpropertyblock]>(3D ONLY)

Set the rotational \(z\)-direction, also degree-of-freedom 6.

Keyword Block

The following keywords refer to property names available in one or more link constitutive model. The data type used as property values will vary. In general it will be a single real value, but it may be more than one value, or it may be another type entirely. The available property names are: rotation, rotation-x, rotation-y, rotation-z, x, y and z.

area f

The area associated with the link connection. The default value is 1.0. This value applied to all current deformable link models.

cohesion f

Limiting force per unit area, when confining stress is zero. The default value is 0.0. This value applies to the shear-yield and pile-yield models.

cohesion-table s

Name of a table used to relate cohesion to relative displacement. The default value is null, indicating table lookup of cohesion is inactive. This value applies to the shear-yield model.

confinement-table s

Name of a table used to relate a confinement adjustment factor to the amount of shear in the confining stress. The default value is null, indicating table lookup of confinement is inactive. This value applies to the shear-yield model.

for-structure-type s

For structure type, the input can be “cable”, “pile”, “geogrid”, or “liner”. For a manually created deformable link that the confining stress is in calculation, this property must be assigned. Otherwise, the confining stress will not be correctly transferred from the target zone to the link. The links of the target node should be the compatible structure types.

friction f

Friction factor (\(= \tan{\phi}\), where \(\phi\) is the friction angle) that modifies the limiting force as a function of confining stress. The default value is 0.0. This value applies to the shear-yield and pile-yield models.

friction-table

Name of a table used to relate friction to relative displacement. The default value is null, indicating table lookup of friction is inactive. This value applies to the shear-yield model.

gap b

Flag indicating that gap tracking will affect behavior. The default value is off. This value is applied to the normal-yield and pile-yield models.

incremental-confinement-flag

Flag indicating incremental confinement - confinement will be calculated as a difference from the initial stress state. The default value is off. This value applies to the shear-yield model.

perimeter f

The effective perimeter of the structure connected to the link for the purposes of calculating properties. The default value is 0.0 This value applies to the shear-yield model.

stiffness f

The stiffness of the spring. The default value is 1.0. This value applied to all current deformable link models.

yield-compression f

The limiting negative value of force, generated by negative relative displacement (target to source). This value applies to the normal-yield model.

yield-tension f

The limiting positive value of force, generated by positive relative displacement (target to source). This value applies to the normal-yield model.