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CAESAR II Users Guide

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CAESAR II
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CAESAR II Version
13

Specifies the restraint type. You can select a restraint from the list in the Restraints auxiliary panel in Piping Input. For more information, see the Restraints section of the CAESAR II Applications Guide.

Restraint Type

Description

Example

ANC

Anchor

Modifiers:

  • Stiffness

  • Gap

  • Mu

The anchor is at the center of the pipe for a rigid stanchion. Otherwise, the anchor is at the base of the stanchion.

X, Y, or Z

Translational Double Acting

Modifiers:

  • Stiffness

  • Gap

  • Mu

X support

+X, -X, +Y, -Y, +Z, -Z

Translational Directional

Modifiers:

  • Stiffness

  • Gap

  • Mu

The plus or minus sign (+/-) on the restraint specifies the direction of free movement.

+Y support with slide plates

Allows movement in the positive Y direction and restrains movement in the negative Y direction.

RX, RY, or RZ

Rotational Double Acting

Modifiers:

  • Stiffness

  • Gap

1) RZ, X, and Y

2) RX, RY, X, and Y. Hinged-end rod free to rotate about the Z-axis. Restrains all except RZ.

+RX, -RX, +RY, -RY, +RZ, -RZ

Rotational Directional

Modifiers:

  • Stiffness

  • Gap

The plus or minus sign (+/-) on the restraint specifies the direction of free movement.

+RZ, X, and Y

GUIDE

Guide, Double Acting

Modifiers:

  • Stiffness

  • Gap

  • Mu

GUIDE only restricts the pipe’s lateral movement in the horizontal plane and does not contain a vertical component or a pipe axial component.

Guide (or X) and Y

This can also be X instead of GUIDE.

LIM

Double Acting Limit Stop

Modifiers:

  • Stiffness

  • Gap

  • Mu

A limit stop is axial to the pipe but may not align with a global axis when elements are non-orthogonal.

LIM with gap (or X with gap) and +Y

Gap between support and each limit stop

For more information, see Gap.

This can also be X with gap instead of LIM with gap.

+LIM, -LIM

Directional Limit Stop

Modifiers:

  • Stiffness

  • Gap

  • Mu

A limit stop is axial to the pipe but may not align with a global axis when elements are non-orthogonal.

+LIM with gap in the direction of the From node to the To node
(also +Y)

Gap between support and the limit stop

For more information, see Gap.

This can also be +X with gap instead of +LIM with gap.

XROD, YROD, ZROD


+XROD, +YROD, +ZROD,

Large Rotation Rod

Modifiers:

  • Stiffness

  • Length

  • Fi

All rods are directional. If there is no sign it is assumed to be positive.

YROD or +YROD

This can also be +YROD instead of YROD.

-XROD, -YROD, -ZROD

Large Directional Rotation Rod

Modifiers:

  • Stiffness

  • Length

  • Fi

-YROD

X2, Y2, Z2

Translational Double Acting Bilinear

Modifiers:

  • K1

  • K2

  • Fy

X2 soil stiffness with a load limit

For more information, see Stif, K2, and Mu.

+X2, -X2, +Y2, -Y2, +Z2, -Z2

Translational Directional Bilinear

Modifiers:

  • K1

  • K2

  • Fy

The directional restraint allows movement in the specified direction.

RX2, RY2, RZ2

Rotational Double Acting Bilinear

Modifiers:

  • K1

  • K2

  • Fy

RX2, RY2

+RX2, -RX2, +RY2, -RY2, +RZ2, -RZ2

Rotational Directional Bilinear

Modifiers:

  • K1

  • K2

  • Fy

The directional restraint allows rotation in the specified direction about the specified axis.

XSPR, YSPR, ZSPR

Bottom Out Spring

Modifiers:

  • Stiffness

  • x

  • F

YSPR

XSNB, YSNB, ZSNB

Translational Double Acting Snubber

Modifier:

  • Stiffness

YSNB

+XSNB, -XSNB, +YSNB, -YSNB, +ZSNB, -ZSNB

Directional Snubber

Modifier:

  • Stiffness

The directional restraint allows movement in the specified direction.