Single-Directional Restraints - CAESAR II - Reference Data

CAESAR II Applications Guide (2019 Service Pack 1)

PPMProduct
CAESAR II
PPMCategory_custom
Reference Data
Version_CAESAR
11.0 (2019)

The following are some important facts pertaining to single-directional restraints:

  • The plus or minus sign (+/-) on the single-directional restraint gives the direction of free movement. For example, a positive Y restraint (+Y) can move freely in the positive Y-direction and is restrained against movement in the negative Y-direction.

  • Single-directional restraints can define restraint along positive, negative, or skewed axes.

  • Any number of single-directional restraints can act along the same line of action. If more than one single-directional restraint acts along the same line of action, then there are usually two in opposite directions and are used to model unequal leg gaps.

  • A CNode is the connecting node. If you do not define a value for CNode, then the restrained node is connected using the restraint stiffness to a rigid point in space. If you enter a value for CNode, then the restrained node is connected using the restraint stiffness to the connecting node.

  • You can specify friction and gaps with single-directional restraints. The gap is in the opposite direction of the free travel.

The plus or minus sign (+/-) on the restraint gives the direction of free movement. Because the stiffness is omitted, the restraint is rigid.