Custom Restraint Modeling in PASS/START-PROF

Learn more about PASS/START-PROF pipe stress analysis software

Example 1: Rigid Rod Hanger

Model a rigid rod hanger with pendulum effect. The hanger disengages during upward pipe displacement.

Example 2: Fixed Anchor

Restrain all six degrees of freedom (three translations and three rotations).

Example 3: Guided Support

Restrain transverse and vertical displacements. Allow longitudinal movement. Include friction coefficients: 0.3 for side surfaces and 0.1 for horizontal surfaces (roller friction).

Guided support without rotational restraints, different friction factors:

Guided support with rotational restraints (excluding torsion), uniform friction factors:

Example 4: Variable Spring with Friction

Example 5: Guided Support with Gaps

Support disengages during upward displacement. Left gap: 10mm, right gap: 15mm. Friction coefficients: 0.3 horizontal, 0.4 vertical.

Without side contact: functions as simple support. With side contact: functions as guided support.

Example 6: Pipe Through Rectangular Opening

Initial pipe position: 20mm and 30mm horizontal clearance, 10mm and 15mm vertical clearance from opening walls.

Restraint behavior scenarios:

• Scenario 1: No wall contact. Zero reactions, no friction

• Scenario 2: Contact with bottom wall. Horizontal surface friction (μ=0.2)

• Scenario 3: Contact with side wall. Vertical surface friction (μ=0.3)

• Scenario 4: Corner contact. Combined vertical (μ=0.3) and horizontal (μ=0.2) friction