1. CRS8 - Axisymmetric cross section with axial/torsion strain model and hysteresis effects in bending/cuvature relation

1.1. Data group identifier

NEW COMPonent CRS8

1.2. Component type identifier

Identical to input for cross-section type CRS1 , see Component type identifier for CRS1.

1.3. Mass and volume

Identical to input for cross-section type CRS1 , see Mass and volume for CRS1.

1.4. Stiffness properties classification

IEAIGT

  • IEAIGT: integer, default: 1: Axial and torsional stiffness code

    • 1 - constant stiffness

    • N - table with N >= 3 pairs of tension-elongation and moment-rotation to be specified

1.5. Axial stiffness. Case 1, IEAIGT=1

EA

  • EA: real > 0: Axial stiffness \(\mathrm {[F]}\)

1.6. Axial stiffness. Case 2, IEAIGT=N

EAF(1) ELONG(1) . . . EAF(N) ELONG(N)

  • EAF(1): real: Axial force corresponding to relative elongation ELONG(1) \(\mathrm {[F]}\)

  • ELONG(1): real: Relative elongation ()

  • .

  • .

  • .

The pairs of EAF and ELONG must be given in increasing order on a single input line.

um ii fig70
Figure 1. Axial force corresponding to relative elongation

1.7. Bending stiffness properties

1.8. Bending stiffness.

EI MF SF

  • EI: real: Bending stiffness \(\mathrm {[FL^2]}\)

  • MF: real: Internal friction moment, see figure below. \(\mathrm {[FL]}\)

  • SF: real, default: 10.: Internal friction moment stiffness factor. \(\mathrm {[-]}\)

The default value of SF corresponds to the earlier fixed value of 10.0.

um ii fig71
Figure 2. Internal friction moment description

1.9. Torsion stiffness

Constant torsion stiffness. Case 1 IGT=1
GT BETA

  • GT: real > 0: Torsion stiffness \(\mathrm {[FL^2/Radian]}\)

  • BETA: real: Tension/torsion coupling parameter \(\mathrm {[L]}\)

Nonlinear torsion stiffness. Case 2 IEAIGT=N
TMOM(1) TROT(1) BETA(1). . . TMOM(N-1) TROT(N-1) BETA(N-1) TMOM(N) TROT(N)

  • TMOM(1): real: Torsion moment \(\mathrm {[FL]}\)

  • TROT(1): real: Torsion angle/length \(\mathrm {[Radian/L]}\)

  • BETA(1): real: Tension/torsion coupling parameter \(\mathrm {[L]}\)

  • .

  • .

  • TMOM(N-1): real

  • TROT(N-1): real:

  • BETA(N-1): real:

  • TMOM(N): real:

  • TROT(N): real:

TROT and TMOM must be given in increasing order. BETA(1) is constant in the range TROT(1) < = TROT < TROT(2), BETA(2) constant in the range TROT(2) < = TROT < TROT(3) etc. Consequently BETA(N) is not to be specified.

1.10. Damping specification

Identical to input for cross-section type CRS1 , see Damping specification for CRS1.

1.11. Hydrodynamic load types

Identical to input for cross-section type CRS1, see Hydrodynamic load type identification for CRS1.

1.12. Aerodynamic force coefficients

Identical to input for cross-section type CRS1, see Aerodynamic load type identification for CRS1.

1.13. Capacity parameter

Identical to input for cross-section type CRS1, see Capacity parameter for CRS1.