X-SEA Linear & Nonlinear Element library | X-SEA Nonlinear Material | |

Frame element | XFRAME : 2-node frame element with warping (7 dof, Shear deformation, tapered) |
Elastoplastic : Von Mises, CONCRETE CREEP |
---|---|---|

Shell element | XSHELL3-QSI : 3 node quasi-conforming XSHELL4-ANS : 4 node Assume Natural Strain |
Elastoplastic : Von Mises with strain hardeing, Ivanov-Yulishin, Concrete Elsto-plastic & Elasto-plastic Fracture, laminate composite, Concrete creep |

Solid element | XSOLID4T & XSOLID10T : 4 & 10 node, Tetrahedral XSOLID8-EAS: Enhanced Assumed Strain 8 node | Elasto-plastic : Von-Mises, Mohr-Coulomb, Drucker-Prager, Tresca |

Truss element | XCABLE–Parbolic |
Elastoplastic : Von Mises |

Cable element | XTRUSS : 2-node three dimensional element | 5-point nonlinear model |

Spring element | XSPRING : 3-D Spring | |

Link Element | Gap, Hook, Gap-Hook | |

Interface element | 1-D, 2-D,3-D (Bond-slip element) | |

Tendon element | 3-D prestressing tendon |

Structural Member’s offset

When two or more members are connected with the same joint, there is some overlap of the cross section.

To solve, “member offset” function was applied. Offset member will be divided into 2 parts. Flexible zone and offset rigid zone.

Offset rigid zone will be calculated as rigid and never affect axial and torsional deformation. The rest element is assumed to be frame element deformations.

Truss Element stiffness matrix is calculated in the local coordinate system and transformed into the global coordinate system automatically.

A truss element is structural member capable of transmitting stress only in the direction normal to the cross section.

The normal stress is assumed to be constant over the cross-section area.

The two-dimensionaland thress dimensional truss elements are shown in the X-SEA element library.

The linear and geometrically nonlinear element modules are available.

A three dimensional 2-node frame element can be used for the linear and nonlinear dynamic analysis of 3-D offshore framed structures

- The XFRAME element has a spring and offset for easy and efficient modeling
- Fiber cross section analysis using 8-node element
- Geometrical and Material nonlinear frame element
- Tapered frame element
- Warping analysis of steel cross section of frame element.

Lare displacement elastic and elasto-plastic Analyses of Lee's frame to validate the nonlinear performance

- The formulation of the shell elements use Mindlin-Reissner theory
- Assumed Strain Method and Quasi-Conforming method to remove the shear locking
- Co-rotational formulation in nonlinear analysis
- The thin shell structures.
- Rotation free X-Shell 3 node element is very efficient in memory and CPU time.

Three types of solid dlements are available.

XSolid-4T - 4 node tetrahedron,

XSolid-10T - 10 node tetrahedron,

XSolid-8-EAS - 8 node hexahedron with enhanced assumed strains.

XSolid-shell-8- - 8 node assumed strain and enhanced assumed strains.

- Advantages
- The solid-shell element is analytically integrated through the thickness.
- Computationally efficient element for large concrete structures (more than 50% CPU time saving)
- Section force, moment & stress at node
- The same DOF as shell element but easier and smoother than shell element model in the tapered beam structures
- The calculation of the memberane force, moments and stresses at node by stress smoothing

For the Bond-slip behavior of Grouted Connection, the Interface Element is used for the interface between transition piece and monopile Wind Turbine Offshore Structure.