Steel Structural Analysis & Design (Code Checking)

X-SEA software is supporting Major rules and standards as following design code.



After in-place analysis, the member force and moments can be checked from the various design code and printed by the colorful unit value.

Stress ratio of Jacket Structure

Solutions of Linear & Nonlinear Dynamic Analysis

Dynamic Time-history analysis

  • - Explicit method: Central difference
  • - Implicit method: Newmark-beta, Wilson-theta and HHT

Mode superposition method for linear dynamic analysis with damped and undamped system

  • - Eigenvector
  • - LD Ritz vector

Hydrodynamic analysis

  • - Morison equation for the offshore steel framed structures
  • - Diffraction theory for the large offshore structures such as the concrete gravity and huge floating structures.
Time history earthquake analysis and seismic code spectrum

Impact dynamic analysis

  • - Impact dynamic analysis of large deformation elasto-plastic analysis can be carried out.

Automatic Generation Time History function

Ship Impact Analysis

Fully Coupled Analysis of Offshore Wind Turbine structures

In the analysis and design of offshore wind turbine support structure, engineers need a solution for the coupled analysis of wind turbine and hydrodynamic loads on structures. In X-OpenFAST, fully coupled analysis of offshore wind turbine structure can be carried out using a high performance graphical input of OpenFAST 3.0.

REF: E. Branlard, M. Shields, B. Anderson, R. Damiani, F. Wendt, J. Jonkman, W. Musial, National Renewable Energy Laboratory,Superelement reduction of substructures for sequential load calculations in OpenFAST, NAWEA WindTech 2019 Journal of Physics: Conference Series 1452 (2020) 012033 IOP Publishing

Solutions of X-SEA Seismic Analysis

Static Analysis

The peak acceleration from the response spectrum is applied as a lateral force distributed along the structure. The seismic static coefficients are usually obtained from the seismic “zone”, which is corresponding to a level of seismic acceleration. X-SEA programs can perform static analysis using the load case of response spectrum.

Pushover Analysis the fiber-based finite elements

Pushover analysis is a nonlinear static procedure to estimate seismic structural deformations and commonly used to evaluate the seismic capacity of existing structures. It can also be useful for performance-based design of new structure that rely on ductility or redundancies to resist earthquake forces.

A fiber element model is thought to capture more accurate response effects than plastic hinge model. Geometrical and material properties are the only required ones as input. Geometrical and Material nonlinearity effects are taken into account.

Time History Analysis

The method of linear time history analysis provides an actual solution of the dynamic equation of motion. Time history analysis is a more accurate and computationally intensive method than response spectrum analysis.

  • - Time-discretized record text format data:
  • - Time- history function data

Recorded Data

Spectrum Curve data

Post-processing ULS & FLS from GH-Bladed & OpenFAST

Post-processing the integrated design results for ULS (Ultimate Limit State) and
FLS(Fatigue Limit State) from GH-Bladed and OpenFAST.

GH-Bladed: FLS & ULS

FLS Input


ULS Input