Scilab-based reliability analysis of 5-storey offshore jacket structure using monte carlo finite element method

Monte Carlo Finite Element Method (MCFEM) is a robust reliability analysis method for complex structures which do not have an explicit performance function. This method is a combination of Finite Element Method and Direct Monte Carlo Simulation in an open source software environment (Scilab). MCFEM performance has been well proven for the reliability analysis of 2d truss, 3d truss, 2d frame and a simple real offshore jacket structure (APN-A Offshore jacket). This paper will demonstrate Scilab based MCFEM to analyze 5-storey offshore jacket structure which has 120 number of tubular members in 155,6 feet water depth. The failure mode is based on global analysis by using computed normal stress compared with their buckling strength. Randomization will be done in element level for some significant variables. Reliability of jacket will be represented by the smallest reliability of member. This analysis and all of the previous reliability analysis based on open source software, are important steps toward the establishment of "Reliability Based Structural Analysis" capability which belongs to Ocean Engineering Department, ITS, Indonesia.