A Novel Approach for Random Field Incorporation in Stochastic Finite Element Simulation of Existing Structures: Application in Marine Structures

The randomness in material properties and degradation mechanisms in existing structures can be considered in structural safety evaluations using random fields. Random fields describe the spatial distribution of a given material property as a function of a predefined set of parameters. Incorporating random fields in nonlinear finite element (FE) simulation, referred to as stochastic FE method (SFEM), is hindered by the lack of practical computer tools that automate random field generation using commercial FE software. The objective of this research is to develop a novel framework and computer script to generate SFEM models using the renowned LS-DYNA FE software. The functionality of the computer script is demonstrated through an example involving SFEM simulations of a reinforced concrete caisson wharf segment subjected to mooring load. A reliability analysis is conducted using the obtained SFEM responses through Monte Carlo simulation. Analysis results indicated the viability of the computer script and the successful representation of random fields in LS-DYNA.