Modal analysis of coupled soil-structure systems

This paper presents an efficient approach for the modal analysis of coupled soil-structure systems, which dynamic response is strongly influenced by embedment in soil. The methodology based on a finite element-perfectly matched layer model that allows derivation frequency-independent system matrices and computation properties system. achieved solving nonlinear eigenproblem using Compact Rational Krylov (CoRK) eigensolver. A procedure developed to sort computed eigenpairs, filter out spurious modes are related near-field truncated far-field soil subdomains select physical structural proposed method can be used assessment identification systems such as fully or partially buried structures interpretation experimentally identified these especially presence highly damped closely spaced modes. applicability scalability 2D 3D problems demonstrated two case studies.