AN ALGEBRAICALLY PARTITIONED FETI METHOD FOR PARALLEL STRUCTURAL-ANALYSIS - ALGORITHM DESCRIPTION

An algebraically partitioned FETI method for the solution of structura l engineering problems on parallel computers is presented. The present algorithm consists of three attributes: an explicit generation of the orthogonal null-space matrix associated with the interface nodal forc es, the floating subdomain rigid-body modes computed from the subdomai n static equilibrium equation of the classical force method and the id entification of redundant interface force constraint operator that ema nates when the interface force computations are localized. Comparisons of the present method with the previously developed differentially pa rtitioned FETI method are offered in terms of the saddle-point formula tions at the end of the paper. A companion paper reports implementatio n details and numerical performance of the proposed algorithm. (C) 199 7 by John Wiley & Sons, Ltd.