In this paper, a general structure of a recently developed object oriented finite element code is presented. The aim of the described object oriented environment is not only to be an efficient and robust tool for FEM computations, but also to provide a nodular and extensible tool for new development. The main reasons which lead to the development of the new general environment for a complex finite element computations, are discussed. The principal requirements for new FEM code are formulated. The program structure has been designed to meet all natural requirements for modularity, future extensibility, and overall robustness. The attention in this paper is put on an overall description of the program design, and particularly, to the description of representations of the general material model-element frame and the analysis module. The presented program structure design has been successfully implemented. The environment itself is not intended to provide any capability to solve a particular problem, instead, it provides a general common framework. Several specialized modules have been developed on the top of this environment, implementing the problem specific parts.

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