| Abstrakt: |
Development of the construction industry in the world and the very intense construction pace in Romania raise the problem of increasing safety in their exploitation, increasing quality of constructions and of using, for calculation and design, methods, theories and hypotheses which are closest to real behavior of construction elements taken separately and as a whole. In studying interaction between a construction and soil, it is very important to know and to shape foundation soil because soil will take over the tasks by resistance of dispersed environment and it will be deformed. Current evolution stage of research in the field of interaction between structure, foundation and soil of constructions proves the critical importance of this issue to specialists in the field. Various studies carried out until now have used both rigorous analytical models and experimental trials. In the present paper, interaction between foundation and foundation soil will be analysed. For this purpose, according to some analyses on shaping foundation soil, on geotechnical characteristics of various soils, on characteristics of the various types of foundations, on interaction between foundation soil and structure of the constructions, on causes of defects in foundations and on solutions for reinforcing foundations, a case study is developed, where the NASTRAN software is used. Within the paper, we have carried out numerical modelling of current marginal foundation of FOCŞANI VEST Transformation station, by finite element method. Thus, we determined both deformation and tension status in a complex foundation, made up of existing foundation beams and a new foundation of block and lining, as well as behaviour of foundation soil, made up of contractile clay. Modelling was performed under following hypotheses: elastic behaviour of soil, plastic behaviour of soil -Mohr - Coulomb method and the Drucker Prager method. Results of research, materialized in maps of displacements, deformations, tensions, efforts, temperatures, effort diagrams for linear elements, tension status in vectorial form, are extremely useful in design and development process. It is also very important to choose an appropriate mathematic model for foundation soil, which corresponds as much as possible to behaviour reality, taking into account concrete location conditions. Great emphasis is also laid on attention that has to be paid to settling deformability characteristics for soil, because they influence, to a high extent, the results obtained. [ABSTRACT FROM AUTHOR] |
