Gretskykh S. The weakening of the static geomagnetic field by the ferromagnetic elements of houses

The object of research - the magnetic field of ferromagnetic steel structural elements of buildings,the inductively magnetized by the static geomagnetic field. The purpose of research - the physical and mathematical modeling of the phenomenon of weakening of the static geomagnetic field (GMF) near the ferromagnetic elements of houses and to the development of recommendations on how to normalize it to a safe level. The methods of research - the method of equivalent charges, the finite element method, method of the effective magnetic permeability. Numerical modeling was carried out in programming environments of FORTRAN and COMSOL Multiphysics 3.4. The theoretical and practical results: defined the nature of the effect of reinforced concrete structural elements of sizes relations homes and the value of the magnetic permeability of the material elements of the intensity weakening GMF near their surfaces. The recommendations on methods of normalization of GMP in the premises for the design and construction of modern apartment buildings with reinforced concrete columns and floor slabs are developed, the implementation of which will ensure safe conditions in the static of the GMF, which is weakened by not more than 10% of the natural. The scientific novelty: for the first time, to solve the problem and obtained analytically depending on the calculation of the static geomagnetic field, weakened ferromagnetic cylindrical column using the method of equivalent charges; the method of effective permeability of the system of ferromagnetic bodies located in a nonmagnetic medium, for calculating the induction static geomagnetic field a weakened concrete elements construction of houses, the reinforced steel rods was further developed; the first time it is determined that the value of relative magnetic permeability of the steel reinforcement of reinforced concrete structures of the material in which the intensity of the weakening of the geomagnetic field in the areas of modern high-rise buildings will not exceed a safe level of 10% must not exceed 70 units. The degree of implementation - basic research and practical developments used in the engineering firm of "AVUAR" (Kharkov) in the design and construction of modern frame-monolithic blocks of flats with comfortable living conditions; at the Institute of Hygiene and Medical Ecology. AN Marzeev Academy of Medical Sciences of Ukraine (Kyiv) in the development of the new edition of the normative document "State sanitary rules and regulations protect the public from exposure to electromagnetic radiation" in part hypogeomagnetic field. The field of application - in academia, technical and medical profile, building research and design institutions and enterprises, metallurgical research institutions and industrial enterprises.