METHOD FOR DETECTION OF HORIZONTAL SEAM RIGIDITY IN DOUBLE-LAYER STRUCTURES OF BEAM TYPE Russian patent published in 2010 - IPC G01N3/32 

FIELD: construction.

SUBSTANCE: method for detection of coefficient of horizontal seam rigidity in double-layer structure of beam type consists in installation and fixation of structure on bench, its loading, measurement of physical parametres that characterise deformed condition of structure, and analytical calculation of rigidity coefficient of horizontal seam. At the same time in structure that is hingedly supported at the ends, with the help of mechanical impact or sudden removal of load, own transverse oscillations are excited at the main frequency, or forced oscillations at the first resonant frequency, according frequency of oscillations is measured, value of parametre λ is calculated from equation where m is linear mass of beam, ℓ is beam span, where E_j is module of material elasticity, A_i, I_i - area of cross section and moment of inertia of each beam layer accordingly, c - distance between centres of gravity of layers of composite beam, and parametre λ is used to calculate value of rigidity coefficient of horizontal seam from expression ξ= λ²/y, where

EFFECT: possibility to apply the invention to lengthy structures, also the ones installed in a facility.

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