METHOD TO DETERMINE ULTIMATE LIMIT STATE OF BUILDING STRUCTURES Russian patent published in 2011 - IPC G01N29/14 

FIELD: construction.

SUBSTANCE: method includes placement of acoustic emission sensors, recording a flow of acoustic emission signals parametres, formation of samples, definition of statistic parametres and assessment of structure state according to variation of acoustic emission parametres. At that the acoustic emission sensors are installed on a concrete structure surface, and parametres are recorded in process of damages accumulation, main statistic parametres of acoustic emission and normalised entropy are defined in each sample, and their numerical values are used to build a linear dependence, specific for a zone that corresponds to appearance of cracks in the structure with opening width from 0.3 to 0.5 mm, and whenever its angle of inclination changes by 90° and more, the ultimate limit state of the structure is detected.

EFFECT: making it possible to analyse accumulation of damages in process of operation and detection of the structure ultimate limit state.

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