METHOD FOR CONTROLLING STIFFNESS OF SINGLE-SPAN BEAMS MADE OF PHYSICALLY NONLINEAR MATERIAL Russian patent published in 2015 - IPC G01N3/20 G01N3/32 

FIELD: construction.

SUBSTANCE: invention relates to the field of construction and is intended to control the stiffness of beams, made of a material, having physically non-linear properties (in particular, reinforced concrete beams), and loaded uniformly by a distributed load. According to the declared method the reference structure is made of a physically nonlinear material for a certain type of beams in compliance with all the technological requirements for quality. The basic or the first resonant oscillation frequency ω₀ is determined in the mentioned structure. The structure is loaded by a stepwise uniformly increasing distributed load, maximum deflection w₀ is measured at each stage of loading, and an approximating function $${\omega }_0^{2}m{w}_0/q=K\left(q\right).$$ is built according to the results of tests of the reference beam. Value of the K parameter, corresponding to the specified test load q₀, is determined by this dependence when controlling the stiffness of serially manufactured beams of a certain type.

EFFECT: expansion of technological capabilities of non-destructive testing method for the stiffness of beams made of a material, having physically nonlinear properties.

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