METHOD FOR NON-DESTRUCTIVE TESTING OF THE BEARING CAPACITY OF SINGLE-SPAN BEARERS Russian patent published in 2022 - IPC G01M5/00 G01N3/10 

FIELD: construction.

SUBSTANCE: invention relates to the field of construction and can be used in assessing the category of technical condition of steel girders during the survey of buildings and structures. Essence: the section of the girder with the maximum deflection f₀ from the operational load is identified, where the deflection meter is installed, after which a test concentrated load is applied in this section of the girder. The test concentrated load is applied in 5 consecutive steps of 10% (F₁), 20% (F₂), 30% (F₃), 40% (F₄) and 50% (F₅) of the maximum permissible load per girder. Each stage of the test load is maintained until the values of linear displacements are stabilized, after which the deflection value f_i, i = 1, 2, ... 5 is fixed, at this stage of the test load Fi and the next stage of the test load F_{i + 1} is applied, and after holding the fifth stage of the load, the test load is removed, and the tests are repeated after stabilization of the deflections. Experimental points are set aside on the F-f graph, after which nonlinear functions are selected by the approximation method and , after that, the limit values of deflections are calculated according to various criteria of limit states: according to the strength criterion, according to the stiffness criterion, according to the stability criterion. The maximum concentrated load for each criterion of the limit state is determined graphically or calculated analytically from the equations, after which the lowest value interval of the maximum concentrated load is taken as an estimate of the bearing capacity, after which the interval of the maximum uniformly distributed load on the run through the equality of bending moments from different types of loads is revealed.

EFFECT: improving the accuracy and reliability of the assessment of the bearing capacity of single-span bearers in buildings and structures.

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