METHOD FOR DETERMINING THE BEARING CAPACITY OF A SPAN Russian patent published in 2022 - IPC G01M7/00 G01B21/00 

FIELD: non-destructive testing methods.

SUBSTANCE: invention relates to methods for non-destructive testing of the bearing capacity of building structures, in particular to methods for monitoring the bearing capacity of superstructures of road bridges. The method consists in the fact that initially the test load is placed behind the bridge span, after which the seismic vibration sensors in the middle part of the span measure the frequency of natural oscillations, after which measurement cycles begin, in each of which the test load is moved along the span from one support from speed, excluding dynamic fluctuations of the span structure. At the same time, the angular displacements of the span are continuously measured and at the end of the measurement cycle they are recorded, then the indicated cycles are repeated with a set step until the center of gravity of the test load reaches the middle of the span, while the actual linear weight q_ow and the bending moment from its own the weight of the superstructure M_ow, taking into account the coefficient β, taking into account the continuity of the span, and the fixed angular displacements calculate the deflection f in the middle of the span, the stresses in the lower and upper edges of the span from the test load, taking into account the coefficient α, which depends on the position of the neutral axis of the cross section of the span. Next, the bending stiffness EI is calculated in the middle of the span, taking into account the actual operational state, moments of inertia I and resistance W in the upper and lower edges of the span, stresses due to its own weight , , then the total stresses σ^s, σ^u are compared with the calculated values of the materials of the upper and lower edge R^l, R^u, and deflection f with allowable deflection [f_add].

EFFECT: reduction of labor intensity in determining the bearing capacity of the span.

5 cl, 3 dwg