US 2025/0085186 A1 · METHOD AND SYSTEM FOR QUANTITATIVE DAMAGE MONITORING OF REINFORCED CONCRETE STRUCTURE

Abstract

The present disclosure relates to a method and system for quantitative damage monitoring of a reinforced concrete structure and belongs to the technical field of civil engineering. The method includes: obtaining an optical fiber strain signal and cross-section design parameters of a longitudinal tensile reinforcement of a reinforced concrete beam (101), where the cross-section design parameters include geometric parameters and material performance parameters; the geometric parameters include a cross-section width, a cross-section height, an equivalent cross-section height, a protective layer thickness, and a reinforcement area; establishing a cross-section analysis model based on the cross-section design parameters (102), where the cross-section analysis model includes a concrete damage stress-strain relationship model and a reinforcement damage stress-strain relationship model; and inputting the optical fiber strain signal to the cross-section analysis model to obtain a damage indicator and a bending moment-curvature curve of each cross-section (103).

A method for quantitative damage monitoring of a reinforced concrete structure, comprising:

obtaining an optical fiber strain signal and cross-section design parameters of a longitudinal tensile reinforcement of a reinforced concrete beam, wherein the cross-section design parameters comprise geometric parameters and material performance parameters;
the geometric parameters comprise a cross-section width, a cross-section height, an equivalent cross-section height, a protective layer thickness, and a reinforcement area;
and the material performance parameters comprise a compression peak stress of concrete, an initial tangent modulus of concrete, and an initial tangent modulus of a reinforcement;
establishing a cross-section analysis model based on the cross-section design parameters, wherein the cross-section analysis model comprises a concrete damage stress-strain relationship model and a reinforcement damage stress-strain relationship model;
and
inputting the optical fiber strain signal to the cross-section analysis model to obtain a damage indicator and a bending moment-curvature curve of each cross-section;
monitoring damage indicators and mechanical properties of a key member of the reinforced concrete structure in real-time, so as to guarantee and guide a maintenance and a first-aid repair of the key member of the reinforced concrete structure according to the damage indicator and the bending moment-curvature curve of each cross-section;
wherein the inputting the optical fiber strain signal to the cross-section analysis model to obtain a damage indicator and a bending moment-curvature curve of each cross-section specifically comprises:
setting a position of a neutral axis of an xth cross-section at a time t as y0,x(t);
calculating based on the cross-section design parameters, the optical fiber strain signal, and the position of the neutral axis, a curvature of the xth cross-section at the time t by a formula ϕx(t)=εci,x(t)/(y0,x(t)−d), wherein ϕx(t) represents the curvature of the xth cross-section at the time t;
εci,x(t) represents the optical fiber strain signal;
and d represents the equivalent cross-section height;
calculating, based on the curvature, a strain distribution of concrete fibers of the xth cross-section at the time t and a strain distribution of compressive reinforcement fibers of the xth cross-section at the time t,
calculate, based on the strain distribution of the concrete fibers of the xth cross-section at the time t, a stress distribution and a damage indicator of the concrete fibers of the xth cross-section at the time t using the concrete damage stress-strain relationship model;
calculating, based on the strain distribution of reinforcement fibers of the xth cross-section at the time t, a stress distribution and a damage indicator of the reinforcement fibers of the xth cross-section at the time t using the reinforcement damage stress-strain relationship model, wherein the strain distribution of the reinforcement fibers of the xth cross-section at the time t comprises a strain distribution of tensile reinforcement fibers of the xth cross-section at the time t and the strain distribution of the compressive reinforcement fibers of the xth cross-section at the time t;
calculating a resultant force of axial forces based on the stress distribution and the damage indicator of the concrete fibers of the xth distribution at the time t and the stress distribution and the damage indicator of the reinforcement fibers of the xth distribution at the time t;
determining whether the resultant force of the axial forces is zero;
if the resultant force of the axial forces is zero, calculating and outputting the damage indicator and the bending moment-curvature curve of the xth cross-section at the time t, and
if the resultant force of the axial forces is not zero, returning to “setting a position of a neutral axis of the xth cross-section at a time t as y0,x(t)”.

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Method and system for quantitative damage monitoring of reinforced concrete structure

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Method and system for quantitative damage monitoring of reinforced concrete structure

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Abstract

Claims8