Rapid bridge detection method based on influence lines

Abstract

The invention relates to a rapid bridge detection method, which belongs to the technical field of civil engineering application. Firstly, a loading test vehicle with known axle load and wheelbase is adopted for loading to measure response of a test point; then, a method of adopting a specific function (piecewise polynomial and sine wave stacking) to fit the dynamic response of the test point is adopted to extract influence line information of the bridge; a tire-pavement stress distribution emprical formula is introduced to build a tire-pavement contact force trapezoid distribution model; in combination of the actual influence line information and the vehicle tire-pavement contact force distribution model, a linear superposition method is adopted to reconstruct bridge test point response information under different vehicle load combination effects, and thus, rapid bridge detection based on the influence lines is realized. Based on few driving tests on a single vehicle, the actual influence line information can be acquired rapidly and accurately, the bridge response information under different static load combination working conditions is reconstructed, rapid bridge detection is achieved, and the defects that the existing bridge detection method is long in consumed time, high in economic cost and long in traffic block time can be solved.

Description

technical field [0001] The invention relates to a rapid bridge detection method based on influence lines, belonging to the technical field of civil engineering applications. Background technique [0002] The response of the bridge structure is a function related to its basic physical parameters. Once its bearing capacity degrades, the physical parameters will inevitably change accordingly, so that the structural response under the same load will also change. Through the analysis and comparison of the measured response and theoretical calculation results, we can accurately understand the actual operating status of the bridge, and judge its safety and reliability. [0003] Commonly used bridge bearing capacity evaluation methods such as the static load test method apply a static load equivalent to the maximum design load value (such as: multiple vehicle loads) to a designated position on the bridge, and then evaluate the displacement, strain, and crack width of the bridge stru...

AI Technical Summary

Problems solved by technology

[0005] There are many test conditions in the existing bridge detection method, which takes a long time, may lead to traffic blockage for a long time, the requirements for the test environment are relatively strict, and the development cost is relatively high.

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