Concrete bridge prestress and bridge deck load collaborative inversion method

Abstract

The invention discloses a concrete bridge prestress and bridge deck load collaborative inversion method which comprises the following steps: 1) analyzing a rigidity matrix of a prestressed beam through a model, extracting a geometric rigidity matrix containing prestress information and converting the geometric rigidity matrix into a virtual load; 2) in the finite element model, applying a unit pulse load to excitation positions of a bridge deck load and a virtual load, and calculating a bridge pulse response matrix through finite element simulation; 3) arranging displacement and rotation anglesensors on the axis of the concrete main beam along the bridge direction, carrying out load excitation test on the bridge, synchronously acquiring the vibration response of the beam, and establishingan identification equation by utilizing the simulated pulse response matrix and the measured vibration response; 4) solving and identifying the virtual load and the bridge deck load by using a constructive shape function method; and 5) reconstructing the prestress through the identified virtual load and the measurement response. According to the invention, the problems of monitoring of the internal prestress of the concrete beam body and the bridge deck load are solved with low cost and high precision.

Description

technical field [0001] The invention belongs to the technical field of structural health monitoring, and in particular relates to a collaborative inversion method for concrete bridge prestress and bridge deck load. Background technique [0002] During the service period of prestressed concrete bridges, unfavorable factors such as environmental erosion, material aging, long-term load effects, fatigue effects and mutation effects are coupled with each other, and prestress loss will inevitably occur, thereby reducing its ability to resist natural disasters and even normal environmental influences , in extreme cases may lead to catastrophic accidents. Not only that, a large number of overweight trucks brought continuous, random and over-limit load pressure to the bridge, which accelerated the damage of the prestressed structure. Therefore, the accurate identification of prestressed and bridge deck loads has become the most important thing in health monitoring of prestressed bri...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the difficult problem of low-cost and high-efficiency monitoring of prestress and bridge deck load in existing prestressed bridges, a collaborative inversion method for concrete bridge prestress and bridge deck load is proposed. With high accuracy, it solves the problem of monitoring the prestress in the concrete beam body and the bridge deck load at the same time. This method can reflect the bridge load and residual prestress of the bridge prestressed bridge in real time, and provide timely early warning for overloaded vehicles and lack of prestress. Bridge Health Monitoring

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