Full-life power design method for steel-concrete composite beam bridge under action of automobile load

By establishing a finite element model of the bridge and performing random traffic simulation analysis, the problem that traditional design methods cannot accurately predict the fatigue life of the bridge is solved, and high-precision bridge life evaluation and full-life dynamic design are achieved, which extends the service life of the bridge.

CN119720682AInactive Publication Date: 2025-03-28HARBIN INST OF TECH
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Patent Information

Application Number
CN202411904990.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-23
Publication Date
2025-03-28
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

Traditional design methods cannot effectively consider the stress accumulation effect of traffic volume changes on steel-mixed combination beam bridges, making it difficult to accurately predict the fatigue life of the bridge, affecting the durability and life of the bridge.

Method used

By establishing a finite element model of bridges that considers material, boundaries and geometric nonlinearity, random vehicle flow simulation and nonlinear dynamic time-course analysis, the structural reliability of the bridge under the action of automobile loads is calculated, and high-precision prediction of bridge life is achieved.

Benefits of technology

It improves the accuracy and efficiency of bridge life evaluation, can dynamically consider future traffic changes, significantly extend the full life of steel-mixed combination beam bridges, and ensures high reliability of bridge structures under complex traffic loads.

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Abstract

The invention discloses a full-life power design method for a steel-concrete composite beam bridge under the action of an automobile load, and relates to the technical field of bridge life evaluation. The method comprises the following steps: establishing a bridge finite element model according to a design drawing, simulating a random traffic flow, performing nonlinear time-history analysis by taking a contact position of a midspan section web and a lower flange plate as a stress attention part, selecting equivalent stress amplitude and a stress cycle index as random vectors, determining a probability density distribution function, selecting an initial point set, and reforming the point set. And determining a bridge fatigue damage performance function, solving to obtain a time-varying probability density function considering uncertainty, calculating reliability, and obtaining a bridge reliability curve graph under the automobile load according to the reliability under continuous time. By establishing a bridge finite element model, bridge nonlinear dynamic time history analysis under the consideration of vehicle action uncertainty is carried out, the structural reliability of a bridge along with the change of the service life under the action of an automobile load can be quickly and accurately calculated, and the service life prediction of the bridge is realized.
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