Method for evaluating anti-collision toughness of rusted steel bar bridge structure after ship collision

By establishing a finite element model of rusted reinforced concrete and combining the equivalent static method and response surface agent model, the problem of inaccurate ship collision assessment after rust on coastal bridges is solved, and scientific evaluation and safety guarantee of bridge collision toughness is achieved.

CN120493657AActive Publication Date: 2025-08-15EAST CHINA JIAOTONG UNIVERSITY
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Patent Information

Application Number
CN202510942132.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-09
Publication Date
2025-08-15
Estimated Expiration
2045-07-09

AI Technical Summary

Technical Problem

When coastal bridges are prone to rust and are hit by ships, the existing technology lacks accurate collision toughness evaluation methods, resulting in inaccurate assessment and lack of quantitative basis, which cannot effectively ensure the safe operation of bridges.

Method used

Based on the theoretical degradation model of rusted reinforced concrete, a finite element model was established, and a ship impact was simulated with the equivalent static method, and nonlinear static and dynamic analysis was carried out, and a response surface agent model was constructed to predict the dynamic response, determine the damage state and calculate the repair time, and quantify the impact toughness of the bridge.

Benefits of technology

Accurate simulation and quantitative assessment of the impact toughness of the ship after collision in the corroded bridge structure is achieved, scientific basis is provided, guidance is provided for bridge safety assessment and maintenance decision-making, and safety risks are reduced.

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Abstract

The invention relates to the technical field of traffic infrastructure maintenance, and particularly discloses a method for evaluating the anti-collision toughness of a rusted steel bar bridge structure after ship collision, and the method comprises the following steps: firstly, building a rusted bridge pier finite element model based on a rusted steel bar concrete theoretical degradation model; simulating ship collision by adopting an equivalent static method, and determining dynamic damage factors of the ship; structural nonlinear static analysis and nonlinear dynamic analysis are conducted by considering sudden external force to obtain a bridge function loss function, and then a bridge function is calculated; constructing a response surface agent model to perform dynamic response prediction; determining a bridge structure damage state judgment criterion; the vulnerability of the rusted bridge is calculated through Monte Carlo simulation; and according to the bridge function loss function, combining the repair time and the recovery function to calculate a structure anti-collision toughness index. The method provided by the invention fills up the blank of ship collision resistance toughness evaluation of the coastal rusted bridge pier, provides a scientific basis for bridge safety evaluation and maintenance decision, and is of great significance for guaranteeing safe operation of the bridge.
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