Bridge main cable equivalent temperature calculation method and system based on simplified heat conduction model

By simplifying the heat conduction model and solving the one-dimensional rod heat conduction partial differential equation, the high cost and low efficiency problems of traditional methods in temperature monitoring of suspension bridge main cables are solved, and efficient calculation and real-time analysis of the equivalent temperature of the main cables are achieved.

CN120764016APending Publication Date: 2025-10-10WUHAN INST OF TECH
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Patent Information

Application Number
CN202510855438.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-25
Publication Date
2025-10-10

AI Technical Summary

Technical Problem

In the existing technology of temperature monitoring of the main cables of suspension bridges, traditional methods are high-cost, difficult to implement due to complex boundary conditions, and simplified models cannot adapt to changes in the cross-sectional shape of the main cables, resulting in low computational efficiency and inability to meet the real-time needs of the project.

Method used

A simplified heat conduction model is adopted, and a simplified boundary condition is used. By obtaining the temperature of the measuring points on the main cable surface, a one-dimensional straight rod heat transfer model is established. The eigenfunction method and Laplace transform method are combined to solve the one-dimensional rod heat conduction partial differential equation, and the analytical formula for the equivalent temperature of the main cable section is derived.

Benefits of technology

It achieves efficient calculation of the equivalent temperature of the main cable of the suspension bridge, reduces the difficulty of data collection, simplifies the boundary condition measurement process, improves calculation efficiency, and provides real-time analysis support for the bridge health monitoring system.

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Abstract

The invention provides a bridge main cable equivalent temperature calculation method and system based on a simplified heat conduction model, and the method comprises the steps: inputting the midpoint temperature of each side of a regular polygon cross section of a main cable before cable tightening in a construction period as a simplified boundary condition, directly taking the midpoint temperature as a boundary, simplifying a heat transfer problem, and building a one-dimensional straight rod heat transfer model; a corresponding heat conduction partial differential equation is further established and solved, an analytical calculation formula between the weighted average temperature and the equivalent temperature of the cross section of the main cable is derived, and the function of solving the equivalent temperature of the main cable of the suspension bridge is achieved. According to the method, the boundary temperature, the material parameters and the geometric dimension are incorporated into a unified calculation framework, the calculation complexity is reduced, the calculation efficiency is greatly improved, and the formula is not only suitable for the main cable before cable tightening, but also suitable for the main cable with the circular cross section after cable tightening through finite element analysis verification. And an efficient and reliable technical support is provided for real-time analysis of the temperature effect of the main cable in bridge construction monitoring and a health monitoring system.
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