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为加强频率响应函数复杂理论研究与工程结构检测评定实践的衔接，实现现役桥梁的低成本、快速评价和进一步的损伤识别。基于结构动力学原理，以简支梁桥为例，贴近工程实践，分别引入截面高度系数和弹性模量系数，表征现役桥梁长期承受车辆荷载可能面临的截面开裂问题，以及受恶劣自然环境、火灾等因素影响可能出现的弹性模量损失问题，建立结构频率响应函数表达式和损伤参数函数表达式，分别用于实施结构固有频率变化规律分析及结构损伤识别研究。研究结果表明：借助外观检测，考虑结构固有频率响应函数即可实现梁板桥的快速评价，结构固有频率的5类划分也有助于与现行检测评定规范5类桥衔接，但位于梁段中间位置的单元损伤对频率影响较大，借助损伤参数函数实施进一步的损伤识别则较为复杂。研究可替代传统基于足尺荷载试验的分析评价方法，降低分析评价成本，减少对桥上通行车辆的不利影响；相关损伤识别方法，也可为机械工程、航空航天工程损伤诊断提供参考。
Abstract：Thelow cost, rapid evaluation and further damage identification of in-service bridge can be realized by strengthening the connection between the complex theoretical research of frequency response function and the practice of engineering structure inspection and evaluation.On the basis of the principle of structural dynamic, the simplysupported girder bridgeis taken as an example. The section height coefficient and the elastic modulus coefficient, close to engineering practice, are introduced to characterize the section cracking problems of in-service bridge subjected to the long-term vehicle load effect and the elastic modulus loss problems of in-service bridge subjected to the adverse natural environment, fire and other factors. The natural frequency response function and damage function expression are obtained.The natural frequency response function and the damage function can be used to analyze the change rule of the natural frequency and identify the damage. Study shows that by taking into account the natural frequency response function with the aid of an appearance inspection, a rapid evaluation of the bridge in service can be realized.The classification into five levels of structural natural frequency is also consistent with the five levels of structural performance of in-service bridge in the current code of inspection and evaluation.The frequency is greatly influenced by the damage to the element in the middle section of the girder. While the further damage identification with damage function is more complicated. By replacing the traditional full-scale load test method, this study can reduce the cost of analysis and evaluation, as well as the negative impact on traffic.For damage diagnosis in mechanical and aerospace engineering, the damage identification method herein can also be a reference.
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基本信息:
DOI：10.19782/j.cnki.1674-0610.2024.06.006
中图分类号:U441
引用信息:
[1]邹顺,贾鹏展,靳启文,等.基于结构动力学频响函数的现役梁板桥实用评价方法[J].公路工程,2024,49(06):35-41+100.DOI:10.19782/j.cnki.1674-0610.2024.06.006.
基金信息:
河南省教育厅高校重点科研项目（24A560005）
2023-08-23
2023
2023-11-28
2024-01-11
2024
1
2024-12-20
2024-12-20