Performance Evaluation of Damaged T-Beam Bridges with External Prestressing Reinforcement Based on Natural Frequencies  

作　　者：Menghui Hao Shanshan Zhou Yongchao Han Zhanwei Zhu Qiang Yang Panxu Sun Jiajun Fan 

机构地区：[1]Henan Zhonggong Design&Research Group Co.,Ltd.,Zhengzhou,450000,China [2]School of Civil Engineering,Zhengzhou University,Zhengzhou,450001,China

出　　处：《Structural Durability & Health Monitoring》2025年第2期399-415,共17页结构耐久性与健康监测(英文)

基　　金：supported by Henan Province Science and Technology Research Funding Project(No.222102320129);the Key Research Project of Henan Higher Education Institutions(Grant Nos.22A560004,22A56005).

摘　　要：As an evaluation index,the natural frequency has the advantages of easy acquisition and quantitative evaluation.In this paper,the natural frequency is used to evaluate the performance of external cable reinforced bridges.Numerical examples show that compared with the natural frequencies of first-order modes,the natural frequencies of higher-order modes are more sensitive and can reflect the damage situation and external cable reinforcement effect of T-beam bridges.For damaged bridges,as the damage to the T-beam increases,the natural frequency value of the bridge gradually decreases.When the degree of local damage to the beam reaches 60%,the amplitude of natural frequency change exceeds 10%for the first time.The natural frequencies of the firstorder vibration mode and higher-order vibration mode can be selected as indexes for different degrees of the damaged T-beam bridges.For damaged bridges reinforced with external cables,the traditional natural frequency of the first-order vibration mode cannot be used as the index,which is insensitive to changes in prestress of the external cable.Some natural frequencies of higher-order vibration modes can be selected as indexes,which can reflect the reinforcement effect of externally prestressed damaged T-beam bridges,and its numerical value increases with the increase of external prestressed cable force.

关 键 词：Performance evaluation natural frequency T-beam bridge DAMAGE external cable reinforcement 

分 类 号：TU375.1[建筑科学—结构工程]