Development of a software platform for bridge modal and damage identification based on ambient excitation

作     者：Jiahuan Li Li Zhu Wenyu Ji Sunfeng You Jiahuan Li;Li Zhu;Wenvu Ji;Sunfeng You

作者机构：School of Civil EngineeringBejing Jiaotong UniversityBeijing 100044China 

出 版 物：《High-Speed Railway》 (高速铁路（英文）)

年 卷 期：2023年第1卷第3期

页      面：162-170页

学科分类：081406[工学-桥梁与隧道工程] 08[工学] 0835[工学-软件工程] 0814[工学-土木工程] 082301[工学-道路与铁道工程] 0823[工学-交通运输工程] 081202[工学-计算机软件与理论] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

主　　题：Vibration detection Software development Modal identification Damage identification Numerical verification 

摘      要：Modal and damage identification based on ambient excitation can greatly improve the efficiency of high-speed railway bridge vibration *** paper first describes the basic principles of stochastic subspace identification,peak-picking,and frequency domain decomposition method in modal analysis based on ambient excitation,and the effectiveness of these three methods is verified through finite element calculation and numerical simulation,Then the damage element is added to the finite element model to simulate the crack,and the curvature mode difference and the curvature mode area difference square ratio are calculated by using the stochastic subspace identification results to verify their ability of damage identification and ***,the above modal and damage identification techniques are integrated to develop a bridge modal and damage identification software *** final results show that all three modal identification methods can accurately identify the vibration frequency and mode shape,both damage identification methods can accurately identify and locate the damage,and the developed software platform is simple and efficient.