基于输出振动数据的桥梁结构损伤识别及试验研究
发布时间：2024-01-03 20:11
桥梁这类基础设施在城市生活中起着重要的作用,并且在其运营期内会受到外部各种环境和荷载的作用及影响。结构健康监测(Structural Health Monitoring,简称:SHM)就是一种对结构进行各种物理参数和响应的监测分析、并给出预警控制及结构安全性评估的工具。在结构健康监测中,有时要准确检测施加在桥上的荷载及时间历程是不可能的,例如,有着高流量交通的高速公路桥梁。当作用在结构上完整的激励不可知时,可以使用基于纯输出的结构振动响应信号进行模态识别和损伤探测。本文提出了三种基于纯输出结构振动响应信号进行损伤检测的方法,其原理是基于结构的加速度数据或其他响应进行信号处理和分析来确定结构的损伤及损伤定位。这些加速度数据可以从数值模型或实际桥梁测试工作中获得。由于加速度计非常便宜且易于实施,故采用这三种方法进行损伤识别可以大大降低结构健康监测的成本和时间。第一种方法为移动平均滤波器法(MAF),它是一种基于纯输出振动信号且无需初始完好状态或基准的损伤识别方法,可用于在移动载荷下通过测定结构的动力响应输出从而定位钢梁中的损伤。MAF是一种基于简单滤波器内核(矩形形状)的卷积方法,其主要通...
【文章页数】：156 页
【学位级别】：博士
【文章目录】：
致谢
摘要
Abstract
1 Introduction
1.1 Background and motivation of research
1.2 Outline of research
2 Literature reviews
2.1 The concept of damage detection
2.2 Different techniques used in damage detection
2.2.1 Frequency based damage detection methods
2.2.2 Mode shapes based and mode shape curvatures based damage detection methods
2.2.3 Dynamic measured flexibility based damage detection method
2.2.4 Model updating based damage detection method
2.2.5 Signal processing based damage detection methods
2.3 Operational modal analysis (Output-only analysis)
2.4 Damage detection without using modal parameters
2.5 Signal correction
2.6 Conclusions
3 Theory and methodology of moving average filter based SHM
3.1 introduction
3.2 Moving average filters
3.3 Primary FE models of simply supported beam
3.3.1 General definitions required in ABAQUS software
3.3.2 Defining damage at numerical model
3.4 Validation of moving average filter based damage detection method
3.4.1 Locating the damage
3.4.2 Predicting the baseline
3.4.3 Effect of velocity of moving load
3.4.4 Multiple damage scenarios
3.5 Why the MAF-based method is working?
3.6 Conclusions
4 Damage detection in simply supported steel beam under moving load: Experimental test
4.1 Introduction
4.2 Experimental model
4.3 Sensor assessment and signal correction methods
4.4 Results and discussion
4.5 Conclusions
5 Theory and methodology of RD technique based SHM
5.1 Introduction
5.2 Random Decrement techniques
5.3 Laboratory model of simply supported beam
5.4 Results and discussion
5.4.1 Primary data of simply supported beam
5.4.2 Normalizing the Arias intensity along the structure
5.4.3 Locating damage in simply supported beam
5.5 Conclusions
6 Damage detection in a tied-arch bridge under moving load: Experimental test
6.1 Introduction
6.2 Experimental model
6.3 Sensor assessment and signal correction methods
6.4 Results and discussion
6.4.1 Primary data of the tied-arch bridge
6.4.2 Normalizing the Arias intensity along the structure
6.4.3 Locating the connection loss in the cables at the tied-arch bridge
6.4.4 Detecting small damage ratios in laboratory models
6.5 Conclusions
7 Damage detection of the tied-arch bridge under seismic load (numerical analysis)
7.1 Introduction
7.2 Selecting the seismic events
7.3 Numerical simulation of the tied-arch bridge
7.3.1 Preliminary numerical model
7.3.2 Preliminary results of the tied-arch bridge under dead load
7.3.3 Applying the seismic load
7.4 Modal properties of tied-arch bridge using ARTeMIS
7.4.1 Preliminary results of dynamic seismic analysis
7.4.2 Determining the natural frequencies of the tied-arch bridge
7.5 Damage detection of the tied-arch bridge
7.5.1 Normalizing factor
7.5.2 Locating the damage under seismic load
7.6 Discussion
7.6.1 Effect of damage on the natural frequencies
7.6.2 Using band-pass filtering according to other natural frequencies
7.7 Conclusions
8 Conclusions and Outlook
8.1 Conclusions
8.2 Innovation points
8.3 Outlook
References
Appendix 1: MATLAB Codes for Random Decrement Technique
Appendix 2: Details of the experimental test procedure of the tied-arch bridge
Appendix 3: SeismoSignal Guidance with an example
Appendix 4: ARTeMIS Guidance with an example
作者简历及在学期间所取得的科研成果
1. Resume of the author
2. The Research Results and Published Papers
本文编号：3876721
【文章页数】：156 页
【学位级别】：博士
【文章目录】：
致谢
摘要
Abstract
1 Introduction
1.1 Background and motivation of research
1.2 Outline of research
2 Literature reviews
2.1 The concept of damage detection
2.2 Different techniques used in damage detection
2.2.1 Frequency based damage detection methods
2.2.2 Mode shapes based and mode shape curvatures based damage detection methods
2.2.3 Dynamic measured flexibility based damage detection method
2.2.4 Model updating based damage detection method
2.2.5 Signal processing based damage detection methods
2.3 Operational modal analysis (Output-only analysis)
2.4 Damage detection without using modal parameters
2.5 Signal correction
2.6 Conclusions
3 Theory and methodology of moving average filter based SHM
3.1 introduction
3.2 Moving average filters
3.3 Primary FE models of simply supported beam
3.3.1 General definitions required in ABAQUS software
3.3.2 Defining damage at numerical model
3.4 Validation of moving average filter based damage detection method
3.4.1 Locating the damage
3.4.2 Predicting the baseline
3.4.3 Effect of velocity of moving load
3.4.4 Multiple damage scenarios
3.5 Why the MAF-based method is working?
3.6 Conclusions
4 Damage detection in simply supported steel beam under moving load: Experimental test
4.1 Introduction
4.2 Experimental model
4.3 Sensor assessment and signal correction methods
4.4 Results and discussion
4.5 Conclusions
5 Theory and methodology of RD technique based SHM
5.1 Introduction
5.2 Random Decrement techniques
5.3 Laboratory model of simply supported beam
5.4 Results and discussion
5.4.1 Primary data of simply supported beam
5.4.2 Normalizing the Arias intensity along the structure
5.4.3 Locating damage in simply supported beam
5.5 Conclusions
6 Damage detection in a tied-arch bridge under moving load: Experimental test
6.1 Introduction
6.2 Experimental model
6.3 Sensor assessment and signal correction methods
6.4 Results and discussion
6.4.1 Primary data of the tied-arch bridge
6.4.2 Normalizing the Arias intensity along the structure
6.4.3 Locating the connection loss in the cables at the tied-arch bridge
6.4.4 Detecting small damage ratios in laboratory models
6.5 Conclusions
7 Damage detection of the tied-arch bridge under seismic load (numerical analysis)
7.1 Introduction
7.2 Selecting the seismic events
7.3 Numerical simulation of the tied-arch bridge
7.3.1 Preliminary numerical model
7.3.2 Preliminary results of the tied-arch bridge under dead load
7.3.3 Applying the seismic load
7.4 Modal properties of tied-arch bridge using ARTeMIS
7.4.1 Preliminary results of dynamic seismic analysis
7.4.2 Determining the natural frequencies of the tied-arch bridge
7.5 Damage detection of the tied-arch bridge
7.5.1 Normalizing factor
7.5.2 Locating the damage under seismic load
7.6 Discussion
7.6.1 Effect of damage on the natural frequencies
7.6.2 Using band-pass filtering according to other natural frequencies
7.7 Conclusions
8 Conclusions and Outlook
8.1 Conclusions
8.2 Innovation points
8.3 Outlook
References
Appendix 1: MATLAB Codes for Random Decrement Technique
Appendix 2: Details of the experimental test procedure of the tied-arch bridge
Appendix 3: SeismoSignal Guidance with an example
Appendix 4: ARTeMIS Guidance with an example
作者简历及在学期间所取得的科研成果
1. Resume of the author
2. The Research Results and Published Papers
本文编号：3876721
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