Dynamics of Civil Structures, Volume 2: Proceedings of the 39th IMAC, A Conference and Exposition on Structural Dynamics 2021 (Conference Proceedings of the Society for Experimental Mechanics Series)

Dynamics of Civil Structures, Volume 2: Proceedings of the 39th IMAC, A Conference and Exposition on Structural Dynamics , 2021, the second volume of nine from the Conference brings together contributions to this important area of research and engineering. The collection presents early findings and case studies on fundamental and applied aspects of the Dynamics of Civil Structures, including papers on: Structural Vibration Humans & Structures Innovative Measurement for Structural Applications Smart Structures and Automation Modal Identification of Structural Systems Bridges and Novel Vibration Analysis Sensors and Control Preface Contents Particle Filters and Auto-Encoders Combination for Damage Diagnosis on Hysteretic Non-Linear Structures Subject to Changing Environmental Conditions 1 Introduction 2 Methodology 2.1 State-Space Model, Particle Filter an Auto-Encoders 2.2 Definition of the Diagnostic Indicators 3 Case Study 4 Conclusions References A New Benchmark Problem for Structural Damage Detection: Bolt Loosening Tests on a Large-Scale Laboratory Structure 1 Introduction 2 The Benchmark Website 3 Benchmark Dataset Description 4 Conclusions References Implementation of an Organic Database Structure for Population-Based Structural Health Monitoring 1 Introduction 2 PBSHM Schema Requirements 3 Database 3.1 RDBMS 3.2 NoSQL 3.3 Database Choice 4 The PBSHM Schema 4.1 Organic Design 4.2 Time First Approach 4.3 Implementation 4.3.1 Structure 4.3.2 Channel 4.3.3 Value 4.3.4 Installation 4.3.5 Indexes 4.3.6 Querying 4.3.7 Download 4.4 Data Import 5 Conclusion Appendix 1: Non-organic Basic Schema Appendix 2: Organic Basic Schema Appendix 3: Accepted Channel Objects Within the v1.0 Schema Appendix 4: PBSHM Schema Installation Appendix 5: Single vs Multiple File Channel Data Appendix 6: PBSHM Database Querying References Estimation of Blade Forces in Wind Turbines Using Strain Measurements Collected on Blades 1 Introduction 2 Methodology 3 Results 4 Conclusions References On Health-State Transition Models for Risk-Based Structural Health Monitoring 1 Introduction 2 Probabilistic Risk-Based SHM 2.1 Probabilistic Graphical Models 2.2 Decision Framework 3 Developing Transition Models for Risk-Based SHM 3.1 Operational Evaluation 3.2 Handling Uncertainty 3.3 Generating Transition Models 4 Case Study: Four-Bay Truss 4.1 Operational Conditions 4.2 Failure Criteria 4.3 Transition Modelling 5 Discussion 5.1 Importance of Transition Models 5.2 Challenges 6 Summary References Cointegration for Structural Damage Detection Under Environmental Variabilities: An Experimental Study 1 Introduction 2 Methodology 2.1 Mahalanobis Distance-Based Outlier Analysis of Response Covariances 2.2 Cointegration-Based Scheme 3 Laboratory Experiment 3.1 Experimental Setup 3.2 Data Acquisition and Feature Extraction 4 Results 5 Conclusion References Footbridge Vibrations and Modelling of Pedestrian Loads Nomenclature 1 Introduction 2 Modelling of Walking Loads 3 Studies of This Paper 3.1 Impact of Decisions Related to Modelling the Load Amplification Factor 3.2 Impact of Decisions Related to Modelling the Step Frequency 4 Conclusion and Discussion References Multi-LSTM-Based Framework for Ambient Intelligence 1 Introduction 2 Related Work 3 Background 4 Overview of the Proposed Approach 5 Experimental Setup and Data Preparation 6 Proposed Network Architecture and Training 7 Discussion of Results 8 Conclusions and Future Work References Operational Modal Analysis and Finite Element Model Updating of a 53-Story Building 1 Introduction 2 Operational Modal Analysis 3 Finite Element Model Updating 4 Conclusions References An Overview of Deep Learning Methods Used in Vibration-Based Damage Detection in Civil Engineering 1 Introduction 2 Use of UPNs in Damage Detection of Civil Infrastructure 3 Use of CNNs in Damage Detection of Civil Infrastructure 3.1 2D CNNs 3.2 1D CNNs 4 Conclusions and Recommendations for Future Work References Transfer Learning from Audio Domains a Valuable Tool for Structural Health Monitoring 1 Introduction 2 Data 3 Analysis 4 Results 5 Conclusion References Experimental Evaluation of Drive-by Health Monitoring on a Short-Span Bridge Using OMA Techniques 1 Introduction 2 OMA Literature Review 2.1 Frequency Domain OMA Techniques 2.2 OMA in DBHM 3 Bridge and Vehicle Systems 3.1 Description 3.2 Instrumentation 4 Testing Strategy 5 Methodologies 5.1 Peak Picking 5.2 Frequency Domain Decomposition 6 Uncoupled System Identification 6.1 Preprocessing 6.2 Bridge Uncoupled OMA Analysis 6.3 RAM Truck Uncoupled OMA Analysis 6.4 Summary of Uncoupled OMA System Identification 7 Coupled Vehicle-Bridge System Identification 7.1 Preprocessing 7.2 Bridge Coupled OMA Analysis 7.3 RAM Truck Coupled OMA Analysis 7.4 Summary of Coupled OMA System Identification 8 Conclusion References Investigation of Low-Cost Accelerometer Performance for Vibration Analysis of Bridges 1 Introduction and Scope 2 Low-Cost MEMS and Instrument-Grade Accelerometers 3 Cantilever Beam Evaluation 3.1 Test Setup 3.2 Data Analysis and Results 3.3 Discussion 4 Highway Bridge Evaluation 5 Conclusions References Real-Time Human Cognition of Nearby Vibrations Using Augmented Reality 1 Introduction 2 Background 3 Test Results and Analyses 4 Conclusions References Understanding Errors from Multi-Input-Multi-Output (MIMO) Testing of a Cantilever Beam 1 Introduction 2 MISO Test Setup with Small Variation in Actuator Location 3 Test Results and Analyses 4 Conclusions References Load-Displacement Behavior Clustering of RC Shear Walls Using Functional Data Analysis 1 Introduction 1.1 Functional Data Analysis 1.2 Functional Principal Component Analysis 1.3 Application of FDA in Structural Health Monitoring and Non-destructive Evaluation 2 Analysis 2.1 Analysis Results 3 Conclusion References