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Author: You Lin Xu Publisher: CRC Press ISBN: 0415597935 Category : Technology & Engineering Languages : en Pages : 393
Book Description
Long span suspension bridges cost billions. In recent decades, structural health monitoring systems have been developed to measure the loading environment and responses of these bridges in order to assess serviceability and safety while tracking the symptoms of operational incidents and potential damage. This helps ensure the bridge functions properly during a long service life and guards against catastrophic failure under extreme events. Although these systems have achieved some success, this cutting-edge technology involves many complex topics that present challenges to students, researchers, and engineers alike. Systematically introducing the fundamentals and outlining the advanced technologies for achieving effective long-term monitoring, Structural Health Monitoring of Long-Span Suspension Bridges covers: The design of structural health monitoring systems Finite element modelling and system identification Highway loading monitoring and effects Railway loading monitoring and effects Temperature monitoring and thermal behaviour Wind monitoring and effects Seismic monitoring and effects SHMS-based rating method for long span bridge inspection and maintenance Structural damage detection and test-bed establishment These are applied in a rigorous case study, using more than ten years' worth of data, to the Tsing Ma suspension bridge in Hong Kong to examine their effectiveness in the operational performance of a real bridge. The Tsing Ma bridge is the world's longest suspension bridge to carry both a highway and railway, and is located in one of the world’s most active typhoon regions. Bridging the gap between theory and practice, this is an ideal reference book for students, researchers, and engineering practitioners.
Author: You Lin Xu Publisher: CRC Press ISBN: 0415597935 Category : Technology & Engineering Languages : en Pages : 393
Book Description
Long span suspension bridges cost billions. In recent decades, structural health monitoring systems have been developed to measure the loading environment and responses of these bridges in order to assess serviceability and safety while tracking the symptoms of operational incidents and potential damage. This helps ensure the bridge functions properly during a long service life and guards against catastrophic failure under extreme events. Although these systems have achieved some success, this cutting-edge technology involves many complex topics that present challenges to students, researchers, and engineers alike. Systematically introducing the fundamentals and outlining the advanced technologies for achieving effective long-term monitoring, Structural Health Monitoring of Long-Span Suspension Bridges covers: The design of structural health monitoring systems Finite element modelling and system identification Highway loading monitoring and effects Railway loading monitoring and effects Temperature monitoring and thermal behaviour Wind monitoring and effects Seismic monitoring and effects SHMS-based rating method for long span bridge inspection and maintenance Structural damage detection and test-bed establishment These are applied in a rigorous case study, using more than ten years' worth of data, to the Tsing Ma suspension bridge in Hong Kong to examine their effectiveness in the operational performance of a real bridge. The Tsing Ma bridge is the world's longest suspension bridge to carry both a highway and railway, and is located in one of the world’s most active typhoon regions. Bridging the gap between theory and practice, this is an ideal reference book for students, researchers, and engineering practitioners.
Author: Yang Deng Publisher: Springer ISBN: 9811333475 Category : Technology & Engineering Languages : en Pages : 243
Book Description
This book presents extensive information on structural health monitoring for suspension bridges. During the past two decades, there have been significant advances in the sensing technologies employed in long-span bridge health monitoring. However, interpretation of the massive monitoring data is still lagging behind. This book establishes a series of measurement interpretation frameworks that focus on bridge site environmental conditions, and global and local responses of suspension bridges. Using the proposed frameworks, it subsequently offers new insights into the structural behaviors of long-span suspension bridges. As a valuable resource for researchers, scientists and engineers in the field of bridge structural health monitoring, it provides essential information, methods, and practical algorithms that can facilitate in-service bridge performance assessments.
Author: You Lin Xu Publisher: CRC Press ISBN: 0203839668 Category : Technology & Engineering Languages : en Pages : 390
Book Description
Long span suspension bridges cost billions. In recent decades, structural health monitoring systems have been developed to measure the loading environment and responses of these bridges in order to assess serviceability and safety while tracking the symptoms of operational incidents and potential damage. This helps ensure the bridge functions prope
Author: Matthew Thomas Yarnold Publisher: ISBN: Category : Civil engineering Languages : en Pages : 856
Book Description
Temperature-based methods for the structural evaluation and monitoring of long-span bridges were investigated. The motivation for the work stemmed from the critical need for further assessment and preservation techniques for long-span bridges, which represent the most critical (and in many cases irreplaceable) nodes within the transportation network. Through this work, several methods were developed which utilize temperature as the forcing function to experimentally characterize the structure. This approach is novel and represents a potential improvement over current methods (e.g. ambient vibration monitoring) which do not allow the full transfer function of the bridge to be obtained. In particular, this research developed and investigated three temperature-based evaluation methods. The first, termed Temperature-Based Structural Identification (TBSI), follows from the traditional structural identification framework. This approach is used for direct correlation of the input (temperature) and output responses (strains and displacements) for finite element (FE) model calibration and parameter identification. The second method, termed Temperature-Based Structural Health Monitoring (TBSHM), utilizes a streamlined approach to continually track and identify variations in key temperature-based response patterns. An interpretation framework using changes in these patterns to guide proactive maintenance and preservation practices was also developed. The last method, termed Periodic Temperature-Based Assessment (PTBA), aims to directly (i.e. without the use of an FE model or baseline information) characterize the performance of key mechanisms of a bridge by measuring physically meaningful and easily interpreted response metrics. The research concluded temperature-based experimentation provides valuable insight into the performance of long-span bridges. TBSI exhibits accurate and reliable identification of FE model boundary and continuity conditions with clear advantages over ambient vibration model updating. The use of TBSHM has also indicated encouraging contributions to conventional SHM approaches. A distinct baseline was identified as the relationship between local strains, global displacements, and temperature variation which produces unique planes in 3D space. These 3D planes have greater sensitivity to parameter modification when compared to ambient vibration methods and show promise for identification of outliers. Additionally, quantitative performance measures were developed for PTBA of long-span bridges. This approach can improve current evaluate methods of movement mechanisms and assess long-term durability of a structure. Overall, TBSI, TBSHM, and PTBA have shown substantial benefits for advancing our understanding of constructed long-span bridge behavior.
Author: Navid Zolghadri Publisher: ISBN: Category : Languages : en Pages :
Book Description
Structural Health Monitoring (SHM) is a promising tool for condition assessment of bridge structures. SHM of bridges can be performed for different purposes in long or short-term. A few aspects of short- and long-term monitoring of highway bridges are addressed in this research. Without quantifying environmental effects, applying vibration-based damage detection techniques may result in false damage identification. As part of a long-term monitoring project, the effect of temperature on vibrational characteristics of two continuously monitored bridges are studied. Natural frequencies of the structures are identified from ambient vibration data using the Natural Excitation Technique (NExT) along with the Eigen System Realization (ERA) algorithm. Variability of identified natural frequencies is investigated based on statistical properties of identified frequencies. Different statistical models are tested and the most accurate model is selected to remove the effect of temperature from the identified frequencies. After removing temperature effects, different damage cases are simulated on calibrated finite-element models. Comparing the effect of simulated damages on natural frequencies showed what levels of damage could be detected with this method. Evaluating traffic loads can be helpful to different areas including bridge design and assessment, pavement design and maintenance, fatigue analysis, economic studies and enforcement of legal weight limits. In this study, feasibility of using a single-span bridge as a weigh-in-motion tool to quantify the gross vehicle weights (GVW) of trucks is studied. As part of a short-term monitoring project, this bridge was subjected to four sets of high speed, live-load tests. Measured strain data are used to implement bridge weigh-in-motion (B-WIM) algorithms and calculate the corresponding velocities and GVWs. A comparison is made between calculated and static weights, and furthermore, between supposed speeds and estimated speeds of the trucks. Vibration-based techniques that use finite-element (FE) model updating for SHM of bridges are common for infrastructure applications. This study presents the application of both static and dynamic-based FE model updating of a full scale bridge. Both dynamic and live-load testing were conducted on this bridge and vibration, strain, and deflections were measured at different locations. A FE model is calibrated using different error functions. This model could capture both global and local response of the structure and the performance of the updated model is validated with part of the collected measurements that were not included in the calibration process.
Author: Branko Glisic Publisher: John Wiley & Sons ISBN: 9780470517802 Category : Technology & Engineering Languages : en Pages : 276
Book Description
The use of fibre optic sensors in structural health monitoring has rapidly accelerated in recent years. By embedding fibre optic sensors in structures (e.g. buildings, bridges and pipelines) it is possible to obtain real time data on structural changes such as stress or strain. Engineers use monitoring data to detect deviations from a structure’s original design performance in order to optimise the operation, repair and maintenance of a structure over time. Fibre Optic Methods for Structural Health Monitoring is organised as a step-by-step guide to implementing a monitoring system and includes examples of common structures and their most-frequently monitored parameters. This book: presents a universal method for static structural health monitoring, using a technique with proven effectiveness in hundreds of applications worldwide; discusses a variety of different structures including buildings, bridges, dams, tunnels and pipelines; features case studies which describe common problems and offer solutions to those problems; provides advice on establishing mechanical parameters to monitor (including deformations, rotations and displacements) and on placing sensors to achieve monitoring objectives; identifies methods for interpreting data according to construction material and shows how to apply numerical concepts and formulae to data in order to inform decision making. Fibre Optic Methods for Structural Health Monitoring is an invaluable reference for practising engineers in the fields of civil, structural and geotechnical engineering. It will also be of interest to academics and undergraduate/graduate students studying civil and structural engineering.
Author: Helmut Wenzel Publisher: John Wiley & Sons ISBN: 0470740183 Category : Technology & Engineering Languages : en Pages : 652
Book Description
Health Monitoring of Bridges prepares the bridge engineering community for the exciting new technological developments happening in the industry, offering the benefit of much research carried out in the aerospace and other industrial sectors and discussing the latest methodologies available for the management of bridge stock. Health Monitoring of Bridges: Includes chapters on the hardware used in health monitoring, methodologies, applications of these methodologies (materials, methods, systems and functions), decision support systems, damage detection systems and the rating of bridges and methods of risk assessment. Covers both passive and active monitoring approaches. Offers directly applicable methods and as well as prolific examples, applications and references. Is authored by a world leader in the development of health monitoring systems. Includes free software that can be downloaded from http://www.samco.org/ and provides the raw data of benchmark projects and the key results achieved. This book provides a comprehensive guide to all aspects of the structural health monitoring of bridges for engineers involved in all stages from concept design to maintenance. It will also appeal to researchers and academics within the civil engineering and structural health monitoring communities.
Author: Vistasp M. Karbhari Publisher: Elsevier ISBN: 1845696824 Category : Technology & Engineering Languages : en Pages : 553
Book Description
Structural health monitoring is an extremely important methodology in evaluating the ‘health’ of a structure by assessing the level of deterioration and remaining service life of civil infrastructure systems. This book reviews key developments in research, technologies and applications in this area of civil engineering. It discusses ways of obtaining and analysing data, sensor technologies and methods of sensing changes in structural performance characteristics. It also discusses data transmission and the application of both individual technologies and entire systems to bridges and buildings. With its distinguished editors and international team of contributors, Structural health monitoring of civil infrastructure systems is a valuable reference for students in civil and structural engineering programs as well as those studying sensors, data analysis and transmission at universities. It will also be an important source for practicing civil engineers and designers, engineers and researchers developing sensors, network systems and methods of data transmission and analysis, policy makers, inspectors and those responsible for the safety and service life of civil infrastructure. Reviews key developments in research, technologies and applications Discusses systems used to obtain and analyse data and sensor technologies Assesses methods of sensing changes in structural performance
Author: You Lin Xu
Author: You Lin Xu
Author: Yang Deng
Author: Jinsuk Yim
Author: You Lin Xu
Author: Matthew Thomas Yarnold
Author: 
Author: Navid Zolghadri
Author: Branko Glisic
Author: Helmut Wenzel
Author: Vistasp M. Karbhari