Download or read book Preliminary Results on the Monitoring of an In Service Bridge Using a 32 Channel Fiber Bragg Grating Sensor System written by and published by . This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes the preliminary results of the performance of a 32-channel fiber Bragg grating (FBG) system used to monitor the dynamic response of an in-service interstate bridge (North-bound span, 1-10 at University Blvd., Las Cruces, New Mexico). Fiber Bragg grating sensors were attached on four different support girders in groups of three at various locations along the span of the bridge. Using an interrogation approach based on the scanning Fabry-Perot system, the sensors were monitored for various vehicle loading conditions. They dynamic response of the bridge to a typical traffic load event as detected by a group of three sensors on a particular girder is illustrated in some detail by describing the data both in time and frequency domains. This is followed by a description of the response of all 32 sensors on the bridge to two traffic loading events. The field test results indicate that the natural resonant frequencies of the first two longitudinal modes of the bridge are 2.5 Hz and 3.8 Hz, respectively. The preliminary results reported here clearly demonstrate that an optical FBG sensor system is ideally suited for monitoring weigh-in-motion traffic events as well as for providing the dynamic properties of bridge structures.

Download or read book Structural Monitoring with Fiber Optic Technology written by Raymond M. Measures and published by Elsevier. This book was released on 2001-04-10 with total page 736 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the first to address the field of structurally integrated fiber optic sensors. Fiber optic sensors embedded within materials and systems are able to measure a variety of parameters (i.e. temperature, vibration, deformation, strain, etc.) that allows for real time non-destructive evaluation. Examples include the following: monitoring structural fatigue in aging aircraft or loads in bridge structures. In more advanced applications, fiber optic sensors control actuators that allow materials to adapt to their environment. This gives rise to the names, "smart," "intelligent," and/or "adaptive" materials or structures.Structural Monitoring with Fiber Optic Technology is the firs single author book on the new field of fiber optic structural sensing. As such it provides: coverage of the fundamentals of the technology, a coherent and systematic discussion on the most important aspects of the subject, a broad view of the subject, while retaining a degree of focus on those advances most significant in terms of their future potential, particularly in regard to broad implementation of the technology. The book provides an introduction to the relevant value to structural monitoring. It also highlights the advantages of fiber optic based sensors over conventional electrical measurement technology.The book richly illustrates the subject matter with 615 figures and provides many examples of fiber optic structural sensing, including a detailed overview of a number of major field site applications. Most of these large scale applications are drawn from the civil engineering community as they have been the first to strongly embrace fiber optic structural monitoring. This is especially true for bridges, where innovative new designs and the use of fiber reinforced polymer composite materials to replace steel represents a major advance that is expected to revolutionize the construction industry. Examples include new bridges, which are serving as testbeds for these new materials and are instrumented with arrays of fiber optic structural sensors. In one case, this state-of-the-art monitoring system permits engineers at a distant site to track the response of the bridge to traffic loads and keep an eye on the long term performance of the new materials. Fiber optic structural sensing technology is equally applicable to other industrial sectors, such as the aerospace and marine industries. Indeed, several examples of ships being instrumented with arrays of fiber optic sensors are also included. * The author directed one of the leading laboratories in the development of this technology and its application to civil engineering* Provides a strong, concise foundation in the basics of the technology* Includes many examples of the application of the technology, including many major field site case studies* Richly illustrated with 615 figures, many redrawn to make them easier to understand; also includes over 600 references* Written in a style designed to help the reader unfamiliar with fiber optic technology appreciate what can be accomplished with this new form of structural monitoring

Download or read book Structural Health Monitoring of Civil Infrastructure Systems written by Vistasp M. Karbhari and published by Elsevier. This book was released on 2009-08-25 with total page 553 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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

Download or read book Monitoring and Safety Evaluation of Existing Concrete Structures written by fib Fédération internationale du béton and published by fib Fédération internationale du béton. This book was released on 2003 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: The condition assessment of aged structures is becoming a more and more important issue for civil infrastructure management systems. The continued use of existing systems is, due to environmental, economical and socio-political assets, of great significance and is growing larger every year. Thus the extent of necessary repair of damaged reinforced concrete structures is of major concern in most countries today. Monitoring techniques may have a decisive input to limit expenditures for maintenance and repair of existing structures. Modern test and measurement methods as well as computational mechanics open the door for a wide variety of monitoring applications. The need for quantitative and qualitative knowledge has led to the development and improvement of surveillance techniques, which have already found successful application in other disciplines such as medicine, physics and chemistry. The design of experimental test and measurement systems is inherently an interdisciplinary activity. The specification of the instrumentation to measure the structural response will involve the skills of civil, electrical and computer engineers. The main aim of fib Commission 5, Structural servicer life aspects, is to provide a rational procedure to obtain an optimal technical-economic performance of concrete structures in service and to ensure a feedback of experience gained to design, execution, maintenance and rehabilitation. Against this background fib Task Group 5.1 Monitoring and Safety Evaluation of Existing Concrete Structures had been established to evaluate the existing practice worldwide. The objective of this state-of-art report is to summarize the most important inspection and measuring methods, to describe the working process and to evaluate the applicability to structural monitoring. Particular emphasis is placed upon non-destructive systems, lifetime monitoring, data evaluation and safety aspects.

Download or read book OFS2000 Conference proceedings written by and published by . This book was released on 2000 with total page 984 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Rehabilitating and Repairing the Buildings and Bridges of the Americas written by Daniel A. Wendichansky and published by . This book was released on 2002 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: This collection contains 17 papers presented at a workshop, Rehabilitating and Repairing the Buildings and Bridges of the Americas: Hemispheric Workshop on Future Directions, held in Mayaguez, Puerto Rico, April 23-24, 2001.

Download or read book Monitoring of an Interstate 25 High Performance Concrete Bridge with an Embedded Optical Fiber Sensor System written by Rola Labban Idriss and published by . This book was released on 2009 with total page 223 pages. Available in PDF, EPUB and Kindle. Book excerpt: The I-25/Dona Ana Interchange in Las Cruces NM is a simple span, high performance concrete (HPC)prestressed girder bridge. The girders are six prestressed, BT-63 HPC girders with a span length of 112.5 ft (34.2 m). The bridge was monitored from fabrication through service with an embedded optical fiber sensor system. Thirty two Fiber Bragg Grating (FBG) optical fiber deformation sensors were installed in the beams during fabrication. The strands were 6/10 inch ( 1.5 cm ) low relaxation strands and the concrete had a design compressive strength of 8 ksi (55.2 MPa) at release and 9.5 ksi (66.5 MPa) at 28 days. The bridge was monitored for two years, from transfer of the prestressing force through service. Several topics that are studied in this project: prestress losses, camber, shear and moment girder distribution factors, impact factor, insitu material properties and serviceability under traffic loads. The results from sensor measurements were compared to the values predicted by the AASTHO codes and other design codes or empirical equations, to check the accuracy of these codes when applied to HPC girder bridges.

Download or read book Strain Monitoring During Construction of a Steel Box Girder Bridge with Arrays of FIber Bragg Grating Sensors written by Sandeep Vohra and published by . This book was released on 1999 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: Field performance of arrays of wavelength division multiplexed (WDM) fiber Bragg grating strain sensors is presented. Data from two field tests, carried out in February 1998 and October 1998 on an in-construction box-girder bridge, are presented and compared to data obtained from arrays of conventional sensors, where possible. The results in this report represent one of the first extensive tests of WDM Bragg grating sensor arrays on real world infrastructure. The results show that most of the well known advantages of fiber optic sensors, for example smaller array size, electromagnetic immunity, versatile data sets, easy installation, built-in telemetry and high sensitivity can be realized in real world environments.

Download or read book IEICE Transactions on Electronics written by and published by . This book was released on 2000 with total page 1174 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Strain Transfer Behavior of Notch Embedded Fiber Bragg Gratings written by Daniel Thomas Maurais and published by . This book was released on 2012 with total page 85 pages. Available in PDF, EPUB and Kindle. Book excerpt: The vehicle loads seen on Wyoming roadways are continuously increasing due to the demanding transportation needs of Wyoming's expanding energy industry. The resulting overload conditions experienced by Wyoming's aging bridges have called for the implementation of a structural health monitoring (SHM) system. A SHM system utilizing fiber optic strain sensors called Fiber Bragg Gratings (FBGs) have proven in recent years to be an innovative and effective solution for monitoring bridge conditions. Such a system will allow WYDOT engineers to monitor the damages and fatigue effects of overloaded Wyoming bridges over years of service. This research examined a new method of attaching FBG strain sensors to concrete structural members via adhesive embedment in concrete notches. The proposed method is ideal because it provides ample fiber protection from weathering and vandalism. Additionally, the FBG becomes a rooted component of the structure that is unlikely to detach or be scraped off throughout years of service. Both a finite element analysis (FEA) and an experimental investigation were conducted to analyze the effectiveness and feasibility of the proposed concrete strain monitoring method. The strain loss over the adhesive layer between the concrete and the FBG sensor was the primary variable of interest in the study. The strain loss directly affects the accuracy of the sensors in measuring the strain of the concrete. Several attachment configurations with different parameters were tested. The results of this study support the conclusion that there are certain notch embedment configurations that will provide accurate strain measurement of a concrete structural member. It was found that the FEA predicts slightly higher strain transfer than what occurs in real conditions. A feasible procedure for implementing the proposed sensing method in field conditions was developed during the experimental tests.

Download or read book Real size Structural Health Monitoring of a Pre stressed Concrete Bridge Based on Long gauge Fiber Bragg Grating Sensors written by Felipe Isamu H. Sakiyama and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Real size Structural Health Monitoring of a Pre stressed Concrete Bridge Based on Long gauge Fiber Bragg Grating Sensors written by Felipe Isamu H. Sakiyama and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book High Pressure Sensing and Dynamics Using High Speed Fiber Bragg Grating Interrogation Systems written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Fiber Bragg gratings (FBGs) are developing into useful sensing tools for measuring high pressure dynamics in extreme environments under shock loading conditions. Approaches using traditional diode array coupled FBG interrogation systems are often limited to readout speeds in the sub-MHz range. For shock wave physics, required detection speeds approaching 100 MHz are desired. We explore the use of two types of FBG sensing systems that are aimed at applying this technology as embedded high pressure probes for transient shock events. Both approaches measure time resolved spectral shifts in the return light from short (few mm long) uniform FBGs at 1550 nm. In the first approach, we use a fiber coupled spectrometer to demultiplex spectral channels into an array (up to 12) of single element InGaAs photoreceivers. By monitoring the detectors during a shock impact event with high speed recording, we are able to track the pressure induced spectral shifting in FBG down to a time resolution of 20 ns. In the second approach, developed at the Special Technologies Lab, a coherent mode-locked fiber laser is used to illuminate the FBG sensor. After the sensor, wavelength-to-time mapping is accomplished with a chromatic dispersive element, and entire spectra are sampled using a single detector at the modelocked laser repetition rate of 50 MHz. By sampling with a 12 GHz InGaAs detector, direct wavelength mapping in time is recorded, and the pressure induced FBG spectral shift is sampled at 50 MHz. Here, the sensing systems are used to monitor the spectral shifts of FBGs that are immersed into liquid water and shock compressed using explosives. In this configuration, the gratings survive to pressures approaching 50 kbar. We describe both approaches and present the measured spectral shifts from the shock experiments.

Download or read book Use of Fiber Bragg Grating FBG Sensors for Performing Automated Bridge Pier Structural Damage Detection and Scour Monitoring written by Athanasios Papanicolaou and published by . This book was released on 2012 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bridge Monitoring written by Campbell R Middleton and published by ICE Publishing. This book was released on 2016-08-22 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bridge Monitoring provides practical guidance on the monitoring of bridges, with a particular focus on the use of sensor technologies and bridge monitoring systems. As vital infrastructure assets, it is important that bridges are monitored effectively to ensure that they continue to be safe, operational and appropriately maintained.

Download or read book Development of a Fiber Optic Based Load Testing System for Highway Bridges written by Michael A. Jung and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The present state of American infrastructure demands new solutions to prolong the life of civil structures and quantify the performance of aging structures that have suffered varying degrees of degradation. This is especially true of bridges, which are routinely subjected to environmental events and are depended upon to reliably and safely move huge quantities of goods and people. A structural health monitoring system can supplement traditional bridge inspection methods to aid in detecting deterioration in structures and to perform load rating tests to determine more accurate structural capacities than those predicted by analytical methods alone. With better information about bridge performance and condition, bridge management officials can better allocate resources for maintaining highway networks. This thesis develops techniques for implementing a structural health monitoring system based on fiber Bragg grating strain sensors that may be used to perform diagnostic load rating tests after further development. This thesis discusses sensor placement, installation, protection methods, and analysis techniques. To develop the methods discussed, a scale model bridge was constructed in the laboratory consisting of a pre-stressed concrete beam and a steel beam. Thus, it was possible to develop methods for sensing behavior in concrete and steel elements. The techniques for system design, sensor installation, and analysis developed in this thesis provide a preliminary groundwork for the future development of a structural health monitoring system that can be used to evaluate the capacity of bridges. These techniques will be refined, further developed, and field-tested in the next phases of this project. Additional parameters that were not studied in the laboratory are discussed and will also be studied in the next phases of research.

Download or read book Static and Dynamic Testing of Bridges and Highways Using Long Gage Fiber Bragg Grating Based Strain Sensors written by and published by . This book was released on 2000 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fiber optic Bragg gratings packaged in long gage configurations are being used to measure static and dynamic strain in structures and structural models to monitor structural health and predict damage incurred from a seismic event. These long gage sensors are being used to experimentally verify analytical models of post-earthquake evaluation based on system identification analysis. This fiber optic deformation measurement system could play a significant role in monitoring/recording with a higher level of completeness the actual seismic response of structures and in non-destructive seismic damage assessment techniques based on dynamic signature analysis. This new sensor technology will enable field measurements of the response of real structures to real earthquakes with the same or higher level of detail/resolution as currently in structural testing under controlled laboratory conditions.