Download or read book Next Generation Bridge Weigh in motion System Using Optical Sensors written by Myra Lydon and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Next generation Wireless Bridge Weigh in motion WIM System Integrated with Nondestructive Evaluation NDE Capability for Transportation Infrastructure Safety written by Yang Wang (Writer on structural engineering) and published by . This book was released on 2014 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Next generation Wireless Bridge Weigh in motion WIM System Integrated with Nondestructive Evaluation NDE Capability for Transportation Infrastructure Safety written by Yang Wang (Writer on structural engineering) and published by . This book was released on 2014 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Simulation of Bridge Weigh in Motion System Integrated with Bridge Safety written by Zhisong Zhao and published by . This book was released on 2012 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bridge weigh-in-motion system (B-WIM) testing is a popular technology in bridge applications. The B-WIM system can track extensive information about loading conditions to which bridges are subjected, and engineers can evaluate the responses of bridges and assess their performance relative to the safety index and serviceability. FAD (Free-of-Axle-Detector) or NOR (Nothing-On-Road) B-WIM system works well, but only if the system detects axle locations. In the USA, there are challenges for some beam-and-slab bridges. In the first manuscript, we describe a study with alternative strategies for sensor types and sensor installation locations for beam-and-slab bridges. The sensor layouts are identified and two new sensors are investigated. Most of the commercially available B-WIM systems are based on an algorithm developed by Moses (1979). The performance of this method is acceptable for estimating gross vehicle weight (GVW), but it can be unsatisfactory for estimating single axle loads. In order to improve the accuracy to an acceptable level, two algorithms are proposed. The second and third manuscripts present the measurement of axle weights and GVWs of moving heavy vehicles based on these algorithms. As determined in a case study of a bridge on US-78, both algorithms significantly improved the accuracy of measurements of axle weights in comparison with the commercial B-WIM system. Existing bridges may be functionally obsolete or have deficient structures based on older design codes or features. These bridges are not unsafe for normal vehicle traffic, but they can be vulnerable to specific traffic conditions. We propose, in manuscript 4, use of a simulation model based on B-WIM experimental data derived during extreme events. The results provide an improved understanding of the possible deficiencies of this bridge, and an appropriate retrofit is suggested. Finally, the dynamic amplification factor (DAF) is a significant parameter for design new of bridges and for evaluation of existing bridges. AASHTO guidelines provided very conservative values. So, improved methods for determination of DAF values need to be developed to evaluate the safety of existing bridges. This manuscript presents a simulation method to evaluate the DAF of existing bridges by use of the B-WIM data. The accurate results are obtained based on site-specific data.

Download or read book Development of a Bridge Weigh in Motion System written by Arturo Gonzalez and published by LAP Lambert Academic Publishing. This book was released on 2010-05 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: Weigh-in-Motion (WIM) data can be used to predict future traffic volumes and weights for the planning of new infrastructure, the management of maintenance activities, the identification/reduction of overloading problems and the evaluation of the performance of pavements and bridges. Most WIM systems are based on sensors placed in or on the pavement that measure the wheel force applied over them during a very short time. The value of this force varies as a result of road roughness and vehicle dynamics leading to limited accuracy for estimating static weights. Additionally, these systems experience durability problems due to traffic and environmental conditions. An alternative approach to WIM that addresses these limitations is the use of an instrumented bridge to weigh vehicles (B-WIM). This approach is the subject of research in this book. Inaccuracies derived from discrepancies between theoretical B-WIM algorithms and bridge measurements are investigated both theoretically and experimentally. The text also describes the development of a B-WIM system in Ireland, including all aspects of installation, calibration, data collection and its processing into useful traffic information.

Download or read book Applications of Fiber Optic Sensors in Weigh in motion WIM Systems for Monitoring Truck Weights on Pavements and Structures written by Luz Elena Yañez Mimbela and published by . This book was released on 2003 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of the Bridge Weigh in motion System written by and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Testing of a Bridge Weigh in Motion Algorithm Utilising Multiple Longitudinal Sensor Locations written by Arturo González and published by . This book was released on 2012 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new bridge weigh-in-motion (WIM) algorithm is developed which makes use of strain sensors at multiple longitudinal locations of a bridge to calculate axle weights. The optimisation procedure at the core of the proposed algorithm seeks to minimise the difference between static theory and measurement, a procedure common in the majority of bridge WIM algorithms. In contrast to the single unique value calculated for each axle weight in common Bridge WIM algorithms, the new algorithm provides a time history for each axle based on a set of equations formulated for each sensor at each scan. Studying the determinant of this system of equations, those portions of the time history of calculated axle weights for which the equations are poorly conditioned are removed from the final reckoning of results. The accuracy of the algorithm is related to the ability to remove dynamics and the use of a precise influence line. These issues are addressed through the use of a robust moving average filter and a calibration procedure based on using trucks from ambient traffic. The influence of additional longitudinal sensor locations on the determinant of the system of equations is discussed. Sensitivity analyses are carried out to analyse the effect of a misread axle spacing or velocity on the predictions, and as a result, the algorithm reveals an ability to identify potentially erroneous predictions. The improvement in accuracy of the calculated axle weights with respect to common approaches is shown, first using numerical simulations based on a vehicle-bridge interaction finite-element model, and second using experimental data from a beam-and-slab bridge in Slovenia.

Download or read book Development of a Low cost Bridge Weigh in motion System written by Bridge Weighing Systems, Inc and published by . This book was released on 1991 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bridge Health Monitoring Using Acceleration based Bridge Weigh in motion and a Re deployable Sensor Strategy written by Muhammad Arslan Khan and published by . This book was released on 2020 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of the Bridge Weigh in motion System written by and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Feasibility of Optimized Bridge Weigh in Motion Using Multimetric Responses written by Wenbin Wu and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A High Speed Portable Multi function Optical Fiber Weigh in motion WIM Sensing System written by Hongtao Zhang and published by . This book was released on 2009 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bridge Weigh in motion Long term Traffic Monitoring in the State of Connecticut written by and published by . This book was released on 2015 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Experimental and Field Investigation of a Bridge weigh in motion BWIM System Improving the Accuracy of Bridge Inspection Evaluation and Fatigue Assessment written by Sofia Faraz and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bridges are vital component of a country's transportation system and its economy. However, large number of ageing bridges are either structurally or geometrically deficient in some way. In recent years, the remaining life of ageing bridges, were calculated by detailed evaluation and damage assessment using structural health monitoring (SHM) techniques integrating bridge-weigh-in-motion (BWIM) systems. The field study of an existing BWIM system in Winnipeg, Manitoba was conducted on the Prototype Bridge. This work was extended to analysis and comparison of the algorithms adopted on the Prototype Bridge which provided deep insight in identifying the sources of error in BWIM systems. It was followed by a study on fatigue assessment of steel girder bridges. This research contributes by incorporating field measurements from BWIM system on the Prototype Bridge to estimate fatigue loading and damage assessment. In analytical phase, a simply supported beam subjected to moving and pulsating load was investigated for signal simulation and filtering in MATLAB. This was done as an initial exercise to understand dynamic effects of the load and its relevance to bridge natural frequency. This work was presented in a conference proceeding, attached in appendix. The experimental part of this work aims to identify sources of error in BWIM systems with the aid of the Model Bridge and verify area method, tested on the Prototype Bridge. The method was further investigated on the Model Bridge to obtain 95% confidence interval over real bridge BWIM testing. Model bridge structure was fabricated using polycarbonate. The model was designed to have natural frequencies like the Prototype Bridge. It was instrumented at two different locations with piezoelectric sensors for estimating velocity, transverse position, and class of model truck. It was instrumented with electrical strain gauges at three transverse locations for estimating Gross Vehicle Weight (GVW) of model truck. Video camera was used for verifying velocity profile. Author endeavored to establish relevance of long-term monitoring data obtained from BWIM to bridge evaluation. In this work it was proposed that SHM will add another level of inspection to CHBDC clauses and will improve the estimation of load carrying capacities of existing bridges.

Download or read book Advancements in Novel Material RFID Based Crack Sensing and Bridge Weigh in Motion written by Benjamin Bruciati and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The current infrastructure in the United States is continually deteriorating. Smart structures in civil engineering are becoming increasingly popular due to the performance enhancing systems they contain. Many of these systems are related to sensing and monitoring the structure. Structural health monitoring (SHM) has state of the art technological advances in both these fields. This thesis contributes to the advancements in the SHM field, particularly crack detection and Bridge Weigh-In-Motion (BWIM). The crack detection research uses existing radio frequency identification (RFID) crack detection technology and applies it to a novel material, Ultra High-Performance Concrete (UHPC). This system uses backscatter power to detect environmental change has been experimentally assessed in the lab for crack detection with varying crack widths of UHPC. BWIM is the use of an in-service bridge and its responses to detect vehicle characteristics of that vehicle traveling over that bridge. For BWIM advancements, speed calculation of trucks traveling over bridges is a main factor in many BWIM methodology. This thesis presents two speed calculation methods using one or two sensors to use in the speed calculation portion of vehicle weight determination algorithm. With this new algorithm, bridge response, and truck weight data, the vehicles weights are determined, and their performance are evaluated with two standardized specifications. These additions to the SHM community both present low cost and non-intrusive methods that gain insight into these smart structures to better maintain the United States infrastructure network.

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.