Weighing Trucks In Motion Using Instrumented Highway Bridges
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Weighing Trucks In Motion Using Instrumented Highway Bridges
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Author : Fred Moses
language : en
Publisher:
Release Date : 1980
Weighing Trucks In Motion Using Instrumented Highway Bridges written by Fred Moses and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Bridges categories.
Weighing Trucks In Motion Using Instrumented Highway Bridges
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Author : Fred Moses
language : en
Publisher:
Release Date : 1981
Weighing Trucks In Motion Using Instrumented Highway Bridges written by Fred Moses and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with Bridges categories.
Weighing Trucks In Motion Using Instrumental Highway Bridges
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Author : Fred Moses
language : en
Publisher:
Release Date : 1981
Weighing Trucks In Motion Using Instrumental Highway Bridges written by Fred Moses and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with Bridges categories.
Instrumentation For Weighing Trucks In Motion For Highway Bridge Loads
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Author : Fred Moses
language : en
Publisher:
Release Date : 1983
Instrumentation For Weighing Trucks In Motion For Highway Bridge Loads written by Fred Moses and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with Bridges categories.
Weigh In Motion Instrumentation
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Author : Fred Moses
language : en
Publisher:
Release Date : 1978
Weigh In Motion Instrumentation written by Fred Moses and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with Bridges categories.
Bridge Weigh In Motion Challenges And Opportunities
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Author : Xiangang Lai
language : en
Publisher:
Release Date : 2021
Bridge Weigh In Motion Challenges And Opportunities written by Xiangang Lai and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with Bridges categories.
Traffic loads on the highway bridges have been increasing in the past years. Actual truck axle configurations and weights may deviate significantly from standard legal design trucks depending on States, freight corridors, and seasons. Changes in legal truckloads are often made by state legislatures based on the pressure by the trucking industry. It is important to understand how trucks impact bridges and whether they cause deterioration and degradation so that policy decisions on legal truckloads can be based on scientific facts. The information of the actual passing vehicles that would be required to address such concerns includes actual truck axle loads and configurations, speeds, and dynamic effects. The critical questions are: How can we measure truck axle configurations and weights over the long term? How can we identify and measure the corresponding critical bridge responses over the long term, and how can we relate these to changes in the bridge life cycle? Finding objective answers to these questions requires complex research. This study is a first step through exploring bridge weigh-in-motion (B-WIM) algorithms, which help to capture the truck’s information for instrumented bridges in operations. Several B-WIM algorithms were inspected first and classified based on their assumptions in incorporating dynamic bridge vehicle interaction. For instance, B-WIM algorithms can be classified as static and dynamic. For the static case, the dynamic effect caused by the interaction between vehicle and bridge is mostly ignored, which results in significant inaccuracies when the dynamic component of the coupled systems is not insignificant or challenging to filter out. Therefore, this study mainly focuses on dynamic algorithms. Various dynamic algorithms, such as dynamic programming and augmented Kalman filters (AKF), have been investigated for their challenges and opportunities they offer into B-WIM applications. Various techniques were employed to address the potential deficiency of dynamic algorithms. These techniques include modal superposition technique to deal with complex structures, mode truncation, singular value decomposition to mitigate the singularity of the formulation matrices, and dummy measurements to improve the identification process's observability. The influence of different parameters on the performance of AKF based B-WIM algorithms were investigated via a parametric study of a simply supported beam subject to moving forces. The results show that those parameter has been carefully chosen for the success of the force prediction. A B-WIM framework was developed. The framework is composed of all the components required to estimate the vehicular weights all the way up from conceptualizations. Critical ones include structural identification to prepare the digital twin, eigenvalue reduction to reduce the dimension of the problem, the numerically verified AKF algorithm, and a parameter tuning method based on optimization technique. A scale model inspired by a typical highway bridge span was designed and constructed in the laboratory following the Similitude Theory. It aims to demonstrate the capability of the proposed B-WIM framework. Multiple tests with different vehicular speeds, weights, and moving paths were conducted and analyzed. Complete force-time histories were predicted and discussed. For B-WIM, the vehicular weights were calculated by averaging the force-time history segment where the vehicle was entirely on the bridge, and results show good agreement between the predicted forces and the static weights.
Loading Spectrum Experienced By Bridge Structures In The United States
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Author :
language : en
Publisher:
Release Date : 1985
Loading Spectrum Experienced By Bridge Structures In The United States written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Bridges categories.
More than 27,000 trucks were weighed in seven states using a Bridge Weigh-in-Motion system. The system used instrumented highway bridge girders to act as equivalent static scales to obtain truck gross and axle weights, dimensions and speed. Improvements were made in the system software and hardware such that weighing can now be performed automatically with no traffic observer necessary. The weighing operation is undetectable by truck drivers hence the results are not biased due to heavy trucks avoiding the scale. Night weighing has been performed with no danger to crew personnel or highway traffic.
Advances In Weigh In Motion Using Pattern Recognition And Prediction Of Fatigue Life Of Highway Bridges
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Author : Nicolas Gagarine
language : en
Publisher:
Release Date : 1992
Advances In Weigh In Motion Using Pattern Recognition And Prediction Of Fatigue Life Of Highway Bridges written by Nicolas Gagarine and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Girders categories.
The two main objectives of the present study were to: (1) demonstrate the advantages of using the Weigh-in-Motion and Response (WIM+R) system to evaluate the fatigue life of existing bridges and (2) introduce pattern recognition methods in the analysis of WIM+R data. Four steel girder bridges were instrumented to obtain strain data at fatigue critical details, and at sections of maximum strain to compute the gross vehicle weight (GVW) of each truck. Two were simple spans, and two continuous spans. A comparative study of three of the four alternatives suggested by AASHTO showed that the fatigue life computed with direct measurements of the stress ranges were greater than those computed with the simplified approaches. The effect of secondary cycles was negligible for the four bridges. The damage equivalent secondary cycle factor for fatigue was defined. The applicability of three pattern recognition methods for WIM+R was investigated. The dynamic time warping, hidden Markov model, and feed forward neural network methods can classify trucks with the measured strain patterns alone.
Weigh In Motion Road Vehicles
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Author : Bernard Jacob
language : en
Publisher: Kogan Page Limited
Release Date : 1999
Weigh In Motion Road Vehicles written by Bernard Jacob and has been published by Kogan Page Limited this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Technology & Engineering categories.
The project WAVE, a transport research and development project in the 4th Framework Programme of the European Commission, on weighing in motion of road vehicles, is being wound down after two and a half years of steady work. Thanks to fruitful co-operation among the partners, and the complementary contributions of the various participating organisations, significant scientific and technical progress has been made and very many results established. New theories, models, algorithms, and procedures have been generated, prototypes built, and field tests performed. New prospects have been opened up in weighing by multiple sensors and by instrumented bridges; an innovative technology bas been developed using optical fibres and optronics, and there have been significant advances in the calibration of the systems and in the quality and management of weigh-in-motion data. Experiments on road fitted with sensors and on instrumented bridges have yielded precious qualitative information on the durability, performance, and precision of many types of weigh-in-motion systems and precision of many types of weigh-in-motion systems, especially in cold climates. The first part of this volume of proceedings (sessions 1 to 4) presents the advances and fallout of the project, with special emphasis on users' expectations, and the second part (sessions 5 to 8) gives the scientific and technical results in more detail.
Highway Vehicle Bridge Coupled Vibrations Numerical Simulations And Applications
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Author : Steve C S Cai
language : en
Publisher: World Scientific
Release Date : 2020-09-23
Highway Vehicle Bridge Coupled Vibrations Numerical Simulations And Applications written by Steve C S Cai and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-09-23 with Technology & Engineering categories.
Vehicle-bridge interaction happens all the time on roadway bridges and this interaction performance carries much useful information. On one hand, while vehicles are traditionally viewed as loads for bridges, they can also be deemed as sensors for bridges' structural response. On the other hand, while bridges are traditionally viewed as carriers for vehicle weight, they can also be deemed as scales that can weigh the vehicle loads. Based on these observations, a broad area of studies based on the vehicle-bridge interaction have been conducted in the authors' research group. Understanding the vehicle and bridge interaction can help develop strategies for bridge condition assessment, bridge design, and bridge maintenance, as well as develop insight for new research needs.This book documents fundamental knowledge, new developments, and state-of-the-art applications related to vehicle-bridge interactions. It thus provides useful information for graduate students and researchers and therefore straddles the gap between theoretical research and practical applications.