The Accuracy Of Bridge Weigh In Motion Systems
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The Accuracy Of Bridge Weigh In Motion Systems
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Author : Anthony T. Dempsey
language : en
Publisher:
Release Date : 1997
The Accuracy Of Bridge Weigh In Motion Systems written by Anthony T. Dempsey and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with categories.
Simulation Of Bridge Weigh In Motion System Integrated With Bridge Safety
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Author : Zhisong Zhao
language : en
Publisher:
Release Date : 2012
Simulation Of Bridge Weigh In Motion System Integrated With Bridge Safety written by Zhisong Zhao and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Bridges categories.
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.
Evaluation Of The Bridge Weigh In Motion System
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Author :
language : en
Publisher:
Release Date : 1985
Evaluation Of The Bridge Weigh In Motion System 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 Government publications categories.
This demonstration project allowed Wisconsin Dept. of Transportation to test the overall performance of Bridge weigh in motion equipment as well as develop an entirely new comprehensive and representative truck weight database.
Testing Of Bridge Weigh In Motion System In A Sub Arctic Climate
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Author : P. McNulty
language : en
Publisher:
Release Date : 2003
Testing Of Bridge Weigh In Motion System In A Sub Arctic Climate written by P. McNulty and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Arctic climate categories.
Systems for weighing vehicles while they are in motion are in widespread use in many countries. The accuracy of these weigh-in-motion (WIM) systems is strongly influenced by the road profile and vehicle dynamics. Systems based on sensors that are embedded in the pavement or placed on top of the road surface can measure the axle load only for the fraction of a second for which the wheels are present on the sensor. An alternative to pavement WIM systems that increases the length of the load-sensitive element is to use an existing bridge as a weighing scale (Bridge WIM). A major test of a Bridge WIM system at a test site near the Arctic Circle is described in this paper. The test was conducted along-side a larger test of pavement WIM systems. A large number of trucks from random traffic were weighed statically and the results compared to those from the Bridge WIM system. The accuracy of the system is assessed in accordance with the COST 323 WIM specification, which provides a standardized method of accuracy classification. The Bridge WIM system is proven to perform satisfactorily and consistently for a wide range of temperatures in near-Arctic climatic conditions.
Development Of A Bridge Weigh In Motion System
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Author : Arturo Gonzalez
language : en
Publisher: LAP Lambert Academic Publishing
Release Date : 2010-05
Development Of A Bridge Weigh In Motion System written by Arturo Gonzalez and has been published by LAP Lambert Academic Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-05 with categories.
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.
Investigation Of Improved Accuracy Limits For Dynamic Bridge Weigh In Motion System
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Author : Shakil Ahmad Ansari
language : en
Publisher:
Release Date : 1990
Investigation Of Improved Accuracy Limits For Dynamic Bridge Weigh In Motion System written by Shakil Ahmad Ansari and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with categories.
Evaluation Of Weigh In Motion Systems
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Author : Benjamin H. Cottrell
language : en
Publisher:
Release Date : 1992
Evaluation Of Weigh In Motion Systems written by Benjamin H. Cottrell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Piezoelectric devices categories.
The objective of this research was to evaluate low cost weigh-in-motion systems. The three systems evaluated were (1) a capacitance weigh mat system, (2) a bridge weighing system, and (3) a piezoelectric cable sensor system. All three systems have a two-lane capability. An evaluation was made of (1) the quality of the data, (2) the performance of the equipment, (3) the applications of the equipment and its ease ofuse, and (4) the format of the data and its usefulness. Although objective data were used when possible, the majority of the evaluation is subjective. The quality of the data from each of the three systems is about the same. The piezoelectric cable system provides slightly lower quality data than the other two systems. The equipment of the capacitance weigh mat performed well; that of the bridge system was adequate; and there was concern about the durability of the piezoelectric cable system. Because of the tradeoffs between the capacitance weigh mat system and the bridge system, it is difficult to rank them. The piezoelectric cable system's sensors are permanently installed; therefore, it is not as portable as the other two systems. With regard to the format of the data and its usefulness (which are dependent mostly on the software and not the sensors), the capacitance weigh mat system is flexible and provides individual truck records in two formats, the bridge system provides the most comprehensive tables, and the piezoelectric cable system is limited and depends on other software to generate additional tables. Suggestions are made about how to use the systems and how to improve their performance.
Experimental And Field Investigation Of A Bridge Weigh In Motion Bwim System Improving The Accuracy Of Bridge Inspection Evaluation And Fatigue Assessment
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Author : Sofia Faraz
language : en
Publisher:
Release Date : 2020
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 has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
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.
Ltbp Program S Literature Review On Weigh In Motion Systems
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Author : Imad Al-Qadi
language : en
Publisher:
Release Date : 2016
Ltbp Program S Literature Review On Weigh In Motion Systems written by Imad Al-Qadi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with Bridges categories.
Truck size and weight are regulated using Federal and State legislation and policies to ensure safety and preserve bridge and high infrastructure. Weigh-in-motion (WIM) systems can capture the weight and other defining characteristics of the vehicles actually using the Nation's highways, providing important loading-related data that is essential for evaluating the performance of transportation infrastructure. As part of the Federal Highway Administration's (FHWA) Long-Term Bridge Performance (LTBP) Program's Technical Assistance Contract, a literature review of the state of the practice was performed for WIM systems installed in pavements and on bridges. This literature review focused on the development of WIM systems, concepts for measuring axle loads, the applications of WIM sensors for pavements, and recent advancements in bridge WIM system. This review covers the types, installation, calibration, operations, accuracy, efficiency, effectiveness, and durability of WIM systems, in addition to current Federal and State truck load regulations. This review facilitates selection of the appropriate WIM technology systems for consideration and use to address LTBP Program needs. This literature review serves as a reference document for Pooled Fund Project Number TPF-5(283), The Influence of Vehicular Live Loads on Bridge Performance, which targets the impact of vehicle live loads on bridge component durability.
Use Of Weigh In Motion Systems For Data Collection And Enforcement
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Author : Wiley D. Cunagin
language : en
Publisher:
Release Date : 1986
Use Of Weigh In Motion Systems For Data Collection And Enforcement written by Wiley D. Cunagin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with Transportation categories.
"This synthesis will be of interest to planners, pavement designers, administrators, and others interested in knowing the actual weights of vehicles using the highways. Information is presented on current uses of weigh-in-motion systems that can obtain the data needed to properly plan and design highways."--Avant-propos.