Dynamic Impact Factors For Bridges

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Dynamic Impact Factors For Bridges


Dynamic Impact Factors For Bridges
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Dynamic Impact Factors For Bridges


Dynamic Impact Factors For Bridges
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Author : David I. McLean
language : en
Publisher: Transportation Research Board
Release Date : 1998



Dynamic Impact Factors For Bridges written by David I. McLean and has been published by Transportation Research Board this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Technology & Engineering categories.


This synthesis will be of interest to state department of transportation and consulting bridge, structural, and research engineers. The synthesis describes the current state of the practice for determining dynamic impact factors for bridges. Information for the synthesis was collected by surveying U.S. and Canadian transportation agencies and by conducting a literature search using domestic and foreign sources. This report of the Transportation Research Board documents relevant background and recent information with regard to vehicular dynamic load effects on bridges. It provides details on the basic concepts of bridge dynamics, including identification of the main variables affecting bridge dynamic response. In addition, current code provisions for accounting for vehicular dynamic load effects for new bridge design and load evaluation of existing bridges are reported, including a discussion on the background of the provisions. Finally, a discussion of observed field problems associated with vehicular dynamic load effects, as obtained from the survey, are included.

Dynamic Impact Factors For Bridges


Dynamic Impact Factors For Bridges
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Author :
language : en
Publisher:
Release Date : 1998



Dynamic Impact Factors For Bridges written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with categories.




Investigation Of The Effect Of Speed On The Dynamic Impact Factor For Bridges With Different Entrance Condition


Investigation Of The Effect Of Speed On The Dynamic Impact Factor For Bridges With Different Entrance Condition
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Author : Brent M. Phares
language : en
Publisher:
Release Date : 2016



Investigation Of The Effect Of Speed On The Dynamic Impact Factor For Bridges With Different Entrance Condition written by Brent M. Phares 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.


The dynamic interaction of vehicles and bridges results in live loads being induced into bridges that are greater than the vehicle's static weight. To limit this dynamic effect, the Iowa Department of Transportation (DOT) currently requires that permitted trucks slow to five miles per hour and span the roadway centerline when crossing bridges. However, this practice has other negative consequences such as the potential for crashes, impracticality for bridges with high traffic volumes, and higher fuel consumption. The main objective of this work was to provide information and guidance on the allowable speeds for permitted vehicles and loads on bridges .A field test program was implemented on five bridges (i.e., two steel girder bridges, two pre-stressed concrete girder bridges, and one concrete slab bridge) to investigate the dynamic response of bridges due to vehicle loadings. The important factors taken into account during the field tests included vehicle speed, entrance conditions, vehicle characteristics (i.e., empty dump truck, full dump truck, and semi-truck), and bridge geometric characteristics (i.e., long span and short span). Three entrance conditions were used: As-is and also Level 1 and Level 2, which simulated rough entrance conditions with a fabricated ramp placed 10 feet from the joint between the bridge end and approach slab and directly next to the joint, respectively. The researchers analyzed and utilized the field data to derive the dynamic impact factors (DIFs) for all gauges installed on each bridge under the different loading scenarios.

Evaluation Of Dynamic Impact Factors For Steel Highway Bridges


Evaluation Of Dynamic Impact Factors For Steel Highway Bridges
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Author : Sylvester E. Uwanaka
language : en
Publisher:
Release Date : 1989



Evaluation Of Dynamic Impact Factors For Steel Highway Bridges written by Sylvester E. Uwanaka and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Bridges categories.




Heavy Vehicles On Minor Highway Bridges


Heavy Vehicles On Minor Highway Bridges
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Author : P. H. Kirkegaard
language : en
Publisher:
Release Date : 1997



Heavy Vehicles On Minor Highway Bridges written by P. H. Kirkegaard 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.




Dynamic Impact Factor Evaluation For Short Span Steel Railway Bridges


Dynamic Impact Factor Evaluation For Short Span Steel Railway Bridges
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Author : Mehrdad Bisadi
language : en
Publisher:
Release Date : 2019



Dynamic Impact Factor Evaluation For Short Span Steel Railway Bridges written by Mehrdad Bisadi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Bridges categories.


The Dynamic Impact Factor (DIF) is widely employed to account for the dynamic amplification effect of moving trains on railway bridges. An accurate DIF provides a safe yet economical basis for new railway bridges and improves the safety rating assessment for existing railway bridges. This thesis investigates the accuracy, reliability and the underlying influence factors for DIF relationships currently used for short span steel railway bridges. Full-scale field monitoring exercises are conducted to measure the dynamic responses of two railway bridges during various train passages. The monitoring results indicate that both railway bridges satisfy the live load deflection limits recommended for railway bridges subjected to low-speed trains. Three-dimensional Finite Element (FE) models are developed for the each of railway bridges. The models are verified against the monitoring results. The verification results show that the models accurately predict the actual dynamic response of the railway bridges. A series of sensitivity analysis is performed using the verified FE models. The analyses investigate the effects of variation in New Zealand train and bridge dynamic characteristics on the mid-span DIFs of the monitored railway bridges. The trains are simulated as moving constant forces. The analysis results show that the train speeds have the largest influence on the DIFs of the railway bridges. Numbers and axle distances of carriages have some effects on the DIFs which these effects depend on corresponding locomotive axle distances. Bridge damping ratios have some influences, and the train axle loads have no effect on the DIFs. Over 100 different train arrangements corresponding to combinations possible in New Zealand are simulated and applied to the each of the FE modes. The mid-span DIFs are evaluated numerically as the simulated train passes over the bridges with different speeds. It is found that the DIF formulas in New Zealand railway bridge guidelines overestimate the dynamic effects of moving trains on the railway bridges. This overestimation approaches 4.2 times the bridge evaluated DIFs. Data mining techniques are employed to generate predictive models which estimate the medians of the simulated DIFs. These predictive models provide users with a reliable prediction of the DIFs for designing or assessing the short span steel railway bridges subjected to train passages with speeds up to 150 km/h.

Vehicle Bridge Interaction Dynamics


Vehicle Bridge Interaction Dynamics
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Author : Yeong-Bin Yang
language : en
Publisher: World Scientific
Release Date : 2004



Vehicle Bridge Interaction Dynamics written by Yeong-Bin Yang and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Technology & Engineering categories.


The commercial operation of the bullet train in 1964 in Japan markedthe beginning of a new era for high-speed railways. Because of thehuge amount of kinetic energy carried at high speeds, a train mayinteract significantly with the bridge and even resonate with it undercertain circumstances. Equally important is the riding comfort of thetrain cars, which relates closely to the maneuverability of the trainduring its passage over the bridge at high speeds.