Download or read book Dynamics of Highway Bridges written by Don Albert Linger and published by . This book was released on 1960 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the design of highway bridges, the static live load is multiplied by a factor to compensate for the dynamic effect of moving vehicles. This factor, commonly referred to as an impact factor, is intended to provide for the dynamic response of the bridge to moving loads and suddenly applied forces. Many investigators have published research which contradicts the current impact formula 1, 4, 17. Some investigators feel that the problem of impact deals not only with the increase in over-all static live load but that is an integral part of a dynamic load distribution problem 24. The current expanded highway program with the large number of bridge structures required emphasizes the need for investigating some of the dynamic behavior problems which have been generally ignored by highway engineers. These problems generally result from the inability of a designer to predict the dynamic response of a bridge structure. Many different investigations have been made of particular portions of the overall dynamic problem. The results of these varied investigations are inevitably followed by a number of unanswered questions. Ironically, many of the unanswered questions are those which are of immediate concern in the design of highway bridges, and this emphasizes the need for additional research on the problem of impact.
Download or read book Dynamic Impact Factors for Bridges written by David I. McLean and published by Transportation Research Board. This book was released on 1998 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Dynamics of Highway Bridges a Report on Cooperative Research written by University of Minnesota. Department of Civil Engineering and published by . This book was released on 1949 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dynamics of Bridges Volume 5 written by Tom Proulx and published by Springer Science & Business Media. This book was released on 2011-05-13 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt: This the fifth volume of five from the 28th IMAC on Structural Dynamics and Renewable Energy, 2010, brings together 19 chapters on the Dynamics of Bridges. It presents early findings from experimental as well as computational investigations on the Dynamics of Bridges, including studies on Modeling Environmental Effects on the Dynamic Characteristics of the Tamar Suspension, Structural Health Monitoring of Bridges, Structural Assessment of Damaged Bridges Using Ambient Vibration Testing, and Development of a Tamar Bridge Finite Element Model.
Download or read book Vehicle bridge Interaction Dynamics written by Yeong-Bin Yang and published by World Scientific. This book was released on 2004 with total page 565 pages. Available in PDF, EPUB and Kindle. Book excerpt: The commercial operation of the bullet train in 1964 in Japan marked the beginning of a new era for high-speed railways. Because of the huge amount of kinetic energy carried at high speeds, a train may interact significantly with the bridge and even resonate with it under certain circumstances. Equally important is the riding comfort of the train cars, which relates closely to the maneuverability of the train during its passage over the bridge at high speeds.This book is unique in that it is devoted entirely to the interaction between the supporting bridges and moving trains, the so-called vehicle-bridge interaction (VBI). Finite element procedures have been developed to treat interaction problems of various complexities, while the analytical solutions established for some typical problems are helpful for identifying the key parameters involved. Besides, some field tests were conducted to verify the theories established.This book provides an up-to-date coverage of research conducted on various aspects of the VBI problems. Using the series of VBI elements derived, the authors study a number of frontier problems, including the impact response of bridges with elastic bearings, the dynamic response of curved beam to moving centrifugal forces, the stability and derailment of trains moving over bridges shaken by earthquakes, the impact response of two trains crossing on a bridge, the steady-state response of trains moving over elevated bridges, and so on.
Download or read book Dynamics of Highway Bridges written by J. H. Senne and published by . This book was released on 1961 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The AASHO specifications for highway bridges require that in designing a bridge, the live load must be multiplied by an impact factor for which a formula is given, dependent only upon the length of the bridge. This formula is a result of August Wohler's tests on fatigue in metals, in which he determined that metals which are subjected to large alternating loads will ultimately fail at lower stresses than those which are subjected only to continuous static loads. It is felt by some investigators that this present impact factor is not realistic, and it is suggested that a consideration of the increased stress due to vibrations caused by vehicles traversing the span would result in a more realistic impact factor than now exists. Since the current highway program requires a large number of bridges to be built, the need for data on dynamic behavior of bridges is apparent. Much excellent material has already been gathered on the subject, but many questions remain unanswered. This work is designed to investigate further a specific corner of that subject, and it is hoped that some useful light may be shed on the subject. Specifically this study hopes to correlate, by experiment on a small scale test bridge, the upper limits of impact utilizing a stationary, oscillating load to represent axle loads moving past a given point. The experiments were performed on a small scale bridge which is located in the basement of the Iowa Engineering Experiment Station. The bridge is a 25 foot simply supported span, 10 feet wide, supported by four beams with a composite concrete slab. It is assumed that the magnitude of the predominant forcing function is the same as the magnitude of the dynamic force produced by a smoothly rolling load, which has a frequency determined by the passage of axles. The frequency of passage of axles is defined as the speed of the vehicle divided by the axle spacing. Factors affecting the response of the bridge to this forcing function are the bridge stiffness and mass, which determine the natural frequency, and the effects of solid damping due to internal structural energy dissipation.
Download or read book Traffic Induced Dynamics of a Highway Bridge written by Harlan F. Fricke and published by . This book was released on 1976 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Vehicle Suspension Design on Dynamics of Highway Bridges written by M. F. Green and published by . This book was released on 1995 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Dynamics Response of Short span Highway Bridges to Heavy Vehicle Loads written by Mark Finkle Green and published by . This book was released on 1990 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Seismic Design of Highway Bridges written by Roy A. Imbsen and published by . This book was released on 1981 with total page 634 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dynamic Interaction Between Heavy Vehicles and Highway Bridges written by Eduardo Enrique Taft and published by . This book was released on 2010 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: Three FE models of heavy vehicles were used with three different bridges for computational dynamics analysis using the LS-DYNA computer code. The influence of several factors such as vehicle mass and speed, road surface condition, and loosely secured cargo were assessed. Dynamic load allowance (DLA) was determined for each vehicle-bridge combination. Practical conclusions regarding methods to mitigate DLAs were presented.
Download or read book Dynamic Response of Highway Bridges Subjected to Heavy Vehicles written by Hongyi Li and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dynamic Response of Highway Bridges written by Bruce Douglas and published by . This book was released on 1982 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Blast resistant Highway Bridges written by Eric B. Williamson and published by Transportation Research Board. This book was released on 2010 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: Explores code-ready language containing general design guidance and a simplified design procedure for blast-resistant reinforced concrete bridge columns. The report also examines the results of experimental blast tests and analytical research on reinforced concrete bridge columns designed to investigate the effectiveness of a variety of different design techniques.
Download or read book The Art and Science of Dynamic Testing of Highway Bridges written by and published by . This book was released on 1990 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first and second editions of the Ontario Highway Bridge Code contained provisions for dynamic loads in a new format. This format was intended to represent, in an approximate fashion, the mechanics of vehicle and bridge dynamic interaction for the spectrum of both bridges and trucks on Ontario's highway system. Test data available in the literature was generally inadequately defined or detailed to support development of these provisions in a limit states format. A series of major dynamic tests of bridges was conducted in support of development of these dynamic load provisions. This paper reviews test procedures, and recommends standard methods that might be used for dynamic testing of highway bridges. The method of data analysis is of fundamental importance in gaining information from the test that can be useful either for purposes of research, bridge evaluation, or bridge code development. The paper also recommends methods of data analysis, for both bridge dynamic characteristics and bridge dynamic response. For the covering abstract of the Conference see IRRD Abstract No. 807839.
Download or read book Dynamic Behavior of Simple span Highway Bridges written by Robert K. Wen and published by . This book was released on 1962 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Assessment of Highway Bridge Dynamics Due to Traffic Loading written by Daniel Cantero Lauer and published by . This book was released on 2010 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:
