Dynamic Behavior of Highway Bridges
Author: Robert J. Reilly
Publisher:
Published: 1964
Total Pages: 168
ISBN-13:
DOWNLOAD EBOOKRead and Download eBook Full
Author: Robert J. Reilly
Publisher:
Published: 1964
Total Pages: 168
ISBN-13:
DOWNLOAD EBOOKAuthor: Robert K. Wen
Publisher:
Published: 1962
Total Pages: 62
ISBN-13:
DOWNLOAD EBOOKAuthor: Reto Cantieni
Publisher:
Published: 1992
Total Pages: 240
ISBN-13:
DOWNLOAD EBOOKAuthor: Robert J. Reilly
Publisher:
Published: 1966
Total Pages: 68
ISBN-13:
DOWNLOAD EBOOKAuthor: Robert Kuo-Liang Wen
Publisher:
Published: 1957
Total Pages: 236
ISBN-13:
DOWNLOAD EBOOKAuthor:
Publisher:
Published: 1992
Total Pages: 240
ISBN-13:
DOWNLOAD EBOOKAuthor: David I. McLean
Publisher: Transportation Research Board
Published: 1998
Total Pages: 72
ISBN-13: 9780309068192
DOWNLOAD EBOOKThis 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.
Author: Don Albert Linger
Publisher:
Published: 1960
Total Pages: 115
ISBN-13:
DOWNLOAD EBOOKIn 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.
Author: Reto Cantieni (Constructeur de ponts, Suisse)
Publisher:
Published: 1992
Total Pages: 240
ISBN-13:
DOWNLOAD EBOOKAuthor: J. H. Senne
Publisher:
Published: 1961
Total Pages: 0
ISBN-13:
DOWNLOAD EBOOKThe 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.