Dynamic Response of Certain Types of Highway Bridges to Moving Vehicles
Author: Kai Deng
Publisher:
Published: 2000
Total Pages: 274
ISBN-13:
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Author: Kai Deng
Publisher:
Published: 2000
Total Pages: 274
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DOWNLOAD EBOOKAuthor: Ahmed Hassan Kashif
Publisher:
Published: 1992
Total Pages: 616
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DOWNLOAD EBOOKAuthor: Kiranchandra Maganlal Vashi
Publisher:
Published: 1970
Total Pages: 570
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DOWNLOAD EBOOKAuthor: John M. Biggs
Publisher:
Published: 1958
Total Pages: 250
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DOWNLOAD EBOOKAuthor: Herbert S. Suer
Publisher:
Published: 1955
Total Pages: 188
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DOWNLOAD EBOOKAuthor: Swapan Kumar Chaudhuri
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Published: 1977
Total Pages: 590
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DOWNLOAD EBOOKAuthor: Muhammad Uzair Khan
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Published: 1997
Total Pages: 360
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DOWNLOAD EBOOKAuthor: Hongyi Li
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Published: 2005
Total Pages:
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DOWNLOAD EBOOKAuthor: Shabnam Darjani
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Published: 2013
Total Pages: 164
ISBN-13:
DOWNLOAD EBOOKThrough the development and usage of high-strength materials, the design of more flexible bridges is unavoidable. It is assumed that limiting a bridge static deflection would control the excessive vibration caused by more flexible design. However, results of prior studies indicate that deflection limits do not necessarily address bridges vibrational issue. This dissertation addresses the parameters affecting bridge vibration and provides simple equations to compute bridge dynamic acceleration, velocity and displacement in both transient and steady state parts of the vibration. These equations can then be used to control bridges excessive vibration; and provide human comfort and structural performance. A comprehensive analytical study was performed to evaluate dynamic response of bridges under a moving truck load. The effect of bridge dynamic parameters and vehicle moving conditions are investigated, which includes bridge frequency, damping ratio, span length, girders distance, bracing, support conditions, truck speed, load sequence, axle's weight, and number of spans. Bridge and vehicle k-parameters, which represent the number of vibration cycles before the next excitation occurs, are developed to better explain the vibrational behavior of a bridge. The proposed equations include bridge frequency, static deflection for one axle load, and k-parameters. Finally, a case study is presented to highlight the application of the new approach.
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.