Cable Vibrations in Cable-stayed Bridges PDF Download
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Author: Elsa de Sá Caetano (autor.)
Publisher: IABSE
ISBN: 3857481153
Category : Cable-stayed bridges
Languages : en
Pages : 191
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Book Description
The present book provides a comprehensive survey on the governing phenomena of cable vibration, both associated with direct action of wind and rain: buffeting, vortex-shedding, wake effects, rain-wind vibration; and resulting from the indirect excitation through anchorage oscillation: external and parametric excitation. Methodologies for assessment of the effects of those phenomena are presented and illustrated by practical examples. Control of cable vibrations is then discussed and state-of-art results on the design of passive control devices are presented.
Author: Elsa de Sá Caetano (autor.)
Publisher: IABSE
ISBN: 3857481153
Category : Cable-stayed bridges
Languages : en
Pages : 191
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Book Description
The present book provides a comprehensive survey on the governing phenomena of cable vibration, both associated with direct action of wind and rain: buffeting, vortex-shedding, wake effects, rain-wind vibration; and resulting from the indirect excitation through anchorage oscillation: external and parametric excitation. Methodologies for assessment of the effects of those phenomena are presented and illustrated by practical examples. Control of cable vibrations is then discussed and state-of-art results on the design of passive control devices are presented.
Author: Nazim Nariman
Publisher: GRIN Verlag
ISBN: 3656588791
Category : Technology & Engineering
Languages : en
Pages : 36
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Book Description
Research Paper (postgraduate) from the year 2014 in the subject Engineering - Civil Engineering, grade: unknown, University of Weimar, language: English, abstract: The vibration characteristic of a cable stayed bridges structure is the main axis of the study in this paper, many structural parameters are used to simulate and determine the effect of vibration on the structural performance by identifying the natural frequencies of the system and the mode shapes that can occur in the real structure. Modeling the stay cables with three famous styles of arrangements such as Harp, Semi Harp and Fan styles, and assigning roller, hinged and fixed boundary conditions on the deck support of the cable stayed bridge, in addition to using two design cases of the girders and pylons dimensions in the global structure for that purpose. Through the use of ABAQUS finite element analysis, the models were generated for each mentioned cases and the results of the frequency linear perturbation step of 10 mode shapes were determined through the simulation of the deformed shapes and the determined values of the natural frequencies of each mode for each case of interest. It was seen that the roller boundary condition was much prone to the early vibration and the stay cables of the direction near to the roller support were vibrated and stressed much more than the other direction compared with the hinged and fixed boundary conditions, and the mode shapes 7, 8, 9 and 10 were the most vibrated cases for all the boundary conditions without any distinction. The week design of the girders and the pylons has the great effect on the vibration of the stay cables, pylons and deck of the structure especially near the roller support direction due to the early vibration of the case of roller support, so the use of cross ties and damping between the stay cables and the girders are very important in the cases of significant vibrations which affect the performance of the cable stayed bridges.
Author: Niels J. Gimsing
Publisher: John Wiley & Sons
ISBN: 1119951879
Category : Technology & Engineering
Languages : en
Pages : 760
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Book Description
Fourteen years on from its last edition, Cable Supported Bridges: Concept and Design, Third Edition, has been significantly updated with new material and brand new imagery throughout. Since the appearance of the second edition, the focus on the dynamic response of cable supported bridges has increased, and this development is recognised with two new chapters, covering bridge aerodynamics and other dynamic topics such as pedestrian-induced vibrations and bridge monitoring. This book concentrates on the synthesis of cable supported bridges, suspension as well as cable stayed, covering both design and construction aspects. The emphasis is on the conceptual design phase where the main features of the bridge will be determined. Based on comparative analyses with relatively simple mathematical expressions, the different structural forms are quantified and preliminary optimization demonstrated. This provides a first estimate on dimensions of the main load carrying elements to give in an initial input for mathematical computer models used in the detailed design phase. Key features: Describes evolution and trends within the design and construction of cable supported bridges Describes the response of structures to dynamic actions that have attracted growing attention in recent years Highlights features of the different structural components and their interaction in the entire structural system Presents simple mathematical expressions to give a first estimate on dimensions of the load carrying elements to be used in an initial computer input This comprehensive coverage of the design and construction of cable supported bridges provides an invaluable, tried and tested resource for academics and engineers.
Author: Sunwoo Park
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 101
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Book Description
Cable-stayed bridges have been recognized as the most efficient and cost effective structural form for medium-to-long-span bridges over the past several decades. With their widespread use, cases of serviceability problems associated with large amplitude vibration of stay cables have been reported. Stay cables are laterally flexible structural members with very low inherent damping and thus are highly susceptible to environmental conditions such as wind and rain/wind combination. Recognition of these problems has led to the incorporation of different types of mitigation measures on many cablestayed bridges around the world. These measures include surface modifications, cable crossties, and external dampers. Modifications to cable surfaces have been widely accepted as a means to mitigate rain/wind vibrations. Recent studies have firmly established the formation of a water rivulet along the upper side of the stay and its interaction with wind flow as the main cause of rain/wind vibrations. Appropriate modifications to exterior cable surfaces effectively disrupt the formation of a water rivulet. The objective of this study is to supplement the existing knowledge base on some of the outstanding issues of stay cable vibrations and to develop technical recommendations that may be incorporated into design guidelines. Specifically, this project focuses on the effectiveness of cable crossties, external dampers, and the combined use of crossties and dampers. Finite element simulations are carried out on the stay cable systems of constructed stay cable bridges under realistic wind forces in order to address these issues. Explicit time-history analysis enabled the performance of stay cable systems with different mitigation strategies to be assessed and compared for their relative advantages and disadvantages.
Author: Habib Tabatabai
Publisher: Transportation Research Board
ISBN: 0309097606
Category : Technology & Engineering
Languages : en
Pages : 214
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Book Description
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 353: Inspection and Maintenance of Bridge Stay Cable Systems identifies and explains various inspection and maintenance techniques for bridge stay cable systems. It discusses both short- and long-term approaches. The report information on methods for inspections and assessments, including nondestructive testing and evaluation procedures; repair and retrofit; methods for control of cable vibrations, including rainwind vibrations; stay cable fatigue and failure; effectiveness of various inspection and repair methods; limitations of available technologies; and trends and recommendations for future study.
Author: Chien Ming Wang
Publisher: Springer Nature
ISBN: 9811580790
Category : Technology & Engineering
Languages : en
Pages : 2093
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Book Description
This book presents articles from The 16th East Asian-Pacific Conference on Structural Engineering and Construction, 2019, held in Brisbane, Australia. It provides a forum for professional engineers, academics, researchers and contractors to present recent research and developments in structural engineering and construction.
Author: Yozo Fujino
Publisher: Springer Science & Business Media
ISBN: 4431540466
Category : Technology & Engineering
Languages : en
Pages : 264
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Book Description
For long-span bridges, wind action is a dominant factor in their safety and serviceability. A large number of long-span bridges have been built in Japan over the past 30 years, and tremendous amounts of research and technical development have been accomplished in wind-resistant design. This book is a compilation of the results of active research and development. Wind-resistant design standards generated in Japan are described in the first few chapters. Then comes information such as design wind speed, structural damping, wind tunnel tests, and analyses, which provide the basis of the design standards. Wind-induced vibrations and their control of girders, towers, cables, and other features are explained with examples of field measurements. Comprehensive listings of Japanese experience in vibration control are also presented. Because achieving particularly dynamic safety against wind is still not an easy task, these data and information will be valuable assets for the wind-engineering and bridge-engineering communities.
Author: Harold R. Bosch
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 167
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Book Description
Cable-stayed bridges have been recognized as the most efficient and cost effective structural form for medium to long span bridges over the past several decades. With their widespread use, cases of serviceability problems associated with large amplitude vibration of stay cables have been reported. Stay cables are laterally flexible structural members with very low inherent damping and thus are highly susceptible to environmental conditions such as wind and rain/wind combination. Recognition of these problems led to the incorporation of different types of mitigation measures on many cable-stayed bridges around the world. These measures included surface modifications, cable crossties and external dampers. Modification of cable surfaces has been widely accepted as a means to mitigate rain/wind vibrations. Recent studies have firmly established the formation of a water rivulet along the upper side of the stay and its interaction with wind flow as the main cause of rain/wind vibrations. Appropriate modification of exterior cable surface effectively disrupts the formation of a water rivulet. The objective of this study was to supplement the existing knowledge base on some of the outstanding issues of stay cable vibrations and develop technical recommendations that may be incorporated into design guidelines. Specifically, this project focused on identification of in-situ cable dynamic properties and performance of external viscous dampers on the Penobscot Narrows Bridge. Forced vibration tests were conducted on the stay cables during the latter stages of construction, just prior to and following installation of viscous dampers. Cable properties, such as vibration frequencies and damping levels, were established and compared with design targets.
Author: Rene Walther
Publisher: Thomas Telford
ISBN: 9780727727732
Category : Technology & Engineering
Languages : en
Pages : 240
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Book Description
An examination of all aspects of the design of cable stayed bridges. Starting with a brief history, it addresses general design criteria and technology, as well as static and dynamic analysis. The illustrations provide examples of structures already built and document their critical parameters.
Author:
Publisher:
ISBN: 9781642241983
Category :
Languages : en
Pages : 334
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Book Description
Cable stayed bridges have only become an established solution for long span structures over the last 60 years. This recent ascendency is primarily due to the development of reliable high strength steels for the cables and perhaps more importantly, the advent and widespread use of computers to analyze the complex mathematical models. Cable-stayed bridges are preferred these days as they provide much greater stiffness than the suspension bridge and deformations of the deck under live loads are reduced. A cable stayed bridge has one or more pylons, from which cables support the deck of the bridge. A distinctive feature of the bridge is the cables which run directly from tower to deck, normally forming a fan like pattern or a series of parallel line. The main objective of this book is to review the various wind effects and the different vibrations which are induced due to the wind on cable-stayed bridges. Cable-stayed bridges being more flexible, a proper wind study is inevitable.Wind Effects on Cable-Supported Bridges provides in-depth information to understanding wind effects on cable-stayed bridges; this book uses analytical, numerical and experimental methods to give readers a fundamental and practical understanding of the subject knowledge. It describes the structural behavior of cable-stayed bridges, identifies cable-stayed bridge elements, and discusses their role in supporting the structure. It presents methods of pre-sizing the stays and describes the mathematical procedure that allows optimal tensioning of forces in the stays, so that the structure complies with the design criteria. This book is intended to supplement information from introductory areas through to advanced topics currently being developed from research work. Cable-stayed bridges under wind loading exhibit dynamic behaviors that depend on the aero elastic forces and coupling among vibration modes.
