Cable Vibrations in Cable stayed Bridges

Bridges. 6.1. General. Once the mechanisms that generate cable vibration have been identified, appropriate coun- termeasures to reduce or suppress large oscillations should be taken. These countermeasures can be implemented at the ...

Author: Elsa de Sá Caetano (autor.)

Publisher: IABSE

ISBN: 3857481153

Category: Cable-stayed bridges

Page: 191

View: 781

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.


Cable Stayed Bridges

Introduction In order to disentangle somehow the multiple aspects of cable stayed bridges , their basic load - bearing elements — cables , deck and pylons — are dealt with separately . This artificial division may not , however , be ...

Author: René Walther

Publisher: Thomas Telford

ISBN: 9780727727732

Category: Technology & Engineering

Page: 238

View: 847

The book examines all aspects of the design of cable stayed bridges. Starting with a brief history, it addresses general design criteria and current technology, as well as static and dynamic analysis. The numerous illustrations provide examples of existing structures and document their critical parameters, including examples of outstanding structures which have recently been completed. The chapter dealing with stay technology has been thoroughly updated to take into account the new, better quality products available from cable suppliers. The results of extensive experimental investigations concerning cable stayed bridges with slender decks, mentioned briefly in the first edition, are also presented here.

Planning and Design of Bridges

1.8 AN ERA OF CABLE - STAYED BRIDGES During the past three decades cable - stayed bridges found wide application especially ... A comparison between modern types of suspension bridges and the cablestayed bridge indicates that the cable ...

Author: M. S. Troitsky

Publisher: John Wiley & Sons

ISBN: 9780471028536

Category: Technology & Engineering

Page: 344

View: 634

Timely, authoritative, extremely practical--an exhaustive guide tothe nontheoretical aspects of bridge planning and design. This bookaddresses virtually all practical problems associated with theplanning and design of steel and concrete bridge superstructuresand substructures. Drawing on its author's nearly half-century as abridge designer and engineer, it offers in-depth coverage of suchcrucial considerations as selecting the optimum location andlayout, traffic flow, aesthetics, design, analysis, construction,current codes and government regulations, maintenance andrehabilitation, and much more. * Offers in-depth coverage of all the steps involved in performingproper planning and design with comparative analyses of alternativesolutions * Includes numerous examples and case studies of existing bridgesand important projects underway around the world * Features a time-line history of bridge building from pre-Romantimes to the present * Summarizes key technical data essential to bridgeengineering * Supplemented with 200 line drawings and photos vividlyillustrating all concepts presented * Comprehensive coverage of CAD planning, design, and analysistechniques and technologies

Cable Stayed Bridges

Table 2.1 Rhine River Bridges Name Year completed Type Kleve—Emmerich 1965 Suspension bridge, Federal road Rees—Kalkar 1967 Cable-stayed bridge, Federal road A 42 1990 Cable-stayed bridge, Freeway bridge Duisburg-Neuenkamp 1970 ...

Author: Holger Svensson

Publisher: John Wiley & Sons

ISBN: 3433602298

Category: Technology & Engineering

Page: 458

View: 369

The need for large-scale bridges is constantly growing due to the enormous infrastructure development around the world. Since the 1970s many of them have been cable-stayed bridges. In 1975 the largest span length was 404 m, in 1995 it increased to 856 m, and today it is 1104 m. Thus the economically efficient range of cable-stayed bridges is tending to move towards even larger spans, and cable-stayed bridges are increasingly the focus of interest worldwide. This book describes the fundamentals of design analysis, fabrication and construction, in which the author refers to 250 built examples to illustrate all aspects. International or national codes and technical regulations are referred to only as examples, such as bridges that were designed to German DIN, Eurocode, AASHTO, British Standards. The chapters on cables and erection are a major focus of this work as they represent the most important difference from other types of bridges. The examples were chosen from the bridges in which the author was personally involved, or where the consulting engineers, Leonhardt, Andrä and Partners (LAP), participated significantly. Other bridges are included for their special structural characteristics or their record span lengths. The most important design engineers are also presented. Note: The lecture videos which are attached to the print book on DVD are not part of the e-book.

Inspection and Maintenance of Bridge Stay Cable Systems

The same questionnaire was also sent to all members of the Post-Tensioning Institute's (PTI) Cable-Stayed Bridge Committee, as well as major U.S. and Mexican stay cable sup- pliers and testing companies. Table 1 cites those states and ...

Author: Habib Tabatabai

Publisher: Transportation Research Board

ISBN: 0309097606

Category: Bridges

Page: 214

View: 280

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.

Leonhardt cable stayed bridges keynote lecture 10th FIP congress New Delhi

The number of cable stayed bridges has tremendously increased during the last years. In the Japanese journal 'Bridge and Foundation Engineering' of August 1985111 we find an almost complete survey of cable stayed bridges in the world ...

Author: FIB – International Federation for Structural Concrete

Publisher: FIB - International Federation for Structural Concrete

ISBN:

Category: Technology & Engineering

Page: 29

View: 930


Nonlinear structural design optimization of cable stayed bridges

The history of cable stayed bridges dates back to 1595, and have been constructed all over the world. The Swedish Stromsund Bridge, designed in 1955, is known as the first modern cable-stayed bridge (Wilson and Gravelle).

Author: Nazim Nariman

Publisher: GRIN Verlag

ISBN: 3656550220

Category: Technology & Engineering

Page: 94

View: 730

Scientific Study from the year 2013 in the subject Engineering - Civil Engineering, grade: -, University of Weimar, course: Cable Stayed Bridges, language: English, abstract: In this research, many models of a cable stayed bridge were generated using ABAQUS finite element commercial software for the purpose of proceeding with nonlinear design optimization on the shape and topology of the structure. The cable stayed bridge models in all cases are with a constant length and width for the deck, also the pylons height under and above the deck is constant, but the shape of stay cables arrangement varies to three main famous arrangements which are Fan, Semi harp and Harp.In addition to change in the pylons shape which are three known shapes Double out, Single Center and Single inclined out, and it is worthy to mention that in all cases of the shape optimization of the pylons , the stay cables arrangements are Fan style, andby governing computational nonlinear optimization process on the finite element models in all cases of shape and topology optimization through using static general step for analysis and a certain meshing type with global seeding size for the Beam elements, with a fixed and pinned boundary conditions for the deck supports and fixed boundary for the pylons.Concentrated static loads assigned on the same positions on the deck for all models cases. A numerical optimization and graphical simulation of the results were used to determine many responsesin the model cases which areReactions, Deflections and Mises stresses in the structural models of the cable stayed bridge, especially at the deck, pylons and the stay cables which are the main components of the structure, also the same step in the deck and pylons supportshas been done for optimization outputs. It is apparent and clear that the cable stayed model with the Fan arrangement of the stay cables showed efficiency and the best topological model case for the structural design optimization that involved a safe, robust, rigid, and safe for the design of cable stayed bridges. The pylon shape with double out case was the best design situation compared with the other two models single center and single inclined out shapes, this point was obvious in the reactions, deflections and Mises stresses for the deck supports and the deck itself, and as a result the Double out with a Fan shape arrangement of the cable stays is the best model for the design of cable stayed bridges to resist the static loads.

Vibration and Mode Shapes Analysis of Cable Stayed Bridges Considering Different Structural Parameters

The progressive lengthening of the spans of cable-stayed bridges has strongly increased the importance of understanding the dynamic behavior of cable-stayed bridges. As slender, flexible and typically three-dimensional structures, ...

Author: Nazim Nariman

Publisher: GRIN Verlag

ISBN: 3656588791

Category: Technology & Engineering

Page: 33

View: 591

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.

Cable Supported Bridges

'Outline Design and Special Studies for a 1200 m Cable-Stayed Bridge', Proceedings of the International Symposium for Innovation in Cable-Stayed Bridges. Fukuoka. 91.5 Otsuka, H.et al., 1991. 'Fundamental Study for Design and Erection ...

Author: Niels J. Gimsing

Publisher: John Wiley & Sons

ISBN: 1119951879

Category: Technology & Engineering

Page: 512

View: 210

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.