Analysis of cablestayed bridges subjected to severe wind. A continuous part of the bridge deck that is supported only by staycables and pylons, or are free spans. The combination of multiple simple systems allows for a structure where the role of each of its components is well defined. The example bridge is a longspan cablestayed bridge of a 605 m central span length with steel box girder and reinforced concrete towers under construction in china. The earliest known surviving example of a true cablestayed bridge in the united states is e. Sap2000 bridge tutorial pdf 7mb pdf concrete boxgirder, steelgirder, and cablestayed bridge tutorials. Introduction cables stretch diagonally between these pillars or towers and the beam.
Cablestayed bridge as an alternative for medium and short. A cablestayed bridge has one or more towers or pylons, from which cables support the. Cable stayed bridge with harp arrangement of cables c description of bridge analysis is made for cable stayed bridge. The cablestayed bridge is related to the cantilever bridge. The author discusses the design, analysis and construction of two innovative precast, prestressed concrete cablestayed bridges recently built in the czech republic. On the structural analysis and design of cablestayed and. A finite element fe model for a cable stayed bridge. The posttensioning institutes pti recommendations for stay cable design, testing and installation provide explicit design guidance for abrupt cable loss as. In us practice, cable stayed bridges are the only long span bridge form routinely designed for member cable loss. The key element for both suspension bridge and a cablestayed bridge is the cable. Cable stayed bridges have been around for about 40 years ago.
Cable stayed bridges are extremely elegant and very effective structures and they are also architectural landmarks. Bridge design requires experienced personnel knowledgeable in stateoftheart techniques and methodol ogies. A big difference between cantilever bridges and cablestayed bridges is that the former usually have a suspended span, and the latter. A new program for the design of cablestayed bridges. Henderson office of infrastructure research and development notice. In this thesis, cable stayed bridge is analyzed by changing he cables arrangement each time, to obtain the results for bending moment, forces, deflection. Sap2000 bridge tutorial pdf 7mb pdf concrete boxgirder, steelgirder, and cable stayed bridge tutorials. Thus, there are three main objectives for this research, which are the effect of sudden loss of critical cables, cable loss due to blast loadings and progressive collapse triggered by the earthquake.
Shape and sizing optimization of boxgirder decks of cable. Introduction cablestayed bridges are structural systems which are effectively composed of cables, the main girder and towers. Analysis of the performance of cablestayed bridges under. Mar 12, 2015 a cable stayed bridge lacks the great rigidity of a trussed cantilever, and the continuous beam compensates for this to some extent. Alternatives in the design and construction of cable. Europes largest single pylon stay cable bridge bbr adria. Introduction the influence of cables and stiffening girder parameters on deformations and strains in the cablestayed bridge system are presented in previous publications 1. Feb 02, 2016 the oldest application of the cable stayed bridge concept was found in the 17th century but the use of this design was prominently seen throughout the 1800s. Analysis for the following analysis, the model of a cablestayed bridge scheme, like the one of figure 1, is adopted. Cantilever casting concrete arch bridge using form traveller has a broad application. The cable stayed bridge is one of the modern bridges which were built for the longer spans.
The various response quantities bending moment,sf,afwith varying pylon shape and configuration with varying central span has been compared. An introduction to cablestayed bridges construction. Early chinese people used the cablestayed system to construct suspension bridges out of hemp rope and iron chains. However, the cablestayed bridge concept offers more and can adapt to very special boundary conditionsthe outcome may be e. A study on progressive collapse response of cablestayed. Krzysztof zoltowski and tomasz wask 2008, presented dynamic analysis and site test of cablestayed bridge over vistula river in plock. In this paper the cablestayed bridge design problem is posed in a multiobjective optimization format with goals of minimum cost and stress and a pareto solution is sought. The posttensioning institutes pti recommendations for stay cable design, testing and installation provide explicit design guidance for abrupt cable loss as well as cable replacement 1. The discussion is focused more on practical knowledge rather than on theoretical calculations. Attached is a model file and a pdf which outlines the procedure for modeling a concrete boxgirder bridge, a steelgirder bridge, and a cablestayed bridge. This bridge form has a finelooking appearance and fits in with most surrounding environments 1. The design of cablestayed bridges, in comparison with the normal bridges, is controlled by the construction sequence, and the construction loads tend to be the dominant design loading. Early chinese people used the cable stayed system to construct suspension bridges out of hemp rope and iron chains.
A possibility was found to reduce the bending stiffness of girder and. An optimum design of a cablestayed bridge with minimum cost while achieving strength and serviceability requirements is a challenging task. Tutorial included in the sap2000 bridgeexamples document. Dynamic analysis in the form of time history analysis and aerostatic effect has been considered. Also an example of a cable stayed bridge is presented in chapter 2. The spans can be constructed as cantilevers until they are joined at the centre. General data of the bridge according to the given conditions and the accepted concept of precast superstructures the bridge is designed as a cable stayed beam, with two spans 14. The bridge concept include a semifan, central suspended span and selfsupported cablestayed system. In this study, the modelling of cable stayed bridge has been done for six different types of pylons shape i. The bridge deck is made of timber, and the frame from aluminium, so the solid parts of the structure are quite flexible.
When a cable stayed bridge is chosen, the initial design phase is of utmost importance. This thesis will examine the main issues regarding cables. In the following, the influence of the cable layout on the overall bridge stability is. In germany, particularly in rhine and elbe rivers, these kinds of bridges were built to replace the bridges that were destroyed during the world war ii and these improve the highway transportation system. The key element for both suspension bridge and a cable stayed bridge is the cable. Also an example of a cablestayed bridge is presented in chapter 2. The large span and multi cable semiharp pattern is representative of the present trend on such structures. Back span to main span ration while fixing the basic arrangement of cable stayed bridge should be such that it should be always less than 0. The deck is made of three spans, the central one of 150 m and two lateral ones of 75 m each. Introduction cable stayed bridges are structural systems which are effectively composed of cables, the main girder and towers.
Attached is a model file and a pdf which outlines the procedure for modeling. For a bridge with a 1800 m 5902 ft main span and 38 m 125 ft width, a suspension bridge needs 46000 t 50700 tons of steel whereas a cable stayed bridge only needs 19200 t 21170 tons of steel see fig. You may have seen this stru cture in the structures lab or the engineering workrooms. Cablestayed bridge tutorials computers and structures. Buy analysis and design of cable stayed bridge book online at best prices in india on. Numerical models used for the calculation of the cablestayed. An image of a model taken from the sap2000 bridge examples document is shown in figure 1. The difficulties encountered in the analysis of cable stayed bridges with standard software and the opportunity offered by the technical progress in computer hard and software appeared to be two good reasons to start the development of a computer program specially tailored on the requirements of cable stayed bridge designers. List of longest cablestayed bridge spans wikipedia.
The definition of cablestayed bridge deck length used here is. Reducing the cost of a cablestayed bridge the objective of this paper is to encourage engineers to consider the possibility of. The cables are in tension, and the deck is in compression. The difficulties encountered in the analysis of cablestayed bridges with standard software and the opportunity offered by the technical progress in computer hard and software appeared to be two good reasons to start the development of a computer program specially tailored on the requirements of cablestayed bridge designers. In the longitudinal direction, the bridge is symmetric with respect to the midspan, and it include two towers and two set of cables. Span length of cable stayed bridge ranging from 100 m to 500 m in the past, while during this decade the length of cable stayed bridge is increased to m. The purpose of this thesis is to preliminary design three bridge alternatives.
The earliest known surviving example of a true cable stayed bridge in the united states is e. Buy analysis and design of cable stayed bridge book online. There are many other examples of ancient cable stayed bridge systems found around the world. In the design of cablestayed bridges, the construction analysis is very important since the worst stresses are usually reached during the construction process. Simulation of cantilever construction of cablestayed bridges. Windinduced vibration of stay cables transportation. The oldest application of the cable stayed bridge concept was found in the 17th century but the use of this design was prominently seen throughout the 1800s. Center bridge is designed as a compound bridge of suspension bridges and cablestayed bridges with 4000 m superlongspan. In the recent years cable stayed bridges have received more attention than any other bridge mainly, in the united states, japan and europe as well as in thirdworld counties due to their ability to cover large spans. Journal of engineering sciences, assiut university, vol. For a real design of a cable stayed bridge, connection of key segment and generation of side span supports, temporary bents, temporary rigid link between tower and girder and elastic link between tower and girder, which are the factors affecting the structural behavior, should be included.
A reference model is designed and used to investigate the influence of key design parameters on static behavior of a cable stayed bridge. In this paper, a linear elastic 2d and a fully nonlinear 3d finite element model of an idealised steel cable stayed bridge are developed and analysed to determine the effect of sudden loss of cable on the. Analysis of geometrical and mechanical properties of cable. The first bridge was built across the elbe river near podebrady and the second bridge was built over a major railroad junction in praguevrsovice. Introduction the influence of cables and stiffening girder parameters on deformations and strains in the cable stayed bridge system are presented in previous publications 1. Optimum design of a controlled cable stayed bridge subject. Analysis of the behaviour of cable stayed bridge with. This bridge is cablestayed with a posttensioned concrete deck, double towers, and double cable planes. Thus, there are three main objectives for this research, which are the effect of sudden loss of critical cable s, cable loss due to blast loadings and progressive collapse triggered by the earthquake. The bridge concept include a semifan, central suspended span and selfsupported cable stayed system. Lec12 cablestayed 2012 department of civil and systems. Cablestayed bridges are extremely elegant and very effective structures and they are also architectural landmarks.
Finally he dynamic analysis of a cablestayed bridge subjected to moving loads is studied. In this paper, a linear elastic 2d and a fully nonlinear 3d finite element model of an idealised steel cablestayed bridge are developed and analysed to determine the effect of sudden loss of cable on the. Cablestayed bridge structural design of everyday objects. The models of bridge which have been prepared were having side supports. These cables support the beam a cable stayed bridge, one of the most modern bridges, consists of a continuous strong beam girder with one or more pillars or towers in the middle the cables are anchored. The large span and multicable semiharp pattern is representative of the present trend on such structures. Effect of the different shapes of pylons on the dynamic. General data of the bridge according to the given conditions and the accepted concept of precast superstructures the bridge is designed as a cablestayed beam, with two spans 14. Cablestayed bridges have been around for about 40 years ago. Indeed, while a long cable stayed span is under construction, there may be great concern about possible oscillations, until the cantilevers are joined. For a longspan cablestayed bridge, the huge initial stress accumulated in the pylon and the girder will reduce the overall structure stiffness. Automatedhinge properties in sap2000 are computed automatically from the element material. Tutorial included in the sap2000 bridge examples document. Past efforts in determination of dynamic characteristics of structures has facilitated.
There is a need of study on the effect of shape of pylon on the dynamic response of cable stayed bridge, for this, the bridge span dimension and other. Determination of initial cable force of cantilever casting concrete. At about 450 pages and abundantly illustrated with graphics and color photos, this is an authoritative book on design and construction of cablestayed bridges, written by arguably one of the worlds leading bridge engineers. Comparison between three types of cable stayed bridges using structural optimization pdf. Other situations may call for cablestayed bridges, where the deck is not straight in plan but curved. This model is submitted as part of a feasibility study for a cable stayed bridge to. These cables support the beam a cablestayed bridge, one of the most modern bridges, consists of a continuous strong beam girder with one or more pillars or towers in the middle the. Buy analysis and design of cable stayed bridge book online at. Reflections on its construction and stay cable bridge engineering design are provided by. There were no exhaustive studies for the selection of the preliminary design, only reasonable conditions concerning aesthetics and element sizing being accounted for. Design of cable systems for cable suspended bridges.
Cable meshes hybrid structures consisting of bars and cables or trusses and cables suspension bridges single span the main beam can be replaced by a truss multispan may have spans of several kilometres cablestayed bridges harp type fan type hyperbolic paraboloid loadbearing cables tightening cables loadbearing cable hanger. Case studies about the effects of cablestayed bridge length, the design of subcable, height and stiffness of main tower, type of foundation and length of. Reducing the cost of a cable stayed bridge the objective of this paper is to encourage engineers to consider the possibility of using cable stayed bridges for relevant situations. The evolution of these bridge types of was based on the development of cable theory and manufacturing.
By design, all static horizontal forces of the cablestayed bridge are balanced so that the supporting towers do not tend to tilt or slide. When a cablestayed bridge is chosen, the initial design phase is of utmost importance. The example bridge is a longspan cable stayed bridge of a 605 m central span length with steel box girder and reinforced concrete towers under construction in china. Alternatives in the design and construction of cablestayed. The definition of cable stayed bridge deck length used here is. Design and construction of cablestayed bridges in the. Among the most important nonlinear effects to consider in the design of a cable stayed bridge are cables and deck wind vibrations 3, 4, seismic analysis considering soilstructure interaction and multiple base excitations 5, 6, and pushover analysis to determine the resistant capacity 7. Atype, htype, diamond type, inverted ytype, double diamond type and single pylon type on sap 2000 software. At about 450 pages and abundantly illustrated with graphics and color photos, this is an authoritative book on design and construction of cable stayed bridges, written by arguably one of the worlds leading bridge engineers. A big difference between cantilever bridges and cablestayed bridges is that the former usually have a suspended span, and the latter do not. Bridge design requirements during the design of a cablestayed bridge structure, the con cept selected must meet the owners established requirements of aesthetics, operability, economics, maintainability, and functionability. In designing a cable stayed bridge there is first the problem of finding the required quantity of high strength steel for the cables.
509 1241 1248 574 1173 158 1381 1212 160 1384 1116 572 1275 389 413 666 512 1429 1601 1548 650 441 1598 698 641 1320 1085 302 304 1316 989 690 979 679 1149 1104 612 575 56 174