Design of cable stayed bridge pdf

Contractor chosen for south africas longest cablestayed. The successful bidder for the msikaba bridge is a joint venture between south african civil engineering company concor and international construction business motaengil. Cable stayed bridges ice manual of bridge engineering. A cablestayed bridge is a structure with several points in each span between the towers supported upward in a slanting direction with inclined cables and consists of main towers, cablestays, and main girders, as shown in fig. With their inherent rigidity, the use of cad for designing, and improvements in the quality of building materials, we can definitely expect to see more of these amazing bridges built in. A finite element fe model for a cable stayed bridge. Cable stayed bridges were highly statically indeterminate structures and in order to find out exact solution of these highly indeterminate systems and analyse the cable stayed bridge the electronic computers played a very vital role. Pdf cablestayed bridges for urban spaces researchgate. A big difference between cantilever bridges and cablestayed bridges is that the former usually have a suspended span, and the latter do not. Prior to the 1950s, steel cables were used primarily for longspan bridge structures, not buildings. They have recently proved to be highly costeffective for short to medium spans. Jyoti prasad professor department of civil engineering, college of technology submitted by.

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. However, the cablestayed bridge concept offers more and can adapt to very special boundary conditionsthe outcome may be e. The key element for both suspension bridge and a cablestayed bridge is the cable. Also an example of a cable stayed bridge is presented in chapter 2. The posttensioning institutes pti recommendations for stay cable design, testing and installation provide explicit design guidance for abrupt cable loss as. Unlike the natural eigenvalue modes, load dependent ritz vectors produce more reliable results in dynamic analyses with relatively fewer modes. It is a very efficient means of achieving a long span and aesthetically pleasing. Design considerations in cablestayedroof structures. Concept and design, third edition, has been significantly updated with new material and brand new imagery throughout. A simple model of the bridge, comprising beam elements for the longitudinal deck girder and lower and truss elements for stay cables, is used.

Design criteria of underdeck cablestayed composite. Guidelines for the design of cable stayed bridges discusses loadings and materials used in the design of cable stayed bridges. Design criteria of underdeck cablestayed composite bridges. Pdf optimum design of cablestayed bridges researchgate.

When a cablestayed bridge is chosen, the initial design phase is of utmost importance. Virtually unknown 40 years ago, these bridges have become increasingly important as their properties have been more fully understood. The main structural elements of a cable stayed bridges are the bridge deck, piers, towers and the stays. Prepared by the committee on cable stayed bridges of asce. Design of cable systems for cable suspended bridges. The cables are in tension, and the deck is in compression.

The project was part of the bc governments ambitious program to upgrade the transportation network in the vancouver region in order to further the. One goal was to create a design that minimized the bending stresses in the 5 6 7 26. Alternatives in the design and construction of cablestayed. The practice of supporting bridges by cable stays has found renewed favor during the past decade. Henderson office of infrastructure research and development notice. 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. Design considerations in cable stayed roof structures cable supported roof structures have inspired and fascinated people for many years. The bridge concept include a semifan, central suspended span and selfsupported cablestayed system. Novemberdecember 1993 cablestayed structure by obtaining the minimum depth of the deck that also. Dynamic analysis in the form of time history analysis and aerostatic effect has been considered. The database covers bridge lengths ranging from 250 m to 700 m. Alternatives in the design and construction of cable. Design and construction of cablestayed bridges in the czech.

Long span timber bridges in the frame of the nordic timber bridge project. Cablestayed bridge analysis using staad pro v8i youtube. Another type of suspension bridge is a cablestayed design. List of longest cablestayed bridge spans wikipedia. In us practice, cable stayed bridges are the only long span bridge form routinely designed for member cable loss. Engineers constructed the first cable stayed bridges in europe following the close of world war ii, but the basic design dates back to the 16th century and croatian inventor faust vrancic. An example of this latter arrangement can be seen with the design of the ting kau bridge, hong kong, which is a fourspan cablestayed bridge. The definition of cable stayed bridge deck length used here is. The definition of cablestayed bridge deck length used here is.

Other situations may call for cablestayed bridges, where the deck is not straight in plan but curved. A contractor has now been appointed to build south africas longest cablestayed bridge, following a restart of the bidding process. An extensive parametric study is then conducted using this optimization code to develop a database for the optimum design of semifan cablestayed bridges. Both bridges are suspended in the bridge axis on composite steel pylons that are fixed into the deck see fig. A continuous part of the bridge deck that is supported only by staycables and pylons, or are free spans. In comparison with the continuous girder bridges, the internal forces due to both dead load and live load are much smaller in cablestayed bridges.

Guidelines for the design of cablestayed bridges discusses loadings and materials used in the design of cablestayed bridges. Also an example of a cablestayed bridge is presented in chapter 2. In the harp design, the cables are nearly parallel. Cable stayed bridges date back to 1595, where designs were found in machinae novae, a book by croatianvenetian inventor fausto veranzio. This thesis will examine the main issues regarding cables. The solution for an optimum distribution of posttensioning cable forces is considered one of the most important and difficult tasks in the design of cable stayed bridges. The deck supports the loads and transfers them to the stays and to the piers through bending and compression. Cable stayed bridgemodelling, design, and analysis the cable bridge using staad pro v8i. However, the design of slender bridges may be governed by the vibrations under traffic live loads. This is done by attaching them to various points on the towers. The cable stayed bridge is an elegant, economical and efficient structure. The combination of multiple simple systems allows for a structure where the role of each of its components is well defined. The various response quantities bending moment,sf,afwith varying pylon shape and configuration with varying central span has been compared.

Prepared by the committee on cablestayed bridges of asce. The evolution of these bridge types of was based on the development of cable theory and manufacturing. Design considerations in cablestayed roof structures cablesupported roof structures have inspired and fascinated people for many years. Action forces for equivalent systems action forces of actual systems bridge dynamics protection of bridges against ship collision preliminary design c. Stay cables of a cable stayed bridge are posttensioned to counteract the effect of the bridge dead load. Lec12 cablestayed 2012 department of civil and systems. 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. The solution for an optimum distribution of posttensioning cable forces is.

The disadvantage of such an auxiliary cable system is that the individual cables are very long and the large sag will be visually dominant when compared with the adjacent stay cable plane. An example of this latter arrangement can be seen with the design of the ting kau bridge, hong kong, which is a fourspan cable stayed bridge. However, cables systems still represent a relatively new form of roof construction. The cablestayed bridge is related to the cantilever bridge. A cable stayed bridge is one where the bridge deck is stayed by cables attached to towers. Practical experience in the design of anchorages for cable.

Optimization of cablestayed bridges with boxgirder decks core. The spans can be constructed as cantilevers until they are joined at the centre. 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. Cablestayed bridge simple english wikipedia, the free. Lifecycle cost design basis for the new port mann cablestayed bridge introduction the port mann bridge highway 1 project was tendered in 2007 as part of the gateway development in vancouver, bc. The nonlinear effects of cables are generally less dramatic in cablestayed structures than in cablesuspended structures. Introduction cables stretch diagonally between these pillars or towers and the beam. The deck is made of three spans, the central one of 150 m and two lateral ones of 75 m each. Underdeck cable stayed bridges are innovative bridge schemes that can lead to lightweight and highly efficient construction. A contemporary of astronomers tycho brache and johannes kepler, vrancic produced the first known sketch of a cable stayed bridge in his book machinae novae. Owing to their excellent structural characteristics, aesthetic appearance, low maintenance cost, and efficient use of structural materials, cablestayed bridges have gained much popularity in recent decades. Action forces for equivalent systems action forces of actual systems bridge dynamics protection of.

This report presents a result of the work in the part project. Guidelines for the design of cablestayed bridges books. The span of steel cable stayed bridges has now exceeded m, with the sutong bridge spanning the yangtze river in china with a main span of 1088 m, being the longest. 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. These cranes come in a wide variety of sizes to meet the need for a particular height and reach. Jul 19, 20 summary this chapter contains sections titled. Guidelines for the design of cablestayed bridges asce library. Design and analysis of a slanted cablestayed building. T wo cable stayed bridges using precast, prestressed concrete segmental.

Seminar report on cable suspension bridge to be submitted in partial fulfilment of the requirement for the degree of bachelor of technology in civil engineering under the guidance of dr. Lin international san francisco, california for 22 years, jiri strasky worked as chief design engineer with dopravni stavby, olomouca leading state company for the construction of bridges in czechoslovakia. Keywords cable stayed bridges, high strength steel, orthotropic type decks, suspension bridge. Design and construction of cablestayed bridges in the. The development of high strength steel cables and the advancement of analytical theories for statically indeterminate structures have overcome the problems associated with these early failures and have made the cablestayed system a viable alternative for bridge design.

A cablestayed bridge is a bridge that has one or more columns called towers or pylons, with cables directly supporting the bridge deck there are two main types of cablestayed bridges. These guidelines are intended to be used as performance specifications to be used with any national code. The study of the building was divided in to a geometrical study and a cable study. In the longitudinal direction, the bridge is symmetric with respect to the midspan, and it include two towers and two set of cables. The cable stayed bridge design system, with all its variation, is a costeffective and more aesthetically appealing means of spanning medium to long distances. Fourteen years on from its last edition, cable supported bridges. A cablestayed bridge has one or more towers or pylons, from which cables support the bridge deck. Design considerations in cablestayed roof structures.

Suspended and cable stayed bridges are slender structures susceptible to vibrations caused by wind and traffic. The ritz vectors are generated reflecting the spatial distribution or the characteristics of the dynamic loading. Aug 05, 2014 cable stayed bridge modelling, design, and analysis the cable bridge using staad pro v8i. The height of attachment of each cable on the tower is similar to the distance from the. 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 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. Design and construction of cablestayed bridges in the czech republic. Cablestayed bridges are large and sophisticated struc tures which may greatly benefit from the use of structural optimization techniques for preliminary design. Cable stayed bridges are extremely elegant and very effective structures and they are also architectural landmarks. Underdeck cablestayed bridges are innovative bridge schemes that can lead to lightweight and highly efficient construction. Cable stayed bridges an overview sciencedirect topics. The cablestayed bridge design system, with all its variation, is a costeffective and more aesthetically appealing means of spanning medium to long distances.

A methodology for preliminary design of cablestayed bridges using optimization techniques is presented. Cablestayed bridges are extremely elegant and very effective structures and they are also architectural landmarks. Pdf design concepts and case studies for cable stayed bridges, in which aesthetics and environmental conditions required particular consideration. To confirm the validity of the design, a static and dynamic analysis of the structural system was conducted together with model testing. Mainly the cable stayed bridge type has been investigated. Abstract in many cases, bridge designers concern themselves only with checking the stability and member stress levels in the structure for. The key element for both suspension bridge and a cable stayed bridge is the cable. It describes the variations of the optimum design parameters, such as the main span length. When a cable stayed bridge is chosen, the initial design phase is of utmost importance. The purpose of this thesis is to preliminary design three bridge alternatives. Two types of cable nonlinearities exist, geometric nonlinearities and material nonlinearities.

Analysis of the performance of cablestayed bridges under. Windinduced vibration of stay cables transportation. This is in contrast to the modern suspension bridge, where the cables supporting the deck are suspended vertically from the main cable. Bridge design requires experienced personnel knowledgeable in stateoftheart techniques and methodol ogies. The discussion is focused more on practical knowledge rather than on theoretical calculations. A distinctive feature are the cables or stays, which run directly from the tower to the deck, normally forming a fanlike pattern or a series of parallel lines. 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 nonlinear effects of cables are generally less dramatic in cable stayed structures than in cable suspended structures. A systematic approach is discussed for the preliminary design of cable stayed bridge which will fix the. Like all bridge designs of this epoch, it exhibits many departures from what. Many early suspension bridges were cable stayed construction, including the 1817 footbridge dryburgh abbey bridge, james dredges patented victoria bridge, bath 1836, and the later albert bridge 1872 and brooklyn bridge 1883. Seismic design of longspan cablestayed bridges has received a strong input in the latest decades, from both conceptual design and construction point of view.