CABLE STAY BRIDGE DESIGN

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    A PROJECT REPORT

    PARAMETRIC STUDY OFCABLE STAYED BRIDGE

    SUBMITTED BY

    KOYANI UMANG A. (140540720009)

    I n ful fi lment for the award of the degree

    Of

    MASTERS OF STURUCTURAL ENGINEERING 

    I N  

    CIVIL ENGINEERING

    2015-2016

    DEPARTMENT OF CIVIL ENGINEERING

    DARSHAN INSTITUTE OF ENGGINEERING AND TECHNOLOGY,RAJKOT.

    GUJARAT TECHNOLOGICAL UNIVERSITY- AHMEDABAD

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    CERTIFICATE

    This is to certify that preliminary draft report entitled Submitted by

    “PARAMETRIC STUDY OF CABLE STAYED BRIDGE” 

    1. 

    140540720009  KOYANI UMANG A.

    In partial fulfilment for the award of the Master Degree in Structural engineering of the Gujarat Technological

    University-Ahmedabad is a record of their own work carried out under our supervision and guidance.

    DATE:

    Co Guide: Head of Department:

    Prof. K.C.KORADIA 

    Civil Engineering Dept.

    DIET-RAJKOT.

    Prof.. M. D. BARASARA

    Civil Engg. Dept.

    Darshan Institute of Engg. & Tech.

    DIET-RAJKOT

    (Principal)

    Darshan institute of Engineering and Technology.

    Seal Of Institute

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    EXAMINER’S CERTIFICATE OF APPROVAL 

    This is to certify that draft report entitled submitted by

    “PARAMETRIC STUDY OF CABLE STAYED BRIDGE ” 

    1. 140540720009  KOYANI UMANG A.

    In partial fulfilment for the award of the Master Degree in “Structural Engineering” of the

    Gujarat Technological University- Ahmedabad is hereby approved.

    Examiners:

    1.____________________________________

    2.____________________________________

    3.____________________________________

    2015-2016

    DEPARTMENT OF CIVIL ENGINEERING

    DARSHAN INSTITUTE OF ENGGINEERING AND TECHNOLOGY

    RAJKOT-MORBI HIGHWAY, RAJKOT, GUJARAT

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    PREFACE 

    It gives us great pleasure in placing this teamwork report, in the hands of our esteemed faculties; we

     believe that, it will go through the documentation of the study work done by our team. The objective

    of this report is to provide both a conceptual understanding of the system as well as working guide.

    As the students of ME (Structure) when we acquire all the theoretical knowledge, it is both necessary

    and advisable to acquaint the students with the real situation through, well-planned study in relevant

    fields. Using all the theoretical knowledge and applying into the real application the student learns to

    develop efficient real world application at the time of project training. So, the project training is very

    important for the student for self-development and self-confident. Also student learns organizational

    structure, rules and regulations and management in a real sense, which helps student to get discipline

    in life.

    Aimed for providing the reader with easier and in-depth knowledge of all the basic as well as

    important aspects related to the systems having the functionality's of their respective fields in form of

    report. The report contains the literature of almost all the things, which we have gone through from

    the point of view of any system development life cycle.

    I did a project on “PARAMETRIC STUDY OF CABLE STAYED BRIDGE” for optimization of

    cable cross section of BANDRA WORLI SEA LINK MUMBAI. An effort has been made to

    exhaustively deal with every part of designing and analysis cable stayed bridge and they are

    compared with real life problem which stand alone as tall in the Mumbai named as BANDRA

    WORLI SEA LINK.

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    ACKNOWLEDGEMENT

     No work is possible without blessings of god, first of all we would like

    to heartily thanks to god, who gave a moment in our life to write the acknowledgement letter for our

     bachelor degree.

    Our sincere thank goes to MIDAS TEAM for their valuable guidance and supporting us during the

    entire project work for MIDAS CIVIL software related knowledge.

    We are also thankful to MIDAS TEAM for their warm cooperation and also for their support in

    completing the project..

    We would like to express our most sincere gratitude to our academic advisor

    Prof. K.C.KORADIA, Lecturer Civil Engineering Department, DIET and

    Prof. M.D. Barasara  – Head Civil Engg. Department, for their extremely important encouragement

    given to us to get our project work up to this point.

    We would also like to thank Civil Engineering Department-Darshan Institute of Engg. and Technology

    -Rajkot for their valuable support in our project.

    Finally and most importantly, we record our permanent gratitude for the faith and support of the people

    with whom we really worked and lived – our parents and our family.

    DIET, Rajkot.

    Koyani Umang A. (140540720009)

    (i)

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    ABSTRACT

    Construction work in India is one of the most widespread activities, involving a range of people from

    the small builder in villages and towns to large private companies, public undertakings and various

    state agencies.

    At present civil engineering has suffered from a drastic evolvement over last decades there has been

    a large amount of improvement in civil works management done by many leading company by

    hiring structural engineers as a result there is a many structure design and analysis related software’s

    are also used by structure engineers, which simplify the design problems and gives the idea about

    actual structure how looks and works.

    The construction industry requires high degree management of men & material to complete the

     project successfully at an optimum cost. Hence a special branch of structural engineering has been

    developed to accommodate the designs and analysis of structures which are adopted to improve the

     performance of various aspects of an engineering project and optimize the cost.

    Government has Expertise in providing modern infrastructure to public and also dealing with

    numbers of big projects to secure a good position of India in Global Developed Market in

    Infrastructure.

    The projects focus on parametric study of cable stayed bridge. Different parameters like side span,

     pylon shape, cable stay arrangements etc. affects on the bridge designing specially. Using the

    different software’s available in the market for bridge designing it is possible. We were been going

    to use MIDAS CIVIL software for our designing and analysis purpose.

    (ii)

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    LIST OF FIGURES

    FIG. 1 Bandra Worli Sea Link

    FIG. 2 Connection of Deck & Pylon

    FIG. 3 Bending Moments At Last Construction Stage As Per Software TechnicalManual 

    FIG. 4 Bending moments as per MIDAS civil analysis

    LIST OF TABLES 

    TABLE 1 Max. Acceleration In longitudinal Direction

    TABLE 2 Tower Displacement In Lateral DirectionTABLE 3 Max. Moment In lateral Direction

    TABLE 4 Loads

    TABLE 5 Material property

    TABLE 6 Loading Data

    TABLE 7 Material data of the example model

    TABLE 8 Section data of the example model

    TABLE 9 Loading data of the example model

    (iii)

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    TABLE OF CONTENTS

    Acknowledgment.......................................................................................................................... i 

    Abstract........................................................................................................................................  ii

    List Of Figures................................................................................................................................iii

    List Of Tables.................................................................................................................................iii

    CONTENTS 

    CHAPTER 1

    1.1 INTRODUCTION ……………………………………………………....………..…..…..………..... 1

    1.2 STUDY AREA………………….............................................…………....................... 3

    CHAPTER 2

    2.1

    2.2

    LITERATURE REVIEW……………………………………………………………………….……...... 

    REFFERED JOURNALS……………………………………………………………………….……......

    5

    6

    CHAPTER 3

    3.1 OBJECTIVES OF PROJECT………………..…………………………..………… .…………….... 

    3.2 NEED OF STUDY…………………………………………………………………………………………. 

    12

    13

    CHAPTER 4

    4.1 WORK PLAN....................................................................................................

    4.2 DATA COLLECTION………………………………………………………………………….…..…….. 

    4.3 TOOLS AND TACKELS……………………..………………………………………………………….. 

    4.4. PROGRAM VALIDATION…………………………………………………………………………….. 

    CHAPTER 5

    5.1 EXPECTED PROJECT OUTCOME....................................................................... 

    CHAPTER 6

    6.1 FUTURE SCHEDULE.......................................................................................... 

    REFERENCES…………………………………………………………………….……………………………..….

    14

    15

    16

    17

    20

    21

    23

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    CHAPTER - 1 

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    1.1 INTRODUCTION

    All the Three human basic needs: shelter, food and clothing call for civil engineering construction

    works and their subsequent maintenanace.Ordinarily construction activity accounts for 15% of all the

     jobs. The construction industry requires high degree management of men & material to complete the project successfully at an optimum cost. Hence a special branch of building construction has been

    developed to accommodate the techniques which are adopted to improve the performance of various

    aspects of an engineering project.

    The branch of structural engineering aims to design and analyse the structure as per the requirement

    of site conditions. This branch is of immense importance because if design is wrong or if any factors

    which will affect the structure would be not considered then it will be cost to the whole project.

    At present construction work in India is one of the most widespread activities, involving a range of

     people from the small builder in villages and towns to large private companies , public undertakings

    and various state agencies.

     Now a days structure designing becomes prime requirement for that purpose many software’s are

    available i.e. MIDAS,STADD,ETAB etc.

    The construction industry is a major economic activity in India. Construction activities contribute

    annually about 10% to the Gross National Product (GDP), Thus Playing a major Role in the

    development of the national economy.

    The need for professionalism in designing and analysis of structure assumes special significance in

    order to ensure that the huge resources invested in the construction industry are deployed efficiently

    for the benefit of society and structure operates efficiently.

    PAGE 1

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      What is a Bridge? 

    •  “A bridge is a structure built to span physical obstacles such as a body of

    water, valley, or road, for the purpose of providing passage over the obstacle.” 

    •  There are many different designs that all serve unique purposes and apply to different

    situations.

    • 

    Designs of bridges vary depending on the function of the bridge, the nature of

    the terrain where the bridge is constructed and anchored, the material used to make it,

    and the funds available to build it.

      Type Of Bridges

    •  Bridges can be categorized in several different ways. Common categories include the

    type of structural elements used, by what they carry, whether they are fixed or

    movable, and by the materials used.

     

    Based On Structure Type 

    • 

    Beam Bridge

    •  Truss Bridge

    •  Cantilever Bridge

    •  Arch Bridge

    •  Tied Arch ridge

    • 

    Suspension Bridge

    •  Cable-Stayed Bridge

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    1.2 STUDY AREA

      The projects focus on Parametric study of Cable Stayed Bridge Bridge by taking real life

    example Worli Sea Link Cable Stayed Bridge.

     

    Why Bridge Is Required ? 

      In city like Mumbai where trains also travels full of the people then no concern to talk about

    traffic problem.

      In Mumbai to travel from Bandra To Worli it takes 60-90 minutes.

      To reduce this travel time one of the alternative is to construct the over bridge but due to

    nearby two airports in the Bandra there is a no option to construct over bridge so that

    government carried out steps to construct the bridge through the sea to connect Bandra and

    Worli.

     

    Bandra Worli Sea Link reduces the road length and hence time travel between Bandra andWorli.

    PAGE 3

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    Fig. 1 Bandra Worli Sea Link

      Features:

      Carries : 8 lanes of traffic with 2 lanes for buses.

      Locale : Mumbai, Maharashtra, India

      Total length : 5.6 kilometres (3.8 kms over the Sea)

     Width : 2 x 20 metres

      Height : 128 metres

      span : 50 + 150 + 50 metres

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    CHAPTER - 2 

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    2.1 LITERATURE REVIEW

      For the Cable stayed bridge researchers analyzed different parameters which would designer

    have to keep in mind:

    1) Bridge Deck Property

    2) Pylon Shape During EQ(A, H, Portal Frame, Spread Pylon & Pyramid Shapes)

      The Pylon Shape Has great influence in the mitigation of SSI effects the result showed that in

    comparison to rotational A or H shape of pylon diamond shape of pylon is giving less

    response. Hence if it is used practically will be proved less economical.

      The Inverted Y design of the pylon is a solution that uses the tensioning mechanism and it

     provides compromise between deck sizing and costly strengthening methods.

    3) C/S of Cable

    4) Cable Layout Pattern

      The deflection of deck is slightly depend on the layout of cable system either Harp or Fan

    system.

      The B.M. in the deck using the fan system are higher than that in harp system.

      So for Large-span Bridges Fan system is appears to be less suitable.

    5) Pylon Height to Span Ratio

      Deflection of the deck significantly decrease as the pylon height to span ratio H/L increases.

    6) Exposure Conditions

    7) Foundation Condition

    PAGE 5

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    2.2 REFFERED JOURNALS

    ((1)) International journal of civil and structural engineering Vol. 1, No. 3,2010

    Aim : Effect of pylon shape on seismic response of cable stayed bridge with soil structure

    interaction

    Author : Siddharth G Shah, Desai J. A. , Solanki C.H.

    Abstract : Bridge is designed as per below data only the pylon shape is varied viz. A type,h type,

    spread pylon and pyramid shapes.

      The height of pylon is kept constant for all the shapes for comparison purpose.

      3D bridge model is analyzed for SSI through soil spring provide at base by taking Bhuj 2001

    time history data.

      The bridge response in terms of Pylon Displacement, Pylon Acceleration and Pylon Base

    moment is obtained.

      Different Properties including lateral and rocking stiffness coefficients for three

    types of soil Hard,Medium & Soft Soil is considered.

    Conclusion: The analysis is carried out for Four different shapes of pylons on SAP2000 software by

    time history method.

      The results showed that,

    Table 1 Max. Acceleration in Longitudinal Direction

    H pylon A Pylon Y Pylon Pyramid Pylon

    SOFT SOIL B 

    MEDIUM SOIL A  B C  D 

    HARD SOIL A  A  B  B 

    PAGE 6

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    Table 2 Tower Displacement in Lateral Direction

    H pylon A Pylon Y Pylon Pyramid Pylon

    SOFT SOIL C 

    MEDIUM SOIL

    C A 

    B D 

    HARD SOIL C B  A  D

    Table 3 Max. Moment in lateral Direction

    H pylon A Pylon Y Pylon Pyramid Pylon

    SOFT SOIL

    MEDIUM SOIL A  D  C  B 

    HARD SOIL A 

    PAGE 7

      A,B,C,D is in Descending order shows

     

    The pylon shape has great influence in mitigation of SSI effects the result showed thatin comparison to rational A or H shape of Pylon Diamond shape of pylon is givingless response. Hence if it is used practically will be proved economical.  

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    ((2)) Proceedings of bridge engineering 2nd  conference April 2009

    Aim : A critical Analysis of Bandra-worli Cable stayed bridge, Mumbai 

    Author : C.S.W.DAVIS 

    Abstract :The span of main cable stayed bridge 600m , consisting of two 250m cable supported

    spans and two 50m conventional approach spans.

    1)FOUNDATION

      The drilled shaft method of construction was used to for the shafts.

      The shafts vary considerably in size, depending on the bedrock “Rock encountered at the site

    included highly weathered, fractured and oxidized volcanic material with RQD’s of less than

    25 percent and unconfined compressive strengths of 1 MPa”. 

      Foundations for the towers comprised of 52 2m diameter piles arranged in a H shape to

    capably support the legs of the pylon, they are up to 34m in length.

    2)PYLONS

     

    The main span bridge has 2 pylons, each with 4 legs, each tower is inclined towards the other by 10°, eventually merging at 98m above deck to become a single tower.

    3)CABLE 

      In total there are 264 cables attached to the towers, they form a semi-fan arrangement.

    Cable spacing is 6.0 meters along the bridge deck.

    4) DECK

      The deck of the Bandra Worli Sea Link consists of a hollow concrete box section with 3

    cores, the dimensions of the deck varies throughout the length of the bridge.

      The pre-cast segments vary in length from 1.5m to 3.1m. Each section of bridge deck will be

     post tensioned following installation.

    5) LOADING Table 4 Loads

    LOADS  FACTORS  VALUE 

    Dead 1.05 177.9kN/m

    Super-imposed load 1.75 178.5 KN/m

    HA 1.5 13.5 KN/m

    HB 1.3 45 units, nominally

    146.3 KN per wheel

    Conclusion:

      The optimized execution of the inverted Y design of the pylon is a solution that is both

    aesthetically and technically successful.

      The use of tensioning mechanisms has provided an efficient compromise between deck sizing

    and costly strengthening methods.

    PAGE 8

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    ((3)) Tail or M ade Concrete Structures jour nal –  Walraven & Stoelhorst (eds)  Vol. 2, Issue 2

    (Apr.-June 2015)

    Aim : Behavior of a multiple spans cable-stayed bridge 

    Author : S. Arnaud, N. Matsunaga, S. Nagano & J.-P. Ragaru 

    Abstract : We got the opportunity to participate in the design check of a five towers cable-stayed

     bridge with 300 meters spans and we examined the configuration between type of

    connection, stiffness of deck, stiffness of piers and pylons, in order to confirm the

    minimal structural cost.

      One of the main problems of bridges with multiple cable-stayed spans is the behavior under

    live loads,as the deflections and bending moments in the deck are more influenced by the

    stiffness of the pylons and by the connection between deck and pylon than for a standard

    cable-stayed bridge.

      The second problem is the effect of deck length variation due to temperature and concrete

    creep and shrinkage.

      further calculations about the relationship between stiffness of deck, pylons and piers.

      Results are presented with particular focus about the impacts of asymmetric loading and

    thermal expansion of the deck on this multiple spans structure.

    Fig 2 Connection of Deck & Pylon

    Conclusion :The main conclusions of this study about behavior of multiple cable-stayed spans

     bridges under live Loads and thermal variation are:

      The connection type c (tower and deck sliding on pier) is the more effective and economic for

    the studied load cases.

      For the connection type c, it is efficient to reduce the deck rigidity and to increase the pylon

    rigidity.

      The connection type b (deck embedded in the pylon) can be more efficient, but we shall

    solve the problem of the extension under long time variations.

      The type a and d structures (deck simply supported on pylon or fully suspended) are less

    efficient under live loads and thermal variation, with more forces on the foundations and

    more force in the deck.

    PAGE 9

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    ((4)) IJRTE,ISSN: 2277-3878, Volume-4 Issue-4, September 2015 

    Aim : Analytical Investigation of Cable Stayed Bridge Using Various Parameters

    Author : Parag R. Nadkarni, Padmakar J. Salunke, Trupti Narkhede

    Abstract : In this paper, analysis of 240 m long fan type cable stayed bridge having single planeof cables is carried out with the help of software facilities.

      Effects of various parameters such as stiffness of deck and pylon and number of cables on the

     behavior of cable stayed bridge were observed.

       Number of models of cable-stayed bridge generated in software SAP-2000.

      From the analysis of number of models, The effect of parameters is studied through

    comparison of bending moments at following critical locations.

    1) Sagging moment at mid span of central panel of deck

    2) Hogging moment in deck at pylon location

    3) Moment in Pylon at deck level

    Conclusion : various effects on maximum moments in deck at mid span of central panel and at

     pylon location and maximum moment in pylon at deck level were observed in governing load

    combinations which are as follows.

    Increase

    Height Of

    Pylon 

    Increasing

    Depth Of Box

    Girder Deck  

    Increase In

    Pylon Cross

    Sectional

    Properties 

    Increasing

    Number Of

    Cables 

    Moment In Pylon  DECREASES DECREASES INCREASE DECREASES

    Sagging Moment In

    Deck  

    DECREASES - - DECREASES

    Hogging Moment In

    Deck  

    INCREASE - - INCREASE

    Moment In Box Girder

    Deck  

    - INCREASE - -

      From all these observations, it is seen that stiffer sections of deck and pylon will produce

    more bending moments in the corresponding bending moments.

      It is preferable that slender sections should be used for deck and pylon so as to achieve

    economical solution. Further, use of more number of cables reduces bending moments in

    overall structure.

    PAGE 10

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    ((5)) The IUP Journal Of Structural Engineering (Vol.VII ,No. 3 ,July 2014) 

      Aim : The effect of side span length on the behavior of long-span hybrid Cable-stayed

    suspension bridge

      Author : Ghanshyam Savaliya, Atul K Desai, Sandeep A Vasanwala

      Conclusion: From the analysis carried out on hybrid cable-stayed suspension bridge, the

    following

    Observations are made:

    1)With decrease in length of side span from 490m to 210m,the axial force in deck at side span

    is reduced to 76.58%.

    2)With increase in length of side span from 210m to 490m,the axial force in deck at center of

    main span is reduced to 76.51%.

    3)With decrease in length of side span from 490m to 210m,the axial force in main catenary

    cable in side span is reduced to 57.34%.

    4)The time period of the deck in lateral bending in 1st and 2nd modes is reduced to 97.90% and

    95.50%,respectively,from side span length 490m to 210m.

    5)The time period of the deck in vertical bending in 1st mode is reduced to 97.55 from side span

    length 490m to 210m.

    PAGE 11

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    CHAPTER - 3 

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    3.1 OBJECTIVES OF PROJECT

      Find Out The Optimum Design Of Cable Stayed Bridge By Multiple Trial Method.

    DIRECT IMPACT OF PROJECT :

      Savings in vehicle operating cost due to reduction in rush in the existing roads and lower

    vehicle operating cost on the bridge.

      Considerable savings in travel time due to increased speed and reduced delays at intersections

    at existing roads. The sea-link reduces travel time between Bandra and Worli during peak

    hours from 60 – 90 minutes to 20 – 30 minutes.

      Ease in driving with reduced mental tension and overall improvement in the quality of life.

      Improvement in environment especially in terms of reduction in carbon monoxide, oxides of

    nitrogen and reduction in noise pollution in areas of Mahim, Dadar, Prabhadevi and Worli.

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    3.2 NEED OF STUDY

      Savings in vehicle operating cost due to reduction in rush in the existing roads and lower

    vehicle operating cost on the bridge.

      Considerable savings in travel time due to increased speed and reduced delays at intersections

    at existing roads. The sea-link reduces travel time between Bandra and Worli during peak hours

    from 60 – 90 minutes to 20 – 30 minutes.

      Ease in driving with reduced mental tension and overall improvement in the quality of life.

      MAIN COMPONENTS OF BRIDGE 

    PAGE 13

    Pylon Tower 

    Stay Cables 

    Piers 

    Foundation 

    Road Way 

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    CHAPTER - 4 

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    4.1 WORK PLAN

      Using MIDAS CIVIL software design and analysis of cable stayed bridge

    And compare different parameters as below :

    1) 

    Cable System  Fan System

      Harp System

    2) 

    Cable Stay Angel

      For Both cable system cable angle between 45°, 50°, 60°.

    3) 

    Tower shape

      H Type

      Inverted Y Type

    4) Ratio Of Side Span/Main Span

      Span Property : L = 50 +150 + 50 m =250 m 

      Height : H = 55 m

      Material Property : 

    Table 5

    Concrete Grade M60

    Rebar Strength Fe500

    Cable  =1860

      Loading Data :

    Table 6

    DL

    Self Weight

    Surface Finish

    Service Loads

    LL HA & HB

    WIND

    EQ

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    PAGE 15

       C   A   B   L   E

       S   Y   S

       T   E   M

     

       A   N   G

       L   E

       O   F   C   A   B

       L   E

       S   T   A

       Y 

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    4.2 DATA COLLECTION

    1)  PYLON HEIGHT 

      Pylons were 128m(420 ft) high. 

    2) 

    PYLON SHAPE

      Inverse Y Shape of pylons were used in the bridge. 

      The Main span bridge has 2 pylons, each with 4 legs. Each tower is inclined towards the

    other by 10’,evaentually merging at 98 m above the deck to become a single tower  

      Beneath the superstructure of the Bridge the 4 legs merge to the to 2 points which are carried

    into the ground through the pile caps. 

    3)  CABLE ARRANGEMENTS

      The arrangements of the cable is 4 Planes of Semi Fan Arrangement.  

     

    Cable stay system comprises high strength galvanized steel wires   Each deck section has 2 planes of inclined cables which are attached to the tower in one

     plane. 

    4)  CABLE SPACING

      Cable spacing is 6 m along the bridge deck. 

    5)  DECK

      Deck of bridge consists of a hollow concrete box section with three cores, the dimensions of

    the deck varies throughout the length of the bridge.

      The Pre-cast segments vary in length from 1.5m to 3.1 m

     

    The idea behind the very light weight and slender deck is to reduce the Longitudinal stiffness.

    6)  FOUNDATION

      The drilled shaft method is used for the construction of shafts.  

      The shafts vary considerably in size, depending on the bedrock “rock encountered at site

    includes Highly Weathered, Fractured and Oxidized Volcanic Material . 

      Foundations for the towers comprised of 52 nos. 2m diameter piles arranged in a H Shape to

    capably support the legs of pylon, they are up to 34m in length.. 

    7) 

    CONSTRUCTION METHODS

      The pre cast concrete sections of the deck were launched incrementally between the pillars

    using a truss system, Known as the balanced cantilever Method. 

      The span by span method was used for the construction of the approach sections of the

     bridge. 

    8)  LOADING

      Dead Load

      Super-Imposed Dead Load

      Live Traffic Loading

     

    Combination Loading  Wind Loading

      Seismic Loading

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    4.3 TOOLS AND TACKLES

      SOFTWARE USED :-

      MIDAS CIVIL which is state of the art engineering software that set a new standard for the

    design of bridges and civil structures.

      It features a distinctively user friendly interface and optimal design solution functions that

    can account for construction stages and time dependent properties.

      Its highly developed modeling and analysis functions enable engineers to overcome common

    challenges and inefficiencies of finite element analysis.

      With Midas Civil, you will be able to create high quality Bridge designs with unprecedented

    levels of efficiency and accuracy.

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    PAGE 18 

       S   t  a  y   C  a   b   l  e  s

       P   Y   L

       O   N

       B   R   I   D   G

       E   M   O   D   E   L

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    4.4 PROGRAM VALIDATION

      For an asymmetrical cable-stayed bridge as shown in Figure , we will find pretension loads

    for each construction stage by using the Unknown Load Factors feature, reflecting Forward

    Construction Stage Analysis.

    Fig 2. Configuration at the final stage of an asymmetrical cable-stayed bridge

    Table 7. Material data of the example model

    Classification Modulus of Elasticity Poisson’s Ratio 

    Deck 3.0000e+006 0.3

    Pylon 3.0000e+006 0.3

    Cable 1.5750e+007 0.3

    Table 8. Section data of the example model

    Classification  Cross-sectional Area Moment of Inertia 

    Deck 4.3800 0.92

    Pylon 1.0000 2.7600

    Cable 0.0062 -

    Cable 0.0208 -

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    Table 9. Loading data of the example model

    Classification Load Type Load Value 

    Dead load Self weight

    Cable pretension load Pretension Loads 1 tonf

    Derick Crane Nodal Loads 80 tonf

    Segment Nodal loads Gravity load: A x ϒx L

    Superimposed (2nd) dead

    load

    Element Beam Loads 1 tonf/m

    Support movement Specified

    displacement

    1 mm

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    Fig.3 Bending Moments At Last Construction Stage As Per Software Technical Manual

    Fig.4 Bending moments as per MIDAS civil analysis 

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    CHAPTER - 5 

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    5.1 EXPECTED PROJECT OUTCOME

      Complete exercise is carried out with an intention of optimizing a cable c/s.

      We will Try to find variation in

    (A) Tensile Force in Cables,

    (B) B.M. & Axial Force in pylon

    (C) Variation of stresses in deck element

    By varying below parameter :

    1) Pylon type

    2) Cable system

    3) Cable angle &

    4) Ratio of side span to main span

      Same will be represented in graphical form.

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    CHAPTER - 6 

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    6.1 FUTURE SCHEDULE

    40° Cable

    Inclination 

    Fan

    Type

    Cable

    system

    1 Generation of Deck Jan. 2nd  week

    2 Generation of Pylon COMPLETED 

    3 Generation of Cable Profile COMPLETED 

    4 Generation of Load & Load Combination Jan. 3

    rd

      & 4

    th

     week  

    5 Analysis Feb. 1st  week  

    40° Cable

    Inclination 

    Harp

    Type

    Cable

    system

    1 Generation of Deck Jan. 2nd week

    2 Generation of Pylon COMPLETED 

    3 Generation of Cable Profile Feb. 2nd  week  

    4 Generation of Load & Load Combination Jan. 3rd & 4th  week  

    5 Analysis Feb. .3rd  week  

    45° Cable

    Inclination 

    Fan

    Type

    Cable

    system

    1 Generation of Deck JAN. 2nd  week

    2 Generation of Pylon COMPLETED 

    3 Generation of Cable Profile Feb. 4th  week  

    4 Generation of Load & Load Combination Jan. 3rd  & 4th week  

    5 Analysis March 1st  week  

    45° Cable

    Inclination 

    Harp

    Type

    Cable

    system

    1 Generation of Deck JAN. 2nd  week

    2 Generation of Pylon COMPLETED 

    3 Generation of Cable Profile March 2nd  week  

    4 Generation of Load & Load Combination Jan. 3rd  & 4th week  

    5 Analysis Mar. 3rd  week  

    50° Cable

    Inclination 

    Fan

    Type

    Cable

    system

    1 Generation of Deck Mar.4th  week  

    2 Generation of Pylon COMPLETED 

    3 Generation of Cable Profile Apr. 1st  week

    4 Generation of Load & Load Combination Jan. 3rd  & 4th week  

    5 Analysis Apr. 2nd  week  

    50° Cable

    Inclination 

    Harp

    Type

    Cable

    system

    1 Generation of Deck Apr. 3rd  week  

    2 Generation of Pylon COMPLETED 

    3 Generation of Cable Profile Apr. 4th  week  

    4 Generation of Load & Load Combination Jan. 3rd & 4th week  

    5 Analysis May. 1st  week  

    ANALYSIS OF RESULTS  May 2nd week to May 4th week  

      Modelling and design the Cable stayed Bridge and find out the suitable combination is best

    for the conditions of Worli Sea Link.

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    1)The IUP Journal Of Structural Engineering (Vol.VII ,No. 3 ,July 2014) 

    The effect of side span length on the behavior of long-span hybrid Cable-stayed

    suspension bridge

    2) International journal of civil and structural engineering Vol. 1, No. 3,2010 

    Effect of pylon shape on seismic response of cable stayed bridge with soil structure

    interaction

    3) Proceedings of bridge engineering 2nd  conference April 2009 

    A critical Analysis of Bandra-worli Cable stayed bridge, Mumbai

    4) IJMER(International Journal Of Modern Engineering Research) 

    Advanced Cable Stayed Bridge Construction Process Analysis With ANSYS

    5) Journal Of Engineerig Sciences,Assuit University,Vol. 41 No. 1 pp. – Jan. 2013 

    Parametric Study On Nonlinear static Analysis Of Cable Stayed Bridges

    6) WIKIPEDIA 

    REFERENCES