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Title: ANALYSIS AND DESIGN OF ASSEMBLED STEEL TRUSS BRIDGES
Authors: TIHITINA, SIYOUM
Advisors: Prof . Negussie Tebedge
Copyright: 2007
Date Added: 17-Oct-2008
Publisher: Addis Ababa University
Abstract: Table of Contents Acknowledgement………………………………………..……...……………........……i List of Symbols ……… …………………………………….......…….………......…...iv List of Tables…….....…………………………….…………...…....………..…………..vii List of Figures……………….....…………………….……...………………...….....…...viii List of Appendices…...……….....…………………….……...………………...…...…...xii Abstract……...........………………………………………....…………….…….….…....xiii 1. Introduction.............................................................................................................1 1.1 Background…………………………...………..………………………………...1 1.2 Objective ………………...………...………………………………………….....1 1.3 Thesis Content .........…………….………………..........…………………..….....1 1.4 Application of the study and limitations..……………………............…....……...1 2. Bridge Structure.......................................................................................................3 2.1. General………………………....……………….……………………..….….…..3 2.2. Classification of Bridges…….................……....………………..…………..…...3 2.3. Selection of bridge type..................………. …………………..... …..…..….…...5 2.4. Steel truss of Bridges…………………………………….....……………….…....6 2.4.1. Description....................……………….. ……………………..……….…....6 2.4.2. Why use steel truss bridges?...……... …………………………………........6 2.4.3. Steel bridges in Ethiopia....…………………….. ………………….….........7 3. Analysis and Design of Steel Truss Bridges...........................................................8 3.1. Bridge loading.……………....................................……………………..…….....8 3.1.1. Dead Load.....……….…………... …………………….…………………....8 3.1.2. Live Load...................……………....…….……………………………........8 3.1.3. Dynamic load allowance..............................……..........………………….....10 3.1.4. Wind load..………................................………….…………………….........11 3.1.5. Earth quake Loading..........................................… ……………………........11 3.2. Load Factors and Combinations.. …….…....………..……................…………...11 3.3. Load Application.....................…………........ ………..…....….…………….…..13 3.4. Interior Stringers............................................ …………………………………....14 3.5. Exterior Stringers..................... …………………........……………………….….14 3.6. Floor beams........................................................................…………………….…14 3.7. Live load Truss Stresses...................…..……...........………….............................15 3.8. Truss dead loads ...............……..............………............................................…..15 iii 3.9. Selection of Truss member........................……...................... ……....................16 3.10. Bridge Truss Deflection.....................................................…….........……...16 4. Selected bridges survey and design example........................................................17 4.1. Assessment of locally built Baily bridges.............................. ……..….…....…..17 4.2. Analysis and Design Example. ………................................................................21 4.2.1 X-Shaped Panel..................................................................................................21 4.2.1.1 Design Data.....................................................................................................21 4.2.1.2 Design of stringers...........................................................................................21 4.2.1.3 Design of floor beams......................................................................................34 4.2.1.4 Design of truss ................................................................................................43 4.2.2 Diamond Shaped Truss.......................................................................................54 4.2.2.1 The first option.................................................................................................55 4.2.2.1.1 Design Data...................................................................................................55 4.2.2.1.2 Design of floor beams ..................................................................................56 4.2.2.2 The second option............................................................................................64 4.2.2.2.1 Definition of geometry, boundary conditions and loading...........................65 4.2.2.2.2 Selection of design criteria............................................................................65 4.2.2.2.3 Evaluation of plate thickness t, and/ or other selected design criteria..........66 4.2.2.2.4 Design procedure..........................................................................................66 4.2.2.2.5 Design of the deck plate...............................................................................67 4.2.2.2.6 Stiffened Plate Deck.....................................................................................70 4.2.2.2.7 Design of floor beams...................................................................................74 4.2.2.2.8 Design of truss..............................................................................................82 4.2.2.2.9 Design of connections...................................................................................95 4.2.2.2.9.1 Design of welded connections....................................................................95 4.2.2.2.9.2 Design of pin and pin plates for panel connection.....................................99 4.3 Cost comparisons .................................................................................................103 5 Conclusions and Recommendations........................................................................104 5.2 Conclusions……………………………………………………...………..........…....104 5.3 Recommendations…………………………………..……………...…….….............105 References…....................................................................................................................105 Appendix A.......................................................................................................................106 Appendix B.......................................................................................................................109
Description: THESIS SUBMITTED TO THE SCHOOL OF GRADUATE STUDIES OF ADDIS ABABA UNIVERSITY IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE IN CIVIL ENGINEERING
URI: http://hdl.handle.net/123456789/1468
Appears in:Thesis - Civil Engineering

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