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Modeling and Analysis of a Steel Truss Railroad Bridge Traversed by Trains at Various Speeds Surendra Baniya Mr

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Modeling and Analysis of a Steel Truss Railroad Bridge Traversed by Trains at Various Speeds Surendra Baniya Mr University of Connecticut OpenCommons@UConn Master's Theses University of Connecticut Graduate School 12-18-2015 Modeling and Analysis of a Steel Truss Railroad Bridge Traversed by Trains at Various Speeds surendra baniya Mr. [email protected] Recommended Citation baniya, surendra Mr., "Modeling and Analysis of a Steel Truss Railroad Bridge Traversed by Trains at Various Speeds" (2015). Master's Theses. 859. https://opencommons.uconn.edu/gs_theses/859 This work is brought to you for free and open access by the University of Connecticut Graduate School at OpenCommons@UConn. It has been accepted for inclusion in Master's Theses by an authorized administrator of OpenCommons@UConn. For more information, please contact [email protected]. Modeling and Analysis of a Steel Truss Railroad Bridge Traversed by Trains at Various Speeds Surendra Baniya B.E., Institute of Engineering/ Pulchowk Campus, Tribhuvan University Kathmandu, Nepal, 2011 A Thesis Submitted in Partial Fulfillment of the Requirements for the Degree of Master of Science at the University of Connecticut 2015 i APPROVAL PAGE Masters of Science Thesis Modeling and Analysis of a Steel Truss Railroad Bridge Traversed by Trains at Various Speeds Presented by Surendra Baniya, B.E. Major Advisor________________________ Ramesh B. Malla, Ph.D. Associate Advisor________________________ Richard Christenson, Ph.D. Associate Advisor________________________ Jeongho Kim, Ph.D. University of Connecticut 2015 ii Acknowledgements This thesis is result of work carried out while working as a Research Assistant during the period August 2013 to Dec 2015 at the Department of Civil Environmental Engineering at University of Connecticut (UCONN), CT. I would like to thank my major advisor, Professor Ramesh Malla, for his excellent guidance and endless support for my research and study here at the UCONN. He has been a great source of inspiration for me and he has helped me continuously throughout my study. A special thanks to my associate advisors Professor Richard Christenson and Professor Jeongho Kim for their teaching and support for this research work. I would like to express gratitude and appreciation to U.S. DOT Federal Railroad Administration; National Academics of Sciences, Engineering and Medicines/Transportation Research Board(TRB) Rail Safety IDEA Programs, and Bentley Systems Inc. for financial support. I am very grateful towards MTA Metro-North Railroad and Connecticut Department of Transportation for their support for the field experiment on the Devon Bridge. Also, the assistance from STRAAM Group for field test and Trans-Tek, Inc. for field test instruments is greatly appreciated. I would like to also extend my sincere appreciation to UCONN for providing me an opportunity for my graduate studies. I would also like to thank my research colleagues, David Jacobs, Suvash Dhakal, Luis Vila, Dominic Kruszewski for their help in this research. Also I am grateful towards Atabak Etemadi and Masoud Mehr for their feedbacks in the finite element modeling. iii Table of contents ......................................................................................................................................... 1 Introduction .................................................................................................................................. 1 Background ....................................................................................................... 1 Motivation ......................................................................................................... 3 Objectives of the thesis research ....................................................................... 3 Overview of the thesis ...................................................................................... 4 ......................................................................................................................................... 5 Literature review .......................................................................................................................... 5 Dynamic analysis of bridge under moving load ............................................... 5 Sensors used in field data acquisition ............................................................... 9 ....................................................................................................................................... 11 Theory ........................................................................................................................................ 11 Structural dynamics theory ............................................................................. 11 Natural frequency and mode shapes of vibration ........................................... 12 Solution methods to obtain response of a structure ........................................ 12 Beam subjected to single moving load ........................................................... 13 Resonance phenomenon in a beam subjected to series of moving train load . 18 Power spectral density and singular value decomposition ............................. 23 Structural damping .......................................................................................... 24 ....................................................................................................................................... 26 Description of bridge studied ..................................................................................................... 26 Introduction ..................................................................................................... 26 Floor system .................................................................................................... 28 Trusses ............................................................................................................ 32 End support conditions ................................................................................... 34 ....................................................................................................................................... 35 Finite element analysis ............................................................................................................... 35 Simply supported beam (bridge) traversed by moving vehicle ...................... 35 Finite element modelling and analysis of Devon truss bridge ........................ 43 iv Summary of results from finite element analysis ........................................... 65 ....................................................................................................................................... 66 Experimental field testing and data processing ......................................................................... 66 Experimental field testing ............................................................................... 66 Field test data processing and calculation of dynamic response of bridge ..... 72 Summary and conclusion ................................................................................ 80 ....................................................................................................................................... 81 Comparison of bridge response results obtained from finite element model and experimental field testing............................................................................................................................. 81 The Modal Assurance Criterion for comparison of mode shape vectors of Devon Bridge .................................................................................................................. 81 Comparison of natural frequencies of Devon bridge obtained from FEM and field test ............................................................................................................... 84 Comparison of vertical displacement of Devon bridge obtained from FEM and field test ............................................................................................................... 84 Summary and conclusion: ............................................................................... 86 ....................................................................................................................................... 87 Analysis of resonance phenomenon of Devon truss bridge under various passenger trains. .... 87 Vertical displacement of a truss node from FEM for various train moving at various speeds. ..................................................................................................... 90 Lateral displacement of a truss node from FEM for various train moving at various speeds. ..................................................................................................... 92 Comparison of time history of displacement obtained from FEM for some locations of the bridge at resonant and cancellation (non- resonant) speed. ....... 94 ....................................................................................................................................... 96 Summary and conclusion, and recommendations for future research ....................................... 96 Summary and conclusion: ............................................................................... 96 Recommendations for future research ............................................................ 98 Appendix-A................................................................................................................................... 99 Appendix- B ...............................................................................................................................
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