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Comparative Study on Analysis and Design of Skew Bridge by STAAD and ETABS Software using Finite Element Method

Skew bridges are required to cross the drains at any angle other than normal. These can be helpful in making straight crossing or utilizing the available land where normal crossing are either impossible or not suitable. The slab bridges are uneconomical for large spans due to excessive design thickness but good for small spans due to its easy execution.Bending Moment result comparison between both software i.e. Staad Pro and Etabs show little variation For Span 15 m on Staad Pro and Etabs is 74.518 kn sq.mm and 68.40kn sq.mm respectively, For Span 17 m on Staad Pro and Etabs is 71.47 kn sq.mm and66.70 kn sq.mm respectively and For Span 19 m on Staad Pro and Etabs is 79.73 kn sq.mm and71.95 kn sq.mm respectively. At constant skew angle for varying span length the torsional bending moment gradually shift toward obtuse acute angle. In both the software i.e. STAAD and ETAB the ETAB give more appropriate result in compare to STAAD. Patil Akshay Mukund | Nitesh Kushwaha "Comparative Study on Analysis & Design of Skew Bridge by STAAD and ETABS Software using Finite Element Method" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-4 | Issue-1 , December 2019, URL: https://www.ijtsrd.com/papers/ijtsrd29788.pdf Paper URL: https://www.ijtsrd.com/engineering/civil-engineering/29788/comparative-study-on-analysis-and-design-of-skew-bridge-by-staad-and-etabs-software-using-finite-element-method/patil-akshay-mukund<br>

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Comparative Study on Analysis and Design of Skew Bridge by STAAD and ETABS Software using Finite Element Method

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  1. International Journal of Trend in Scientific Research and Development (IJTSRD) Volume 4 Issue 1, December 2019 Available Online: www.ijtsrd.com e-ISSN: 2456 – 6470 Comparative Study on Analysis & Design of Skew Bridge by STAAD and ETABS Software using Finite Element Method Patil Akshay Mukund1, Nitesh Kushwaha2 1M.Tech. Scholar, 2Professor, 1,2Department of Civil Engineering, Millennium Institute of Technology & Science, Bhopal, Maharashtra, India ABSTRACT Skew bridges are required to cross the drains at any angle other than normal. These can be helpful in making straight crossing or utilizing the available land where normal crossing are either impossible or not suitable. The slab bridges are uneconomical for large spans due to excessive design thickness but good for small spans due to its easy execution. Bending Moment result comparison between both software i.e. Staad Pro & Etabs show little variation: For Span 15 m on Staad Pro & Etabs is 74.518 kn/sq.mm & 68.40kn/sq.mm respectively, For Span 17 m on Staad Pro & Etabs is 71.47 kn/sq.mm &66.70 kn/sq.mm respectively & For Span 19 m on Staad Pro & Etabs is 79.73 kn/sq.mm &71.95 kn/sq.mm respectively. At constant skew angle for varying span length the torsional bending moment gradually shift toward obtuse/acute angle. In both the software i.e. STAAD and ETAB the ETAB give more appropriate result in compare to STAAD. How to cite this paper: Patil Akshay Mukund | Nitesh Kushwaha "Comparative Study on Analysis & Design of Skew Bridge by STAAD and ETABS Software using Finite Element Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456- 6470, Volume-4 | Issue-1, December 2019, pp.970-977, www.ijtsrd.com/papers/ijtsrd29788.pdf Copyright © 2019 by author(s) and International Journal of Trend in Scientific Research and Development Journal. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (CC (http://creativecommons.org/licenses/by /4.0) Method" IJTSRD29788 URL: BY 4.0) 1.INRODUCTION Bridge is an important structure required for the transportation network. Now a day with the fast innovation in technology the conventional bridges have been replaced by the cost effective structured system. For analysis and design of these bridges the most efficient methods are available. Different methods which can be used for analysis and design are AASHTO, Finite element method, Grillage and Finite strip method. OBJECTIVES ?Study of Skew Bridge with different length under Loading Condition. METHODOLOGY Skew bridges are required to cross the drains at any angle other than normal. These can be helpful in making straight crossing or utilizing the available land where normal crossing are either impossible or not suitable, depending on the length of short diagonal of skew slab being less or greater than its span measured along the traffic. Two specimens tested experimentally, i.e. 1.Skew slab with ratio of short diagonal to span less than unity. 2.Skew slab with ratio of short diagonal to span greater than unity. ANALYSIS & RESULTS STAAD PRO Following steps are required in a sequence for proper completion: Step-1 Preparation of geometry of tower in STAAD PRO @ IJTSRD | Unique Paper ID – IJTSRD29788 | Volume – 4 | Issue – 1 | November-December 2019 Page 970

  2. International Journal of Trend in Scientific Research and Development (IJTSRD) @ www.ijtsrd.com eISSN: 2456-6470 Fig 4.1 Plan view of slab with 15m span length at 15◦ skew angle Fig 4.2 3D view of slab with 15m span length at 15◦ skew angle Fig 4.3 Plan view of slab with 17m span length at 15◦ skew angle @ IJTSRD | Unique Paper ID – IJTSRD29788 | Volume – 4 | Issue – 1 | November-December 2019 Page 971

  3. International Journal of Trend in Scientific Research and Development (IJTSRD) @ www.ijtsrd.com eISSN: 2456-6470 Fig 4.4 3D view of slab with 17m span length at 15◦ skew Angle Fig 4.5 Plan view of slab with 19m span length at 15◦ skew angle Fig 4.6 3D view of slab with 19m span length at 15◦ skew angle Step-2 Assigning of support conditions. @ IJTSRD | Unique Paper ID – IJTSRD29788 | Volume – 4 | Issue – 1 | November-December 2019 Page 972

  4. International Journal of Trend in Scientific Research and Development (IJTSRD) @ www.ijtsrd.com eISSN: 2456-6470 Fig 4.7 Support on slab with 15m span length at 15◦ skew angle Fig 4.8 Support on slab with 17m span length at 15◦ skew angle Fig 4.9 Support on slab with 19m span length at 15◦ skew angle @ IJTSRD | Unique Paper ID – IJTSRD29788 | Volume – 4 | Issue – 1 | November-December 2019 Page 973

  5. International Journal of Trend in Scientific Research and Development (IJTSRD) @ www.ijtsrd.com eISSN: 2456-6470 Step-3 Assigning vehicle load as per specification. Fig 4.10 Load on slab with 15m span length at 15◦ skew angle Fig 4.11 Load on slab with 17m span length at 15◦ skew angle Fig 4.12 Load on slab with 19m span length at 15◦ skew angle @ IJTSRD | Unique Paper ID – IJTSRD29788 | Volume – 4 | Issue – 1 | November-December 2019 Page 974

  6. International Journal of Trend in Scientific Research and Development (IJTSRD) @ www.ijtsrd.com eISSN: 2456-6470 Step-4 Analysis M k N < = 0 . 3 6 2 5 . 6 8 1 1 1 6 . 3 2 1 . 6 2 7 3 2 . 3 3 7 . 6 4 2 . 9 4 8 . 2 5 3 . 6 5 8 . 9 6 4 . 2 6 9 . 5 7 4 . 8 8 0 . 2 > = 8 5 . 5 Y ( l o c m / m a l ) Y X Load 2 Z Fig 4.13 Analysis of slab with 15m span length at 15◦ skew angle a l ) M k N < = 0 . 3 6 2 5 . 6 8 1 1 1 6 . 3 2 1 . 6 2 7 3 2 . 3 3 7 . 6 4 2 . 9 4 8 . 2 5 3 . 6 5 8 . 9 6 4 . 2 6 9 . 5 7 4 . 8 8 0 . 2 > = 8 5 . 5 Y ( l o c m / m Y X Load 2 Z Fig 4.14 Analysis of slab with 17m span length at 15◦ skew angle a l ) M k Y ( l o c m / N m < = 0 . 0 4 0 5 . 1 1 1 0 . 2 1 5 . 2 2 0 . 3 2 5 . 4 3 0 . 5 3 5 . 5 4 0 . 6 4 5 . 7 5 0 . 7 5 5 . 8 6 0 . 9 6 5 . 9 7 1 7 6 . 1 > = 8 1 . 1 Y Z X Load 2 Fig 4.15 Analysis of slab with 19m span length at 15◦ skew angle @ IJTSRD | Unique Paper ID – IJTSRD29788 | Volume – 4 | Issue – 1 | November-December 2019 Page 975

  7. International Journal of Trend in Scientific Research and Development (IJTSRD) @ www.ijtsrd.com eISSN: 2456-6470 GRAPHICAL REPRESENTATION MOMENT ON BRIDGE BY BOTH SOFTWARE GRAPH OF MAXIMUM DISPLACEMENT Graph 5.1 Maximum Displacement Graph GRAPH OF MAXIMUM STRESS Graph 5.2 Maximum Stress Qx Graph Graph 5.3 Maximum Stress Qy Graph @ IJTSRD | Unique Paper ID – IJTSRD29788 | Volume – 4 | Issue – 1 | November-December 2019 Page 976

  8. International Journal of Trend in Scientific Research and Development (IJTSRD) @ www.ijtsrd.com eISSN: 2456-6470 CONCLUSION The load capacity of the tilting slab increases as the tilting angle increases. Up to the angle of inclination 15° the behavior of the slanted slab is almost similar to the rectangular slab. 1.Considerable torsion of deck slab. 2.Displacement result comparison between both software i.e. Staad Pro & Etabs show very nominal variation: REFERENCES [1]Ajay D. Shahu, S. V. Joshi (2016)“Analysis and behaviour of skew bridges with different skew angle” Volume 3 IJCESR. [2]Al.l Mubaydeen, H.Y.H 2005 Stress Distribution at the Corner of Continuous Skew Bridges, M.Sc.l Thesis, University of Jordan, Amman, Jordan. [3]Alasa'd Intesar, 1977.l Stress Distribution at the Corners of Skew Bridges, M.l Sc.l Thesis, University of Jordan, Amman, Jordan.l PP.l (1-136). a. For Span 15 m on Staad Pro & Etabs is 17.016mm & 17.047mm respectively. b.For Span 17 m on Staad Pro & Etabs is 14.641mm & 14.204mm respectively. c. For Span 19 m on Staad Pro & Etabs is 13.638mm & 13.218mm respectively. [4] Al-Foqaha'a, A.l 1994.l Study of Recent Loading Adopted for Bridge Design in Jordan, M.l Sc.l Thesis, University of Jordan, Amman, Jordan. [5]Alfred G. Bishara, Maria Chuan Liu And Nasser [6]Australian Bridge Design code, AUSTROADS, 1992 3.Bending Moment result comparison between both software i.e. Staad Pro & Etabs show little variation: [7]Bridge Design using the STAAD. Pro/Beava”, IEG Group, Bentley Systems, Bentley Systems Inc., March 2008. a. For Span 15 m on Staad Pro & Etabs is 74.518 kn/sq.mm & 68.40 kn/sq.mm respectively. b.For Span 17 m on Staad Pro & Etabs is 71.47 kn/sq.mm & 66.70 kn/sq.mm respectively. c. For Span 19 m on Staad Pro & Etabs is 79.73 kn/sq.mm & 71.95 kn/sq.mm respectively. [8]Cement & Concrete Association, Construction Industry Research and Information Recommendations on the use of Grillage Analysis for Slab and Pseudo-Slab Bridge Decks, London, SW1WOAQ, 1973. Association, 4.At constant skew angle for varying span length the torsional bending moment gradually shift toward obtuse/acute angle. [9]Computer & Structures, Inc., SAP90 (Finite Element Analysis Users Manual), Berkeley, California.l 94704 USA, 1989.l PP.300. [10]Corley, W.l G.l Huang, T.l and Jurkovich, W.J.l 1973.l Preliminary Design and Proportioning of Reinforced Concrete Bridge Structures.l ACI Journal.l 70 (5): 328- 336. @ IJTSRD | Unique Paper ID – IJTSRD29788 | Volume – 4 | Issue – 1 | November-December 2019 Page 977

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