Structural Engineering and Mechanics

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Simplified computational methodology for analysis and studies on behaviour of incrementally launched continuous bridges

  • Sasmal, Saptarshi (Structural Engineering Research Centre, CSIR Campus) ;
  • Ramanjaneyulu, K. (Structural Engineering Research Centre, CSIR Campus) ;
  • Srinivas, V. (Structural Engineering Research Centre, CSIR Campus) ;
  • Gopalakrishnan, S. (Structural Engineering Research Centre, CSIR Campus)
  • Received : 2003.04.09
  • Accepted : 2003.10.02
  • Published : 2004.02.25
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Abstract

Incremental launching method is one of the highly competitive techniques for construction of concrete bridges. It avoids costly and time consuming form work and centralizes all construction activities in a small casting yard, thus saving in cost and time against conventional bridge construction. From the quality point of view, it eliminates the uncertainty of monolithic behaviour by allowing high repetitiveness and industrial environment. But, from analysis and design point of view, the most characteristic aspect of incrementally launched bridges is that, it has to absorb the stresses associated with the temporary supports that are gradually taken on by the deck during its launch. So, it is necessary to analyse the structure for each step of launching which is a tedious and time consuming process. Effect of support settlements or temperature variation makes the problem more complex. By using transfer matrix method, this problem can be handled efficiently with minimal computational effort. This paper gives insight into method of analysis, formulation for optimization of the structural system, effect of support settlement and temperature gradient, during construction, on the stress state of incrementally launched bridges.

Keywords

References

  1. Baur, W. (1977), "Bridge erection by launching is fast, safe and efficient", Civ. Engrg, ASCE, 47(3), 60-63.
  2. BS-5400 Part 4 (1984), "Code of practice for design of concrete bridges", British Standard Institute, London
  3. Granath, P. (1998), "Distribution of support reaction against a steel girder on a launching shoe", J. Const. Steel Res., 47(3), 245-270. https://doi.org/10.1016/S0143-974X(98)00006-6
  4. Grant, A. (1975), "Incremental launching of concrete structure", ACI J., 72(8), 305-402.
  5. Leonhardt, F., Baur, W. and Trah, W. (1966), "Brucke Ober den Rio Caroni, Venezuela. (Bridge over the Rio Caroni, Venezuela), Beton and Stahlbetonbau, 2.
  6. Marchetti, M.E. (1984), "Specific design problems to bridges built using the incremental launching method", Engng Struct., 6(3), 185-210. https://doi.org/10.1016/0141-0296(84)90046-4
  7. Rajasekaran, S. and Sankarasubramanian, G. (2001), Computational Structural Mechanic, Prentice-Hall of India Private Limited, New Delhi.
  8. Rosignoli, M. (1997), "Solution of the continuous beam in launched bridges", Proc. Instn Civ. Engrs. Structs & Bldgs, 122(4), 390-398. https://doi.org/10.1680/istbu.1997.29828
  9. Rosignoli, M. (1998), Launched Bridges: Prestressed Concrete Bridges Built on the Ground and Launched into Their Final Position, American Society of Civil Engineers (ASCE Press), VA.
  10. Rosignoli, M. (1999), "Nose optimisation in launched bridges", Proc. Instn Civ. Engrs. Structs & Bldgs, 134, 373-375. https://doi.org/10.1680/istbu.1999.31903
  11. Rosignoli, M. (2000), "Creep effects during launch of the Serio river bridge", Concrete International, 22(3), 53-59.
  12. Sasmal, S., Ramanjaneyulu, K. and Gopalakrishnan, S. (2002), "Construction phase analysis of incrementally launched continuous span bridges using launching nose", SERC Research Report No. RCS-OLP08741-RR- 2002-5.
  13. Zellner, W. and Svensson, H. (1983), "Incremental launching of Structures", J. Struct. Engrg., ASCE, 109(2), 520-537. https://doi.org/10.1061/(ASCE)0733-9445(1983)109:2(520)

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