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Structural Engineering and Mechanics
  Volume 17, Number 2, February 2004, pages 245-266

Simplified computational methodology for analysis and studies on behaviour of incrementally launched continuous bridges
Saptarshi Sasmal, K. Ramanjaneyulu, V. Srinivas and S. Gopalakrishnan

    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.
Key Words
    incrementally launched continuous bridge; construction phase analysis; transfer matrix; optimisation; thermal analysis; settlement analysis; launching nose; nose-deck interaction; length ratio; load ratio; stiffness ratio.
Structural Engineering Research Centre, CSIR Campus, Taramani, Chennai-600113, India

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