Abstract：Research purposes: In order to overcome the shortcomings of the cast-in-place method with full support, the technology of converting simply supported beam into continuous beam was applied for the first time in the construction of high-speed railway turnout continuous beam bridges. By construction simulation with finite element method, and comparing actual cost, construction period of Baoji-Lanzhou High-speed Railway, this paper aimed to verify the mechanical rationality and economic superiority of the proposed construction method, optimize the closing parameters, and give the engineering application suggestions. Research conclusions: (1) Compared with completely simply supported beam system, the passing stiffness of the simply-supported-to-continuous beam system is greatly improved, which can meet the deformation limit of the turnout structure on the bridge. (2) Compared with the completely continuous beam system, the proposed system has completed most of the shrinkage and creep and uneven settlement during the beam erection process. So the additional deformation and secondary internal force caused by creep and settlement are greatly reduced after system conversion, and mechanical properties of the bridge become stronger. (3) The simply-supported-to-continuous construction method can achieve huge benefits in terms of cost and construction period, by moving moulds casting method, precast-in-factory method, and avoid cast-in-place construction. (4) In the simply-supported-to-continuous construction, it is beneficial to reduce structural displacement and secondary internal forces by anchoring the closure steel beam downwards and symmetrical closure of side span first then mid span. (5) The research results can provide an empirical reference for the construction of a large number of high-speed railway turnout continuous beam bridges in the future.
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XU Bin. Research on the Design of High-speed Railway Turnout Continuous Beam Bridges Based on Converting Simply Supported Beams into Continuous Beam. Journal of Railway Engineering Society, 2022, 39(2): 68-72.
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2022, Vol. 39 
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