Research on Straight Construction of Railway Small Radius Curved Simply Supported Beam Curved Bridge
Under difficult or speed limited conditions,the minimum curve radii of railway engineering are 300 m(national railway),150 m(municipal railway),and 150 m(subway),respectively.If bridge engineering is adopted and a simply supported beam structure must be used,there are two methods:curved bridge bending construction or curved bridge straight construction.There are many applications of curved bridge bending construction,but there are drawbacks such as the need to adjust the beam according to the curve radius,the difference in length between the inner and outer sides of the prestressed steel tendon,the risk of overturning,and the bending and torsion effect under self weight.The plan of adopting curved bridge straight construction is worth exploring and researching.Starting from the geometric relationship,this article derives the theoretical algorithm for key parameters such as beam width,beam end seam and top cap size in the straight construction of curved bridges.The ultimate construction dimensions of curved bridges with different spans of simply supported beams under different small curve radius conditions are given.This article verifies that it is feasible to straightly construct a simply supported beam curved bridge under the condition of small curve radius.
railway bridgesmall curve radiussimply supported beamcurved bridge straight construction
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