Study on Anti-overturning Performance of Double-support-vase Pier Viaduct
The vase pier is widely used in the design of elevated bridges in highway and municipal engineering.In order to study the anti-overturning performance of the double support vase pier elevated bridge,the rationality of different vehicle loads was firstly explored,and secondly the loading method was determined.Then according tothe anti-overturning calculation method in the"Specifications for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts"(JTG 3362-2018),and the calculation state of the corrected boundary conditions after the support detached thirdly,a three-dimensional rod element model for steel box girder bridge and steel concrete composite beam bridge with spans of 3×30 m with different widths and support spacing was established using Midas Civil finite element softwareAfter that,influence lines were used for vehicle load loading.In the end,the critical overturning value of the ratio of bridge width to support spacing was obtained.The results indicate:1)The load used for anti overturning calculation of highway lane Ⅰ is relatively small,and it is recommended to use a dense platoon with a spacing of 3.1 m and the weight of 55 tons;2)Under the same other conditions,the critical values of feature state 1 and feature state 2 that meet the"Specifications for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts"(JTG 3362-2018)are different;3)For bridges with a span of 3x30m,the critical overturning value of the width to support spacing ratio of a steel concrete composite beam bridge is 3.37-3.51,and the critical overturning value of the width to support spacing ratio of a steel box girder bridge is 2.36-2.39.
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