Force Analysis of Flange Plate of Staggered and Widened Continuous Girder Bridge
In order to study the stress status of the flange plate of the staggered hole continuous beam bridge,the whole bridge lattice model is established by Midas,the influence of various factors on the internal force of the flange plate between the old and new bridges is calculated and analyzed,and the reinforcement measures of the flange plate of the old bridge after the widening are proposed.Research shows that the effect of shrinkage creep on the flange plate is relatively small,it is appropriate to choose to splicing the old and new bridges between 3～6 months after the completion of the new bridge,and it doesn't make much sense to extend the splicing time too long.The continuous beam of staggered hole splicing should fully consider the influence of the settlement of the foundation of the new bridge,and the settlement should be minimized when designing the foundation of the new bridge.The prestressed continuous beam should pay attention to the transverse secondary internal force of the flange plate generated by the longitudinal prestressed steel bundle,but the relaxation of the prestressed steel bundle of the new bridge has basically no effect on the internal force of the flange plate.The force of the flange plate after the hole is widened is complicated,and the local loading of the live load cannot correctly reflect the force of the flange plate,and the full-bridge modeling analysis is required.
bridge engineeringcontinuous beam bridgeflange platesshrink and creepsettlementstaggered holeswidened bridges
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