SIMULATION OF BRIDGE SPAN BEHAVIOR DURING THE RECONSTRUCTION OF HIGHWAY OVERCROSSING
Journal Title: Збірник наукових праць Українського державного університету залізничного транспорту - Year 2017, Vol 173, Issue 7
Abstract
Improvement of the computer simulation method of the work of the beam span structure of the overpass bridge during reconstruction according to the scheme of the device of the reinforced concrete slab was carried out. The method uses a step-iterative algorithm with analytic dependencies and finite-element simulation. The calculations include the sequential construction of the facility in three stages, taking into account the nonlinear dependencies of concrete deformation and creep, and aerodynamic effects of the high-speed train. The creep of concrete is based on the use of a generalized kinetic curve of long-term deformation. The aerodynamic load from the high-speed train to the beam span of the overpass, located in close to the railroad, is presented as a running wave with changing positive and negative pressure, centered near the head and tail of the train. The intensity of the impact depends on the speed and the aerodynamic shape of the train, the shape of the structure, the distance between the train and the structure and its location to the train. Modeling of concrete behavior is performed using exponential diagrams. To obtaining an accurate simulation model, taking into account initial damages, a reduction of the concrete class was changed according to the data of the non-destructive strength test with the simultaneous exclusion of the stretched concrete behavior. The obtained finite element model and modeling method of beam span structures made possible to obtain the true bearing capacity of the bridge during reconstruction, and assign a rational reinforcement structure for the loads NK-80 and A-11. The proposed technical activities could be used in the design of engineering structures of the Ukrainian road network, including the case of the aerodynamic effect of the high-speed train.
Authors and Affiliations
Alexey Lobiak, Yevhen Orel, Valentine Sandul
Keywords
Related Articles
- EP ID EP324621
- DOI 10.18664/1994-7852.173.2017.118301
- Views 77
- Downloads 0
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