Calculation of monolithic overpass based on real earthquake records

In order to improve the transport infrastructure of the Republic of Uzbekistan, they began to use the monolithic structure of bridges and overpasses. The article presents the calculation of a monolithic overpass with a length of 120 meters, located in the area of 8-point seismicity according to MSK-64 in the city of Jizzakh over the high-speed railway lines Tashkent-Samarkand (Republic of Uzbekistan). A numerical solution to the problem of seismic resistance of an overpass determines the change in its stress-strain state over time. The results of calculating a monolithic bridge under dynamic load based on records of real accelerograms of the Gazli (Uzbekistan) earthquake, with an intensity of more than 9 points on the MSK-64 scale, are presented. The results of calculations of changes in normal stress in the upper and lower parts of the span along the length of the bridge are analyzed. The calculations show that the bridge has a safety factor for a magnitude 9 earthquake. To ensure guaranteed seismic safety of bridge structures, it is necessary to carry out design calculations based on sets of records of earthquakes that have occurred that are close in dominant frequencies to the characteristics of the construction site.

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