To improve the transport infrastructure of the Republic of Uzbekistan, the monolithic structure of bridges and overpasses began to be used. The article presents the calculation of a monolithic overpass on the 1083rd km of the M-39 highway passing through Samarkand. The results of the calculation of a monolithic overpass from dynamic load are presented based on the records of two real seismograms for two dangerous earthquakes for the system with spectral composition: Gazli (Uzbekistan) and Manjil (Iran). The calculations show that to ensure guaranteed seismic safety of transport structures, it is necessary to carry out design calculations based on sets of records of earthquakes that occurred, close in dominant frequencies to the characteristics of the construction site. Such a provision should be introduced into the relevant regulatory documents.
The article analyzes the technical condition of urban reinforced concrete bridge structures. The authors studied the technical passports of all bridges and overpasses in Tashkent and made direct technical inspections of more than 10 bridge structures. As a result, most of the shortcomings and defects of the existing bridge structures in the city were revealed. In Tashkent, there is a significant number of reinforced concrete bridge structures, the service life of 60 to 100 years (24% of the total number), a significant part of which (42%) has been operated for many years without major repairs. A "four-level" approach is proposed, which contains four stages of analysis, and evaluates the technical condition of the operated reinforced concrete bridge structures.
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