Calculation of monolithic bridges taking into account seismic conditions of Republic of Uzbekistan

Abstract

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.

Calculation of Continuous Reinforced Concrete Bridges And Overpasses Inseismically Hazardous Areas

“…Bridge structures are made up of many elements, the most important of which are piers and bearing parts. The piers and the bearing parts are the most vulnerable elements of the bridge structure; therefore, seismic isolating devices, particularly rubber-metal ones, are used for the bearing part [15,16]. The bearing part is a seismic isolation device and allows the span to move in the longitudinal direction within the range from 0.1 m to 0.35 m, depending on the models used, due to low shear stiffness.…”

“…In recent years, there has been an increased interest in the world in the modernization and expansion of the road network, including bridge structures, using modern technologies and designs of bridges and overpasses made of monolithic reinforced concrete. Even though monolithic construction began its development relatively recently, at present, this method of construction is considered the most promising one [4,5]. Monolithic bridges are used in all developed countries worldwide.…”

“…The main feature of monolithic construction is that the construction site is the place to produce materials for monolithic bridges and other engineering structures. The use of monolithic reinforced concrete makes it possible to implement various architectural forms and reduce steel consumption by 7-20% and concrete by 10-12% [5,6].…”

Improving Reliability of Uzbekistan’s Transport Infrastructure Facilities Under Impact of Natural Hazards by Analysis of Its Vulnerability, Monitoring and Modeling

“…Depending on the severity of the earthquakes and the construction design bridges can be even destroyed. The bridges and bridge structures are constructed of many elements, the most important of which are piers and bearing parts [6,[10][11][12].…”

“…The limited application is related to concerns over the failure of the track structure on the bridge [12,14] due to the high buckling of the support parts and the high horizontal forces of the braking load. Nevertheless, there are a few cases of the successful application of seismic insulation of railway bridges in bridge construction practice.…”