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Monitoring and calculation of residual life of emergency bridge crossings through water-conducting structures

Abstract

Monitoring and calculation of residual life of emergency bridge crossings through water-conducting structures

Bandurin M.A.

  Modelling results of technical state of long-operated bridge crossings across conveyance structures are given in the article. As a result of the experiment a solid-state model for bearing element of a bridge crossing across conveyance canals was constructed. The stress-strain state of ferroconcrete bearing elements under various load combinations is considered. As a result of numerical experiments carried out zones of forming defects and damages on bearing elements of bridge crossings across conveyance canals were marked out. These zones may have characteristic damages of the same type that makes it possible to regulate the process of laying georadar sounding profiles and defining points in which it is necessary to measure concrete strength when conducting inspections on location. In this connection modeling defects on a column by way of formation voids and ferroconcrete unseals with diameters from 50 mm to 100 mm was carried out. Intensive danger threshold for forming voids and ferroconcrete unseals beginning from 100 mm diameter was fixed.

Keywords: hydraulic structures, conveyance structures, bridge crossings, operation monitoring, modeling, technical state, solid-state model, danger threshold, voids, unseals