Predicting and justification the service life designed reinforced concrete bridges
https://doi.org/10.52170/1815-9265-2023-66-13
Abstract
The article outlines the problem of directive assignment of the bridges service life in the current regulatory documents, in the absence of mechanisms for calculating and justifying these terms for a particular structure taking into account the conditions of its operation. The service life is one of the defining characteristics responsible for the main parameters of the bridge structure. The existing promising approaches that can be used to predict the durability of bridges are listed, as well as the main defects that are often encountered when examining reinforced concrete road bridges. This study proposes a method for determining the service life of a reinforced concrete slab of a carriageway of a beam span, based on the description of the mechanisms of degradation of the protective layer and the kinetics of corrosion processes. The period of degradation of the protective layer is described by two processes running in parallel: the carbonization of concrete, as well as the penetration and accumulation of chlorides to a critical value. The description of these processes is based on the fundamental laws of the Fick's laws of diffusion. The model of changes in such climatic parameters as ambient temperature and humidity is proposed to be represented as a sinusoidal function. A piecewise linear function of the change in the surface concentration of chlorides over time is proposed, simulating a sharp increase in the concentration in the winter period from the treatment of the carriageway of road bridges with anti-icing materials. A stochastic approach is presented that makes it possible to take into account the random nature of the initial parameters, which is based on the Monte Carlo method. The calculation was carried out in accordance with the stochastic model of the reinforced concrete beam superstructure of the bridge. Based on the calculation results, distribution histograms of the main service life periods were obtained, and integral distribution functions were constructed.
About the Authors
D. A. Shestovitskiy
Emperor Alexander I St. Petersburg State Transport University
Russian Federation
Russian Federation
Dmitriy A. Shestovitskiy, Associate Professor of the Bridges Department, Candidate of Engineering
V. N. Myachin
Research and Design Institute of Territorial Development and Transport Infrastructure
Russian Federation
Russian Federation
Valeriy N. Myachin, General Director, Doctor of Engineering, Professor
D. A. Yaroshutin
Bridges Competence Center
Russian Federation
Russian Federation
Dmitriy A. Yaroshutin, General Director
A. B. Zorin
Research and Design Institute of Territorial Development and Transport Infrastructure
Russian Federation
Russian Federation
Andrey B. Zorin, Principal Specialist
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Review
For citations:
Shestovitskiy D.A., Myachin V.N., Yaroshutin D.A., Zorin A.B. Predicting and justification the service life designed reinforced concrete bridges. Bulletin of Siberian State University of Transport. 2023;(3):13-27. (In Russ.) https://doi.org/10.52170/1815-9265-2023-66-13
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