Safety of Reinforced Concrete Bridges With Spans Structures

Krasnoshchekov, Yu. V.

doi:10.26518/2071-7296-2018-6-922-932

Cited by 3 publications

(2 citation statements)

References 1 publication

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“…The quality control methods are the source of primary information for decision-making to ensure the required level of reliability during design, construction and operation [12][13]. Further development is impossible without improving the methods of calculation of structures based on probabilistic approaches [14][15].…”

Section: Introductionmentioning

confidence: 99%

Implications of the compressive strength control accuracy on the probability of accepting defective concrete elements

Leykin,

Belentsov,

Kazanskaya

2023

E3S Web Conf.

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The contribution of control method inaccuracy to the accuracy and performance of building structures while adhering to the metrological requirements for the strength determination process in reference materials is analysed. The metrological fundamentals for improving the testing and quality control methods of modern concretes and their impact on the reliability of erected structures are developed. The measurement accuracy dependence on the quality control of concrete materials and products by destructive methods is established, the number of rejected products is determined. The accuracy of concrete quality control is assessed in relation to the likelihood of defective products. A Bayesian model is proposed for the probability of missing a defective product with known control confidence and the probability of error due to measurement and testing error in the control process. The additional probability of missing concrete defects in strength when testing in standard specimens by the destructive method due to imperfect test methods is calculated. The 'non-zero probability' of missing a defect in the concrete strength control process affecting the level of reliability is assessed, provided the metrological requirements for the test are met.

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Section: Introductionmentioning

confidence: 99%

Implications of the compressive strength control accuracy on the probability of accepting defective concrete elements

Leykin,

Belentsov,

Kazanskaya

2023

E3S Web Conf.

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“…По данным обследований мостов в Российской Федерации и Республики Беларусь около 80 % мостов требуют того или иного вида ремонта. Для осуществления программы приведения мостов в относительно благополучное состояние необходимы значительные материальные затраты [1][2][3]. В настоящее время отчисления на эксплуатацию мостов составляют 1-4 % их стоимости и выделяются из бюджетных средств.…”

Section: Introductionunclassified

Costs planning and ways to improve bridge operation service

Gugа

Александрович²,

Averchenko

et al. 2021

Transportation Systems and Technology

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Repair and reconstruction is an integral part of the life cycle of such structures as: bridges, overpasses, aqueducts. Timely maintenance and repair of bridge structures contributes to the continuous improvement of their technical level, as well as to the operational state with increasing load and intensity over time on constantly under construction highways. This article presents the results of a study of the need to repair structures over time. The article contains a description of the types of work, as well as the terms when these works need to be performed, graphs of the volume and cost of work are given. As materials and initial data, the data of approximate turnaround periods of elements of bridge structures were taken, as well as a table of the frequency of repairs by year was compiled. Based on the collected data, graphs of the cost and changes in the volume of work were built over time. In addition, graphs of the cost of repairing individual elements of the structure are given in relation to the total cost of the structure. Based on the results obtained, recommendations are formulated for planning the repair of expatriated bridge structures by bridge maintenance departments. A set of measures is also proposed to eliminate existing violations and further operation of the bridge structure. A set of works for the repair of individual units and structures is recommended. Arguments are given for the need to share responsibilities between bridge operation departments during the repair of the structure.

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Probability calculation of building structures considering asymmetry of random values and functions distribution

Krasnoshchekov

2020

Vestn. SibADI

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Introduction. The calculation of structures by the semi-probability method of limit states does not answer the question how reliable the construction is. Probabilistic methods are still imperfect, and attempts to use them to evaluate structures reliability calculated with limit states sometimes lead to contradictory results. A possible reason for this is the lack of research on the influence of the asymmetry of variable distribution functions on the theoretical reliability of structures. The purpose of the research is to develop a practical method for calculating the reliability of structures with considering the asymmetry of the functions distribution and to test the method for evaluating the reliability of bent reinforced concrete elements.Materials and methods. The reliability of structures is estimated by the variability of the strength reserve function based on the methods of moments and design points. A method is proposed for approximating the reliability of fairly complex compositions of random variables using statistical parameters (expectation, standard deviation, and skewness coefficient) of two-element functions approximated by a lognormal three-parameter distribution.Conclusions. Considering the coefficient of the values system asymmetry in the probability calculation allows to justify the reliability of the bent reinforced concrete element designed according to the limit states. On the example of the calculation with the proposed method shown that the availability of the calculation values of the bearing strength of the reinforce concrete element in normal cross section is equal despite the values of the forces in the pressed reinforce concrete or positive reinforcement are indicated. If there is a positive asymmetry, the calculation results using the normal distribution may be significantly underestimated. It is concluded that the value of the asymmetry coefficient of the system of variables can be a justification for the use of normal or lognormal distribution for evaluating the reliability of structures. Ignoring the asymmetry of variables in probabilistic calculations can significantly distort the assessment of the reliability of structures.

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Safety of Reinforced Concrete Bridges With Spans Structures

Cited by 3 publications

References 1 publication

Implications of the compressive strength control accuracy on the probability of accepting defective concrete elements

Implications of the compressive strength control accuracy on the probability of accepting defective concrete elements

Costs planning and ways to improve bridge operation service

Probability calculation of building structures considering asymmetry of random values and functions distribution

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