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Endurance Assessment of the Concrete and Reinforced Concrete Load-Bearing Structures, Impregnated by Petroleum

Endurance Assessment of the Concrete and Reinforced Concrete Load-Bearing Structures, Impregnated by Petroleum

Abstract

In many concrete and reinforced concrete elements of load-bearing structures, exposed to the frequently changing loads, accumulated fatigue damage of the material, leading to destruction. Petroleum products which impregnate concrete and reinforced concrete structures have a negative influence on their physical and mechanical properties and contribute to the formation of damages. Wherein said negative effect is largely depend on the viscosity of petroleum products. Currently available guidelines for assessing endurance of concrete and reinforced concrete elements do not fully take into account the effect of viscosity of petroleum products on their physical and mechanical characteristics. This restrains the solution of the tasks to ensure the maintenance safety conditions of industrial buildings in technological processes that use petroleum products. Based on the analysis of the test results on the endurance of concrete and reinforced concrete elements obtained an empirical formula to estimate the accumulation of fatigue depending on the number of loading cycles and the conditional viscosity impregnating of petroleum products. Represented mathematical description of the endurance assesment allows to determine the index of safety and available resources of concrete and reinforced concrete elements of load-bearing structures under the influence of various petroleum products.

Во многих бетонных и железобетонных элементах несущих конструкций, подверженных часто меняющимся нагружениям, накапливаются усталостные повреждения материала, приводящие к разрушению. Нефтепродукты, пропитывающие бетонные и железобетонные конструкции, оказывают негативное влияние на их физико-механические характеристики и способствуют образованию повреждений. При этом указанное негативное влияние в значительной степени зависит от вязкости нефтепродуктов. В настоящее время имеющиеся рекомендации по оценке выносливости бетонных и железобетонных элементов не в полной мере учитывают влияние вязкости нефтепродуктов на их физико-механические характеристики. Это сдерживает решение задач обеспечения безопасных условий эксплуатации промышленных зданий, в технологических процессах которых используются нефтепродукты. На основе анализа результатов испытаний на выносливость бетонных и железобетонных элементов получена эмпирическая формула оценки накопления усталости в зависимости от количества циклов нагружений и условной вязкости пропитывающих нефтепродуктов. Представленное математическое описание оценки выносливости позволяет определять индекс безопасности и имеющийся ресурс бетонных и железобетонных элементов несущих конструкций, находящихся под воздействием различных нефтепродуктов.

Keywords

выносливость, endurance, прочность, микротрещины, напряжение, industrial buildings, load, destruction, бетон, petroleum products, stress, условная вязкость, viscosity, load-bearing capacity, safety index, concrete, fatigue, нефтепродукты, железобетон, microcracks

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
Green