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магистерская диссертация

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Abstract

В работе рассматривается вопрос применения высокопрочных модифицированных бетонов при возведении сооружений башенного типа, подверженных температурно-влажностным воздействиям, на примере дымовых труб. Замена традиционно применяемых для таких сооружений бетонов на высокопрочные позволит уменьшить толщину стенок железобетонных оболочек стволов, снизить массу сооружений, нагрузки на фундамент и грунтовое основание, а также уменьшить температурные перепады и, как следствие, температурные напряжения. Проведен анализ научных исследований по влиянию температурно-влажностных воздействий на прочностные и деформационные свойства обычных тяжелых и высокопрочных модифицированных бетонов позволяющий сделать выводы о существенном преимуществе последних. Подобран метод численного анализа напряженно-деформированного состояния с учетом физической нелинейности с использование программного комплекса ЛИРА-САПР. Приведены результаты расчетов напряженно-деформированного состояния железобетонных стволов дымовых труб H=250 м и H=90 м методом конечных элементов, наиболее точно отражающие их работу в условиях температурно-влажностных воздействий. Показана эффективность применения высокопрочных бетонов на примерах возведения стволов железобетонных дымовых труб, подвергающихся воздействиям температурных и влажностных перепадов.

This work considers the use of high-strength modified concretes for erection of tower type buildings that are affected by temperature and humidity based on example of chimneys. Replacing traditionally used concretes for such structures to high-strength concretes will reduce:the thickness of walls of reinforced concrete shells ofshafts, the mass of structures, the loading on the foundation and thebasement, and also the replacing is used for reducing the temperature drops and thereaftertemperature stresses. The analysis of researches of the temperature and humidity affection on strength and deformation properties of traditional heavy and high-strength modified concretes is carried out. This analysis leads to the conclusion that a high-strength modified concrete hassignificant advantages comparing to traditional heavy concretes. The method for numerical analysis of stress-strain state is chosen.It takes into account physical nonlinearity using software complex LIRA-SAPR. The results of the calculation of stress-strain state of the reinforced concrete shafts of chimneys withparameterof height H = 250 m, 90 m are given. This calculation is provided with using of finite element method that most accurately reflects theoperation of these structures in terms of temperature and humidityexposure. The efficiency of the use of high-strength concretes is showed, using examples of the erection of the reinforced concrete shafts of chimneys, that are exposed to temperature and humidity drops.

Keywords

физическая нелинейность, Дымовые трубы железобетонные, расчетная модель, ЛИРА-САПÐ, Бетон высокопрочный, численные анализ, температурно-влажностные воздействия, напряженно-деформированное состояние

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citations
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!
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