title: Ð¥Ð°ÑÐ°ÐºÑÐµÑÐ¸ÑÑÐ¸ÐºÐ¸ Ð½Ð°Ð¿ÑÑÐ¶ÐµÐ½Ð½Ð¾-Ð´ÐµÑÐ¾ÑÐ¼Ð¸ÑÐ¾Ð²Ð°Ð½Ð½Ð¾Ð³Ð¾ ÑÐ¾ÑÑÐ¾ÑÐ½Ð¸Ñ Ð¾Ð±Ð¾Ð»Ð¾ÑÐºÐ¸ Ð³ÑÐ°Ð´Ð¸ÑÐ½Ð¸ Ð²ÑÑÐ¾ÑÐ¾Ð¹ 150 Ð¼ Ð¸Ð· ÑÐ¾Ð²ÑÐµÐ¼ÐµÐ½Ð½ÑÑ Ð²ÑÑÐ¾ÐºÐ¾Ð¿ÑÐ¾ÑÐ½ÑÑ Ð±ÐµÑÐ¾Ð½Ð¾Ð²
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° ÑÐ¿ÐµÑÐ¸Ð°Ð»Ð¸ÑÑÐ°
titleType: Subtitle
title: Characteristics of the strain-stress distribution of the cooling tower shell of a 150 m high from modern high-strength concrete
Creators: name: ÐÑÐ»Ð¸Ð±Ð°Ð±Ð°, ÐÐ»Ð¸Ð½Ð°
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2022
Subjects: Ð¾Ð±Ð¾Ð»Ð¾ÑÐºÐ° Ð³ÑÐ°Ð´Ð¸ÑÐ½Ð¸
Ð²ÑÑÐ¾ÐºÐ¾Ð¿ÑÐ¾ÑÐ½ÑÐ¹ Ð±ÐµÑÐ¾Ð½
ÑÐµÐ¼Ð¿ÐµÑÐ°ÑÑÑÐ½Ð¾-Ð²Ð»Ð°Ð¶Ð½Ð¾ÑÑÐ½ÑÐµ Ð³ÑÐ°Ð´Ð¸ÐµÐ½ÑÑ
ÑÑÐ¸Ð»Ð¸Ñ
Ð´ÐµÑÐ¾ÑÐ¼Ð°ÑÐ¸Ð¸
Ð½Ð°Ð¿ÑÑÐ¶ÐµÐ½Ð¸Ñ
ÑÐµÐ»Ð°ÐºÑÐ°ÑÐ¸Ñ
ÑÑÑÐµÐºÑÐ¸Ð²Ð½Ð¾ÑÑÑ
cooling tower shell
high-strength concrete
temperature and humidity gradient
inter-nal forces
deformation
tension
relaxation
effectiveness

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description: The subject of the graduate qualification work is "Characteristics of the strain-stress distribution of the cooling tower shell of a 150 m high from modern high-strength concrete".The work is devoted to the study of the characteristics of the stress-strain state of the cooling tower shell with a height of 150 m made of modern high-strength concrete, as well as the evaluation of the effectiveness of the use of highly efficient modified concrete for its construction based on the analysis of calculation results using modern software packages and calculation methods.Tasks that were solved during the study:1. Analysis of the influence of temperature and humidity effects on the strain-stress distribution of statistically indeterminate railway structures of buildings and structures.2. Study and generalization of the effect of temperature exposure on the characteristics of the properties of modern modified high-strength concrete.3. Analysis of methods calculating characteristics of the strain-stress distribution of reinforced concrete structural elements with uneven heating and humidification.4. Calculation of models of cooling towers made of concrete B30 and B80 under the action of force factors in the SCAD software package.5. Calculation of the temperature and humidity distribution over the thickness of the design elements.6. Determination of the strain-stress distribution characteristics of the w/w elements of cooling towers under temperature and humidity influences according to engineering (according to ACoP 27.13330.2017) and machine-oriented (based on a nonlinear deformation model) calculation methods.7. Evaluation of the effectiveness of the use of high-strength concrete in the construction of cooling towers.From the results of the analysis of experimental data on the effect of increased temperatures on the properties of high-strength concrete, it follows that short-term heating in the temperature range up to 200Â°C leads to a decrease in the strength of high-strength concrete in comparison with the strength at normal temperature by no more than 10% (for ordinary heavy concrete, a decrease in 25-27%), prolonged heating - to its almost complete restoration and a certain increase to 14%.Domestic normative methods for calculating reinforced concrete structures for temperature effects are presented in ACoP 27.13330.2017 and contain the main provisions of the engineering methodology and principles of constructing a methodology based on a nonlinear deformation model. The engineering methodology is simplified and contains a number of limitations. Calculations are performed only for two temperature conditions (the first short-term and long-term heating) and apply to concrete of classes no higher than B60.Calculations are performed on the basis of a nonlinear deformation model taking into account the physical nonlinearity of concrete deformation under the combined action of force and temperature-humidity factors, which makes it possible to obtain a more complete assessment of the stress-strain state of complex structures, taking into account the heterogeneity of the properties of concrete and reinforcement caused by uneven heating and cracking in concrete, taking into account the physical nonlinearity de-forming, shrinkage and creep of concrete.The results of calculations based on engineering methodology and on the deformation model for the effect of power and temperature-humidity factors in summer and winter modes of operation of the cooling tower confirm the effectiveness of the use of high-strength concrete due to a decrease in the thickness of the shell, a decrease in temperature moments, a decrease in the weight of the structure.