title: Ð¢ÑÐµÑÐ¸Ð½Ð¾ÑÑÐ¾Ð¹ÐºÐ¾ÑÑÑ ÑÐ¾Ð½ÐºÐ¾ÑÑÐµÐ½Ð½ÑÑ ÐºÐ¾Ð½ÑÑÑÑÐºÑÐ¸Ð¹ Ð¿ÑÐ¸ ÑÐµÐ¼Ð¿ÐµÑÐ°ÑÑÑÐ½Ð¾-Ð²Ð»Ð°Ð¶Ð½Ð¾ÑÑÐ½ÑÑ Ð²Ð¾Ð·Ð´ÐµÐ¹ÑÑÐ²Ð¸ÑÑ
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð¼Ð°Ð³Ð¸ÑÑÑÐ°
titleType: Subtitle
title: Crack resistance of thin-walled structures under temperature-humidity effects
Creators: name: ÐÐµÐ»ÐºÐ¸Ð½Ð°, Ð¢Ð°ÑÑÑ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: 2020
Subjects: Ð¶ÐµÐ»ÐµÐ·Ð¾Ð±ÐµÑÐ¾Ð½
ÑÑÐµÑÐ¸Ð½Ð¾ÑÑÐ¾Ð¹ÐºÐ¾ÑÑÑ
ÑÐµÑÐ¼Ð¾Ð½Ð°Ð¿ÑÑÐ¶ÐµÐ½Ð½Ð¾Ðµ ÑÐ¾ÑÑÐ¾ÑÐ½Ð¸Ðµ
ÑÐµÐ¼Ð¿ÐµÑÐ°ÑÑÑÐ½ÑÐµ Ð²Ð¾Ð·Ð´ÐµÐ¹ÑÑÐ²Ð¸Ñ
Ð¿ÑÐ¾ÑÐ½Ð¾ÑÑÑ Ð´ÐµÑÐ¾ÑÐ¼Ð°ÑÐ¸Ð¸
ÑÑÐ°Ð´ÐºÐ°
reinforced concrete
crack resistance
thermal stress-strain state
thermal forces
strength
deformations
shrinkage

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description: The research set the following goals:
1. To analyze the possible causes of cracking in thin-walled structures of specific construction objects;
2. Investigate the thermal stress state of these structures on the calculation models;
3. To identify the main danger of cracking based on a comparison of actual and calculated data on cracking, and also to identify the causes of cracking;
4. To develop the necessary measures to combat crack formation.
The indicated tasks were solved within the framework of the work under the SPbPU contract with the construction organization. The nature of the crack formation, the location of the cracks, their depth and width of the opening, established as a result of examination of the structures, were compared with the results of calculations of the thermally stressed state. The analysis of temperature effects and the mechanism of crack development was carried out using the TERM (linear statement), TERMfea (two-dimensional statement) software packages developed at the Department of Building Structures and Materials of St. Petersburg Polytechnic University and the ANSYS spatial element modeling complex.
As a result of the calculations, it was found that the nature of the crack formation obtained on the calculation models is similar to that which took place in the structures. Consequently, the conditions of concrete hardening specified in the calculations (change in concrete temperature, tight bonds, restraining temperature-shrinkage deformations) coincide with the real ones. It has been established that the most dangerous temperature regime is the cooling of a thin-walled structure after reaching the maximum temperature, when tensile stresses arise in the zone of hard contact with the base, limiting free deformation of shrinkage and thermal compression. In contrast to the process of self-heating of concrete during cooling, both of these deformations have the same sign.
Recommendations have been developed to combat cracking, which will improve the quality of monolithic concrete and significantly increase the durability of structures.