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Friction piles behavior in soil base and piles settlement calculation

Vestnik MGSU 9/2018 Volume 13
  • Utkin Vladimir S. - Vologda State University (VSU) Doctor of Technical Scinces, Professor of Department of industrial and civil engineering, the honored worker of the higher school of the Russian Federation, Vologda State University (VSU), 15 Lenina st., Vologda, 160000, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 1125-1132

Subject: friction piles are calculated by the first and second group of limit states. The article describes a new method for friction pile design by the second group (by settlement) of limit state in relation to the pile foundations of buildings and structures in the urban area and in the design of extensions to existing buildings in which the value of settlement is limited or unacceptable. A new method of piles settlement calculation is different from existing method by the Building Code SP 24.13330.2011. The method is based on a new approach of the pile behavior in soil base, which is different from the existing regulations and science papers. Research objectives: the new method of pile settlement calculation is presented with the purpose of clarifying the calculation of pile bearing capacity unlike an existing method in the Building Code (SP 24.13330.2011). The basis of the design is a new idea of the pile behavior in the soil base, which differs from the existing approaches. Materials and methods: the method consists in the formation of the pile settlement only as a result of pile shortening from the compressive force by the deformation of the pile material. Results: the design equation is presented for calculation the pile settlement caused by the pile material deformation. The condition for determining the pile length is presented, which provides the pile settlement only due to the pile material deformation. Conclusion: such approach of the pile settlement calculation is necessary for the design of extensions to existing buildings, as well as new structures near existing buildings, in which the settlement value is already close to the ultimate value of settlement. The article presents the examples of pile settlement calculations obtained by various methods (including the method of the Building Code SP 24.13330.2011) for comparison of the results. The article can be used in the piles design and in the formation of new design standards for pile foundations of structures and machines.

DOI: 10.22227/1997-0935.2018.9.1125-1132

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Featuresof the stress-and-strain state of outer walls under the influence of variable temperatures

Vestnik MGSU 10/2013
  • Kremnev Vasiliy Anatol'evich - LLC "InformAviaKoM" Director General, LLC "InformAviaKoM", 2 Pionerskaya str., Korolev, Moscow Region, 141074, Russian Federation; +7 (495) 645-20-62; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Kuznetsov Vitaliy Sergeevich - Mytishchi Branch, Moscow State University of Civil Engineering (MGSU) Candidate of Technical Sciences, Professor, Department of Architectural and Construction Design, Mytishchi Branch, Moscow State University of Civil Engineering (MGSU), 50 Olimpiyskiy prospect, Mytishchi, Moscow Region, 141006, Russian Federation; +7 (495) 583-07-65; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Talyzova Yuliya Aleksandrovna - Moscow State University of Civil Engineering (MGSU) Assistant, Department of Architectural and Structural Design, Mytishchi Branch, Moscow State University of Civil Engineering (MGSU), 50 Olimpiyskiy prospect, Mytishchi, Moscow Region, 141006, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 52-59

The authors draw attention to possible problems in the process of construction and operation of monolithic frame buildings, construction of which is now widespread. It is known that cracks can often appear in the facade and side walls. The size of the cracks can exceed the allowable limits and repair does not lead to their complete elimination. Also cracks significantly mar the appearance of a building. Thus, the relevance of this study lies not only in fuller understanding of the operation of walls, but also in the ability to prevent undesirable effects.The authors calculated temperature effects for boundary walls of the building blocks made of heavy concrete. The original dimensions of the walls conformed to a grid of columns for the majority of residential and public buildings.The stress-and-strain state of the walls in case of temperature changes is observed in detail, including the transition from sub-zero to above-zero temperatures within the same section (wall). It was revealed that the temperature variations within the established limits may cause stress-and-strain state in the walls, in which the temperature tensile stresses can exceed the tensile strength of materials. The article contains effective means of reducing thermal strains, which can prevent temperature and shrinkage cracking.

DOI: 10.22227/1997-0935.2013.10.52-59

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