Bases and foundations of buildings at reconstruction

21st International Scientific Conference on Advanced in Civil Engineering "Construction - The Formation of Living Environment"

土木建筑工程

Glushkov, Alexey^1 ; Glushko, Vyacheslav^1

Volga State University of Technology, Lenin Sq. B. 3, Yoshkar-Ola

424000, Russia^1

关键词: Deformation properties;    Deformed state;    Elasto-plastic;    Limit state;    Nonlinear state;    Stress strain state;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/365/4/042060/pdf
DOI  :  10.1088/1757-899X/365/4/042060

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

The problems of increasing the pressures on soils, compressed by the load from the exploited structures when superstructuring heighten additional floors with increasing the load without strengthening basis and foundations are considered. The successful experience of strengthening without reinforcing the foundations and artificial hardening of the soil shows that the pressure on the basis can be increased even for p>R. Despite the wide native experience of reconstruction, there are no regional or departmental norms or rules at design of the bases and the foundations of the reconstructed buildings nowadays. To determine the reserves of the bearing capacity of the soils, due to the underestimated requirements of the norms, it seems reasonable to analyse the previously used methods for designing the bases and use modern nonlinear state models in the calculations. For this, it is necessary to reliably and correctly determine the physic-mechanical and deformation properties of the undisturbed structure in the substrate. Calculation for two limit states in that case can be reduced to the common calculation allowing to define the stress-strain state at any settlement and, on the contrary, the deformed state at any loadings up to destroying. The use of the numerical modelling with the application of elasto-plastic tasks at the reconstruction of buildings and constructions excludes the need of extremely laborious works on artificial hardening of soil in the basis and the strengthening of the existing foundations.