Calculation of a multistoried building on the intensive earthquake taking into account the possibility of foundation soil fluidifying

Vestnik MGSU

Mkrtychev Oleg Vartanovich¹  Busalova Marina Sergeevna¹ 

[1] Moscow State University of Civil Engineering (MGSU);

关键词: direct dynamic method;    explicit integration scheme;    Mor-Coulomb model;    soil fluidifying;    interaction with soil;    nonlinear soil properties;    intensive earthquake;    accelerogram;   

DOI  :  

来源: DOAJ

【 摘 要 】

In the article the problem of calculation of the multistoried building on soil with nonlinear properties is considered. As a foundation model the Mor-Coulomb model is applied. This model meets the following main requirements: it is capable to represent the mechanism of deformation of soil realistically; it contains parameters, which can be defined from standard laboratory researches; it has a sinmilarity and simplicity of use from the computing point of view. In the article the influence of fluidifying foundation soil at intensive seismic effect is investigated. In case of strong influences the behavior of soil becomes nonlinear, and the problem of assessing the response of soil becomes significantly complicated: the response depends as on the structure, power and water saturation of soil layers, and on magnitude and frequency structure of seismic influence. At such influences the rheological properties of soil, which is often connected with ground water movements, change. The changes of a phase condition of soil when soil is diluted are possible. As a result, seismic fluidifying of soil is usually accompanied by severe accidents even on aseismic constructions: buildings manage "to drown" or warp. There are even emissions of the diluted soil on a surface, which lead to formation of sandy craters. The catastrophic fluidifying of the water-saturated dusty and sand soil, which has caused victims and huge economic damage, happened at two strong earthquakes of 1964: on March 27 at a coast of Alaska near Anchorage with M = 8,4, and on June 16 in Niigata (Japan) with M = 7,5. Researches are conducted with the use of direct dynamic methods of calculation realizing obvious schemes of integration of the equations of movement.

【 授权许可】

Unknown