A method for checking and calculating the stability of building foundations under earthquake action

Abstract

The invention belongs to the technical field of building structure design and particularly relates to a checking calculation method for the stability of a building foundation under the earthquake action. According to the method, at first, a general finite element program ANSYS is selected for setting up a three-dimensional space finite element model of a building, loading, calculating and deriving are carried out according to the mechanics principle to obtain a concentrated mass bar unit model with the identical dynamic characteristics, the obtained concentrated mass bar model is guided into an ACS SASSI program, a foundation model is supplemented and set up in the ACS SASSI program according to the factory site foundation condition, the ground motion time history is input, and a calculation kernel of the ACS SASSI program is utilized for achieving calculation functions such as soil-structure interaction (SSI) and foundation nonlinearity. By the adoption of the method, an analysis model can conform to actuality better, the calculation result is more accurate and reliable, and the method is simple, applicable, easy to operate, and convenient to realize in actual engineering.

Description

technical field [0001] The invention belongs to the technical field of building structure design, and in particular relates to a method for checking and calculating the stability of building foundations under earthquake action. Background technique [0002] The anti-slip and anti-overturning calculations in the stability analysis of building foundations under earthquakes generally do not involve the calculation of internal force and deformation of structural components. Therefore, traditional static calculation methods are generally used in structural design in the past, such as nuclear power plants. The zero-period acceleration of the floor response spectrum is calculated to obtain the seismic action of each floor, thereby obtaining the total slip force and overturning moment of the base. The advantage of this traditional calculation method is that it is easy to understand, the calculation is simple and clear, and it takes less time. It can meet the engineering design requi...

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Problems solved by technology

However, the disadvantage of this method is that the characteristics of the structural vibration mode are not considered in the calculation of the earthquake action, which often leads to the calculation results of the base slip force and overturning moment being too large, especially in the case of a nuclear power plant where the design earthquake is relatively large. The result will be too conservative or even fail to meet the safety factor requirements; in addition, the traditional static calculation method cannot consider the soil-structure interaction (SSI) and the nonlinear characteristics of the foundation, and the analysis model cannot fully reflect the actual force of the structure. low precision

[0003] In nuclear power engineering, with the popularization of standardized design of nuclear power plants, the peak acceleration of ground motion adopted to envelop multi-site conditions also increases, resulting in the calculation results of conservative traditional stability analysis methods may not meet the design requirements ; In addition, the complexity of the site conditions often requires that the SSI effect should be considered in the calculation and analysis

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