Сравнение двух основных методов анализа сейсмостойкости оборудования на примере вентиляционного агрегата
The paper considers a computational analysis of the NPP’s light equipment seismic resistance on the example of a ventilation unit, using two most common techniques: linear spectral analysis and direct dynamic analysis method.
The basic provisions, assumptions and limitations of the linear spectral method are presented. Examples of computational cases are provided where the method in question is not applicable in a generally accepted formulation. In particular, an analysis of extended spatial structures shall take into account the phase difference and, possibly, the accelerations/displacements for mutually remote boundary conditions. Another example is reservoirs with a liquid which are not filled up. Here, liquid waves can form and they cannot be taken into account in the linear spectral method.
The paper considers the peculiarities involved in the use of the dynamic analysis method, including the required input data, and the approaches to and procedures for synthesizing the calculated accelerograms. A sequence of operations is presented for synthesizing the calculated accelerograms, and materials are listed which describe the mathematical apparatus used in the derivation of finite mathematical relations for the calculation of response spectra and calculated relations as such. The essence of the damping coefficient, its effects on the calculation results and the approaches to its determination are described. Variants with the absolute absence of damping and with absolute damping are discussed.
A real radial ventilation set used in active ventilation systems of nuclear power plants was taken as the test model. The calculation results for the detailed finite-element model of the ventilation unit developed using the Zenit-95 software package are presented. These include the distribution of the calculated reduced stresses obtained by the linear spectral method and by the direct dynamic analysis method. An analysis of the results obtained by the two methods has shown that the linear spectral method overstates the calculated reduced stresses as compared to the dynamic analysis method, that is, underestimates the equipment’s resistance to seismic effects. In addition, the dynamic method shows additional areas of the ventilation unit where significant reduced stresses take place, while the linear spectral method leaves these areas unattended.
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