Determination of the region of the limiting states occurrence in RVS-20000 with the subsidence of the external bottom contour

P.V Chepur,A.A Gruchenkova,A.A Tarasenko,A.D Abramov,V Murgul

doi:10.1051/matecconf/201823906002

Abstract

The problem of the limiting states occurrence in the structures of a vertical steel tank is investigated in this work. To study the SSS of the metal structures of the object, the authors created a numerical model of the RVS-20000 tank in the ANSYS software complex. The model considers the maximum number of elements with their geometry and connections affecting the tank SSS under non-axisymmetric loading, including beyond the elasticity of steel. Dependences between the parameters of intrinsic stiffness of the VST are obtained. The results of the finite element analysis made it possible to develop a technique for assessing the technical condition of the structure with the development of irregular subsidence of the external bottom contour. The proposed technique can be used by both operating and design organizations in making managerial decisions regarding the repair of RVS-20000 subjected to the base subsidence.

Highlights

Calculation of the vertical steel tank (VST) structures should be performed according to the method of limiting states of the first and second groups in accordance with [1]
The emergence of limiting states of the second group in the VST structures is possible in this zone; repair is necessary to avoid further development of the level of stresses and deformations
The entry of the point of intersection of the straight S and the curve m into the third danger area indicates that in the tank there may be limiting states of both the I and II groups, the VST in this case is in emergency condition and immediate repair work is required

Summary

Introduction

Calculation of the vertical steel tank (VST) structures should be performed according to the method of limiting states of the first and second groups in accordance with [1]. The limiting states of the first group are checked by calculating the maximum loads and the effects possible in case of a violation of normal operation, and the limiting states of the second group are tested for loads corresponding to the normal operation of the structures Even though these basic documents consider the main loads (hydrostatic, snow, wind, weight of equipment, overpressure and vacuum, etc.), an idealized case is calculated, which does not reflect the geometric imperfections of the form during construction, deviation of the base marks from https://doi.org/10.10 51/matecconf /201823906002 the design due to possible defects of CIWs, etc. These factors, according to [4,5,6,7,8,9], affect the total SSS of the tank and, the occurrence of limit states

Methods

Results

Conclusion