The research of seismic resistance of tank with linear-spectral method application

UDK: 624.042.7
DOI: 10.24887/0028-2448-2018-1-85-87
Key words: seismic stability, modal analysis, response spectrum, impact spectrum, stress-strain state, tank, aboveground storage tank, ANSYS
Authors: A.A. Tarasenko (Tyumen Industrial University, RF, Tyumen), P.V. Chepur (Tyumen Industrial University, RF, Tyumen), Guan Youhai (China University of Petroleum, China, Qingdao), A.A. Gruchenkova (Surgut Institute of Oil and Gas, RF, Surgut)

The work is devoted to the study of seismic resistance of the vertical steel tank RVS-20000 taking into account the response of the "foundation-tank-liquid" system, performed on the basis of the finite element method, modal analysis and linear-spectral theory. Calculations are performed for the tank model with a high degree of detailing of metal structures: walls, fixed roof, bottom, stiffening rings. To determine the external seismic effect, generalized broadband seismic response spectra were used.

The results of the calculation of the most representative natural oscillation frequencies of RVS-20000, completely filled up to the design mark, are presented. In total, 400 modes (frequencies of natural oscillations) were calculated.

The dependences of the maximum stresses in metal structures on the magnitude of oil loading in earthquakes with a magnitude of 7, 8, 9 points are obtained. Areas with maximum values of operating stresses in RVS-20000 metal structures are established; in all considered cases they are dislocated in zones 5-8 of the belt of the tank wall. In contrast to the previously considered RVSPK-50000 with a floating roof, where under seismic action the maximum stress level is at an altitude of 1–2 belts; in this work the tank with a fixed roof has other stiffness parameters. This confirms the assertion that in the calculation of stress-strain state in a non-axisymmetric setting, the simplification of geometry (by imposing a restriction on the degrees of freedom for elements of the upper edge of the wall) of the upper tank node is unacceptable.

References

1. Tarasenko A., Chepur P., Gruchenkova A., Study of deformations in a large-capacity oil storage tank in the presence of subgrade inhomogeneity zones, MATEC Web of Conferences, 2016, p. 01025.

2. Vasil'ev G.G., Tarasenko A.A., Chepur P.V., Yukhay Guan', Seismic analysis of vertical steel tanks RVSPK-50000 using a linear-spectral method (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2015, no. 10, pp. 120–123.

3. Youhai Guan, Tarasenko A.A., Sining Huang, Rulin Zhang, Shaking table test on failure mechanism of RC frame with exterior corridor, World Information on Earthquake Engineering, 2016, V. 32, no. 1, pp. 219–227, DOI: 10.6052/j.issn.1000-4750.2015.06.0473.

4. Belostotskiy A.M., Akimov P.A., Kaytukov T.B. et al., Finite element formulation and analysis of fluid – structure interaction problems (In Russ.), Stroitel'naya mekhanika i raschet sooruzheniy, 2014, no. 5 (256), pp. 21– 28.

5. Sinel'shchikov A.V., Panasenko N.N., Sinel'shchikova L.S., A mathematical model of the seismic response spectra for design basis of constructions with crane loads (In Russ.), Vestnik Astrakhanskogo gosudarstvennogo tekhnicheskogo universiteta, 2012, no. 1, pp. 66–74.    

The work is devoted to the study of seismic resistance of the vertical steel tank RVS-20000 taking into account the response of the "foundation-tank-liquid" system, performed on the basis of the finite element method, modal analysis and linear-spectral theory. Calculations are performed for the tank model with a high degree of detailing of metal structures: walls, fixed roof, bottom, stiffening rings. To determine the external seismic effect, generalized broadband seismic response spectra were used.

The results of the calculation of the most representative natural oscillation frequencies of RVS-20000, completely filled up to the design mark, are presented. In total, 400 modes (frequencies of natural oscillations) were calculated.

The dependences of the maximum stresses in metal structures on the magnitude of oil loading in earthquakes with a magnitude of 7, 8, 9 points are obtained. Areas with maximum values of operating stresses in RVS-20000 metal structures are established; in all considered cases they are dislocated in zones 5-8 of the belt of the tank wall. In contrast to the previously considered RVSPK-50000 with a floating roof, where under seismic action the maximum stress level is at an altitude of 1–2 belts; in this work the tank with a fixed roof has other stiffness parameters. This confirms the assertion that in the calculation of stress-strain state in a non-axisymmetric setting, the simplification of geometry (by imposing a restriction on the degrees of freedom for elements of the upper edge of the wall) of the upper tank node is unacceptable.

References

1. Tarasenko A., Chepur P., Gruchenkova A., Study of deformations in a large-capacity oil storage tank in the presence of subgrade inhomogeneity zones, MATEC Web of Conferences, 2016, p. 01025.

2. Vasil'ev G.G., Tarasenko A.A., Chepur P.V., Yukhay Guan', Seismic analysis of vertical steel tanks RVSPK-50000 using a linear-spectral method (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2015, no. 10, pp. 120–123.

3. Youhai Guan, Tarasenko A.A., Sining Huang, Rulin Zhang, Shaking table test on failure mechanism of RC frame with exterior corridor, World Information on Earthquake Engineering, 2016, V. 32, no. 1, pp. 219–227, DOI: 10.6052/j.issn.1000-4750.2015.06.0473.

4. Belostotskiy A.M., Akimov P.A., Kaytukov T.B. et al., Finite element formulation and analysis of fluid – structure interaction problems (In Russ.), Stroitel'naya mekhanika i raschet sooruzheniy, 2014, no. 5 (256), pp. 21– 28.

5. Sinel'shchikov A.V., Panasenko N.N., Sinel'shchikova L.S., A mathematical model of the seismic response spectra for design basis of constructions with crane loads (In Russ.), Vestnik Astrakhanskogo gosudarstvennogo tekhnicheskogo universiteta, 2012, no. 1, pp. 66–74.    



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