PSI - Issue 6

R.V. Fedorenko et al. / Procedia Structural Integrity 6 (2017) 244–251 Fedorenko R. et al. / StructuralIntegrity Procedia 00 (2017) 000 – 000

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Regulatory documents [21] allow to take an admissible reinforcement work in the plasticity. It does not limit crack width (if there isn’t any leak of the nuclear fuel). So according to regulatory documents, for the strength insurance the crucial criterions are 4 and 6. 4.5. Strength analysis of the NPP structures Analysis of the stress-state calculation results of the NPP structures under the aircraft impact was performed on the basis of the formulated criterions for the strength and failure survival of reinforced concrete structures. The use of the parametric simulation model allowsdetermining the optimal value of the containment thickness and, on the whole, to investigate the effect of this parameter on the outcome of the aircraft impact. It wasascertained that the dynamic loads on the secondary systems located inside the reactor structure significantly depend on the position and height of the target points. The values of the accelerations can reach several tens of G. At the same time, the thicknessincrease of the outer containment does not have the determinate effect on the maximum values of the accelerograms. Thus, during the NPP structuresdesign, it is necessary to solve the problem reliability of secondary systems in concern with the solution of thegeneral structural strength problem. 4.6. Line of further research At the present time, structure analysis methods are being refined and differentiated in the following directions: Computational methods and mathematical material models verification in program systems ANSYS (Explicit Structural), ABAQUS and LS- DYNA. In particular, the possibility of using «Smoothed particle hydrodynamics»technology to simulat e aircraft failure during the impact is analysed along with the methods for fuel-air mixture treatment simulation. Effect of the soil mechanical-and-physical properties on the stress-strain state of the structure is under research. Besides numerical simulation of the coupled vibrations of the "construction-foundation" system, methods for simplified taking into account of the elastic and viscous soil characteristics are processed and studied. [3] LS-D YNA User’s Keyword Manual. Livermore Software Technology Corporation, http://www.lstc.com/download/manuals, 2016 . [4] ABAQUS Analysis User’s Manual, vol. III – Materials. Dassault Systems, http://www.3ds.com/support/documentation/users-guide, 2016. [5] ABAQUS Theory Guide. Dassault Systems, http://www.3ds.com/support/documentation/users-guide, 2016. [6] KachanovL.M. Introduction to Continuum Damage Mechanics, Nauka, Moscow, 1974. ( Основымеханикиразрушения ). [7] RabotnovY.N. On a mechanism of delayed failure , in book “Voprosy prochnosti materialov i construtsiy”, Izd. AN SSSR, 1959. ( Омеханизмедлительногоразрушения ). [8] Wolanski A.J. Flexural behavior of reinforced and prestressed concrete beams using finite element analysis. Marquette University, Milwaukee, 2004, 87 p. [9] Ken Watanabe et.al., Experimental Study on Stress-Strain Curve of Concrete Considering Localized Failure in Compression // Journal of Advanced Concrete Technology Vol.2, No. 3, 395-407. [10] CEB- FIP Model Code 1990. Comité Euro- International du Béton, 1993 . [11] B. Bresler, A.C. Scordelis Shear strength of reinforced concrete beams // J. Am. Concr. Inst., 60(1), 51-72, 1961. [12] F.J. Vecchio, W. Shim Experimental and Analytical Reexamination of Classic Concrete Beam Tests // Journal of Structural Enginnering, ASCE, March 2004. [13] Cervenka V. Inelastic Finite Element Analysis of Reinforced Concrete Panels. - University of Colorado : Boulder. – 1970. [14] Bing Li, Kazunori Fujikake Experimental Study of Reinforced Concrete Slabs under Different Loading Rates – Aci Structural Journal, 2016. [15] Bending failure of a shear reinforced concrete slab due to deformable missile impact. K. Calonius et al. SMiRT 21, New Delhi, India, 2011. [16] Extreme actions on stractures [Text]: A.N. Birbraer, A.Yu. Roleder.,Izd. SPbSTU, SPb, 2009, 594 p. [17] Riera J. D. On the Stress Analysis of Structures Subjected to Aircraft Impact Forces // Nucl. Engng. and Des. 1968. Vol. 8. P . 415−426 . [18] 720 Airplane Characteristics for Airport Planning. The Boeing company commercial airplane division. D6-58323. March 1969. [19] 747-400 Airplane Characteristics for Airport Planning. Boeing Commercial Airplanes. D6-58326-1. December 2002. [20]Airbus A380 Aircraft Characteristics, Airport And Maintenance Planning. – Airbus S.A.S. December 13. [21] Construction design rules of the nuclear power plants with different reactor types [Text]: PiNAE-5.6-86 / Minatomenergo RF, 1986. ( Нормы строительного проектирования атомных станций с реакторами различного типа ). References [1] Karpenko N.I. General mechanical models of reinforced concrete, Stroyizdat, Moscow, 1996, 416 p. [2] ANSYS Help. ANSYS, Inc., http://www.ansys.com/Support/Documentation, 2016.