Seismic design and evaluation guidelines for the Department of Energy high-level waste storage tanks and appurtenances

Bandyopadhyay, K.; Cornell, A.; Costantino, C.; Kennedy, R.; Miller, C.; Veletsos, A.

doi:10.2172/10143341

Cited by 6 publications

(11 citation statements)

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“…Shown in Table 1-2 and Fig. [5][6][7][8][9][10][11] the ANSYS results are overpredicted by less than 15 percent compared to their theoretical counterparts, the degree of overprediction being almost identical to that ofthe impulsive component of response referred to earlier.…”

Section: Fluid-structure Interaction Analyses Of Primary Tanksmentioning

confidence: 90%

HANFORD DOUBLE SHELL TANK (DST) THERMAL & SEISMIC PROJECT BUCKLING EVALUATION METHODS & RESULTS FOR THE PRIMARY TANKS

Mackey¹

2007

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This revision is to include the independent reviewer comments shown in Appendix D. Summary and in Sections 5.6, 6.3, 6.4.1, 6.4.3,7.1, 7.2, and 8.0 of this report. ;;1. Revisions to the buckling analyses in response to the review comments are contained in this Executive Approved For Public ReleaseA-6002-767 (REV 1) Tank Farm Contractor (TFC)(1) Document Number: RPP-RPT-28967 Page I RECORD OF REVISION Executive SummaryThis report documents a detailed buckling evaluation ofthe primary tanks in the Hanford double-shell waste tanks (DSTs), which is part of a comprehensive structural review for the Double-Shell Tank Integrity Project. This work also provides information on tank integrity that specifically responds to concerns raised by the Office ofEnvirornnent, Safety, and Health (ES&H) Oversight (EH-22) during a review of work performed on the double-shell tank farms and the operation ofthe aging waste facility (AWF) primary tank ventilation system.The current buckling review focuses on the following tasks:• Evaluate the potential for progressive I-bolt failure and the appropriateness ofthe safety factors that were used for evaluating local and global buckling. The analysis will specifically answer the following questions: Can the EH-22 scenario develop ifthe vacuum is limited to -6.6-inch water gage (w.g.) by a relief valve? What is the appropriate factor of safety required to protect against buckling ifthe EH-22 scenario can develop? What is the appropriate factor of safety required to protect against buckling ifthe EH-22 scenario cannot develop?• Develop influence functions to estimate the axial stresses in the primary tanks for all reasonable combinations oftank loads, based on detailed finite element analysis. The analysis must account for the variation in design details and operating conditions between the different DSTs. The analysis must also address the imperfection sensitivity ofthe primary tank to buckling.• Perform a detailed buckling analysis to determine the maximum allowable differential pressure for each ofthe DST primary tanks at the current specified limits on waste temperature, height, and specific gravity.Based on the I-bolt loads analysis and the small deformations that are predicted at the unfactored limits on vacuum and axial loads, it is very unlikely that the EH-22 scenario (i.e., progressive I-bolt failure leading to global buckling ofthe tank under increased vacuum) could occur.Based on the buckling analysis contained in this report, the current limits on the maximum vacuum level of 6-inch w.g. for the AY, AZ, SY, AN, and AW tanks and 12-inch w.g. for the AP tanks are acceptable given the current lack of corrosion in the tanks and the expectation that the maximum waste temperature will not exceed 250°F. These limits are predicated on maintaining the minimum allowable waste level at 6 inches for the AY, AZ, SY, AN, and AW tanks and 12 inches for the AP tanks to preclude bottom uplift from occurring. For this analysis, the occurrence of maximum tank vacuum was classified as a s...

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Section: Fluid-structure Interaction Analyses Of Primary Tanksmentioning

confidence: 90%

HANFORD DOUBLE SHELL TANK (DST) THERMAL & SEISMIC PROJECT BUCKLING EVALUATION METHODS & RESULTS FOR THE PRIMARY TANKS

Mackey¹

2007

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“…Where: E m , and  m are the modulus of elasticity and Poisson's ratio of bulk solid, respectively. To define shear modulus G i given in matrix (1) an empirical relationship between shear stresses  s and relative displacement s at the contact zone should be obtained experimentally from direct shear apparatus tests. On the above basis, the following formula has been used: where: n experimental parameters, L displacement modulus [mm],  the coefficient of friction of bulk solid at the contact surface,  n stress in normal direction to the contact surface,  s,max maximum value of shear stress.…”

Section: Response the Cylindrical Elevated Wheat Storage Silos To Seimentioning

confidence: 99%

Response the Cylindrical Elevated Wheat Storage Silos to Seismic Loading

Abd-el-rahim¹

2014

IOSRJEN

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The elevated cylindrical storage silos are lifeline structures and strategically very important, since they have vital use in industries. Silos are special structures subjected to many different unconventional loading conditions, which result in unusual failure modes. In addition silos are cantilever structures with the material stacked up very high vertically. The earthquake response of silo structures for the storage of bulk solids differs for elevated silos and silos supported directly on the ground. The walls of different type of silos are subject to earthquake loads from the stored mass, and these may substantially exceed the pressures from filling and discharge. The assessment of horizontal action of ensiled material due to seismic vent seems to be particular interest. This paper is concerned with the earthquake response of these structures, which has received little attention to date. A cylindrical silo wall and bulk solid is modeled by three dimensional finite solid l elements. The interaction effect between the silo wall and bulk solid is taking account by using the nonlinear approach proposed by Duncan and Chang. A then interface layer proposed by Desia is applied to describe the phenomena taking place on the surface between the granular material and silo wall. Coulomb's friction low was used for modeling of wall friction. An incremental iterative finite element technique is applied for dynamic analysis of wheat silos using SAP2000 structural software package. In this research seven reinforced concrete silo models with different height to diameter ratios were studied and analyzed in time history by using earthquake acceleration 0.5g applied to silos models. The resulting finite element silo pressures as the silo is full with and without earthquake excitation are compared with theoretical filling and discharging pressure. The result obtained revealed that the elevated silos response is highly influenced by the earthquake characteristics and is depending on the height to diameter ratio. Also the findings indicate that the squat silo (large diameter and height) are more resistance to the earthquake and more economical. The seismic responses of the elevated wheat silo such as top displacement, normal forces, shearing forces and bending moments in silo support have been assessed for earthquake records.

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“…The strength at an "elephant's foot" failure at the boundary condition is somewhat lower than internal failures at local imperfections, but much more work is needed to establish a less conservative evaluation. The standard has adopted the approximate relationship Methods of dealing with this type of failure (ECCS, 1988 [6], Bandyopadhyay et al, 1995 [1]) involve complicated iterative calculations with no better foundation in rational mechanics. Where the shell is subjected to global bending, the ductility of this failure mode permits higher stresses to be achieved.…”

Section: Cylinders Under High Internal Pressure: Elephant's Footmentioning

confidence: 99%

Response of Cylindrical Elevated Wheat Storage Silos to Seismic Loading

el-Rahim

Hamdy²

2013

JES. Journal of Engineering Sciences

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The elevated cylindrical storage silos are lifeline structures and strategically very important, since they have vital use in industries. Silos are special structures subjected to many different unconventional loading conditions, which result in unusual failure modes. In addition silos are cantilever structures with the material stacked up very high vertically. The earthquake response of silo structures for the storage of bulk solids differs for elevated silos and silos supported directly on the ground. The walls of different type of silos are subject to earthquake loads from the stored mass, and these may substantially exceed the pressures from filling and discharge. The assessment of horizontal action of ensiled material due to seismic vent seems to be particular interest. This paper is concerned with the earthquake response of these structures, which has received little attention to date. A cylindrical silo wall and bulk solid is modeled by three dimensional finite solid elements. The interaction effect between the silo wall and bulk solid is taking account by using the nonlinear approach proposed by Duncan and Chang [5]. A then interface layer proposed by Desia [4] is applied to describe the phenomena taking place on the surface between the granular material and silo wall. Coulomb's friction low was used for modeling of wall friction. An incremental iterative finite element technique is applied for dynamic analysis of wheat silos using SAP2000 structural software package [3]. In this research seven reinforced concrete silo models with different height to diameter ratios were studied and analyzed in time history by using earthquake acceleration 0.5g applied to silos models. The resulting finite element silo pressures as the silo is full with and without earthquake excitation are compared with theoretical filling and discharging pressure. The result obtained revealed that the elevated silos response is highly influenced by the earthquake characteristics and is depending on the height to diameter ratio. Also the findings indicate that the squat silos (large diameter to height ratio) are more resistance to the earthquake and more economical. The seismic responses of the elevated wheat silo such as top displacement, normal forces, shearing forces and bending moments in silo support have been assessed for earthquake records.

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Seismic design and evaluation guidelines for the Department of Energy high-level waste storage tanks and appurtenances

Cited by 6 publications

References 0 publications

HANFORD DOUBLE SHELL TANK (DST) THERMAL & SEISMIC PROJECT BUCKLING EVALUATION METHODS & RESULTS FOR THE PRIMARY TANKS

HANFORD DOUBLE SHELL TANK (DST) THERMAL & SEISMIC PROJECT BUCKLING EVALUATION METHODS & RESULTS FOR THE PRIMARY TANKS

Response the Cylindrical Elevated Wheat Storage Silos to Seismic Loading

Response of Cylindrical Elevated Wheat Storage Silos to Seismic Loading

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