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Assessment of Steel Storage Tank Thickness Obtained from the API 650 Design Procedure Through Nonlinear Dynamic
Sobhan Fallah Daryavarsari1,2, Roberto Nascimbene2
1Department DICAr, University of Pavia, 27100 Pavia, Italy.
Materials (Basel, Switzerland)
|January 11, 2025
Summary
API 650 steel storage tank design is insufficient for seismic demands. Nonlinear dynamic analysis is crucial for accurate seismic resilience, especially in high-risk areas.
Area of Science:
- Structural Engineering
- Earthquake Engineering
- Mechanical Engineering
Background:
- Steel storage tanks are critical infrastructure in the oil and gas industry.
- Current design codes like API 650 may not fully capture seismic vulnerabilities.
- Assessing seismic performance is vital for ensuring operational integrity.
Purpose of the Study:
- To evaluate the adequacy of the API 650 design procedure for steel storage tanks under seismic loading.
- To investigate the seismic vulnerability of storage tanks using nonlinear dynamic analysis.
- To determine optimal tank thicknesses for enhanced seismic resilience.
Main Methods:
- Nonlinear dynamic analysis with large deformation effects.
- Case study of storage tanks in Naples, Italy, under site-specific seismic conditions.
- Nonlinear time-history simulations using SAP2000 with a target spectrum and 20 earthquake records.
Main Results:
- API 650 linear spectral analysis underestimates seismic demands, leading to insufficient tank thicknesses.
- Optimal thicknesses were determined through a trial-and-error process to ensure satisfactory performance.
- Elephant-foot buckling was observed in tanks with lower height-to-radius (H/R) ratios.
Conclusions:
- Linear spectral analysis in API 650 is inadequate for realistic seismic scenarios.
- Nonlinear time history analysis is essential for accurate seismic design of storage tanks.
- Integrating nonlinear analysis enhances seismic resilience in high-risk regions.
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