SeismoTank v5.0

SeismoTank

 

SeismoTank v5.0 is a specialized software tool for the seismic analysis and design of liquid storage tanks, developed by Seismosoft—creators of the renowned SeismoStruct structural analysis software. Version 5.0 represents a significant advancement in the specialized field of tank seismicity, providing engineers with a dedicated, user-friendly platform that implements the most current analytical methods and code requirements for liquid storage vessels. The software addresses the unique challenges of tank analysis: fluid-structure interaction, sloshing effects, impulsive and convective pressure distributions, and the complex behavior of tank shells and foundations under seismic loading. Whether designing new tanks or assessing existing ones for seismic vulnerability, SeismoTank v5.0 delivers the precision, code-compliance, and engineering insight that critical infrastructure demands.

 

🏗️ Primary Users

This specialized seismic engineering software is designed for:

• Structural Engineers & Seismic Specialists analyzing and designing liquid storage tanks for earthquake resistance.

• Civil Engineering Consultants performing seismic vulnerability assessments for industrial and municipal tanks.

• Oil & Gas Engineers designing storage tanks for refineries, terminals, and pipeline facilities.

• Water & Wastewater Engineers evaluating seismic safety of water storage tanks and treatment plant vessels.

• Regulatory & Safety Authorities reviewing tank designs for compliance with seismic codes and standards.

 

 

⚡ Key Features & Capabilities

💧 Advanced Fluid-Structure Interaction

Hydrodynamic Pressure Modeling:

• Accurate calculation of impulsive pressures (tank and fluid moving together)

• Convective (sloshing) pressures from fluid surface oscillation

• Flexible and rigid tank wall assumptions

• Pressure distribution along wall height and circumference

Sloshing Analysis:

• Fundamental sloshing mode characteristics

• Higher mode effects when significant

• Sloshing wave height calculation

• Freeboard requirements for overturning prevention

Added Mass Effects:

• Fluid participation in dynamic response

• Effective mass distribution for impulsive and convective components

• Mass participation factors for modal analysis

📐 Comprehensive Tank Types

Supported Tank Geometries:

• Circular Tanks: Above-ground, underground, elevated

• Rectangular Tanks: All aspect ratios

• Anchored and Unanchored: Base fixity options

• Flexible and Rigid Walls: Material-dependent behavior

Support Conditions:

• Ground-supported (slab or ring foundation)

• Elevated (column or pedestal supported)

• Buried (soil-structure interaction considerations)

• Flexible base conditions (for unanchored tanks)

⚡ Seismic Analysis Methods

Equivalent Lateral Force:

• Simplified method for regular tanks

• Base shear and overturning moment calculation

• Vertical distribution of seismic forces

Response Spectrum Analysis:

• Multi-modal analysis including sloshing modes

• Combination of impulsive and convective responses

• CQC and SRSS modal combination rules

• User-defined or code-specified spectra

Time History Analysis:

• Direct integration of equations of motion

• Fluid-structure interaction in time domain

• Support for real and artificial accelerograms

• Nonlinear behavior when applicable

📊 Code Compliance & Standards

International Seismic Codes:

• Eurocode 8 (EN 1998-4: Silos, tanks and pipelines)

• ACI 350.3 (Seismic Design of Liquid-Containing Concrete Structures)

• API 650 (Welded Steel Tanks for Oil Storage) Annex E

• AWWA D100 (Welded Steel Tanks for Water Storage)

• IS 1893 (Indian seismic code) for tanks

• NZSEE (New Zealand) guidelines

• Customizable parameters for other national codes

Design Checks:

• Shell stability and buckling verification

• Anchor bolt and base plate design

• Overturning stability (with or without anchors)

• Sliding resistance

• Foundation pressure checks

• Freeboard adequacy for sloshing

🏗️ Structural Modeling

Tank Shell Modeling:

• Membrane and bending behavior

• Circumferential and meridional stresses

• Plastic hinging and failure mechanisms

• Stiffener and ring girder effects

Foundation Interaction:

• Soil-structure interaction for flexible bases

• Uplift analysis for unanchored tanks

• Bearing pressure distribution

• Settlement effects

Roof Systems:

• Fixed and floating roofs

• Roof mass participation

• Pressure effects on roof structure

📈 Results Visualization & Reporting

Graphical Output:

• Pressure distribution plots (impulsive/convective)

• Mode shape visualization for sloshing modes

• Displacement and stress contours

• Time history response plots

Numerical Results:

• Base shear and overturning moment

• Hydrodynamic pressure coefficients

• Sloshing wave height

• Anchor tension forces

• Shell stresses and stability checks

Report Generation:

• Comprehensive calculation reports

• Code compliance summaries

• Design check documentation

• Export to PDF and Excel

🔧 Advanced Analysis Features

Parametric Studies:

• Variation of tank dimensions and proportions

• Liquid level effects (partial filling)

• Soil condition sensitivity

• Anchor configuration optimization

Nonlinear Analysis:

• Material nonlinearity (concrete cracking, steel yielding)

• Geometric nonlinearity (large displacements)

• Base uplift with gap elements

• Foundation nonlinear behavior

Probabilistic Assessment:

• Seismic hazard integration

• Fragility curve development

• Risk-based design options