Sloshing effects in large liquid storage tanks during earthquakes are a critical design consideration, because excessive sloshing can lead to overtopping, roof damage, uplift of the tank shell, hydrodynamic pressure amplification, and even tank failure. Modern practice manages sloshing through a combination of theoretical modeling, structural detailing, and seismic design provisions.
When an earthquake occurs, the liquid in a large storage tank doesn't move as a single solid block. Instead, it splits into two distinct components: the impulsive mass (the bottom portion that moves rigidly with the tank walls) and the convective mass (the top portion that sloshes back and forth). This separation allows designers to:
Most design codes (ACI 350.3, API 650, Eurocode 8, IS 1893-Part 2) are based on this framework.
Managing these sloshing (convective) effects is critical to prevent "elephant foot" buckling, roof damage, or hazardous spills. Engineers use a combination of structural design, internal...