Abstract
In general, soil-structure interaction phenomena affect considerably the dynamic response of liquid-storage tanks. As it is also observed in the case of ordinary structures, the ground motion transmitted to the superstructure can be amplified (or even de-amplified) due to the presence of the underlying soil layer(s), modifying in parallel the resonant period and the effective damping of structures. Typically, fixed-base liquid storage tanks are characterized by low fundamental periods. However, many such critical structures are located in coastal areas with soft soils, thus, the seismic performance of the superstructure may be notably different compared to stiff soil conditions. Therefore, ignoring soil-structure interaction may lead to unrealistic results. Accordingly, the influence of soil conditions in the dynamic response of liquid-storage tanks is investigated in the present study. More specifically, the dynamic soil-structure interaction of cylindrical steel tanks subjected to different ground motions is numerically examined. The main aim is to investigate the dynamic response and the distress of squat and slender liquid-storage tanks for different foundation conditions. The finite-element models include suitable contact formulations to accurately model the soil-structure interaction for each type of fixity conditions (i.e., anchored and unanchored).
Highlights
The majority of ordinary structures are founded on one or more soil layers
The conventional design methods do not consider the impact of flexible foundation, resulting in conservative designs (Mylonakis and Gazetas, 2000; Anand and Kumar, 2018). These methods do not take into account the reduction of the seismic demand on the superstructure compared to the free-field motion that is due to kinematic interaction or damping phenomena at the foundation level (FEMA, 2005)
As it has been mentioned, the main purpose of the current study is to investigate the impact of dynamic soil–structure interaction (DSSI) on liquid-storage tanks, which requires the presence of a compliant foundation layer, as these phenomena are marginal in the case of stiff soil or rock
Summary
The majority of ordinary structures are founded on one or more soil layers. The effect of the dynamic soil–structure interaction (DSSI) depends on the mass and the stiffness of the superstructure, the stiffness of the soil, and the damping of the superstructure and the underlying soil (Kramer, 1996). The conventional design methods do not consider the impact of flexible foundation, resulting in conservative designs (Mylonakis and Gazetas, 2000; Anand and Kumar, 2018). These methods do not take into account the reduction of the seismic demand on the superstructure compared to the free-field motion that is due to kinematic interaction or damping phenomena at the foundation level (FEMA, 2005)
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