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Cylindrical and rectangular-shaped tanks have a concentration of stagnant impulsive liquid at the bottom corners that do not participate in sloshing. While used as tuned liquid dampers (TLDs), this non-participating fluid adds extra liquid mass to the tank but does not have any role in the vibration control aspect. In the present study, to decrease the stagnant impulsive liquid, a chamfered bottom-shaped tank with a submerged internal object is demonstrated. Due to the high-energy velocity pulse present in near-fault earthquakes, there is a possibility of violent liquid sloshing which may cause unwanted structural damage to the tank. Hence, the present study focuses on the influence of near- and far-fault earthquakes on the non-linear seismic behavior of the tank with submerged internal object. The non-linear sloshing is modeled using the finite element method based on a combined Eulerian-Lagrangian approach. The accuracy of the present non-linear numerical model is checked by verifying the results with the previously published results. In addition to the absolute response, the dynamic convective and impulsive response components are quantified. The proposed non-linear finite element scheme can be utilized in the context of structure-mounted chamfer bottom TLDs in the future. • The effect of near- and far-fault earthquakes on the non-linear seismic response of the tank-object system is studied. • The non-linear sloshing is modeled using the finite element method based on a combined Eulerian-Lagrangian approach. • In addition to the absolute response, the dynamic convective and impulsive response components are quantified. • The proposed non-linear finite element model can be used in tuning and designing chamfer bottom TLDs. [ABSTRACT FROM AUTHOR]

The present study deals with the investigation of the non-linear slosh dynamics of a sloped wall tank with bottom-mounted object under seismic excitation. The potential flow theory has been adopted for modeling the liquid domain with a mixed Eulerian-Lagrangian method. The nonlinear seismic response of a sloped wall tank with bottom-mounted rigid internal object is suitably investigated under six different earthquakes. The selected earthquakes are classified based on their PGA/PGV ratios. The base shear force and hydrodynamic pressure are successfully quantified along with the impulsive and convective components. In order to study the influence of the internal object on the hydrodynamic behavior of the liquid tank, a parametric investigation is performed by altering the object's height. The necessity of non-linear analysis is reasonably justified by comparison of the results with those obtained from linear analysis, where a significant difference is observed between the linear and non-linear hydrodynamic responses. The developed non-linear finite element model in the current study is found to be more effective than the linear model and may be employed in designing structure-coupled sloped wall TLDs. [ABSTRACT FROM AUTHOR]

The non-linear seismic behavior of a ground-supported sloped wall tank is analyzed in the present study using a finite element model. A combination of three-node triangular and four-node quadrilateral finite elements is used to discretize the liquid domain. The velocity potential formulation is adopted for the liquid domain with a mixed Eulerian-Lagrangian scheme. By comparing the current numerical results with the existing experimental results, the competency of the present non-linear model is verified. The fundamental sloshing frequencies obtained from the present non-linear model are found closer to the experimental results compared to the linear counterpart. Non-linear seismic characteristics of liquid sloshing inside a ground-supported sloped wall tank are investigated under six different earthquakes categorized as low-, intermediate-, and high-frequency contents. Also, the dynamic impulsive and convective response components of hydrodynamic base shear force and pressure are quantified successfully. The comparison of the non-linear hydrodynamic response with the linear counterpart shows a significant difference in results which reasonably clarifies the limited capabilities of the linear model for response prediction as well as designing sloped wall tanks subjected to seismic excitation. The developed non-linear numerical model in the present study can be utilized for tuning and designing structure-coupled sloped wall TLDs. • Due to the improved sloshing characteristics, the sloped wall TLD becomes a more efficient vibration reducer. • The non-linear fundamental sloshing frequency is found closer to the published experimental results. • Non-linear model is found to be more accurate for response prediction of seismically excited sloped wall tanks. • The proposed model in the present study can be utilized for tuning and designing structure-coupled sloped wall TLDs. [ABSTRACT FROM AUTHOR]