Abstract
Many liquid storage tanks around the world have been affected by earthquakes, and the seismic analysis of such tanks is much more complicated due to the Fluid-Structure Interaction. Besides, when the soil properties are taken into the consideration, the analysis with the Fluid-Soil-Structure Interaction becomes very complicated. In this paper, a series of shaking table tests are conducted on a model of the cylindrical water tank rested on dry granular soil and the equivalent load is considered to study the effect of hydrodynamic pressure generated in the storage water tank on the soil behavior. An experimental investigation of (1:100) scale model has been carried out on a shake table that was manufactured with specific mechanical parts and flexible laminar shear box. The preparation of the test included three cases in different relative densities (medium, dense, medium-dense). Three earthquake histories (Kobe, El-Centro and Ali Al-Gharbi) were implemented to study a wide range of the acceleration. The results showed that the acceleration at the bottom-depth of the soil column is slightly higher than at the mid-depth, while at the top portion of the soil column, the acceleration comparatively becomes less than that at the mid-depth. The settlement due to hydrodynamic pressure in the storage base tank is significantly reduced compared with results of nonhydrodynamic pressure in all cases of the acceleration history. In addition, the lateral stress at the surface gives higher than the stress at a depth equal to the diameter of the base tank.
Highlights
Cylindrical steel and reinforced concrete tanks are widely used as engineering structures to store water, fuel or the other liquids
The Flexible laminar shear box (FLSB) was installed on the table as it is shown in Figure 3 and to ensure a good limitation for the stress distribution of the footing to the box, Poulos and Davis [11], Steensen-Bach et al [12] and Agarwal and Rana [13] reported that the size of the stress bulb zone with respect to depth is (1.5-2) B below the model footing and 1.5B away from the model footing
A hydrodynamic pressure on the storage tank generated during the earthquakes was investigated to study its effect on the granular soil with different relative density
Summary
Cylindrical steel and reinforced concrete tanks are widely used as engineering structures to store water, fuel or the other liquids. The first tanks were connected to the earthquake simulator directly, and the second one was attached to the base of the scaled steel structure They found the final motion of dynamic pressure and water level contain the term that depends on the ground acceleration corresponding to oscillation time history and excellent matching was found by using little modes. These conclusions can be applied directly to the prototype subjected to the main support excitation. It was observed of non-linearity in structure when the impulsive pressure of the tank reduces with increasing acceleration and increases with further rocking
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