The violent dynamic behavior of liquid under horizontal excitation is a key factor that needs to be addressed in the seismic-resistant design of liquid tanks. Therefore, this study focuses on the slosh response of the liquid medium in a rectangular tank under Imperial Valley 1979, El Centro 1940 and Kobe 1995 ground motions of different frequency ranges. The ground motions records are selected based on the PGA/PGV ratio. For slosh control, a single vertical perforated baffle plate is used as an anti-slosh element with different configurations of perforations. Considering the free surface elevation as the major response parameter, the effect of percentage of perforation of the baffle plate, clear spacing of perforations and offset distance of the perforated plate are investigated by carrying out the pressure-based transient analysis using computational fluid dynamic (CFD). The optimum perforation varies from 10% to 17%, corresponding to the frequency of ground motion in the range of far-resonant to near-resonant conditions. Additionally, “rapid zone” ([Formula: see text]-zone) and “moderate zone” ([Formula: see text]-zone) are identified to pilot the positioning of the perforated baffle plate in liquid tanks. The perforated baffle plate with an optimum range of moderately spaced perforations positioned at the moderate zone of the tank effectively reduces the free surface elevation. Furthermore, the perforated baffle plate is more advantageous during violent sloshing under near-resonant conditions.
The quantification and damping of slosh responses are significant due to the increasing demand for safety of the liquid-based applications under severe external excitation. Recently, the solid or perforated baffle plates have been used to damp the slosh response of the liquid. However, there is uncertainty in the selection of an effective configuration of the baffle plates. Additionally, most of the studies reported the slosh response under surge excitation. Therefore, the present study focuses on the slosh response of the rectangular tank fitted with perforated baffle plates of different configurations under pitch excitation. For this, the liquid sloshing is simulated using the concepts of Computational Fluid Dynamics (CFD) using pressure-based solver in the time domain. A detailed parametric study is carried out to develop an effective configuration of the perforated baffle plates considering the area of perforations, inter perforation distance, size of perforations, distance between the perforated baffle plates, alignment of perforations, and the vertical position of perforated baffle plate as the parameters. The slosh responses are observed in terms of free surface elevation, hydrodynamic pressure, turbulence kinetic energy, velocity streamlines, power spectral density corresponding to the free surface elevation and the free surface deformation. The study developed a ‘zig-zag blocking alignment’ of perforations for effective slosh damping, with the solid area between the perforations being 50%-60% of the area of perforations. Additionally, ‘single-acting range’ and ‘damping range’ are identified to pilot the positioning of the multiple baffle plates in a rectangular tank under pitch excitation.
Today's tall building concept is rooted in architectural features of building geometry along with stiffness and lightness. Hence, architectural concept and structural concept must go hand in hand. Based on this many lateral load resistance systems have been developed. Tubular system is the latest technology in this area. Recently, the high rise building technology relies on this system. Diagrid is another latest invention in this area, which is a mutation of Tubular system. Diagrid is a better choice, where Tubular system failed to fulfil the requirements, especially in the case of complex geometries. In this paper the Diagrid and Tubular buildings are compared in order to study the structural efficiency of both type of buildings. For this purpose, comparison is made among different models of Diagrid building and respective models of Tubular building. 24, 30, 36, 42, 48, 54, 60, 66 storey models of both Diagrid and Tubular buildings are generated in ETABS2015 software and analysed. The loads are taken from IS: 875-1987. The earthquake load is applied as per 1893-2002. The analysis results are compared in terms of 'Displacement', 'Storey drift', 'Time period' and 'Storey shear'. The values of these parameters of Tubular building are found to be larger than that of Diagrid building under same loading condition. The comparison of analysis results revealed that the Diagrid building is structurally more efficient than the Tubular building.
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