Author : Ganesh S.S.Y 1
Date of Publication :7th December 2016
Abstract: Sloshing has been one of the major concerns in the design of liquid storage tanks, particularly under seismic excitation. There are evidences of failures of liquid storage tanks due to sloshing, during the past earthquakes. The consequential increase in the hydrodynamic forces on the tank walls depend on a variety of factors such as geometry of the tank, height of liquid in the tank , fluid tank interaction etc.,. Added to these, the presence of an internal obstruction in the form of protruded columns or a shaft in to the tank structure will make the sloshing behavior all the more complicated. This paper presents the results from an experimental study conducted on elevated rectangular tank models, on a mini shake table , simulating the seismic excitation . Sloshing heights and sloshing patterns are recorded from the experiments and their variation was studied by varying parameters such as tank capacity, spacing of bracings, water level in the tank and the amplitudes of vibration. All the studies were made with and without the presence of internal obstruction. Results obtained were compared with those obtained theoretically from the relevant code and also with those obtained from a software tool SaE Ca net. It is observed that the experimental results are in close agreement with the theoretical ones.
- ACI 350.3-06. (2006). “Seismic Design of Liquid-Containing Concrete Structures (ACI 350.3-06) and Commentary (350.3R-06).” American Concrete Institute (ACI) Committee 350, Environmental Engineering Concrete Structures, Farmington Hills, Mich.
- Draft IS: 1893 (Part-II, Liquid Retaining Tanks) Criteria for Earthquake Resistant Design of Structures,Bureau of Indian standards, New Delhi, India
- G.W. Housner (1963). “The behaviour of inverted Pendulum Structures during Earthquake”. Bulleting of the Seismological Society of America, Vol. 53 (2), Pp. 403-417.
- IITK-GSDMA . Guidelines for Seismic Design of Liquid Storage Tanks.
- Livaoglu, R. (2008). Investigation of seismic behaviour of fluid-rectangular tank-soil/foundation systems in frequency domain, Soil Dynamics and Earthquake Engineering, Vol.28 (2), Pp-132-146.
- Praveen.K.Molhotra (2006). “Earthquake induced sloshing in the tanks with insufficient freeboard”, Structural Engineering International paper, Vol.25 (6) Pp.56-86
- Sekhar Chandra Dutta, Somnath Dutta, Rana Roy(2009), “Dynamic behavior of R/C elevated tanks with soil structure interaction,” Elsevier Engineering structures Vol. 31 (2009) Pp2617-2625.
- Tang, Y. Ma. D. and Chang.Y. (1991). "Sloshing Response in a Tank Containing Two Liquids," Proceedings of the 1991ASME PVP Conference, Vol. 223 (9), pp. 97-104
- Veletsos, A.S. and Tang, Y. (1986). “Dynamics of vertically excited liquid storage tanks”, ASCE Journal of Structural Engineering, Vol.112(6), Pp.1228–1246.