AN ANALYTICAL STUDY OF THE DYNAMIC RESPONSES OF RC ELEVATED WATER TANKS IN SYRIA UNDER THE EFFECT OF THE FEBRUARY 2023 EARTHQUAKE
Abstract
The hydrodynamic behavior of RC elevated water tanks is quite complex, and understanding the hydrodynamic behavior effect of the soil structure interaction is necessary for predicting the dynamic response of the elevated tank.
In Syria, all RC elevated water tanks were designed to withstand seismic loads that arehigher than the 6th of February earthquake, in which many elevated water tanks had collapsed. In the current study, the reasons behind these collapses will be investigated, and solutions will be proposed.
The present work will discuss a case study, which is the most common RC elevated water tank model used in Syria, with the most number of collapses through the last earthquake. This case study represents a cylindrical tank with 200 m3 capacity, elevated on six columns with a length of 15 [m], and a cross section of 50x80 [cm2], this model was design 50 years ago using the classical method where the hydrodynamic effect of the water was not taken into account. In the present study, a numerical simulation will be obtained for this tank, while the hydrodynamic effect of the water will be taken into account using the equations of American standards ACI 350.3-6, while the time history method, where the Turkey-Syria seismic record was adopted.
Two strengthening methods ware suggested, the first one using bonding slabs, and the other one using bonding beams.The shear force, overturning moment and the maximum displacement were obtained and compared with those calculated from the strengthened models. It was noticed that strengthening methods decreased the shear force, overturning moment, and the maximum displacement.
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