Dynamical Analysis Of Liquid Storage Tank Excited By Horizonal And Vertical Earthquakes

Liquid storage tanks are very important components of industrial andagricultural facilities. The vulnerability of cylindrical tanks subjected to earthquakeground motion has been exposed in almost every major earthquake. It is necessary tostudy the behavior of seismically excited cylindrical tanks.In the present thesis, emphasis is laid on the dynamical analysis of liquid storagetank subjected to horizonal and vertical earthquake excitations. It is assumed that theliquid is an ideal fluid which is inviscid, incompressive and non-rotational. The fluidpressure is split into three components, fluid pressure due to the ground acceleration,fluid pressure due to sloshing and fluid pressure caused by the tank deformationrelative to the base circle. In order to get the dynamical response of the tank, sometypical tank deformation shapes is assumed. Based on the principle of virtual work,governing equations of the system are deduced, dynamical responses due to threetypical earthquakes on a practical tank are studied carefully. To investigate theinfluence of vertical earthquake, the dynamical responses of the tank under horizonalexcitation are compared with those under horizonal and vertical earthquakes. Theresults show that the influence of vertical earthquake is of minor relevance and mightbe negleted. The results can be used in seismic design of storage tanks.