Dynamic Characteristics Of Liquid Sloshing In Tank Induced By Earthquake Excitation And Its Liquid Hammer Shock Failure

So far,the existing international design standards and standards for storage tanks only consider the impact of static load of seismic load and operating pressure on equipment failure,and lack of the hydrodynamic effect of liquid sloshing in storage tank under seismic excitation,and research on the hydrodynamic response of liquid sloshing in tank under seismic excitation and Influence of fluid solid coupling liquid shock load on equipment failure is a serious lack.Recently,the research on the fluid dynamics effect of the liquid sloshing in the storage tank under the action of seismic excitation,and the research on the failure mechanism of fluid-solid coupling liquid-impact shock has attracted the attention of foreign researchers.In view of the serious lack of relevant research,a simulation platform for dynamic response of liquid sloshing in storage tanks under comprehensive seismic excitation with the reciprocating seismic excitation,oscillating seismic excitation and reciprocating vertical seismic excitation is studied and established.The key control parameters of the liquid sloshing dynamic response in the tank were studied.The relationship among seismic excitation characterization parameters—the dynamics of the liquid sloshing in the tank— fluid-structure coupled liquid shock pressures was constructed.The dynamic response of the liquid sloshing in the tank under the combined earthquake excitation and the safety evaluation on the impact failure of storage tank induced by the fluid solid coupling liquid shock load were studied.The following main conclusions were obtained:Based on the secondary development and ANSYSWORKBENCH software,a simulation platform for synthetically considering the dynamic response of liquid sloshing in storage tanks under comprehensive seismic excitation with the reciprocal seismic excitation,oscillating seismic excitation and reciprocating vertical seismic excitation was studied.The results show that the seismic excitation frequency,the seismic excitation velocity and the seismic excitation swing angular velocity are the key control parameters affecting the liquid sloshing dynamic response in the storage tank.The fluid-solid coupling impact pressure induced by liquid sloshing in the storage tank is positively correlated with these key control parameters.Under the coupling interaction of reciprocating seismic excitation,oscillating seismic excitation,and reciprocating vertical earthquake excitation,the liquid-soil-coupled impact pressure induced by liquid sloshing in a horizontal tank is as high as 1.66 MPa.Precondition for accurate prediction of impact load under seismic risk conditions is the dynamic response of liquid sloshing in storage tank under comprehensive seismic excitation with the reciprocal seismic excitation,oscillating seismic excitation and reciprocating vertical seismic excitationThe research results show that the horizontal pressure vessel designed according to the current standard can not resist the shock failure induced by liquid sloshing shock load caused by complex earthquake excitation.In order to ensure the safety of horizontal storage tanks under the action of combined seismic excitation,the storage tank design criteria must be established in which the influence of liquid sloshing shock pressure induced by compound seismic excitationmust be comprehensively considered.