Abstract: At present, domestic tank seismic codes and standards are mainly based on the assumption of rigid foundation, neglecting the effects of soil-structure interaction (SSI) and the cross-interaction between adjacent tanks. A coupled liquid-solid model of a storage tank was developed using the CEL method in ABAQUS. Seismic response analyses were performed under excitation from three recorded natural earthquake waves for systems involving both single tanks and multiple tanks (tank groups), incorporating SSI effects. Taking the tank in the center of the site as the research object, the seismic response of the tank in the case of a single tank soil system and a soil group tank system is compared. The research results show that under a given seismic input, the axial stress of the tank wall at 0.5m above the bottom of the tank exceeds the critical buckling stress, and the tank body has obvious elephant foot deformation. The existence of adjacent tanks around reduces the seismic response of the tank body to some extent. Through the analysis of the ground acceleration of the site, the results show that the presence of the tank body will increase the ground acceleration response.

Key words: storage tank, seismic response, tank group effect, soil-structure interaction