SOIL-STRUCTURE INTERACTION ANALYSIS OF THE LIQUID STORAGE TANK CONSIDERING HYDRODYNAMIC MASS EFFECTS

摘要

Measurement results for the 1/2-scale liquid storage tank model constructed on Hualien, Taiwan are used to investigate the seismic response characteristics of the liquid storage tank model. Three numerical models having each different foundation environment are used for the study; rigid foundation, flexible foundation with rigid basemat and flexible foundation with flexible basemat. Multi-layered elastic half space for the soil properties, flexible volume method for the flexibility of the tank basemat, and hydrodynamic mass effects for the liquid modeling are introduced to consider the soil-structure interaction effects. Liquid is idealized by lumped mass to represent both impulsive and sloshing effects in horizontal excitation. The model considering the flexible foundation and basemat gives the closest responses in comparison with the responses of the recorded data. It is also shown that the model using rigid basemat or foundation may give rather unrealistic responses compared with the ones of the model considering both flexible foundation and basemat at the soil at the Hualien site composed of sandy gravels.