Analysis of Seismic Earth Pressure Acting on Basement Walls of Buildings Using 1g Shaking Table Model Test

抄録

Seismic earth pressure acting on basement walls of buildings is greatly influenced by the dynamic interaction between the surrounding soil and the structure. In this study, a series of 1g shaking table tests were conducted to analyze the influence of the dynamic soil-structure interaction on seismic earth pressure acting on basement wall of building. The building model was prepared to satisfy the scaling laws for the natural frequency, mass, and length of a prototype building. Three models were made to have different conditions with no building, with a three-story building, and with a nine-story building. All models have same basement structure with 3-story. The model ground was prepared with a dense sand layer of about 80% relative density. The sine waves were used as input motion, varying in frequency within the range of 3 to 6 Hz and amplitude within the range of 0.1g to 0.3g. The magnitude and distribution of the seismic earth pressure acting on basement wall were measured using load cells. The test results showed that the magnitude of seismic earth pressure increased as the building height increased. The distribution shape changed from a triangular shape under no-building condition to inverted triangular shape as the building height increased.