SHAKING TABLE TEST STUDY OF SEISMIC BEHAVIOR ON COLUMN-SUPPORTED GROUP SILOS

The paper presented an experimental study on the seismic behavior of reinforced concrete group silos with column-supported.A shaking table tests under three seismic waves were carried out on a 1×3 group silos model with a scale of 1∶25.The dynamic characteristics,acceleration and displacement responses of column-supported group silos were obtained in different earthquake levels under three storage conditions of empty, semi-storage and full silo.The seismic response and the variation regulation were analyzed under different conditions. The different seismic responses of single silos were revealed in different locations,and the base shear of single silos were acquired. The results indicated that the influence of stored material on dynamic characteristics of group silos was related to the stiffness discrepancy in different directions. The acceleration and displacement responses of single silos at different locations were significantly different, which was associated with the direction of seismic action and storage conditions. The single silo base shear forces at different locations were different.The base shear force at the end location was larger than that at the middle location in the X direction, while it was opposite in the Y direction,and the difference decreased with the increase of the stored material. It was suggested that each single silo in the group should carry out seismic checking calculation according to its position.