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SHAKING TABLE TEST STUDY OF SEISMIC BEHAVIOR ON COLUMN-SUPPORTED GROUP SILOS
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摘要: 以钢筋混凝土柱承式群仓结构为研究对象，对一个缩尺比例1：25的1×3组合群仓模型采用3条地震波分别施加水平作用，进行振动台试验。获得了空仓、半仓和满仓三种贮料状态不同水准地震作用下模型结构的动力特性、加速度和位移响应，分析地震响应及不同工况下的变化规律，揭示群仓中不同位置单仓地震响应的差异，获得了不同位置单仓的基底剪力。研究结果表明：贮料对群仓动力特性的影响与群仓自身不同方向刚度差异有关；不同位置单仓的加速度与位移响应存在显著差异，且与地震作用方向和贮料状态相关；不同单仓基底剪力存在差异，沿X方向边仓大于中仓，沿Y方向则相反，差异的幅度随着贮料增加而降低；建议群仓中各单仓根据其所处的位置进行抗震验算。Abstract: 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.
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Key words:
- group silos /
- stored material /
- shaking table test /
- dynamic characteristics /
- seismic response
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