An experimental study on prestressed egg-shape digesters

作者：Li Jie^*; Chen Huaming; Chen Jianbing; Fan Minquan; Peng Chunqiang

来源：China Civil Engineering Journal, 2006, 39(5): 35-42.

• Earthquake peak accelerations
• Guangzhou earthquakes
• Prestressed egg-shape digester
• Seismic performance
• Shaking table test

The seismic performance of prestressed egg-shaped digesters (PESD) is studied. A structural model of a 1/8 scale was designed and tested on the shaking table with two earthquake peak accelerations, namely the El Centra and artificial Guangzhou earthquakes. The acceleration, displacement and strain responses were analyzed and compared with the results from FEM modeling. It is found that the half-full model and the empty model mainly assume linear-elastic behavior with only localized non-linear effects. The filled water has apparently reduced the natural frequency of the PESD. The coupling interaction between water and the shell enhances the responses below the middle plane and reduces the responses above the middle plane of the model. Different seismic excitations have distinct influences on the responses of the PESD because of the fact that different frequency spectra and the amplification factors under GZR excitation are greater than those under El-Centro excitation. The calculated results of FEM model agree well with those of the shaking table tests. The results indicate that PESD has good seismic resistances and the FEM model appears to give both rational and reasonable predictive results.

• 出版日期2006
• 单位同济大学