桩土与结构相互作用效应的卵形消化池三维有限元静动力分析

为全面掌握卵形消化池这种特殊大型结构的受力特点以指导实践，利用ANSYS软件对卵形消化池进行三维有限元静动力分析．计算了卵形消化池在各种荷载工况下的池体变形特点和池壁内力分布情况，分析了地震作用下结构的动态固有特性和动力响应，并采用二步分析法计算考虑桩土与结构相互作用效应的卵形消化池地震响应．结果表明：预应力卵形消化池是一种受力合理的结构形式；空池状态和温度作用下的正常使用状态是两种最不利荷载组合情况：地震作用下池体水平位移随高度逐渐增大；不同方向上池壁内力呈规律变化；考虑桩土与结构相互作用效应的卵形消化池地震响应小于不考虑桩土与结构相互作用效应的卵形消化池地震响应．

3D FEM Static and Dynamic Analyses of an Egg-Shaped Digester Considering the Effect of Pile-Soil-Structure Interaction

Aiming to have a comprehensive grasp of the stress characteristics of egg-shaped digester and to guide practice, the static and dynamic three-dimensional finite element analyses of an egg-shaped digester, which is a special large-scale structure,were accomplished using ANSYS software. The deformation characteristic of the digester body and the internal force distribution on the walls of the digester under various load conditions were computed. The dynamic intrinsic property and the structural dynamic response under seismic action were also analyzed. In addition,a two-step analytic method was employed in calculating the seismic response of the egg-shaped digester while considering the pile-soil-structure interaction. The results show that the prestressed egg-shaped digester is a proper structure style;the empty state and the normal service state under temperature action are the two worst-case load combinations; under seismic action ,the horizontal displacement of the digester body increases with the height ,the stress distribution on the different-direction walls changes with regularity and the seismic response of the egg-shaped digester with a consideration of the effect of pile-soil-structure interaction is smaller than that without a consideration of the pile-soil-structure interaction.