【作者】 高海；

【导师】 姜忻良；

【作者基本信息】 天津大学 ， 结构工程， 2009， 博士

【摘要】 消化池是污水处理厂中的关键构筑物,属体型高、重量大、构造及受力情况复杂的特种结构,本文的目的在于对其进行深入的分析和研究以指导实践。本文以实际工程为背景,建立了包括上部结构、桩基与土在内的整体数学模型,利用现有大型有限元分析软件-ANSYS,对柱形消化池和卵形消化池进行静、动力分析。给出了与工程实际相匹配的静动力参数;分析中考虑了桩土—结构相互作用;在理论上进行了深入研究,得出了可靠的分析结果。主要创新工作与成果包括以下几个方面:1、本文以实际工程为背景,利用现有大型通用有限元分析软件对消化池进行静、动力分析,得出可靠的分析结果,为实际工程设计提出一些建议,从而为消化池设计提供可靠的计算和分析依据。2、本文在为消化池配置预应力钢筋时,采用等效荷载法把每束预应力钢筋等效到该束钢筋作用的范围内,然后施加于消化池的池壁,推导出了等效荷载的公式,从而得到了比较合理的池壁控制内力。3、在建立卵形消化池计算模型时,首次提出将均匀变化的池壁厚度模拟成沿高度变化的二次曲线,有效提高了模型的精确度。在建立相互作用模型时,将整个下部区域划分为桩土区、近土区和地基无限域远土区。将桩土区模拟为正交各向异性体等效单元;用轴向弹簧-阻尼器单元模拟了粘弹性人工边界。首次将相互作用理论用于卵形消化池分析。4、本文采用的三维直接有限元建模的方式,更好地体现了平移和扭转的耦合反应。首次将分枝模态-二步分析法应用于桩土-消化池动力相互作用分析的实用研究:不是简单地由结构的粗划分过渡到要进行研究的细划分,而是直接模拟实际结构建立简化模型,并能满足实际工程需要的精度。5、本文还提供了利用ANSYS进行消化池静动力分析的命令流,方便设计人员参考使用。文中采用的桩土-消化池相互作用体系动力计算方法,对其他建筑结构的抗震分析也具有一定的参考价值。更多还原

【Abstract】 Digester is the essential construction in sewage treatment plant. It is a kind of special structure with high built, big weight, complex structure and stress status. The goal of the dissertation lies in instructing the practice through thorough analysis and research for digester.This dissertation takes the actual project as the background, in which an overall mathematical model, including the superstructure, the pile foundation and the soil, has been established, the static and dynamic analysis for clylindrical digester and oval digester has been carried on, by using existing large-scale finite element analysis software– ANSYS. The static and dynamic parameter which actually matches with the project has been given; the pile earth - structure interaction has been considered into the analysis; the reliable analysis result has been obtained by conducting thorough research theoretically,. Main innovation work and achievement has been gained in the dissertation which including following several aspects:1、This dissertation takes the actual project as the background, in which the static and dynamic analysis by using existing large-scale finite element analysis software has been carried on, the reliable analysis result has been obtained, some proposals for the reality engineering design has been put forward, thus the reliable computation and analysis basis for the digestion tank design has been provided.2、In this dissertation, when the pre-stressed bar is being arranged, the load produced by each bunch of pre-stressed bar was put on where the bunch of pre-stressed bar touch upon, by using the equivalent load law, then the load was inflicted to the wall of the digester, the equivalent load formula was inferred, thus the reasonable control stress in the wall was obtained.3、When we establish computation model of the oval digester, it is the first time that we try to simulate thickness of the digester wall that evenly changed as the height as a conic in order to enhance the model precision effectively. When we establish an interaction model of the oval digester, we divide the entire lower part region into three parts: the pile soil area, soil area nearby and soil area far away among the ground infinite territory. The pile-soil area is simulated to orthogonal anisotropic body equivalent unit; the viscous-elastic artificial boundary simulated with the axial spring-damper unit. Tt is the first time that the interaction theory is applied for analysis of oval digester.4、The method, three-dimension finite element model being established, has manifested the translation and the reverse coupling response. It is the first time that the branch modality - two step analytic method has been applied in the practical research for the pile and soil-digester interaction analysis: no transforming from the structure rude division to the structure detailed division, but directly simulating actual structure to establish simplification model, and can satisfy the precision needed by actual project. This analysis method for oval digester is applied for the first time in related domestic field. .5、In this dissertation, the order class has been also provided for digester static and dynamic analysis by using ANASYS,which can be refer to designer. The method for the pile and soil -digester interaction system dynamic analysis, applied in the dissertation, also has certain reference value to other construction structure earthquake resistance analysis.更多还原