【作者】 王云仓；

【导师】 练继建； 顾辉；

【作者基本信息】 天津大学 ， 水利水电工程， 2008， 博士

【摘要】 我国正在修建的南水北调中线工程中,大流量渡槽是输水建筑物的一种重要结构型式,槽身多采用三向预应力多侧墙结构,属空间整体受力结构。该结构型式的设计目前存在许多问题尚未解决,如三向超静定结构设计计算理论、温度荷载对结构应力的影响、湿模态相互作用及地震反应、水体非线形晃动对结构的作用等问题。由于这些问题尚未解决造成渡槽裂缝,对渡槽结构的安全产生很大的威胁。针对大型渡槽工程设计中存在的一系列问题,通过深入细致的研究以保证渡槽结构的稳定性、经济性和合理性。其主要研究内容和成果如下:1.提出了三向超静定理论在特大型渡槽工程设计计算中的应用。对于多侧墙结构的渡槽槽身,其结构设计理论停留在把渡槽简单分纵向和横向两个方向分别计算,并依此配置钢绞线和钢筋,致使计算结果,对中墙计算结果保守,边墙则偏于危险。利用该理论计算成果,经实验验证,设计合理,安全可靠。2.提出了热-结构耦合分析方法应用于多侧墙槽身结构的温度应力计算。基于ANSYS程序的耦合场考虑2个或多个物理场之间相互作用的分析,采用顺序耦合法对渡槽的温度应力进行分析计算,求解其温度场,计算出结构的整体应力。3.应用流体理论及结构的振动方程,分析了槽身挡水墙结构的湿模态特性,推导得出湿模态正交关系的动荷载相应公式,计算表明,由于巨大水质量惯性作用影响,即使抗震设防烈度不高的情况下,竖向地震作用对承重结构也具有较大影响。计算了地震波由基岩面入射条件下,渡槽连同桩基一起构成的渡槽整体系统的动力特性。4.基于ANSYS有限元程序,通过分析计算钢绞线的施工张拉顺序对结构应力的影响,以应力状态确定钢绞线张拉工艺,避免了施工过程中槽身的裂缝。5.建立了渡槽工程三维有限元计算程序,结合南水北调中线漕河渡槽工程实际(注:漕河渡槽目前是我国第一座最大的三向预应力多侧墙结构工程)提出了结构应力计算成果,建设已完工,经检验设计合理,安全可靠。6.首次研究了三向预应力多侧墙渡槽槽身的裂缝控制。针对目前几乎“无槽不裂”的现实,通过对多侧墙渡槽槽身的裂缝机理进行全面研究和分析,研究了从设计到施工应采取的裂缝控制措施,对潜在导致槽身的裂缝因素进行有效预防。7.通过槽身结构模型的设计与试验,检验槽身结构设计和钢绞线布束在承载能力和正常使用极限状态是否满足要求。对三向预应力多侧墙渡槽的承载能力给出规律性结论。更多还原

【Abstract】 The middle line water transfer project from south to north is constructing in China. The huge current capacity aqueduct is one of the important structure type in water distribution. Three dimension pre-stressed multi-side wall structure is often used. It has many problems which have not solve, such as calculation theory, the influence of temperature to the structure, the wet modality affects on each other and the earthquake respond, water non-linear shake works on the structure and so on. Because of above questions, it’s a high threat to the security of the aqueduct, such as structural crack. Base on above questions, research on the stability, the efficiency and the rationality of aqueduct.The main research contents and achievement list as follows:1.Bring forward the structural design computation theory in large three dimension pre-stressed multi-side wall aqueduct. Its structural design theory pauses in divides the aqueduct into two directions separately. Disposes the steel stranded wire and the steel bar according to calculates of lengthways and the transverse. The result is conservative to the middle wall, the side wall is more dangerous. Using this theory, the experiment confirms that the design is reasonable and reliable.2. Bring forward the hot-structure coupling analysis method on the multi-side wall structural temperature computation. The ANSYS program coupled fields considered 2 or more physical fields affects each other. Used the sequence coupling method can solve its temperature field and calculate the structure stress.3.Using the fluid theory and the structural vibration equation, analyzed the structural wet modality characteristic, obtains the wet modality orthogonal relations and vibration load formulas. The computation indicated that water quality effect and its inertia influence, even in low earthquake intensity situation, the vertical earthquake function is hugeous. On the earthquake wave incidence by the bedrock surface, calculated the aqueduct integrated system dynamic performance.4. By calculated the steel stranded wire construction process based on the ANSYS program, determined the steel stranded wire construction process.5.Established the three dimensional finite element aqueduct computational program, combine with Caohe aqueduct (Caohe aqueduct is the first biggest three dimension pre-stressed multi-side wall structural engineering in our country). Bring forward the structural stress computation result and has endured the experimentation.6. Studied the crack control of this type aqueduct first time. The reality is“every aqueduct exists crack”. Through the research and analysis on the crack mechanism, analyzed the crack control measure from design to construction, give advices on how to avoid the crack. 7.Through the model design and experiment of aqueduct structural, examines the structure and the steel stranded wire in bearing capacity. Give regular conclusions on this type aqueduct bearing capacity.更多还原