【作者】 王贺；

【导师】 李彦军；

【作者基本信息】 河北工程大学 ， 水工结构工程， 2009， 硕士

【摘要】 南水北调工程是为解决我国水资源分布不均而兴建的大型水利工程。渡槽是南水北调工程中跨越河流、道路等的重要架空输水建筑物。在南水北调中线工程中大型渡槽就有数十座,且大部分位于地震烈度Ⅶ度及Ⅶ度以上地区,这些渡槽的抗震设计对整个南水北调中线工程的安全和经济运行有着至关重要的影响。因此,开展大型渡槽结构地震反应分析的研究具有重要的现实意义。我国目前尚未颁布渡槽的抗震设计规范,在《水工建筑物抗震设计规范》中也无渡槽抗震设计的具体规定,近年来,因南水北调工程建设的需要,有不少设计研究人员致力于大型渡槽结构的抗震研究,取得了可观的研究成果,但大部分研究强调的是渡槽抗震计算的某个侧面,如主要针对渡槽结构的流固耦合作用、地震波一致输入和多点输入问题、预应力筋作用等因素中的某一因素进行研究,综合考虑各种因素影响建立大型渡槽结构整体有限元动力模型的研究较少,本文参考国内外有关渡槽抗震研究方面的大量文献,总结出大型渡槽动力分析模型需要考虑的各种影响因素及其合理的简化处理方法,其中包括模型计算范围的选取、结构与水的流固耦合作用、地震波的输入方式、盆式支座的模拟、预应力筋模拟、临跨荷载、顶部拉杆和底部横梁的影响,探讨采用大型有限元分析软件ANSYS中的梁单元、板壳单元、弹簧单元、质子单元和实体单元对渡槽整体结构进行有限元离散,利用该模型分析南水北调中线工程泜河渡槽三槽无水、中槽过水、两边槽过水和三槽过水四种运行工况的振动特性和在天津宁河地震波激励下的时程反应结果,找出渡槽不同运行工况各关键部位的最大位移及其变化规律和应力薄弱部位,依此提出合理的工程措施,所得结论为实际的设计提供参考。更多还原

【Abstract】 The project of transporting water from south to north is a large water conservancy works for relieving the disproportion of water resources of China. The aqueduct of the project is the overhead water transporting construction which strides across rivers and roads. There are a few dozens of large-scale aqueducts in the main canal of the project and most of which locates in the regions where the earthquake intensity isⅦdegree or overⅦdegree. It is important to insure the seismic design security and economy utilize of the construction. So the study of seismic response for large-scale aqueducts has important practical significance.Specifications for aqueduct has not promulgated in our country yet. There is also no prescription for seismic-resistant design in Specifications for seismic design of hydraulic Structure. Recently many designers and researchers devoted to study seismic research of large-scale aqueducts and obtained considerable achievements, but most of research emphasizes some factor, few researches contain all influencing factors. This article refer to the relevant domestic and international literature about seismic research of Aqueduct ,and summed up that the dynamic analysis models of a large aqueduct need to consider the various factors and reasonable simplified way, including selection of model’s calculated range、the fluid-solid coupled interaction of structure and water、the input mode of seismic wave、the simulation of pot bearing、the simulation of prestressed reinforcement、the load of adjacent span、the influence of the top pull rod and the based beam. At the same time, it carried out finite element discretization to the whole unit of the aqueduct by using the beam element、plate-shell element、spring element、proton element and entity element in ANSYS-a large-scale finite element analysis software. Via this model, the article analyzed vibration characteristics of four kinds of running conditions which are no water in three grooves、running water in the middle groove、running water in two sides grooves、running water in three grooves and get the reflection result of time history by the excitation of TIANJINNINGHE seismic wave to DI River Aqueduct in the middle project of south-to-north water transfer. And find out the biggest value and the change law of the key department and the waken part on stress in different working conditions, bring forward reasonable measures and the conclusions provide reference for practical design.更多还原