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碾压混凝土高拱坝温度场和温度徐变应力场的并层非均匀单元法三维有限元分析(李克亮)

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【作者】李克亮 【导师】方璟; 洪晓林
"e'Lrnpr,{r8U0【作者基本信息】南京水利科学研究院,水工结构工程,2000年,硕士水利论文*u4q!E"ra9Pfd

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【中文摘要】 本文介绍笔者采用三维有限元法计算碾压混凝土高坝中温度场和温度徐变应力场的方法、原理及结果。 1.在综合分析并层算法和非均质单元法优点的基础上,提出了并层非均匀单元法。并层非均匀单元法中采用了均质模型和等效变形模型两种计算模型;为了数学上处理的方便,把并层非均匀单元中的各个不连续的物理量作了垂向的连续化处理;探讨了低弹模层的相对厚度和弹模折减系数对等效弹性矩阵的影响。 2.讨论了碾压混凝土坝温度场和温度徐变应力场三维有限元分析中的几个技术技巧问题:碾压混凝上上下结合层面上初始温度的赋值方法、计算步长的选取、温度边界的仿真、库水温度的估算、弹性模量和徐变参数的确定。编制了用于徐变参数确定的程序。 3.根据并层非均匀单元法的思想编制了碾压混凝上坝温度场和温度徐变应力场三维有限元分析程序。由笔者的实际运用得知:并层非均匀单元法的提出是可行的;编制的程序是可靠的,并且在保证精度的前提下能大大地减少计算工作量,具有很大的实用性,实现了精度和效率的有机统一。 4.对一典型碾压混凝土高拱坝进行了温度场和温度徐变应力场的三维有限元计算。结果如下:外界气温和浇注温度对碾压混凝土拱坝内部的温度具有较大的影响...更多,有必要控制浇注时的气温和浇注温度;整体碾压混凝土拱坝坝体内部产生了几个不利的主拉应力区。  还原水利论文(l~#c/?zl%d

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【英文摘要】 This thesis introduces the method, theory and results of 3-D FEMcalculation on temperatur field and thermal-creep-stress field in theroller compacted concrete high arch dams.1. On the base of Zone-merged Algorithm and HeterogeneousElement Methd, a new method is advanced named Layer-merged andHeterogeneous Element Method(LHEM). In LHEM, two kinds of modelsare used which are the even model and the equivalent deformation model.In the layer-merged heterogeneous element, some physical quanities aresuccessively handled in vertical. And, some discussion is done about theeffect on the equivalent elastic matrix made by the relative thickness andreducing coefficient of elastic module in the lower elastic module layer.2. Some questions are discussed in 3-D FEM analysis oftemperaturefield and thermal-creep-stress field in Roller Compacted Concrete Dams(RCCD). They are defining of initial temperature, defining the length ofcalculation step, evaluation of water temPerature in reservoir, simulatingof...更多 temperature boundary, defining parameters of elastic module and creep.A program is developed to solve the question on defining parameters ofcreep.3. A program is developed on the base of LHEM. The advancing ofLHEM is proved feasible. The program is proved dependable andpractical. It can greatiy improve the computing efficiency on the premiseof ensuring accuracy. And, it realizes the unity between accuracy andefficiency.4. A 3-D FEM calculation of temerature field and thermal-creep-stress field is done in the roller compacted concrete high arch dam. Someresults are reached. It is needed to control the air tempeture and theconsucting tempeature because that they have great effect on the insidetemperature of the dam. Several adverse regions appear in the arch damWhere the stresses are bigger.  还原

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(v.`'gs"htY0【中文关键词】 碾压混凝上坝; 并层非均匀单元法; 等效变形模型; 程序; 温度场; 温 度徐变应力场; 三维有限元分析
N4c3OJ|0【英文关键词】 RCCD; LHEM; equivalent deformation model; program; temperature field; thermal-creep-stress field; 3-D FEM analysis水利论文&a+i}!{V?It

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TAG: 三维 应力场 拱坝 有限元分析 李克亮
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