岩基上大跨度梁式渡槽有限元数值模拟分析

发布时间：2018-04-15 20:56

本文选题：连续梁渡槽 + 简支梁渡槽　；参考：《吉林大学》2017年硕士论文

【摘要】：我国农业经济的快速发展促使各类农田水利工程发展需求不断增强;水工建筑物承载的工程任务不断加重,为此设计者们研发出各类新型结构的水利工程建筑物以满足大流量、大跨度的设计需求。本文以吉林省珲春市某灌区渡槽水毁修复工程为例,通过大型通用有限元软件Ansys对渡槽结构进行数值的仿真模拟计算,分析结构的受力性状、变形特性;通过采用有限元计算方法,实现对渡槽槽身结构、桩基础结构的数值仿真分析,比对不同结构的受力特性区别,总结出各自的优劣势及适用条件;针对工程自身特点及难点,为工程设计提供参考依据及结构优化方案。1.总结、研究复杂结构计算的有限元理论,了解有限元分析过程,探讨采用有限元软件对渡槽结构进行仿真模拟的可行性。2.以渡槽水毁修复工程为例,采用有限元软件对槽身结构在不同工况荷载作用下的受力特性进行数值模拟分析,讨论其各主要部位的位移变形、受力机理、承载能力及相应的处理措施。3.通过模拟分析,对比两种梁式渡槽槽身结构受力特点,研究其各自的优缺点,总结其各自的适用范围。4.探讨桩基—土体—墩台结构模型在有限元计算软件上实现的可行性;通过数值仿真模拟,计算渡槽下部支撑结构在各荷载条件下沉降结果,分析桩身、承台等承重结构的受力,确保上部连续梁结构槽身的小位移要求。通过对已有成果的总结、软件计算理论基础的研究,采用商业通用软件Ansys对结构进行复核、计算、受力性状及特点进行分析是可行的。本文采用该种有限元计算软件针对矩形槽身大跨度梁式结构渡槽进行数值模拟分析,得出各工况组合下结构的受力性状;即简支梁跨中截面拉、压应力均较连续梁结构大,且挠度变形条件不利;连续梁结构整体性好,同时能够节省工程投资。通过采用承台-桩基-土体模型整体建模方法,分别计算了连续梁渡槽在各工况荷载作用下,桩基础承载能力及承载性状,计算结果表明该类结构基础沉降量较小,不会对上部结构产生不利影响。
[Abstract]:With the rapid development of agricultural economy in China, the development needs of all kinds of irrigation and water conservancy projects are constantly strengthened, and the engineering tasks of hydraulic structures are becoming more and more serious. For this reason, designers have developed various kinds of water conservancy engineering buildings with new structures to meet the needs of large volume of water conservancy projects.Large span design requirements.Taking the aqueduct destruction and restoration project in Hunchun City, Jilin Province as an example, the numerical simulation of aqueduct structure is carried out by using the large scale finite element software Ansys, and the mechanical properties and deformation characteristics of the structure are analyzed.By using finite element method, the numerical simulation analysis of aqueduct body structure and pile foundation structure is realized, the difference of stress characteristics of different structures is compared, and the advantages and disadvantages and applicable conditions of each structure are summed up, according to the characteristics and difficulties of the project itself,To provide reference for engineering design and structural optimization scheme. 1.In this paper, the finite element theory of complex structure calculation is studied, the process of finite element analysis is understood, and the feasibility of using finite element software to simulate aqueduct structure is discussed.Taking the aqueduct damage repair project as an example, the finite element software is used to simulate and analyze the stress characteristics of the aqueduct under different working conditions, and the displacement, deformation and stress mechanism of the main parts of the aqueduct are discussed.Bearing capacity and corresponding treatment measures. 3.Through simulation and analysis, the stress characteristics of two kinds of beam-aqueduct are compared, their advantages and disadvantages are studied, and their respective application range is summarized.The feasibility of the pile-soil-pier structure model realized in finite element software is discussed, and the settlement results of the bottom support structure of the aqueduct under various load conditions are calculated by numerical simulation, and the load-bearing structures such as pile body and cap are analyzed.Ensure the small displacement requirements of the upper continuous beam structure slot body.By summing up the existing achievements and studying the theoretical basis of software calculation, it is feasible to use commercial general software Ansys to review, calculate, analyze the mechanical properties and characteristics of the structure.In this paper, the finite element calculation software is used to simulate and analyze the aqueduct with large span of rectangular grooves, and the mechanical behavior of the structure under various working conditions is obtained, that is, the tensile stress and compressive stress of the simple supported beam are larger than those of the continuous beam structure.And the deflection deformation condition is unfavorable, the continuous beam structure integrity is good, at the same time can save the project investment.By adopting the integral modeling method of pile-pile-soil model, the bearing capacity and bearing behavior of pile foundation of continuous beam aqueduct under various working conditions are calculated, respectively. The results show that the settlement of this kind of structure foundation is small.There is no adverse effect on the superstructure.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV672.3

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