架空斜坡码头结构数值模拟研究

发布时间：2018-02-10 09:55

本文关键词： 装卸工艺桩土绑定约束应力应变稳定性研究结构数值模拟　出处：《重庆交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：架空斜坡码头结构数值模拟研究是基于港口工程规范规程、静力分析和稳定性验证等理论，借助于大型通用有限元软件，对码头结构静力性能进行的分析研究。这是一种既有效又实惠的结构分析方法，通用于工程技术等很多领域中。由于三峡库区水位变幅大、岸坡地形和地质情况复杂等特殊的水文地质条件，码头建设中水工结构与岸坡的相互作用后结构受力变形等问题尤为突出。尽管有限元数值模拟法还具有本构模型参数的多样性和不确定性等缺陷，但利用其预测趋势无疑是当前最为经济而有效的方法。本文以重庆巴南区麻柳镇LNG船舶加气码头为依托，对长江上游库区大水位差LNG架空斜坡码头装卸工艺和总平面布置开展了研究；在考虑到桩基-岸坡土体相互作用效应和库区高水位工况下，对架空斜坡道桩柱结构进行了应力应变的分析研究，总结了架空斜坡码头在受力和变形方面的规律，验证设计的合理性，对受力不利部位提出优化结构的措施，从而为以后类似工程结构设计提供一定的参考。通过对LNG码头装卸工艺设计方案的比选，确定了装卸工艺和总平面布置方案，为相似工程的设计提供参考依据。借助于有限元数值模拟软件，创建各个组成整体模型的几何模型部件，并将其装配。采用架空斜坡码头桩基和岸坡接触表面绑定约束，建立码头桩基与岸坡土体整体模型。科学选取合乎工程实际的各类参数属性和模型本构关系，合理划分整体模型网格，有效加密局部接触部位网格。考虑码头高水位工况下，对整体模型施加码头上部LNG管道、人群产生的均布荷载和库区高水位水流力等作用，对LNG架空斜坡码头桩基与岸坡整体模型进行静力性能分析计算研究，得出整体模型结构的应力应变云图，分析总结架空斜坡码头在受力和变形方面的机理和规律，验证结构设计的合理安全性。此外，，对架空斜坡道受力不利构件或薄弱局部部位进行单独的数值模拟分析研究，验证其在水流力等作用下的稳定性，确保工程设计安全可靠。
[Abstract]:The numerical simulation study of elevated sloping wharf structure is based on the theory of port engineering code, static analysis and stability verification, with the aid of large-scale general finite element software. The static performance of wharf structure is analyzed and studied. It is an effective and affordable structural analysis method, which is widely used in many fields, such as engineering technology, etc. Because of the large fluctuation of water level in the three Gorges Reservoir area, Special hydrogeological conditions such as complex landforms and geological conditions on bank slopes, In the construction of wharf, the problems of stress and deformation of the structure after the interaction between hydraulic structure and bank slope are particularly prominent, although the finite element numerical simulation method also has the defects such as the diversity and uncertainty of constitutive model parameters, and so on. But using its forecast trend is undoubtedly the most economical and effective method at present. In this paper, based on the LNG vessel aeration wharf of Maaliu Town in Banan, Chongqing, the handling technology and general plane arrangement of the large water level difference LNG aerial slope wharf in the upper reaches of the Yangtze River are studied. Considering the pile-slope soil interaction effect and the high water level condition in the reservoir area, the stress and strain analysis of the pile column structure with elevated ramp is carried out, and the law of stress and deformation of the elevated slope wharf is summarized. The rationality of the design is verified, and the measures to optimize the structure are put forward for the unfavorable part of the force, which provides a certain reference for the structural design of similar engineering in the future. Through the comparison and selection of the loading and unloading process design scheme of LNG wharf, the loading and unloading process and the general plane layout scheme are determined, which provides a reference basis for the design of similar engineering. With the help of finite element numerical simulation software, The geometric model components that make up the whole model are created and assembled. The contact surface binding constraint between the pile foundation and the bank slope is adopted. The integral model of pile foundation and slope soil of wharf is established. All kinds of parameter attributes and model constitutive relations are scientifically selected according to the engineering practice, and the whole model grid is reasonably divided, and the grid of local contact position is effectively encrypted. Under the condition of high water level of wharf, The static behavior analysis and calculation of the pile foundation and bank slope integral model of LNG elevated slope wharf are carried out by applying the LNG pipeline in the upper part of the wharf, the uniform load generated by the crowd and the high water level flow force in the reservoir area. The stress-strain cloud diagram of the whole model structure is obtained, the mechanism and law of stress and deformation of the elevated slope wharf are analyzed and summarized, and the reasonable safety of the structure design is verified. In order to ensure the safety and reliability of the engineering design, the numerical simulation and analysis of the unfavorable members or the weak parts of the elevated ramp are carried out to verify its stability under the action of the flow force and so on.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U656.1

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