基于极限承载力的在役高桩码头整体安全度分析方法研究

发布时间：2018-04-14 18:13

本文选题：高桩码头 + 极限承载力　；参考：《天津大学》2014年硕士论文

【摘要】：高桩码头结构在使用的过程中，，由于环境条件、管理运营不善及结构老化等因素作用，致使结构构件破损劣化，难以发挥其应有的功能，结构整体的安全性也因此而受到严重影响。为避免重大安全事故的发生，掌握码头结构所处的安全状态，需利用有效的分析方法对其安全程度进行判定。然而目前工程界所使用的分析方法多集中于构件层面上，对结构整体安全度分析方法的研究较少。本文依据可靠度基本理论，以结构整体极限承载力（结构抗力）和作用荷载（作用效应）为随机变量，构建反映高桩码头结构整体安全度的功能函数，采用JC法计算结构整体安全度下的可靠指标，建立了对在役高桩码头结构进行整体安全分析的有效方法。本文的主要研究内容如下：（1）以大型通用性有限元软件ANSYS为平台，建立了高桩码头结构整体极限承载力分析的非线性三维数值模型，分别对堆货荷载、门机荷载以及组合竖向荷载条件下高桩码头结构的整体极限承载力进行了计算分析，并对模型计算结果的准确性进行了验证。（2）应用ANSYS软件的APDL程序语言编写自动智能化有限元分析系统程序，将影响结构极限承载力的因素进行抽样并形成求取高桩码头结构整体极限承载力的输入样本，进行有限元计算得到不同荷载条件、不同组合工况下高桩码头结构极限承载力的统计分析样本。（3）利用有关概率分布检验方法及样本统计分析方法，分别对不同荷载条件、不同组合工况下高桩码头结构整体极限承载力的样本进行了详细的统计分析，确定了高桩码头结构极限承载力的概率分布类型为正态分布，并给出了相应的统计参数。（4）参照目前结构可靠度的基本理论，以结构整体极限承载力及其对应的作用荷载为随机变量，构建反映高桩码头结构整体安全度的功能函数，结合本文得出的结构极限承载力的概率分布与统计参数，采用MATLAB编写JC法迭代计算程序对结构整体安全度下的可靠指标进行计算，建立了高桩码头结构整体安全分析的高效近似计算方法。（5）根据天津港某高桩码头的工程检测资料，建立该码头的三维有限元模型。采用本文所述的高桩码头结构整体安全分析方法，对该结构的可靠指标进行计算分析，全面展示了本文方法的应用流程并验证了该方法的有效性。
[Abstract]:In the process of using high pile wharf structure, due to environmental conditions, poor management and operation, structural aging and other factors, structural members are damaged and degraded, so it is difficult to give full play to its proper function.The overall security of the structure is also seriously affected.In order to avoid the occurrence of major safety accidents and grasp the safety state of wharf structure, it is necessary to use effective analysis method to judge the safety degree of wharf structure.However, most of the analysis methods used in the engineering field are focused on the component level, and the research on the overall safety degree of the structure is less.Based on the basic theory of reliability and taking the ultimate bearing capacity (structural resistance) and action load (action effect) as random variables, a function function reflecting the overall safety degree of high pile wharf structure is constructed.The JC method is used to calculate the reliability index under the overall safety degree of the structure, and an effective method to analyze the overall safety of the existing high pile wharf structure is established.The main contents of this paper are as follows:1) based on the large-scale universal finite element software ANSYS, a nonlinear three-dimensional numerical model for the ultimate bearing capacity analysis of high pile wharf structure is established.The overall ultimate bearing capacity of high pile wharf structure under portal crane load and combined vertical load is calculated and analyzed, and the accuracy of the model calculation results is verified.2) the automatic intelligent finite element analysis system program is compiled by using the APDL program language of ANSYS software. The factors affecting the ultimate bearing capacity of the structure are sampled and the input sample is formed to obtain the overall ultimate bearing capacity of the high pile wharf structure.The statistical analysis samples of ultimate bearing capacity of high pile wharf structure under different load conditions and different combined working conditions are obtained by finite element method.3) using the probabilistic distribution test method and the sample statistical analysis method, the samples of the overall ultimate bearing capacity of the high pile wharf structure under different load conditions and different combination conditions are analyzed in detail.The probability distribution type of ultimate bearing capacity of high pile wharf is determined as normal distribution, and the corresponding statistical parameters are given.With reference to the basic theory of structural reliability at present and taking the ultimate bearing capacity of the structure and its corresponding action load as random variables, a functional function reflecting the overall safety degree of the high pile wharf structure is constructed.Combined with the probability distribution and statistical parameters of the ultimate bearing capacity of the structure obtained in this paper, MATLAB is used to compile the JC iterative calculation program to calculate the reliability index under the overall safety degree of the structure.An efficient approximate calculation method for overall safety analysis of high-pile wharf structure is established.According to the engineering inspection data of a high pile wharf in Tianjin Port, the 3D finite element model of the wharf is established.The reliability index of the high pile wharf structure is calculated and analyzed by using the overall safety analysis method described in this paper. The application flow of this method is fully demonstrated and the validity of the method is verified.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U656.113

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