连续刚构桥梁的参数化建模与分析方法研究

发布时间：2018-03-30 10:50

本文选题：参数化建模　切入点：网格划分　出处：《重庆交通大学》2014年硕士论文

【摘要】：随着计算机科学的发展，通用的有限元分析软件在近些年得到了十足的发展，在结构分析计算方面也日趋完善；在桥梁工程实际中，MIDAS/CIVIL、桥梁博士等软件已广泛的应用于结构计算分析中，但是随着对于结构分析的精确度要求越来越高，上述桥梁有限元软件建模方法所采用的梁单元或者杆系单元无法满足现代桥梁设计计算的精度要求，而一些实体分析软件如MIDAS/FEA、ABAQUS建立桥梁结构实体模型时过程又比较复杂，目前在MIDAS/CIVIL中采用建模助手的方法可以大大的简化建模过程，仅仅通过一系列对话框中参数的输入即可实现建模过程；本论文针对现阶段有限元分析软件的不足之处，依托VS C++平台实现对连续刚构桥梁有限元实体网格的参数化建模。为实现对以上内容的掌握，主要从以下具体方面展开理论学习： ①学习MFC对话框的编制过程，建立基于对话框程序来实现人机交互，用户只需要对整个桥梁基本参数的输入，即可实现对任意变截面单箱单室连续刚构桥的外轮廓的确定。 ②学习MIDAS/CIVIL、MIDAS/FEA、RCF、ABAQUS等软件的建模过程，研究分析连续刚构桥梁的受力特点以及设计要求，加深对桥梁孔跨布置以及截面各参数的认识了解，对结构各参数如箱梁高度、底板腹板变化规律以及双薄壁墩间距展开了对比分析；研究各软件在建模方法的优缺点，分析各有限元模型的计算结果。 ③研究桥梁结构横向、纵向各参数的设置与变化规律，通过对各项参数的理解，实现通过参数来建立桥梁截面外轮廓各点坐标的确定；研究各种截面网格划分的方法，通过比对最终确定采用基于CGAL的2D Delaunay三角形网格划分；研究映射机制，通过桥梁纵向任意截面的二维网格划分，采用面积坐标法以及等参坐标法，实现对整个桥梁上部结构的五面体6节点网格的划分；在整个桥梁上部结构网格划分完毕之后根据双薄壁墩的尺寸特点，找出桥墩结构的三维区间，根据其节点坐标沿桥墩高度方向进行映射，完成对桥墩结构的八节点六面体网格的划分；研究节点坐标以及节点编号规律，通过节点坐标建立单元拓扑（每个单元的节点编号）。 ④将节点数据以及单元拓扑生成INP文件导入ABAQUS软件实现中可视化以及计算分析，通过对同一实例的计算，进一步了解各软件建模过程中的优缺点，并且分析比对结果从而验证对于参数化建模网格划分的可行性以及正确性。最后，在文末对连续刚构桥三维网格划分方法进行了总结与展望，对参数化建模的不足之处提出了一些改进意见。
[Abstract]:With the development of computer science, the general finite element analysis software has been fully developed in recent years, and it is becoming more and more perfect in structural analysis and calculation.In the practice of bridge engineering, such software as Midas / CIVILand Doctor of Bridge have been widely used in structural calculation and analysis, but with the increasing demand for the accuracy of structural analysis,The beam element or bar element used in the above bridge finite element modeling method can not meet the precision requirement of modern bridge design and calculation. However, some entity analysis software such as Midas / FEAA Abaqus are more complicated in the process of building the bridge structure entity model.At present, the modeling process can be greatly simplified by using modeling assistant method in MIDAS/CIVIL, and the modeling process can be realized only through the input of parameters in a series of dialog boxes.Parametric modeling of finite element solid mesh of continuous rigid frame bridge is realized based on vs C platform.In order to master the above contents, the theoretical study is mainly carried out from the following specific aspects:The main contents of this paper are as follows: 1. Learning the process of compiling MFC dialog box and establishing a program based on dialog box to realize man-machine interaction. The user only needs to input the basic parameters of the whole bridge, and the user can realize the determination of the outer contour of a single box continuous rigid frame bridge with arbitrary variable cross-section.(2) study the modeling process of Midas / CIVILI / MIDAS-FEAA / RCFU Abaqus and other software, study and analyze the mechanical characteristics and design requirements of continuous rigid frame bridges, deepen the understanding of bridge hole span arrangement and cross-section parameters, and understand the structural parameters such as box girder height,The variation law of bottom plate web and the distance between two thin-walled piers are compared and analyzed, and the advantages and disadvantages of each software in modeling method are studied, and the calculation results of each finite element model are analyzed.(3) study the setting and changing law of the bridge structure's transverse and longitudinal parameters, through the understanding of the parameters, realize the determination of the coordinates of each point of the outer contour of the bridge section by the parameters, and study the methods of grid division of various cross-sections.Through comparison, 2D Delaunay triangular mesh division based on CGAL is adopted, mapping mechanism is studied, 2D mesh division of arbitrary longitudinal section of bridge, area coordinate method and isoparametric coordinate method are adopted.The pentahedron 6 node grid of the whole superstructure of the bridge is realized, and the 3D interval of the bridge pier structure is found according to the size characteristics of the double thin-walled pier after the grid division of the whole superstructure of the bridge is completed.According to the mapping of the node coordinates along the height direction of the pier, the eight-node hexahedron grid of the pier structure is divided, the law of node coordinates and node numbering is studied, and the unit topology (node number of each unit) is established through the node coordinates.(4) the node data and the unit topology generating INP file are imported into the ABAQUS software to visualize and analyze them. Through the calculation of the same example, the advantages and disadvantages of each software modeling process are further understood.The comparison results are analyzed to verify the feasibility and correctness of mesh generation for parameterized modeling.Finally, at the end of the paper, the 3D mesh generation method of continuous rigid frame bridge is summarized and prospected, and some improvement suggestions on the shortcomings of parametric modeling are put forward.
【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】：U448.23

【参考文献】