本文選題：參數(shù)化建模　切入點：網(wǎng)格劃分　出處：《重慶交通大學(xué)》2014年碩士論文

【摘要】：隨著計算機科學(xué)的發(fā)展，通用的有限元分析軟件在近些年得到了十足的發(fā)展，在結(jié)構(gòu)分析計算方面也日趨完善；在橋梁工程實際中，MIDAS/CIVIL、橋梁博士等軟件已廣泛的應(yīng)用于結(jié)構(gòu)計算分析中，但是隨著對于結(jié)構(gòu)分析的精確度要求越來越高，上述橋梁有限元軟件建模方法所采用的梁單元或者桿系單元無法滿足現(xiàn)代橋梁設(shè)計計算的精度要求，而一些實體分析軟件如MIDAS/FEA、ABAQUS建立橋梁結(jié)構(gòu)實體模型時過程又比較復(fù)雜，目前在MIDAS/CIVIL中采用建模助手的方法可以大大的簡化建模過程，僅僅通過一系列對話框中參數(shù)的輸入即可實現(xiàn)建模過程；本論文針對現(xiàn)階段有限元分析軟件的不足之處，依托VS C++平臺實現(xiàn)對連續(xù)剛構(gòu)橋梁有限元實體網(wǎng)格的參數(shù)化建模。 為實現(xiàn)對以上內(nèi)容的掌握，主要從以下具體方面展開理論學(xué)習(xí)： ①學(xué)習(xí)MFC對話框的編制過程，建立基于對話框程序來實現(xiàn)人機交互，用戶只需要對整個橋梁基本參數(shù)的輸入，即可實現(xiàn)對任意變截面單箱單室連續(xù)剛構(gòu)橋的外輪廓的確定。 ②學(xué)習(xí)MIDAS/CIVIL、MIDAS/FEA、RCF、ABAQUS等軟件的建模過程，研究分析連續(xù)剛構(gòu)橋梁的受力特點以及設(shè)計要求，加深對橋梁孔跨布置以及截面各參數(shù)的認(rèn)識了解，對結(jié)構(gòu)各參數(shù)如箱梁高度、底板腹板變化規(guī)律以及雙薄壁墩間距展開了對比分析；研究各軟件在建模方法的優(yōu)缺點，分析各有限元模型的計算結(jié)果。 ③研究橋梁結(jié)構(gòu)橫向、縱向各參數(shù)的設(shè)置與變化規(guī)律，通過對各項參數(shù)的理解，實現(xiàn)通過參數(shù)來建立橋梁截面外輪廓各點坐標(biāo)的確定；研究各種截面網(wǎng)格劃分的方法，通過比對最終確定采用基于CGAL的2D Delaunay三角形網(wǎng)格劃分；研究映射機制，通過橋梁縱向任意截面的二維網(wǎng)格劃分，采用面積坐標(biāo)法以及等參坐標(biāo)法，實現(xiàn)對整個橋梁上部結(jié)構(gòu)的五面體6節(jié)點網(wǎng)格的劃分；在整個橋梁上部結(jié)構(gòu)網(wǎng)格劃分完畢之后根據(jù)雙薄壁墩的尺寸特點，找出橋墩結(jié)構(gòu)的三維區(qū)間，根據(jù)其節(jié)點坐標(biāo)沿橋墩高度方向進行映射，完成對橋墩結(jié)構(gòu)的八節(jié)點六面體網(wǎng)格的劃分；研究節(jié)點坐標(biāo)以及節(jié)點編號規(guī)律，通過節(jié)點坐標(biāo)建立單元拓?fù)洌總�單元的節(jié)點編號）。 ④將節(jié)點數(shù)據(jù)以及單元拓?fù)渖蒊NP文件導(dǎo)入ABAQUS軟件實現(xiàn)中可視化以及計算分析，通過對同一實例的計算，進一步了解各軟件建模過程中的優(yōu)缺點，并且分析比對結(jié)果從而驗證對于參數(shù)化建模網(wǎng)格劃分的可行性以及正確性。 最后，在文末對連續(xù)剛構(gòu)橋三維網(wǎng)格劃分方法進行了總結(jié)與展望，對參數(shù)化建模的不足之處提出了一些改進意見。
[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.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U448.23

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