本文關(guān)鍵詞： 超大跨 凱威特型巨型網(wǎng)格 自動生成 穩(wěn)定分析 參數(shù)分析　出處：《哈爾濱工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著社會進步和建設(shè)水平的發(fā)展,超大跨空間結(jié)構(gòu)在抵御環(huán)境變化、營造宜居區(qū)域、城市節(jié)能減排等方面有著越來越廣的應(yīng)用前景,受到學(xué)者們的廣泛重視。由于結(jié)構(gòu)跨度上的大幅度增加,必將很大程度上提高結(jié)構(gòu)桿件數(shù)目、桿件尺寸等,直接導(dǎo)致結(jié)構(gòu)在內(nèi)力計算、桿件選擇、穩(wěn)定分析等方面面臨諸多未知與挑戰(zhàn)。本文以提出合理的800m超大跨結(jié)構(gòu)為研究目標(biāo),對比分析了四種備選超大跨結(jié)構(gòu)形式,篩選出其中受力性能最優(yōu)的凱威特型巨型網(wǎng)格作為本課題的研究對象。首次得到其自動生成程序并對其進行了系統(tǒng)的靜力分析、穩(wěn)定分析、參數(shù)分析和子結(jié)構(gòu)分析。從而為該結(jié)構(gòu)的理論研究與工程設(shè)計提供有價值的參考。主要包含以下幾方面內(nèi)容:1、對比分析了800m跨度、一致荷載作用下的雙層網(wǎng)殼、局部三層網(wǎng)殼、肋環(huán)型巨型網(wǎng)格和凱威特型巨型網(wǎng)格的內(nèi)力峰值、最大位移、用鋼量等靜力性能指標(biāo)。篩選出最合理的結(jié)構(gòu)形式——凱威特型巨型網(wǎng)格。并從結(jié)構(gòu)構(gòu)造特點、受力原理等方面對其原因進行了分析。2、利用CAD三維建模進行成型分析并得到凱威特型巨型網(wǎng)格結(jié)構(gòu)的拓?fù)潢P(guān)系,提出了基于幾何成型的結(jié)構(gòu)程序化實現(xiàn)方法。利用APDL參數(shù)化語言結(jié)合此結(jié)構(gòu)幾何形體控制參數(shù)編制其相應(yīng)的自動生成程序,為該結(jié)構(gòu)的深入研究奠定了良好的基礎(chǔ)。3、編制了適用于凱威特型巨型網(wǎng)格結(jié)構(gòu)的荷載程序、選桿程序,并完成該結(jié)構(gòu)靜力計算�？偨Y(jié)了對此結(jié)構(gòu)形式起控制作用的荷載工況,總結(jié)歸納了此結(jié)構(gòu)的內(nèi)力分布規(guī)律。4、考慮巨型網(wǎng)格節(jié)點偏差幾何非線性、材料非線性和桿件初始彎曲幾何非線性的影響進行結(jié)構(gòu)穩(wěn)定性分析。提出了雙重條件判斷整體失穩(wěn)的方法,并總結(jié)了結(jié)構(gòu)整體失穩(wěn)時各參數(shù)的取值規(guī)律。利用弧長法追蹤結(jié)構(gòu)的平衡路徑并編制了相應(yīng)的非線性穩(wěn)定分析程序。對此結(jié)構(gòu)在各非線性因素影響下的承載力變化規(guī)律進行了歸納總結(jié)。通過與其他結(jié)構(gòu)形式對比,并結(jié)合此超大跨結(jié)構(gòu)的特點,對上述規(guī)律的原因進行了分析。5、研究了各參數(shù)變化對結(jié)構(gòu)受力性能的影響,對凱威特型巨型網(wǎng)格結(jié)構(gòu)進行了關(guān)于環(huán)(徑)向分割份數(shù)、矢跨比、桁架高跨比等7個參數(shù)共計153個模型的分析計算�？偨Y(jié)了結(jié)構(gòu)力學(xué)性能隨上述參數(shù)的變化規(guī)律,歸納了各參數(shù)的合理取值范圍,為該結(jié)構(gòu)的深入研究與工程應(yīng)用提供一定的參考。
[Abstract]:With the development of social progress and construction level, super-large cross-space structure has more and more extensive application prospects in resisting environmental change, creating livable areas, and saving energy and emission reduction in cities. Due to the large increase in the span of the structure, the number of members and the size of the members will be greatly increased, which will directly lead to the calculation of the internal force of the structure and the selection of the members. Stability analysis is faced with many unknown and challenges. In this paper, we propose a reasonable 800m super-span structure as the research goal, and compare and analyze four alternative super-span structures. The Kewitt giant mesh which has the best mechanical performance is selected as the research object of this paper. The automatic generating program is obtained for the first time and the static analysis and stability analysis are carried out systematically. Parameter analysis and substructure analysis, thus providing a valuable reference for the theoretical research and engineering design of the structure. The main contents include the following aspects: 1, and the 800m span is compared and analyzed. The peak internal force and maximum displacement of double-layer reticulated shell, local three-layer latticed shell, rib ring giant mesh and Cavette giant grid under uniform load. The most reasonable structure form, Cavett giant mesh, is selected by using the steel equal static performance index, and the causes are analyzed from the structural characteristics and the stress principle. 2. The CAD 3D modeling is used to analyze the modeling and the topological relationship of the Cavette giant mesh structure is obtained. The programming method of structure based on geometric shaping is put forward, and the corresponding automatic generating program is compiled by using APDL parameterization language combined with the control parameters of the geometric shape of the structure. It lays a good foundation for the further study of the structure. 3. A load program and a rod selection program are developed for the Cavette mega grid structure. The static calculation of the structure is completed. The load conditions that control the structure form are summarized. The internal force distribution law of the structure is summarized. 4. The geometric nonlinearity of the giant grid node deviation is considered. The influence of material nonlinearity and initial bending geometric nonlinearity on structural stability is analyzed. A double condition method for judging global instability is proposed. The method of arc length is used to track the equilibrium path of the structure and a corresponding program for nonlinear stability analysis is developed. The bearing capacity variation of the structure under the influence of various nonlinear factors is also summarized. The law of transformation is summarized and compared with other structural forms. Combined with the characteristics of the super-large span structure, the causes of the above law are analyzed, and the influence of various parameters on the mechanical performance of the structure is studied. This paper deals with the ring (diameter) division number and the rise-to-span ratio of the Cavette giant mesh structure. The analysis and calculation of 153 models with seven parameters such as truss height / span ratio are made. The variation law of structural mechanical properties with the above parameters is summarized and the reasonable value range of each parameter is summarized. It provides a certain reference for the further research and engineering application of the structure.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU399

【引證文獻】

相關(guān)會議論文 前1條

1 沈世釗;;大跨空間結(jié)構(gòu)若干關(guān)鍵理論問題研究[A];第九屆空間結(jié)構(gòu)學(xué)術(shù)會議論文集[C];2000年

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本文編號：1463025