【摘要】：吊桿是中下承式拱橋最重要的受力構(gòu)件,易遭受腐蝕損傷和疲勞累積損傷,極限情況下甚至發(fā)生突然破斷,威脅結(jié)構(gòu)安全。本文以實際工程為依據(jù),依托于江西省景德鎮(zhèn)市瓷都大橋,結(jié)合大量的文獻資料以及國內(nèi)外的相關(guān)研究成果,通過對工程的現(xiàn)場監(jiān)測和數(shù)值模擬分析相結(jié)合的方法,對瓷都大橋采用加勁鋼管縱梁進行加固后,建立ANSYS有限元分析模型,圍繞吊桿損傷與破斷展開研究。本文主要研究內(nèi)容及成果如下:(1)基于吊桿損傷機理和吊桿損傷過程中拉力與拉應(yīng)力演變理論,將吊桿損傷模擬成為吊桿有效截面積的減少(斷絲數(shù)的增加),分析了吊桿損傷后吊桿系統(tǒng)內(nèi)力重分布的總體趨勢,同時研究一根或多根吊桿損傷時全橋吊桿系統(tǒng)拉力的重分布規(guī)律。(2)討論了模擬吊桿破斷的各種方法的優(yōu)劣,并從中選取較為合理的非線性動力模擬方法,通過建立ANSYS有限元模型,開展了綜合的參數(shù)分析,即對吊桿斷裂的持續(xù)時間、斷裂位置、斷裂吊桿數(shù)量以及斷裂順序等對結(jié)構(gòu)不同構(gòu)件的DAF值和DCR的值的影響進行了研究。(3)由于吊桿斷裂只對同向相鄰吊桿產(chǎn)生比較顯著的影響,且吊桿抵抗損傷的能力大小依次為:S7#S4#S1#,因此分別選取S1#吊桿和S7#吊桿進行破損安全分析。同時,以新吊桿更換后的加固橋梁為基礎(chǔ),建立了限元分析模型,選取S6#、S7#和S8#吊桿分步斷裂的工況進行吊桿連鎖破斷分析,并與原吊桿分析數(shù)據(jù)對比,探究吊桿更換前后的破斷安全性能。
[Abstract]:Suspension rod is the most important force member of middle through arch bridge. It is vulnerable to corrosion damage and fatigue cumulative damage, and even breaks suddenly under the limit condition, which threatens the safety of the structure. Based on the actual project and relying on the Jingdezhen Jingdezhen Bridge in Jiangxi Province, this paper combines a large amount of literature and related research results at home and abroad, through the combination of site monitoring and numerical simulation analysis of the project. After reinforcing the stiffened steel tube longitudinal beam, the ANSYS finite element analysis model is established, and the research is carried out around the damage and fracture of the suspender. The main contents and achievements of this paper are as follows: (1) based on the damage mechanism of suspension rod and the evolution theory of tensile force and tensile stress during the damage process, In this paper, the damage of suspension rod is simulated as the reduction of effective cross section area (increase of the number of broken wires), and the general trend of the redistribution of the internal force of the suspender system after the damage is analyzed. At the same time, the redistribution law of the tension of the whole bridge suspension system when one or more suspenders are damaged is studied. (2) the advantages and disadvantages of various methods to simulate the breaking of the suspenders are discussed, and a more reasonable nonlinear dynamic simulation method is selected. Through the establishment of ANSYS finite element model, the comprehensive parameter analysis is carried out, that is, the fracture duration and fracture position of the suspender are analyzed. The effects of the number of broken suspenders and fracture sequence on the DAF value and DCR value of different structural members are studied. (3) because the breakage of the suspender only has a significant effect on the contiguous and adjacent suspenders in the same direction. And the ability of resisting damage of the suspender is 1: S7 #S4 #S1 #S1 #S1, so the S1# and S7# suspenders are selected for damage safety analysis respectively. At the same time, on the basis of the strengthened bridge after the replacement of the new suspender, the finite element analysis model is established, and the working conditions of S6 #S7# and S8# suspenders are selected to analyze the linkage breakage of the suspenders, and the analysis data are compared with those of the original suspenders. To explore the safety of the break before and after the replacement of the boom.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U447;U448.22

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本文編號：2154672