斜拉橋拉索損傷狀態(tài)的有限元模擬與模型試驗研究
發(fā)布時間:2018-06-26 01:12
本文選題:斜拉橋 + 拉索損傷評估 ; 參考:《湖南科技大學》2014年碩士論文
【摘要】:斜拉索是斜拉橋關鍵構件,承受橋梁全部荷載。斜拉索的工作狀態(tài)直接關系到整個斜拉橋的健康狀態(tài),所以拉索損傷狀態(tài)的研究對于斜拉橋安全運營具有重要的實際工程意義。本文以廣東九江大橋為工程背景,建立了該橋的縮尺試驗模型和相應的ANSYS有限元模型,采用灰色關聯(lián)分析理論,對拉索損傷狀態(tài)進行了分析和試驗研究。論文主要研究內容如下: (1)在綜合國內外文獻基礎上,介紹了斜拉橋結構損傷評估與斜拉索損傷評估研究現狀。 (2)建立了廣東九江大橋縮尺模型的ANSYS模型,結合試驗驗證了有限元模型,在此基礎上分析了單根及兩根拉索斷開后拉索的受力狀態(tài)。 (3)基于有限元模擬數據,采用灰色關聯(lián)分析理論,獲得了拉索斷開后索力的關聯(lián)度。通過合理確定關聯(lián)度閥值,建立了拉索狀態(tài)評估的索力關聯(lián)影響矩陣。 (4)制作了縮尺模型,在每根拉索安裝了拉力傳感器,開展了單根及兩根拉索斷開的模擬試驗。對有限元分析和試驗結果進行了對比研究,驗證了基于索力關聯(lián)矩陣進行拉索狀態(tài)評估的可行性。
[Abstract]:The cable is the key component of the cable-stayed bridge and bears all the loads of the bridge. The working state of the cable is directly related to the health state of the whole cable-stayed bridge, so the study of the cable damage state is of great practical significance for the safe operation of the cable-stayed bridge. Based on the engineering background of Jiujiang Bridge in Guangdong Province, the paper establishes the scale test model of the bridge and the corresponding finite element model of ANSYS. The damage state of cable is analyzed and tested by using the theory of grey correlation analysis. The main contents of this paper are as follows: (1) on the basis of synthesizing domestic and foreign literature, the present situation of damage assessment and cable damage assessment of cable-stayed bridges is introduced. (2) ANSYS model of scale model of Jiujiang Bridge in Guangdong Province is established. The finite element model is verified by experiments, and the stress state of single cable and two cables after disconnection is analyzed. (3) based on finite element simulation data, grey relational analysis theory is used. The correlation degree of cable force after cable disconnection is obtained. By reasonably determining the threshold value of correlation degree, a cable force correlation influence matrix is established. (4) A scale model is made, a tension sensor is installed in each cable, and a simulation test of single cable and two cables disconnection is carried out. The finite element analysis and experimental results are compared to verify the feasibility of cable state evaluation based on cable force correlation matrix.
【學位授予單位】:湖南科技大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:U446;U448.27
【參考文獻】
相關期刊論文 前6條
1 譚國金;王龍林;程永春;;基于灰色系統(tǒng)理論的寒冷地區(qū)斜拉橋索力狀態(tài)預測方法[J];吉林大學學報(工學版);2011年S2期
2 楊梅;卿曉霞;王波;;基于改進遺傳算法的神經網絡優(yōu)化方法[J];計算機仿真;2009年05期
3 張炎圣;陸新征;寧靜;江見鯨;;超高車輛撞擊組合結構橋梁的仿真分析[J];交通與計算機;2007年03期
4 許宏元;侯旭;劉士林;;火災后混凝土橋梁的損傷識別與狀態(tài)評估[J];現代交通技術;2009年01期
5 徐宏;黃平明;韓萬水;;結構頻率和索力指標的拉索損傷快速識別方法[J];武漢理工大學學報(交通科學與工程版);2010年03期
6 張彬;陳陽;;模糊綜合評估在橋梁損傷評估中的應用[J];科學技術與工程;2007年01期
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