重慶嘉悅大橋主梁錨固區(qū)受力分析
發(fā)布時間:2018-07-20 18:37
【摘要】:主梁拉索錨固區(qū)的基本功能是將索力安全、均勻地傳遞到主梁,是矮塔斜拉橋的一個關鍵傳力部位。主梁錨固區(qū)荷載大、空間小、構造復雜、傳力路徑多、應力分布不均勻、破壞機理復雜,單純的力學分析難以真實全面反映結構的實際應力分布和工作狀態(tài)。本文以重慶嘉悅大橋為工程背景,通過索梁錨固區(qū)的縮尺模型試驗和有限元分析比較,得出復雜的應力狀態(tài),以檢驗錨固區(qū)的受力性能,同時針對存在的問題提出相應的改進意見和建議。首先利用Midas/CIVIL對嘉悅大橋進行全橋計算,以驗證大橋結構安全及性能,同時為結構局部分析提供荷載邊界條件。其次利用ANSYS軟件針對索梁錨固區(qū)節(jié)段進行空間應力有限元分析,為模型試驗提供理論依據(jù)。然后進行索梁錨固區(qū)節(jié)段縮尺模型試驗,并與計算值進行比較,對結構的實際受力特性進行判斷。最后根據(jù)空間應力分析和縮尺模型試驗結果,對實際橋梁施工控制提出了指導性建議和要求。
[Abstract]:The basic function of the cable Anchorage zone of the main girder is to transfer the cable force safely and uniformly to the main girder, which is a key force transfer part of the cable-stayed bridge with low tower. The Anchorage zone of the main beam is characterized by large load, small space, complicated structure, many load transfer paths, uneven stress distribution and complex failure mechanism. It is difficult to reflect the actual stress distribution and working state of the structure by simple mechanical analysis. Taking the Jiayue Bridge in Chongqing as the engineering background, through the scale model test and finite element analysis and comparison of cable beam Anchorage zone, the complex stress state is obtained to test the mechanical performance of the anchoring area. At the same time, in view of the existing problems, the corresponding suggestions and suggestions are put forward. First, Midas / CIVIL is used to calculate the whole bridge of Jiayue Bridge to verify the safety and performance of the bridge, and to provide the load boundary conditions for the local analysis of the structure. Secondly, the finite element analysis of spatial stress of cable beam Anchorage zone is carried out by ANSYS software, which provides theoretical basis for model test. Then the model test of cable beam Anchorage zone segment scale is carried out, and compared with the calculated value, the actual force characteristics of the structure are judged. Finally, according to the results of space stress analysis and scale model test, the guiding suggestions and requirements for actual bridge construction control are put forward.
【學位授予單位】:西南交通大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:U448.27;U441
本文編號:2134402
[Abstract]:The basic function of the cable Anchorage zone of the main girder is to transfer the cable force safely and uniformly to the main girder, which is a key force transfer part of the cable-stayed bridge with low tower. The Anchorage zone of the main beam is characterized by large load, small space, complicated structure, many load transfer paths, uneven stress distribution and complex failure mechanism. It is difficult to reflect the actual stress distribution and working state of the structure by simple mechanical analysis. Taking the Jiayue Bridge in Chongqing as the engineering background, through the scale model test and finite element analysis and comparison of cable beam Anchorage zone, the complex stress state is obtained to test the mechanical performance of the anchoring area. At the same time, in view of the existing problems, the corresponding suggestions and suggestions are put forward. First, Midas / CIVIL is used to calculate the whole bridge of Jiayue Bridge to verify the safety and performance of the bridge, and to provide the load boundary conditions for the local analysis of the structure. Secondly, the finite element analysis of spatial stress of cable beam Anchorage zone is carried out by ANSYS software, which provides theoretical basis for model test. Then the model test of cable beam Anchorage zone segment scale is carried out, and compared with the calculated value, the actual force characteristics of the structure are judged. Finally, according to the results of space stress analysis and scale model test, the guiding suggestions and requirements for actual bridge construction control are put forward.
【學位授予單位】:西南交通大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:U448.27;U441
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