【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(gè)關(guān)鍵傳力部位。主梁錨固區(qū)荷載大、空間小、構(gòu)造復(fù)雜、傳力路徑多、應(yīng)力分布不均勻、破壞機(jī)理復(fù)雜,單純的力學(xué)分析難以真實(shí)全面反映結(jié)構(gòu)的實(shí)際應(yīng)力分布和工作狀態(tài)。本文以重慶嘉悅大橋?yàn)楣こ瘫尘?通過(guò)索梁錨固區(qū)的縮尺模型試驗(yàn)和有限元分析比較,得出復(fù)雜的應(yīng)力狀態(tài),以檢驗(yàn)錨固區(qū)的受力性能,同時(shí)針對(duì)存在的問(wèn)題提出相應(yīng)的改進(jìn)意見和建議。首先利用Midas/CIVIL對(duì)嘉悅大橋進(jìn)行全橋計(jì)算,以驗(yàn)證大橋結(jié)構(gòu)安全及性能,同時(shí)為結(jié)構(gòu)局部分析提供荷載邊界條件。其次利用ANSYS軟件針對(duì)索梁錨固區(qū)節(jié)段進(jìn)行空間應(yīng)力有限元分析,為模型試驗(yàn)提供理論依據(jù)。然后進(jìn)行索梁錨固區(qū)節(jié)段縮尺模型試驗(yàn),并與計(jì)算值進(jìn)行比較,對(duì)結(jié)構(gòu)的實(shí)際受力特性進(jìn)行判斷。最后根據(jù)空間應(yīng)力分析和縮尺模型試驗(yàn)結(jié)果,對(duì)實(shí)際橋梁施工控制提出了指導(dǎo)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(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U448.27;U441

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