【摘要】：斜拉橋的索梁錨固區(qū)作為聯(lián)系斜拉索與主梁的重要部位,在長期荷載作用下存在傳遞荷載大、傳力機(jī)理復(fù)雜、局部應(yīng)力集中等問題。新建岳口漢江特大橋是國內(nèi)少有的應(yīng)用錨拉板式索梁錨固結(jié)構(gòu)的鐵路斜拉橋,其邊腹板直接伸出頂板15cm,錨拉板結(jié)構(gòu)直接與其對接焊接。本文基于漢江特大橋新型錨拉板結(jié)構(gòu),對其進(jìn)行了全面深入的研究,主要的研究內(nèi)容和成果如下:1、對錨拉板式索梁錨固區(qū)進(jìn)行有限元仿真分析,通過多種單元組合的方法進(jìn)行相互驗證,最終確定錨拉板結(jié)構(gòu)部分運(yùn)用板殼單元與實體單元相結(jié)合的建模方式較為合理。2、對岳口漢江特大橋錨拉板式索梁錨固結(jié)構(gòu)進(jìn)行空間有限元分析,分析了在最不利索力作用下錨拉板式索梁錨固結(jié)構(gòu)以及箱梁的應(yīng)力大小以及分布規(guī)律特性;分析了錨拉板結(jié)構(gòu)主要傳力焊縫的應(yīng)力變化趨勢,提出了改善應(yīng)力分布、減小應(yīng)力集中現(xiàn)象的一些措施。3、根據(jù)應(yīng)力等效原則,設(shè)計岳口漢江特大橋錨拉板式索梁錨固結(jié)構(gòu)的試驗?zāi)Ｐ?通過有限元分析計算,比較不同的設(shè)計方案,最終確定把方案三作為疲勞試驗?zāi)Ｐ?并將試驗?zāi)Ｐ湾^拉板各板件的計算結(jié)果與原橋模型的錨拉板各板件計算結(jié)果做對比,確定疲勞試驗?zāi)Ｐ偷暮侠硇耘c可行性。4、在仿真分析的基礎(chǔ)上,進(jìn)行錨拉板模型試驗研究。由試驗結(jié)果可知:錨拉板結(jié)構(gòu)各主要板件的實測數(shù)據(jù)與有限元仿真分析結(jié)果吻合度較高,采用有限元數(shù)值分析對橋梁結(jié)構(gòu)局部應(yīng)力分析是行之有效的。在疲勞驗證階段,各測點均處于彈性工作狀態(tài),錨拉板結(jié)構(gòu)沒有出現(xiàn)裂紋;在疲勞破壞階段,模型各測點測試值隨荷載循環(huán)次數(shù)的增加也基本保持不變,模型各測點應(yīng)力規(guī)律與疲勞驗證階段基本相同。最后通過對模型結(jié)構(gòu)進(jìn)行取樣打磨觀測并沒有發(fā)現(xiàn)裂紋。因此,漢江特大橋錨拉板結(jié)構(gòu)具有足夠的疲勞強(qiáng)度儲備。
[Abstract]:The anchoring zone of cable-beam of cable-stayed bridge is an important part of connecting cable with main beam. Under the action of long-term load, there are some problems such as large transfer load, complicated mechanism of transmission force, local stress concentration and so on. The newly built Yuekou Hanjiang River Bridge is a rare railway cable-stayed bridge with anchor plate type cable beam anchor structure in China. The side web of the bridge extends directly to the roof of 15 cm and the anchor plate structure is welded directly with the bridge. In this paper, based on the new type anchor plate structure of Hanjiang River Bridge, the main research contents and results are as follows: 1, finite element simulation analysis of anchoring area of anchor plate cable beam is carried out. The method of combination of various elements is used to verify each other. Finally, it is determined that the modeling method of the combination of plate and shell element and solid element is more reasonable in the structure part of anchor and pull plate. 2. The finite element analysis of the anchor plate cable beam Anchorage structure of the Yuekou Hanjiang River Bridge is carried out, and the stress size and distribution characteristics of the anchor plate cable beam under the action of the least effective cable force are analyzed. This paper analyzes the stress variation trend of the main force transfer weld of anchor and pull plate structure, and puts forward some measures to improve the stress distribution and reduce the stress concentration phenomenon. 3. According to the principle of stress equivalence, some measures are proposed to improve the stress distribution and reduce the stress concentration phenomenon. The test model of anchor plate type cable beam Anchorage structure of Hanjiang River Bridge in Yuekou is designed. Through finite element analysis and calculation, different design schemes are compared, and the third scheme is determined as fatigue test model. By comparing the calculation results of the test model with those of the original bridge model, the rationality and feasibility of the fatigue test model are determined. 4, on the basis of simulation analysis, The model test of anchor and pull plate was carried out. The experimental results show that the measured data of the main plates of the anchor plate structure are in good agreement with the results of the finite element simulation analysis, and it is effective to use the finite element numerical analysis to analyze the local stress of the bridge structure. At the stage of fatigue verification, each measuring point is in elastic working state, and no cracks appear in the anchor plate structure. In the fatigue failure stage, the measured values of each measuring point of the model also remain basically unchanged with the increase of the number of cycles of load, and the stress law of each measuring point of the model is basically the same as that of the fatigue verification stage. Finally, no cracks were found by sampling and grinding the model structure. Therefore, the Anchorage plate structure of Hanjiang River Bridge has enough fatigue strength reserve.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U448.27

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