【摘要】：為了使PC連續(xù)剛構橋的內力、位置等情況盡可能的與設計值吻合,必須在橋梁施工時對其進行準確合理的線形控制。橋梁的線形控制中最重要的就是橋梁預拱度的設置問題。本文簡要闡述橋梁線形控制的相關理論,以及線形控制中預測預拱度的方法,著重研究用灰色理論預測模型作為預拱度預測的方法。在原有灰色理論預測模型法基礎上,提出一種修改原模型中背景值與緊鄰均值的新預測模型,通過對幾組數(shù)據(jù)的對比研究證明其具有更高的預測精度。最后,結合某大型PC連續(xù)剛構橋實例,通過運用有限元軟件MIDAS/CIVIL建立剛構橋模型,并將70~73四個節(jié)點預拱度的理論設計值與施工測量值的比值作為原始數(shù)據(jù)代入新預測模型,再將預測的下一節(jié)段預拱度的數(shù)值與實際測量值進行比對,結果證明:改進的灰色理論預測模型在橋梁預拱度的預測上,滿足施工精度的要求,可以用來指導橋梁的線形施工問題。
[Abstract]:In order to make the internal force and position of PC continuous rigid frame bridge coincide with the designed value as much as possible, it is necessary to carry out accurate and reasonable linear control during the construction of the bridge. The most important problem in the linear control of bridge is the setting of bridge pre-camber. In this paper, the relevant theory of bridge alignment control and the prediction method of pre-camber in linear control are briefly described, and the grey theory prediction model is emphatically studied as the prediction method of pre-camber. On the basis of the original grey theory prediction model, a new prediction model is proposed, which modifies the background value and the close neighbor mean value in the original model. The comparison of several sets of data proves that it has higher prediction accuracy. Finally, combined with an example of a large-scale PC continuous rigid frame bridge, the rigid frame bridge model is established by using the finite element software MIDAS/CIVIL, and the ratio of the theoretical design value to the construction measurement value of the pre-camber of the four nodes 70m 73 is taken as the original data into the new prediction model. Then the predicted pre-camber value of the next segment is compared with the actual measured value. The results show that the improved grey theory prediction model meets the requirements of construction accuracy in the prediction of the bridge pre-camber, and the results show that the improved grey theory prediction model can meet the requirements of the construction accuracy. It can be used to guide the linear construction of bridges.
【學位授予單位】：河北工程大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U445.4;U448.23

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