【摘要】：為解釋客家大橋在體系轉(zhuǎn)換施工過程中結(jié)構(gòu)懸臂端向下的撓度出現(xiàn)先增大后減小這一現(xiàn)象的根本原因,采用Midas-civil有限元軟件建立了該橋梁結(jié)構(gòu)模型用于計算,并利用因素分析法和疊加原理等方法進(jìn)行了系統(tǒng)的分析。發(fā)現(xiàn):連續(xù)梁橋在邊跨合龍后,拆除懸臂使用臨時支承結(jié)構(gòu)的施工過程中,因先拆除的部分臨時支承結(jié)構(gòu)優(yōu)先退出體系,不再參與受力;結(jié)構(gòu)支座支反力重新分配,永久支座與另一半未拆除的臨時支座受力大小發(fā)生改變;體系轉(zhuǎn)換過程中的結(jié)構(gòu)墩梁連接處實際支點的位置發(fā)生變化、永久支座開始受力后產(chǎn)生彈性壓縮變形以及邊跨和龍段區(qū)域內(nèi)預(yù)應(yīng)力作用產(chǎn)生的上拱效應(yīng)等因素使得結(jié)構(gòu)懸臂端的撓度發(fā)生變化,其單獨(dú)作用的效果各不相同,而支點位置移動造成的懸臂長度先增大后減小是出現(xiàn)上述工程現(xiàn)象的根本原因。通過一組對比模型計算得出的理論數(shù)據(jù),繪制了相應(yīng)的曲線圖。通過觀察曲線圖的變化趨勢,總結(jié)出臨時支墩與永久支座的距離對懸臂端撓度以及支座反力影響的規(guī)律,同時擬合出相關(guān)的數(shù)學(xué)函數(shù)。通過上述分析過程,總結(jié)研究成果,得出結(jié)論,并結(jié)合相關(guān)參考文獻(xiàn),提出對同類橋梁施工中選用臨時支座方式、計算橋梁施工預(yù)拱度以及橋梁施工監(jiān)控等具有一定的指導(dǎo)意義的建議。
[Abstract]:In order to explain the fundamental reason why the downward deflection of the cantilever end of the Hakka Bridge increased first and then decreased during the construction of the system transition, the bridge structure model was established by using the Midas-civil finite element software for calculation. The method of factor analysis and superposition principle is used to analyze systematically. It is found that in the construction process of removing the cantilever with temporary support structure after the closure of the side span, the partial temporary support structure that was removed first takes precedence out of the system and no longer takes part in the force, and the reaction force of the support of the structure is redistributed. The force size of the permanent support and the temporary support which is not removed by the other half is changed, and the position of the actual fulcrum in the connection of the structure pier and beam during the system transition is changed. The deflection of the cantilever end of the structure is changed due to the elastic compression deformation of the permanent support and the effect of the upper arch caused by the prestressing action of the side span and the region of the long section after the permanent support is subjected to the force, and the effect of the single action is different. The length of the cantilever caused by the shift of the fulcrum first increases and then decreases, which is the root cause of the above engineering phenomenon. Through a set of theoretical data calculated by comparison model, the corresponding curves are drawn. By observing the changing trend of the curve, the influence of the distance between temporary pier and permanent support on the deflection of the cantilever end and the reaction force of the support is summarized, and the relevant mathematical functions are fitted. Through the above analysis process, summarize the research results, draw a conclusion, and combined with the relevant references, put forward the choice of temporary support in the construction of similar bridges, Calculation of pre-arch degree of bridge construction and bridge construction monitoring and control have certain guiding significance.
【作者單位】： 武漢理工大學(xué)土木工程與建筑學(xué)院;
【基金】：國家自然科學(xué)基金項目(51278183)
【分類號】：U445.4

【相似文獻(xiàn)】

相關(guān)期刊論文 前1條

1 景慧萍;因素分析法在公交統(tǒng)計分析中的應(yīng)用[J];城市公共交通;2000年04期

相關(guān)重要報紙文章 前1條

1 陳林邋楊皎;重慶給已建大橋全面“體檢”[N];建筑時報;2007年

，

本文編號：2146122