本文選題：鐵路橋　切入點：平行系桿拱　出處：《鐵道標準設(shè)計》2017年03期 　論文類型：期刊論文

【摘要】：新建商合杭鐵路西苕溪右線特大橋跨越長興港采用1-140 m系桿拱方案,為預應力混凝土平行鋼管混凝土拱橋,采用先拱后梁方法施工。介紹采用無砟軌道時系桿拱設(shè)計方案,并根據(jù)實際施工階段建立有限元模型計算分析,確定結(jié)構(gòu)的合理形式及先拱后梁施工工序,計算拱肋、系梁、吊桿等結(jié)構(gòu)應力、剛度、穩(wěn)定性等設(shè)計參數(shù)。分析結(jié)果表明:(1)該橋主體結(jié)構(gòu)應力、變形等均滿足規(guī)范要求;(2)系桿拱應用于無砟軌道時,靜活載梁端轉(zhuǎn)角引起鋼軌上撥及下壓量宜按1 mm限值控制;(3)先拱后梁系桿拱采用施工階段分批張拉鋼絞線系桿形式,實現(xiàn)無支架施工,滿足不中斷通航要求。
[Abstract]:The new Xitiaoxi railway Xitiaoxi extra large bridge across Changxing Port adopts 1-140m tied arch scheme, which is a prestressed concrete parallel concrete-filled steel tube arch bridge, which is constructed by first arch and then beam. The design scheme of tie arch is introduced when ballastless track is adopted. According to the actual construction stage, the finite element model calculation and analysis are established, the reasonable form of the structure and the construction procedure of the first arch and then the beam are determined, and the stress and stiffness of the arch rib, the tie beam and the suspender are calculated. Stability and other design parameters. The analysis results show that the stress and deformation of the main structure of the bridge meet the requirements of the code, and the tie arch is applied to ballastless track. In order to meet the requirements of uninterrupted navigation, it is advisable to control the rail upper and lower pressure according to the limit of 1 mm due to the angle at the end of the dead load beam. The first arch and then the beam tie bar arch adopt the form of tensioning strands in batches in the construction stage, so as to realize the construction without support and meet the requirements of uninterrupted navigation.
【作者單位】： 中鐵第四勘察設(shè)計院集團有限公司;
【基金】：中鐵第四勘察設(shè)計院集團有限公司科技研究開發(fā)計劃項目(2014K21)
【分類號】：U445.4

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