【摘要】：目前,大面積大柱網(wǎng)預(yù)應(yīng)力混凝土框架結(jié)構(gòu)的相關(guān)設(shè)計(jì)理論已日趨成熟,施工工藝問題也已基本解決,但相關(guān)的施工理論與技術(shù)方面,尚未見有深入的研究。特別是施工期結(jié)構(gòu)受力狀態(tài)與變形的分析和控制,以及大跨度預(yù)應(yīng)力框架梁的張拉控制等方面。本文依托寶雞南站站房工程,深入開展后張預(yù)應(yīng)力空間框架結(jié)構(gòu)長大連續(xù)梁的張拉控制技術(shù)研究。圍繞大跨度預(yù)應(yīng)力混凝土框架梁張拉控制難的問題,主要開展了以下工作:首先,分析了后張預(yù)應(yīng)力框架梁在張拉階段中預(yù)應(yīng)力損失的影響因素,總結(jié)了現(xiàn)行規(guī)范中未涉及的由梁側(cè)加腋和剛性柱側(cè)向約束引起的預(yù)應(yīng)力損失的理論分析方法。以站房B區(qū)主體結(jié)構(gòu)中E-9~E-10梁段為例,計(jì)算了其在施工過程中的預(yù)應(yīng)力損失,為后期的仿真分析和現(xiàn)場監(jiān)測提供了理論依據(jù)。然后,選取站房B區(qū)主體結(jié)構(gòu)中位于E軸的連續(xù)9跨預(yù)應(yīng)力框架梁作為分析對象,運(yùn)用ANSYS有限元軟件分析了不同施工順序?qū)蚣芰簝?nèi)有效預(yù)壓力和變形的影響。最后,以E-9~E-10梁段為控制對象,對其在張拉過程中的預(yù)應(yīng)力筋伸長量、梁體反拱值以及梁體控制截面應(yīng)變進(jìn)行了理論分析計(jì)算。并通過現(xiàn)場監(jiān)測的方法來保證張拉效果。通過以上理論研究和現(xiàn)場監(jiān)測,測試結(jié)果表明該預(yù)應(yīng)力工程施工質(zhì)量安全可靠,可為類似工程提供借鑒作用。
[Abstract]:At present, the design theory of large-area large column net prestressed concrete frame structure has matured day by day, the construction technology problem has also been solved basically, but the related construction theory and technology aspect, have not seen the in-depth research. Especially, the analysis and control of the stress state and deformation of the structure during the construction period, as well as the tension control of the long-span prestressed frame beam and so on. In this paper, based on the station project of Baoji South Station, the tension control technology of long-span continuous beam with post-tensioned prestressed space frame structure is studied deeply. Around the difficult problem of tension control of long-span prestressed concrete frame beam, the main work is as follows: firstly, the influence factors of prestressing loss in the tension stage of post-tensioned prestressed frame beam are analyzed. This paper summarizes the theoretical analysis method of prestressing loss caused by lateral restraint of beam side axils and rigid columns, which is not involved in the current code. Taking the E-9~E-10 beam section of the main structure of the station building B as an example, the prestress loss in the construction process is calculated, which provides a theoretical basis for the later simulation analysis and on-the-spot monitoring. Then, the continuous 9-span prestressed frame beam with E axis in the main structure of B area of the station building is selected as the analysis object, and the influence of different construction sequence on the effective pre-pressure and deformation in the frame beam is analyzed by using ANSYS finite element software. Finally, taking the E-9~E-10 beam segment as the control object, the theoretical analysis and calculation of the length of the prestressed tendons, the arch value of the beam body and the strain of the controlled section of the beam during the tension process are carried out. And through the on-the-spot monitoring method to ensure the tension effect. Through the above theoretical research and on-the-spot monitoring, the test results show that the construction quality of the prestressed project is safe and reliable, and it can be used for reference for similar projects.
【學(xué)位授予單位】：石家莊鐵道大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U445.57

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