【摘要】：本文以某預(yù)應(yīng)力連續(xù)剛構(gòu)橋梁為工程背景,詳細(xì)闡述了應(yīng)力監(jiān)控中應(yīng)力監(jiān)測(cè)的方法,分別采用Midas FEA和Midas civil建立實(shí)體有限元模型和桿系有限元模型對(duì)橋梁進(jìn)行仿真分析對(duì)比,并采用Midas FEA進(jìn)行應(yīng)力監(jiān)測(cè)中理論應(yīng)力的計(jì)算。結(jié)合實(shí)際工程應(yīng)力監(jiān)測(cè)過(guò)程和理論計(jì)算分析,對(duì)測(cè)試儀器、溫度、收縮徐變、水化熱、混凝土凝縮、剪力滯效應(yīng)、監(jiān)測(cè)方法造成的應(yīng)力誤差進(jìn)行了詳細(xì)的分析,將應(yīng)力監(jiān)測(cè)結(jié)果誤差分析的方法應(yīng)用到了實(shí)際工程中的應(yīng)力監(jiān)測(cè)結(jié)果處理中,驗(yàn)證了方法的正確性。在施工現(xiàn)場(chǎng)進(jìn)行縱向預(yù)應(yīng)力筋錨固時(shí)預(yù)應(yīng)力損失的實(shí)驗(yàn)研究,得到了不同鋼束形式、不同鋼束長(zhǎng)度及不同張拉錨固速度下錨固時(shí)預(yù)應(yīng)力損失的實(shí)測(cè)值。在傳感器上不設(shè)置墊板、設(shè)置錐面墊板和設(shè)置平面墊板的三種布置形式下,進(jìn)行了擰扭錨固工藝張拉豎向預(yù)應(yīng)力筋錨固時(shí)預(yù)應(yīng)力損失的實(shí)驗(yàn)研究,得出相同的擰扭力矩值下,設(shè)置錐面墊板的布置形式的錨固時(shí)預(yù)應(yīng)力損失最大。進(jìn)行了不同擰扭力矩值下的錨固時(shí)預(yù)應(yīng)力損失實(shí)驗(yàn),得到錨固時(shí)預(yù)應(yīng)力損失值隨著擰扭力矩值增大而減小的主要原因是擰扭力矩值的增大有效地減少了預(yù)應(yīng)力筋的回縮損失,而不是有效地增加了附加預(yù)應(yīng)力。通過(guò)實(shí)驗(yàn)研究,結(jié)合施工現(xiàn)場(chǎng)的情況,給出了現(xiàn)場(chǎng)施工的合理擰扭力矩值。
[Abstract]:In this paper, a prestressed continuous rigid frame bridge is used as the engineering background, and the method of stress monitoring in the stress monitoring is described in detail. The finite element model and the finite element model of the solid finite element model and the finite element model of the rod system are respectively used to compare the simulation and analysis of the bridge. And the calculation of the theoretical stress in the stress monitoring is carried out by using the Midas FEA. The stress error caused by the method, temperature, shrinkage and creep, hydration heat, concrete condensation, shear lag effect and monitoring method is analyzed in detail based on the actual engineering stress monitoring process and the theoretical calculation. The method of the stress monitoring result error analysis is applied to the stress monitoring result processing in the practical engineering, and the correctness of the method is verified. The experimental study of the prestress loss at the time of the longitudinal prestressed bar anchorage at the construction site has obtained the measured values of the prestress loss in the form of different steel beams, the length of different steel beams and the anchoring at different tension and anchoring speeds. in that three arrangement form of a base plate, a conical surface plate and a plane base plate which are not provided on the sensor, The prestress loss is the greatest in the case of an anchor in the form of an arrangement for setting the cone plate. The main cause of the decrease of the prestress loss value when the torsion moment value is increased is that the increase of the torque value is effectively reduced by the increase of the torque value, Rather than effectively adding additional pre-stressing. Through the experimental study, the reasonable torque value of the site construction is given in combination with the situation of the construction site.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U448.23;U441

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