本文選題：預(yù)應(yīng)力筋束 + 施工誤差　； 參考：《重慶交通大學(xué)》2014年碩士論文

【摘要】：預(yù)應(yīng)力是預(yù)應(yīng)力結(jié)構(gòu)的生命線，預(yù)應(yīng)力鋼材的松弛對(duì)結(jié)構(gòu)長(zhǎng)期使用性能影響甚巨。目前國(guó)內(nèi)外對(duì)單根預(yù)應(yīng)力筋的松弛研究已經(jīng)比較成熟。然而在實(shí)際結(jié)構(gòu)中預(yù)應(yīng)力筋往往成束使用，由于施工誤差等因素造成預(yù)應(yīng)力筋束內(nèi)各根預(yù)應(yīng)力筋錨固初應(yīng)力并不均勻。預(yù)應(yīng)力筋的松弛率對(duì)初應(yīng)力水平非常敏感，整束預(yù)應(yīng)力筋初應(yīng)力非均勻分布特性對(duì)筋束松弛損失的影響尚不明確，在現(xiàn)有預(yù)應(yīng)力結(jié)構(gòu)設(shè)計(jì)規(guī)范和設(shè)計(jì)實(shí)踐中也未予重視和考慮。本文針對(duì)上述問題，，基于施工現(xiàn)場(chǎng)實(shí)測(cè)數(shù)據(jù)展開數(shù)值模擬和參數(shù)分析，完成的主要工作如下： ①介紹了目前預(yù)應(yīng)力張拉施工技術(shù)規(guī)范和現(xiàn)狀，剖析了傳統(tǒng)張拉施工技術(shù)存在的問題和預(yù)應(yīng)力筋張拉質(zhì)量存在的隱患（同束預(yù)應(yīng)力不均勻和同斷面預(yù)應(yīng)力不均勻），并指出預(yù)應(yīng)力筋同束不均勻?qū)︻A(yù)應(yīng)力松弛損失計(jì)算的影響。 ②基于施工現(xiàn)場(chǎng)預(yù)應(yīng)力筋束張拉錨固時(shí)錨下有效預(yù)應(yīng)力實(shí)測(cè)數(shù)據(jù)，采用隨機(jī)數(shù)生成方法模擬預(yù)應(yīng)力筋束錨固初應(yīng)力的非均勻分布特性，利用單根預(yù)應(yīng)力筋松弛損失規(guī)律對(duì)非均勻預(yù)應(yīng)力筋束的松弛損失進(jìn)行了研究，得出由預(yù)應(yīng)力筋束內(nèi)各單根力筋非均勻初應(yīng)力計(jì)算的總松弛損失與由平均初應(yīng)力計(jì)算的總松弛損失的比值和離散系數(shù)之間的非線性關(guān)系，并用多項(xiàng)式進(jìn)行擬合。 ③將非均勻預(yù)應(yīng)力筋束非線性松弛損失的擬合結(jié)果應(yīng)用到實(shí)際的預(yù)應(yīng)力混凝土連續(xù)剛構(gòu)橋施工及成橋使用階段結(jié)構(gòu)仿真中，用橋梁博士進(jìn)行建模計(jì)算。將表征預(yù)應(yīng)力筋束不均勻度的離散系數(shù)轉(zhuǎn)換為預(yù)應(yīng)力筋的松弛率分別對(duì)模型進(jìn)行計(jì)算和參數(shù)分析，考查不同的松弛率下各施工階段在各控制截面的上、下邊緣應(yīng)力、截面開裂彎矩、以及收縮徐變下的成橋階段主梁撓度的變化情況。 ④介紹了有效預(yù)應(yīng)力檢測(cè)系統(tǒng)以及預(yù)應(yīng)力施工質(zhì)量驗(yàn)收評(píng)估體系和檢測(cè)的頻率統(tǒng)計(jì)標(biāo)準(zhǔn)，以及針對(duì)不合格的預(yù)應(yīng)力筋提出了相應(yīng)的補(bǔ)救措施。另外，針對(duì)同束預(yù)應(yīng)力筋及同斷面預(yù)應(yīng)力筋的不均勻度建議使用新的系統(tǒng)的梳編穿束的方法，并在實(shí)際的橋梁中對(duì)該措施進(jìn)行了驗(yàn)證。
[Abstract]:Prestress is the lifeline of prestressed structure, and the relaxation of prestressed steel has a great influence on the long-term performance of the structure. At present, the research on relaxation of single prestressed tendons at home and abroad has been relatively mature. However, in practical structures, prestressed tendons are often used in bundles, and the initial stress of anchoring of prestressed tendons in prestressed tendons is not uniform due to construction errors and other factors. The relaxation rate of prestressed tendons is very sensitive to the initial stress level. The effect of the non-uniform distribution of initial stress on the relaxation loss of prestressed tendons is not clear, and has not been paid much attention to and taken into account in the existing design code and practice of prestressed structures. In order to solve the above problems, numerical simulation and parameter analysis are carried out based on the measured data of the construction site. The main work accomplished is as follows: The main contents are as follows: 1. The technical specifications and present situation of prestressed tensioning construction are introduced. This paper analyzes the problems existing in the traditional tensioning construction technology and the hidden trouble of the tensioning quality of the prestressed tendons (uneven prestress of the same bundle and uneven prestress of the same section), and points out the influence of the inhomogeneity of the prestressing tendons on the calculation of the relaxation loss of the prestressed tendons. Based on the measured data of the effective prestress under the anchor during the tensioning and anchoring of the prestressed tendons in the construction site, the random number generation method is used to simulate the non-uniform distribution of the initial stress in the anchoring of the prestressed tendons. The relaxation loss of non-uniform prestressed tendons is studied by using the relaxation loss law of single prestressed tendons. The nonlinear relationship between the ratio of the total relaxation loss calculated from the non-uniform initial stress of the prestressing tendons and the total relaxation loss calculated by the average initial stress and the discrete coefficient is obtained and fitted by polynomial. (3) the fitting results of nonlinear relaxation loss of non-uniform prestressed tendons are applied to the structural simulation of prestressed concrete continuous rigid frame bridges in construction and service stage, and the bridge doctor is used to model and calculate. The discrete coefficient which represents the unevenness of prestressing tendons is converted into the relaxation rate of prestressed tendons. The model is calculated and the parameters are analyzed respectively. The stress at the upper and lower edge of each control section in each construction stage under different relaxation rates is examined. The crack moment of the section and the deflection of the main beam under the shrinkage and creep of the bridge. 4. The effective prestress detection system, the acceptance evaluation system of prestressed construction quality and the frequency statistical standard of the inspection are introduced, and the corresponding remedial measures for the unqualified prestressed tendons are put forward. In addition, a new systematic combing method is proposed for the uneven degree of prestressing tendons and prestressed tendons in the same section, and the method is verified in practical bridges.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U445.57

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