發(fā)布時間：2018-04-30 10:24

  本文選題：預(yù)應(yīng)力缺陷 + 精細(xì)化施工��； 參考：《重慶交通大學(xué)》2015年碩士論文

【摘要】：通過對預(yù)應(yīng)力混凝土箱梁的預(yù)應(yīng)力缺陷對橋梁結(jié)構(gòu)影響的研究,為橋梁預(yù)應(yīng)力施工的重要性提供理論依據(jù),同時為評價預(yù)應(yīng)力缺陷的影響大小提供理論參考。具有重要的理論和現(xiàn)實意義以及廣闊的市場前景和應(yīng)用價值。本文針對預(yù)應(yīng)力混凝土箱梁的預(yù)應(yīng)力缺陷做出了以下研究:在文章的開始階段研究了預(yù)應(yīng)力混凝土箱梁的特點及發(fā)展情況,然后據(jù)此提出其在發(fā)展過程中出現(xiàn)的一些病害,并對引發(fā)病害的原因進(jìn)行了分析。得出結(jié)論,預(yù)應(yīng)力缺陷是引起病害的主要原因之一。所以,研究存在哪些預(yù)應(yīng)力缺陷、預(yù)應(yīng)力缺陷產(chǎn)生的原因、如何控制預(yù)應(yīng)力缺陷以及如何模擬分析預(yù)應(yīng)力缺陷成為本文的研究方向。然后介紹了其中一種預(yù)應(yīng)力缺陷—混凝土箱梁預(yù)應(yīng)力不均勻。明確了預(yù)應(yīng)力不均勻度的概念,提出了使用同束和同斷面不均勻度來評價預(yù)應(yīng)力的不均勻程度。使用數(shù)據(jù)表明在現(xiàn)有施工條件下預(yù)應(yīng)力鋼絞線錨下有效預(yù)應(yīng)力的分布具有嚴(yán)重的非均勻性。引起我們對鋼絞線錨下有效預(yù)應(yīng)力均勻度的重視。然而同束或者同斷面預(yù)應(yīng)力不均勻度并不是唯一可以評判預(yù)應(yīng)力不均勻的標(biāo)準(zhǔn),本文提出使用各單根鋼絞線錨下有效預(yù)應(yīng)力的平均值-均值和各單根鋼絞線錨下有效預(yù)應(yīng)力偏離平均數(shù)的距離的平均數(shù)-離散程度更加能反映鋼絞線錨下有效預(yù)應(yīng)力的不均勻程度。在預(yù)應(yīng)力損失方面,由于缺乏預(yù)應(yīng)力損失與截面應(yīng)力之間關(guān)系的研究,本文首次從應(yīng)力的角度入手,建立有限元模型,使用模型計算并與實測數(shù)據(jù)對比,并對施工階段某截面進(jìn)行受力分析,計算得出預(yù)應(yīng)力損失與截面應(yīng)力之間的關(guān)系,并提出使用殘余率來評價預(yù)應(yīng)力損失的大小。接下來介紹了預(yù)應(yīng)力精細(xì)化施工技術(shù)。這項技術(shù)是目前可以較有效控制施工過程中預(yù)應(yīng)力施工病害的最好方法,在施工中具有重大的意義。主要包含內(nèi)容有:錨具及其安裝就位質(zhì)量控制、鋼束的梳編穿束工藝、預(yù)應(yīng)力張拉施工以及有效預(yù)應(yīng)力檢測控制與智能化系統(tǒng)。
[Abstract]:Through the research on the influence of prestressed concrete box girder on the bridge structure, it provides the theoretical basis for the importance of the bridge prestressed construction, and also provides the theoretical reference for evaluating the influence of the prestressed concrete box girder on the bridge structure. It has important theoretical and practical significance as well as broad market prospect and application value. In this paper, the prestressing defects of prestressed concrete box girder are studied as follows: at the beginning of the article, the characteristics and development of prestressed concrete box girder are studied, and then some diseases in the process of development are put forward. The causes of disease were analyzed. It is concluded that the prestressing defect is one of the main causes of the disease. Therefore, it is the research direction of this paper to study which pre-stress defects exist, the causes of pre-stress defects, how to control the pre-stress defects and how to simulate and analyze the pre-stress defects. Then it introduces one kind of prestressing defect-the non-uniform prestress of concrete box girder. In this paper, the concept of prestress inhomogeneity is defined, and the uneven degree of prestress is evaluated by using the same beam and the same section inhomogeneity. The data show that the distribution of the effective prestress under the anchor of prestressed steel strand under the existing construction conditions has serious inhomogeneity. We attach importance to the effective prestress uniformity under the anchor of steel strand. However, the unevenness of prestress in the same bundle or section is not the only criterion to judge the uneven prestress. In this paper, it is proposed that the average value of effective prestress under each single strand anchor and the average distance between the effective prestress under each single strand anchor and the distance from the average to the average value can better reflect the effective prestressing under the steel strand anchor. The degree of inhomogeneity of the stress. In the aspect of prestress loss, due to the lack of research on the relationship between prestress loss and cross-section stress, the finite element model is established from the angle of stress for the first time, and the model is used to calculate and compare with the measured data. The relationship between prestress loss and section stress is calculated and the residual rate is used to evaluate the size of prestress loss. Then the prestress fine construction technology is introduced. This technique is the best method to control the damage of prestressing force in the construction process, and it is of great significance in construction. The main contents include: quality control of Anchorage and its installation and placement, combing and piercing process of steel strands, prestressing tensioning construction, effective prestress detection, control and intelligent system.
【學(xué)位授予單位】：重慶交通大學(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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本文編號：1824183