【摘要】：預(yù)應(yīng)力混凝土連續(xù)（剛構(gòu)）箱梁橋在近幾十年來(lái)以其結(jié)構(gòu)剛度大、行車(chē)平順舒適、養(yǎng)護(hù)簡(jiǎn)單和施工方法成熟且易為工程單位掌握等一系列優(yōu)勢(shì)而發(fā)展迅速。但在已建成的橋梁中,有相當(dāng)數(shù)量的預(yù)應(yīng)力混凝土箱梁橋在施工過(guò)程中或使用過(guò)程中出現(xiàn)一系列橋梁病害；橋梁病害中尤以箱梁腹板斜裂縫的產(chǎn)生和發(fā)展較為普遍，腹板斜裂縫直接危及橋梁的耐久性和安全性。豎向預(yù)應(yīng)力損失過(guò)大或失效是導(dǎo)致混凝土箱梁橋腹板開(kāi)裂的主要原因之一；因此采用一種方便、有效的檢測(cè)方法控制豎向預(yù)應(yīng)力筋的有效應(yīng)力，是改善豎向預(yù)應(yīng)力筋的張拉質(zhì)量防止腹板開(kāi)裂的一個(gè)重要措施。本文以振動(dòng)測(cè)試法為重點(diǎn)研究?jī)?nèi)容，并應(yīng)用振動(dòng)測(cè)試法在橋梁現(xiàn)場(chǎng)對(duì)預(yù)應(yīng)力筋張拉質(zhì)量進(jìn)行控制，取得了一些研究成果，所進(jìn)行的研究工作及成果如下： 首先，基于接觸剛度的概念，分離正比接觸應(yīng)力，建立多種分析模型，比較其對(duì)錨墊板傾斜角的敏感程度。在室內(nèi)模型和多座箱梁橋現(xiàn)場(chǎng)k-T關(guān)系曲線(xiàn)標(biāo)定試驗(yàn)中，驗(yàn)證了錨墊板不同程度的傾斜度影響特征系數(shù)k值，，加工傾斜度為0°、1°、2°、3°、4°五種錨墊板進(jìn)行室內(nèi)試驗(yàn)，以定量確定傾斜度對(duì)k值影響程度，提出對(duì)錨墊板傾斜角的修正方法。其次，研究特征系數(shù)與張拉力關(guān)系曲線(xiàn)試驗(yàn)方法，為標(biāo)定試驗(yàn)預(yù)應(yīng)力筋中有效力的計(jì)算提供理論依據(jù)；通過(guò)室內(nèi)模型試驗(yàn)驗(yàn)證標(biāo)定試驗(yàn)方法的可靠性和穩(wěn)定性。最后，應(yīng)用豎向預(yù)應(yīng)力筋張拉力振動(dòng)測(cè)試方法測(cè)試了多座橋梁的豎向預(yù)應(yīng)力筋張拉力，獲得反映豎向預(yù)應(yīng)力張拉質(zhì)量現(xiàn)狀的定量評(píng)估數(shù)據(jù)，有效地消除了人為因素，測(cè)試數(shù)據(jù)表明張拉質(zhì)量有明顯提高，證明了振動(dòng)測(cè)試方法的可靠性。擬定了相應(yīng)檢測(cè)流程和合格標(biāo)準(zhǔn)，以有效保證預(yù)應(yīng)力筋的張拉質(zhì)量。
[Abstract]:In recent decades, prestressed concrete continuous (rigid frame) box girder bridge has developed rapidly because of its large structural stiffness, smooth and comfortable driving, simple maintenance and mature construction method, which is easy to be mastered by engineering units. However, in the built bridges, a considerable number of prestressed concrete box girder bridges appear a series of bridge diseases in the construction process or in the process of use. The occurrence and development of oblique cracks in the web of box girder are more common in bridge diseases, and the oblique cracks in webs directly endanger the durability and safety of bridges. Excessive loss or failure of vertical prestress is one of the main causes of web cracking of concrete box girder bridge. Therefore, it is an important measure to improve the tensile quality of vertical prestress tendons to prevent web cracking by using a convenient and effective detection method to control the effective stress of vertical prestressed tendons. In this paper, the vibration test method is taken as the research content, and the vibration test method is used to control the tensile quality of prestressed tendons in the bridge site, and some research results are obtained. The research work and results are as follows: first, Based on the concept of contact stiffness, the proportional contact stress is separated, and a variety of analytical models are established to compare the sensitivity of the contact stiffness to the inclination angle of the anchor gasket. In the indoor model and the calibration test of k 鈮

本文編號(hào)：2496186