本文選題：平行鋼絞線 + 振動頻率法�。� 參考：《長安大學(xué)》2015年碩士論文

【摘要】：平行鋼絞線索由于其構(gòu)造與性能上的技術(shù)優(yōu)勢,是斜拉橋中經(jīng)常采用的拉索形式之一。由多根鋼絞線組成的斜拉索,其成索過程、索力分布與傳統(tǒng)平行鋼絲斜拉索相比具有特殊性,平行鋼絞線斜拉索索力的精確量測,是亟待解決的問題。論文通過收集、分析和總結(jié)有關(guān)平行鋼絞線索的研究資料,以實際工程為背景,通過理論分析、實橋索力監(jiān)測等方法,對平行鋼絞線索力精確量測的方法進(jìn)行研究,主要內(nèi)容有:(1)對斜拉索類型、特點、量測方法和量測理論應(yīng)用現(xiàn)狀進(jìn)行綜合探討。工程實踐表明,采用振動頻率法量測索力是最便捷的方法�；诙喔摻g線拉索的構(gòu)造特點,與傳統(tǒng)振動法頻率量測索力的理論前提存在差異,提出直接采用傳統(tǒng)振動頻率法在平行鋼絞線拉索索力量測過程中存在的問題和不足。(2)研究了斜拉索線性振動理論,考慮斜拉索的抗彎剛度及垂度對拉索振動頻率的影響關(guān)系,對頻率法量測索力的理論計算方法進(jìn)行綜合分析,提出該方法應(yīng)用于平行鋼絞線索力的量測中導(dǎo)致索力量測結(jié)果誤差的影響因素。(3)對影響平行鋼絞線索力的參數(shù)進(jìn)行識別,并對頻率階數(shù)判別的方法進(jìn)行探討,通過對平行鋼絞線索特有的HDPE套筒的影響進(jìn)行分析,提出在索力理論計算時關(guān)于考慮HDPE套筒質(zhì)量的修正方法和頻率階數(shù)選取的建議。(4)結(jié)合平行鋼絞線索的成索施工特點與索力影響性因素,通過對單根鋼絞線張拉力控制的方法,對傳統(tǒng)振動頻率法斜拉索索力量測的理論計算公式進(jìn)行修正,得出適用于平行鋼絞線索力量測的修正計算公式。(5)將修正后的平行鋼絞線索力計算公式,應(yīng)用于依托工程中的索力量測,并對測試索力和計算索力進(jìn)行對比分析,驗證修正公式的正確性。
[Abstract]:Parallel strands are often used in cable-stayed bridges because of their technical advantages in construction and performance.In the process of cable formation, the cable force distribution is special compared with the traditional parallel steel wire cable, and the accurate measurement of the cable force of parallel steel wire cable is an urgent problem to be solved.Through collecting, analyzing and summarizing the research data of parallel steel strands, taking the actual engineering as the background, through theoretical analysis, real bridge cable force monitoring and other methods, the paper studies the method of accurate measurement of parallel steel strand cable force.The main contents are: (1) the types, characteristics, methods of measurement and the current situation of application of measurement theory are comprehensively discussed.Engineering practice shows that measuring cable force by vibration frequency method is the most convenient method.Based on the structural characteristics of many steel strands, there is a difference between the traditional vibration method and the theoretical premise of measuring cable force by frequency measurement.In this paper, the problems and shortcomings of the traditional vibration frequency method in measuring the strength of parallel steel strands are put forward. The linear vibration theory of stay cables is studied. The influence of bending stiffness and sag of cables on the vibration frequency of cables is considered.The theoretical calculation method of measuring cable force by frequency method is analyzed synthetically. It is put forward that this method is applied to the measurement of the cable force of parallel steel strand. The factors that influence the error of cable force measurement result are identified by using this method to identify the parameters that affect the cable force of parallel steel strand.The method of frequency order discrimination is discussed, and the influence of HDPE sleeve, which is characteristic of parallel steel strands, is analyzed.In the calculation of cable force theory, it is proposed to consider the modification method of HDPE sleeve quality and the selection of frequency order. 4) combining with the construction characteristics of parallel steel strands and the influencing factors of cable force, the method of controlling the tension of a single steel strand is put forward.The theoretical calculation formula of traditional vibration frequency method for cable-stayed cable force measurement is revised, and the modified formula for calculating the force of parallel steel strand cable is obtained, which is suitable for the force measurement of parallel steel strand cable. (5) the modified formula for calculating the cable force of parallel steel strand cable is obtained.It is applied to the cable force measurement in relying engineering, and the correctness of the revised formula is verified by comparing the test cable force with the calculated cable force.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U448.27

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本文編號：1762142