本文關(guān)鍵詞：基于多階頻率擬合法監(jiān)測(cè)短粗拉索索力的研究與應(yīng)用　出處：《長(zhǎng)安大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 單索振動(dòng) 短粗索 多階頻率擬合 索力監(jiān)測(cè)

【摘要】：索力監(jiān)測(cè)已成為橋梁健康監(jiān)測(cè)的重要內(nèi)容，準(zhǔn)確的索力信息為施工監(jiān)控、成橋驗(yàn)收、運(yùn)營(yíng)管理、科學(xué)養(yǎng)護(hù)等環(huán)節(jié)提供直接依據(jù)。目前一種高效、經(jīng)濟(jì)和便捷的索力測(cè)試方法是基于弦模型理論的實(shí)測(cè)索體振動(dòng)頻率識(shí)別索力的方法。但實(shí)際應(yīng)用中，對(duì)于直徑≥44mm，長(zhǎng)度直徑比≤100的短粗索，受到邊界約束條件，結(jié)構(gòu)整體剛度的影響，此方法難以進(jìn)行精確的索力監(jiān)測(cè)。針對(duì)此不足，本文以渭河大橋單塔無(wú)背索斜拉橋索力測(cè)試為研究背景，研究基于多階頻率擬合法監(jiān)測(cè)拉索索力的方法。完成的工作內(nèi)容有： （1）利用數(shù)值分析計(jì)算，基于索振動(dòng)理論，考慮不同邊界條件和索剛度的影響，對(duì)單索振動(dòng)時(shí)頻率超越方程進(jìn)行數(shù)值求解，擬合出了不同邊界條件下索力關(guān)于各階振動(dòng)頻率的實(shí)用計(jì)算公式,作為實(shí)際應(yīng)用的參考公式。 （2）建立拉索振動(dòng)模型，針對(duì)各種比例短粗索在不同索力下的振動(dòng)試驗(yàn)，采用快速傅里葉變換與頻譜分析獲得短索的多階頻率，基于試驗(yàn)結(jié)果建立多階頻率優(yōu)化擬合索力的計(jì)算公式。監(jiān)測(cè)計(jì)算結(jié)果顯示其有很高的監(jiān)測(cè)精度和適用性，可以解決短粗索索力監(jiān)測(cè)受邊界約束條件及拉索剛度影響等問題。 （3）建立拉索動(dòng)力特性測(cè)試系統(tǒng)：基于單塔無(wú)背索斜拉橋拉索的特性，結(jié)合現(xiàn)場(chǎng)工程實(shí)際經(jīng)驗(yàn)，通過對(duì)傳感器子系統(tǒng)各項(xiàng)性能參數(shù)的研究，提出對(duì)傳感器、采集設(shè)備、激振裝置及監(jiān)測(cè)軟件等動(dòng)力測(cè)試系統(tǒng)的選擇建議。 （4）利用多階頻率優(yōu)化擬合索力監(jiān)測(cè)方法，，對(duì)寶雞市單塔無(wú)背索斜拉橋施工過程中索力進(jìn)行監(jiān)測(cè)，實(shí)用公式和多階頻率擬合公式監(jiān)測(cè)索力結(jié)果對(duì)比顯示：①當(dāng)索力較小時(shí)可能出現(xiàn)近10%誤差，但通過計(jì)算，利用除基頻以外的高階頻率計(jì)算，仍可以得到較為理想的效果；②索力不很低時(shí)，采用擬合的實(shí)用公式能夠滿足工程需要的精度，誤差均可以控制在3%以內(nèi)。所以驗(yàn)證了基于多階頻率優(yōu)化擬合索力監(jiān)測(cè)方法可行性和準(zhǔn)確性，對(duì)本項(xiàng)目的安全實(shí)施起到指導(dǎo)作用，并對(duì)同類型的項(xiàng)目的索力監(jiān)測(cè)起到借鑒作用。
[Abstract]:Cable force monitoring has become an important part of bridge health monitoring, accurate cable force information for bridge construction monitoring, inspection, operation and management, provide a direct basis for scientific maintenance and other aspects. At present, an efficient, economical and convenient cable tension test method is the theory of string model of the measured cable vibration frequency identification of cable force based on the practical application. However, for larger than 44mm in diameter, length diameter ratio less than 100 short cable, by boundary constraints, affect the overall stiffness of the structure, this method is difficult to carry out accurate monitoring of cable force. To solve this problem, this paper takes Weihe bridge of single tower cable stress test on the background of cable-stayed bridge the dorsal funiculus, research methods based on multi frequency fitting monitoring cable force. The working contents are:
(1) analysis by numerical calculation based on the vibration theory of cable, taking into account the influence of different boundary conditions and the stiffness of cable, the single cable vibration frequency beyond the equations are solved numerically fitted calculation formula under different boundary conditions of cable force on the vibration frequency, as a reference formula for practical application.
(2) the establishment of cable vibration model of cable vibration test in different cable force under various proportion of stubby, multi frequency analysis of short cable using the fast Fu Liye transform and spectrum test results to establish the formula of frequency optimization based on cable force monitoring. Results showed that the monitoring accuracy and applicability very high, can solve the problem of short cabletension monitoring affected by boundary conditions and cable stiffness.
(3) the establishment of cable dynamic characteristics testing system: characteristics of cable Backstays based on single tower, combined with the actual experience of on-site engineering, through the research on the performance parameters of the sensor subsystem, the sensor acquisition equipment, recommended to choose the excitation device and monitoring software of the dynamic testing system.
(4) the frequency of monitoring cable force optimization fitting method for Baoji city of single tower cable force monitoring of cable-stayed bridge in the construction process of the dorsal funiculus, results show that the cable force practical formula and multi frequency fitting formula monitoring: when the cable force is relatively small, may be nearly 10% error, but through calculation. The calculation of higher-order frequency except the fundamental frequency by outside, still can get ideal effect; the cable force is not very low, the utility of fitting the formula can satisfy the engineering requirements of the precision, error can be controlled within 3%. So to verify the order frequency optimization fitting based on cable force monitoring method of feasibility and veracity. The project safety implementation plays a guiding role, and the same type of project of cable force monitoring play a role in drawing.

【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U446;U448.27

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本文編號(hào)：1424653