本文關(guān)鍵詞： 動(dòng)力測試 橋墩 損傷識(shí)別 頻響函數(shù)置信準(zhǔn)則 模型修正　出處：《北京交通大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：橋墩作為支撐上部結(jié)構(gòu)的重要構(gòu)件,其工作狀態(tài)直接影響整個(gè)橋梁的安全�？焖倏煽康拿鞔_墩臺(tái)基礎(chǔ)技術(shù)狀態(tài),科學(xué)的指導(dǎo)墩臺(tái)結(jié)構(gòu)的狀態(tài)評定以及加固維修,對橋梁的運(yùn)營管理有極大意義。本文以現(xiàn)有的基于動(dòng)力測試的結(jié)構(gòu)損傷識(shí)別研究成果為基礎(chǔ),對基于動(dòng)力參數(shù)的鐵路橋墩損傷識(shí)別方法進(jìn)了研究,主要工作和結(jié)論如下： (1)研究了基于模態(tài)參數(shù)和模型修正理論的橋墩損傷識(shí)別方法。在模態(tài)頻率及模態(tài)置信準(zhǔn)則(MAC)的基礎(chǔ)上,引入以一階振型相鄰分量比值構(gòu)造的目標(biāo)函數(shù)。通過數(shù)值分析表明,該方法僅僅應(yīng)用前兩階模態(tài),便可以實(shí)現(xiàn)對橋墩墩身和基礎(chǔ)狀態(tài)的同時(shí)識(shí)別。然而,該方法對模態(tài)識(shí)別精度有較高要求,抗噪能力較差。 (2)研究了基于頻響函數(shù)相似性和模型修正理論的橋墩損傷識(shí)別方法。首次提出了以結(jié)構(gòu)相鄰測點(diǎn)頻響函數(shù)模式置信準(zhǔn)則(SAC)構(gòu)造目標(biāo)函數(shù),通過模型修正對橋墩損傷進(jìn)行識(shí)別的方法。本文通過理論和數(shù)值分析,從頻率段選擇、測點(diǎn)布置、抗噪聲能力幾個(gè)方面對該方法進(jìn)行了探討。分析結(jié)果表明,該方法的損傷識(shí)別結(jié)果準(zhǔn)確可靠,方法具有一定的工程應(yīng)用性。 (3)通過1：3比例縮尺橋墩模型試驗(yàn),進(jìn)一步對基于頻響函數(shù)相似性和模型修正理論的橋墩損傷識(shí)別方法進(jìn)行了實(shí)驗(yàn)研究。在模型橋墩上設(shè)計(jì)了幾種典型的損傷形式,并用所提的損傷識(shí)別方法進(jìn)行了評估。識(shí)別結(jié)果與現(xiàn)場觀測結(jié)果吻合,從而證明了本研究所提橋墩損傷識(shí)別方法的可靠性。
[Abstract]:As an important component of the supporting superstructure, the working state of piers directly affects the safety of the whole bridge. The technical status of pier and abutment foundation is determined quickly and reliably, and the state evaluation and reinforcement of pier and abutment structure are scientifically guided. Based on the existing research results of structural damage identification based on dynamic testing, this paper studies the damage identification method of railway piers based on dynamic parameters. The main work and conclusions are as follows:. In this paper, the damage identification method of pier based on modal parameters and model modification theory is studied. On the basis of modal frequency and modal confidence criterion (Marc), the objective function constructed by the ratio of adjacent components of first-order modes is introduced. The numerical analysis shows that, Using only the first two modes, the method can recognize the pier and foundation state simultaneously. However, the accuracy of modal identification is high and the anti-noise ability is poor. In this paper, the damage identification method of bridge pier based on similarity of frequency response function and model modification theory is studied, and the objective function is constructed by using the confidence criterion of frequency response function (SAC) of adjacent measuring points for the first time. The method of identifying pier damage by model modification is discussed in this paper from the aspects of frequency section selection, measuring point arrangement and anti-noise ability through theoretical and numerical analysis. The result of damage identification is accurate and reliable, and the method has certain engineering application. Based on the model test of 1: 3 scale piers, the damage identification method of bridge pier based on the similarity of frequency response function and model modification theory is further studied. Several typical damage forms are designed on the model pier. The damage identification method proposed in this paper is evaluated, and the result is in agreement with the field observation result, which proves the reliability of the damage identification method proposed in this paper.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U443.22;U446

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