本文選題：隱蔽工程結(jié)構(gòu) + 損傷識(shí)別方法��； 參考：《上海大學(xué)》2014年博士論文

【摘要】：土木工程結(jié)構(gòu)一般可分為兩大部分：一部分是可以直接接觸和觀測(cè)的部分,稱(chēng)之為暴露工程結(jié)構(gòu)；另一部分是無(wú)法直接接觸和觀測(cè)的部分,稱(chēng)之為隱蔽工程結(jié)構(gòu)。隱蔽工程結(jié)構(gòu)是大型土木工程結(jié)構(gòu)的重要組成部分,在整個(gè)結(jié)構(gòu)中具有極其重要的地位。但由于隱蔽工程結(jié)構(gòu)位置比較隱蔽,其損傷不易被識(shí)別,已成為土木工程結(jié)構(gòu)不可忽視的潛伏安全隱患。如果能夠及早識(shí)別出隱蔽工程結(jié)構(gòu)的損傷(特別是早期損傷),就可以對(duì)整個(gè)工程結(jié)構(gòu)進(jìn)行比較準(zhǔn)確的安全評(píng)估,從而可以避免巨額基礎(chǔ)設(shè)施蒙受重大的損失。因此,如何對(duì)隱蔽工程結(jié)構(gòu)進(jìn)行損傷診斷,包括確定隱蔽工程結(jié)構(gòu)是否存在損傷、結(jié)構(gòu)的損傷位置、損傷程度和損傷變化趨勢(shì),成為大型工程結(jié)構(gòu)健康監(jiān)測(cè)和安全評(píng)估系統(tǒng)最重要的問(wèn)題。為此,本文在浙江省教育廳科研項(xiàng)目“環(huán)境激勵(lì)下的結(jié)構(gòu)損傷與荷載同步識(shí)別方法研究”(項(xiàng)目批準(zhǔn)號(hào)：Y201223039)和橋梁工程安全控制技術(shù)與裝備湖南省工程技術(shù)研究中心開(kāi)放基金項(xiàng)目“基于支持向量機(jī)法橋梁沖刷損傷識(shí)別方法及其應(yīng)用研究”(項(xiàng)目批準(zhǔn)號(hào)：13KC05)的資助下對(duì)基于振動(dòng)特性的隱蔽工程結(jié)構(gòu)的損傷識(shí)別方法開(kāi)展了相關(guān)探索性的研究,主要對(duì)隱蔽工程結(jié)構(gòu)損傷識(shí)別方法的基本理論進(jìn)行了研究,重點(diǎn)應(yīng)用高效模態(tài)應(yīng)變能、小波分析、子結(jié)構(gòu)、時(shí)變自回歸滑動(dòng)平均模型、支持向量機(jī)和自適應(yīng)卡爾曼濾波等對(duì)隱蔽工程結(jié)構(gòu)損傷診斷方法進(jìn)行了探索性的研究。論文的主要研究工作如下： (1)建立了基于高效模態(tài)應(yīng)變能的隱蔽工程結(jié)構(gòu)損傷識(shí)別方法。該方法摒棄了使用連續(xù)低階模態(tài)對(duì)結(jié)構(gòu)進(jìn)行損傷識(shí)別的傳統(tǒng)方法,而選用可不連續(xù)的高效模態(tài)進(jìn)行結(jié)構(gòu)損傷識(shí)別。首先,詳細(xì)推導(dǎo)了根據(jù)結(jié)構(gòu)損傷前后特征值變化率來(lái)選擇高效模態(tài)的理論方程,選擇的高效模態(tài)具有對(duì)損傷前后結(jié)構(gòu)的單元應(yīng)變能變化靈敏度較高的特點(diǎn)。在此基礎(chǔ)上,建立高效模態(tài)下隱蔽工程結(jié)構(gòu)的損傷判別指標(biāo)和損傷識(shí)別方程；最后,對(duì)高效模態(tài)的損傷識(shí)別靈敏度和魯棒性進(jìn)行了研究。為驗(yàn)證該方法的有效性,對(duì)一海洋結(jié)構(gòu)中隱蔽工程結(jié)構(gòu)單一損傷和多處損傷在不同噪音工況下的損傷診斷效果進(jìn)行了深入研究。 (2)建立了基于小波分析的隱蔽結(jié)構(gòu)損傷識(shí)別方法。該方法把小波分析技術(shù)與高效模態(tài)有機(jī)結(jié)合起來(lái)對(duì)結(jié)構(gòu)小損傷進(jìn)行診斷,彌補(bǔ)了單一損傷動(dòng)力指紋對(duì)結(jié)構(gòu)損傷識(shí)別可能產(chǎn)生漏判和精度不能保證的不足。主要應(yīng)用單元模態(tài)應(yīng)變能對(duì)結(jié)構(gòu)小損傷的敏感性、小波分析技術(shù)高效的局部分析能力對(duì)結(jié)構(gòu)小損傷位置進(jìn)行識(shí)別。在此基礎(chǔ)上,應(yīng)用損傷識(shí)別方程對(duì)隱蔽結(jié)構(gòu)的損傷程度進(jìn)行診斷。為了驗(yàn)證該方法的有效性,應(yīng)用數(shù)值模擬和工程實(shí)例對(duì)該方法的識(shí)別程序、識(shí)別效果、影響因素等進(jìn)行了深入研究。 (3)建立了基于相對(duì)子結(jié)構(gòu)界面參數(shù)的隱蔽結(jié)構(gòu)損傷識(shí)別方法,該方法主要利用相對(duì)子結(jié)構(gòu)界面參數(shù)對(duì)結(jié)構(gòu)損傷的敏感性來(lái)識(shí)別隱蔽工程結(jié)構(gòu)的損傷。該部分重點(diǎn)對(duì)結(jié)構(gòu)界面參數(shù)識(shí)別理論、隱蔽結(jié)構(gòu)損傷和子結(jié)構(gòu)界面參數(shù)變化的對(duì)應(yīng)關(guān)系、隱蔽工程結(jié)構(gòu)損傷位置和程度識(shí)別、識(shí)別方法的魯棒性等進(jìn)行了深入研究。 (4)建立了基于ARMA和SVM的結(jié)構(gòu)損傷識(shí)別方法。該方法結(jié)合了時(shí)變自回歸滑動(dòng)平均模型(ARMA)與支持向量機(jī)(SVM)優(yōu)點(diǎn),解決了環(huán)境激勵(lì)下結(jié)構(gòu)健康檢測(cè)信號(hào)存在非平穩(wěn)性和損傷樣本非常有限的問(wèn)題。重點(diǎn)對(duì)ARMA與SVM相結(jié)合的損傷識(shí)別理論、大型工程結(jié)構(gòu)在環(huán)境激勵(lì)下隱蔽工程結(jié)構(gòu)損傷識(shí)別程序、識(shí)別精度和該方法的魯棒性等進(jìn)行了深入研究。 (5)建立了基于自適應(yīng)卡爾曼濾波的子結(jié)構(gòu)損傷識(shí)別方法。該方法結(jié)合了自適應(yīng)卡爾曼濾波和子結(jié)構(gòu)的優(yōu)點(diǎn),解決了環(huán)境激勵(lì)下單獨(dú)應(yīng)用相對(duì)子結(jié)構(gòu)界面參數(shù)無(wú)法對(duì)隱蔽工程結(jié)構(gòu)和暴露工程結(jié)構(gòu)同時(shí)識(shí)別的問(wèn)題。主要對(duì)自適應(yīng)卡爾曼濾波算法理論、利用自適應(yīng)卡爾曼濾波對(duì)子結(jié)構(gòu)損傷診斷方法、遺忘因子確定方法、用該方法進(jìn)行損傷診斷的識(shí)別精度和魯棒性等問(wèn)題開(kāi)展了探索性研究。
[Abstract]:A civil engineering structure can be divided into two parts: part of which can be directly exposed and observed, which is known as exposure engineering structure, and the other is a part that can not be directly contacted and observed, which is called a concealed engineering structure. But because the location of the concealed engineering structure is relatively concealed and its damage is not easily recognized, it has become a latent security hidden danger in civil engineering structure. If it can identify the damage of the hidden engineering structure (especially early damage), it can make a more accurate safety assessment of the whole engineering structure. Therefore, it is the most important problem for the health monitoring and safety assessment system of large engineering structures to diagnose the damage of the hidden engineering structure, including the determination of the damage of the concealed engineering structure, the damage position of the structure, the degree of damage and the trend of damage change. "Study on the method of structural damage and load synchronization identification under the environment inspired by environmental incentives" (project approval number: Y201223039) and bridge engineering safety control technology and equipment of the Hunan Province Engineering Technology Research Center open fund project "bridge scour identification method and its application based on support vector machine method" in Zhejiang Province education department research project Research on the damage identification method of concealed engineering structure based on vibration characteristics (project approval number: 13KC05), the basic theory of the damage identification method of concealed engineering structure is mainly studied. The emphasis is on the application of high efficient modal stress, wavelet analysis, substructure, and time-varying autoregressive sliding. The average model, support vector machine (SVM) and adaptive Calman filter (adaptive) and other methods have been studied. The main research work of this paper is as follows:
(1) the damage identification method of concealed engineering structure based on high efficient mode strain energy is established. The method abandons the traditional method of using continuous low order mode to identify the damage of structure, and selects structural damage identification with discontinuous efficient modes. First, the selection of the change rate of eigenvalues before and after the structural damage is derived in detail. The theoretical equation of high efficiency mode and the high efficient mode selected have the characteristic of high sensitivity to the change of element strain energy before and after the damage. On this basis, the damage identification index and damage identification equation of the concealed engineering structure under high efficiency mode are established. Finally, the sensitivity and robustness of the damage identification of the high efficiency mode is studied. In order to verify the effectiveness of this method, the damage diagnosis effect of the single damage and multiple damage of the hidden engineering structure in a marine structure under different noise conditions is studied in depth.
(2) a method of identifying the damage of hidden structures based on wavelet analysis is established. This method combines the wavelet analysis technique with the efficient mode to diagnose the small structural damage, and makes up for the deficiency of the single damage dynamic fingerprint on the structural damage identification. The sensitivity of small damage, the local analysis ability of the wavelet analysis technique to identify the small damage position of the structure. On this basis, the damage identification equation is used to diagnose the damage degree of the hidden structure. In order to verify the effectiveness of the method, the recognition program of the method is applied to the recognition program of the method and the engineering example. Fruit, influencing factors and so on have been studied in depth.
(3) a hidden structure damage identification method based on the relative substructure interface parameters is established. The method mainly uses the sensitivity of the relative substructure interface parameters to the structural damage to identify the damage of the hidden engineering structure. This part focuses on the theory of the identification of the structural interface parameters, the damage of the hidden structure and the corresponding changes in the interface parameters of the substructure. The relationship between concealed engineering structure, location and degree of damage, and robustness of identification methods are deeply studied.
(4) a structural damage identification method based on ARMA and SVM is established. This method combines the advantages of time-varying autoregressive moving average model (ARMA) and support vector machine (SVM). This method solves the problem of non-stationary and very limited damage samples of structural health detection signals under environmental excitation. The emphasis is on the theory of damage identification combined with ARMA and SVM. The damage identification procedure, recognition accuracy and robustness of the engineering structure under Hidden environment are studied in depth.
(5) a substructure damage identification method based on adaptive Calman filter is established. This method combines the advantages of adaptive Calman filter and substructure, and solves the problem of identifying the hidden engineering structure and the exposed engineering structure at the same time by using the relative substructure interface parameters under the environment excitation. The main problem is adaptive Calman. The theory of filtering algorithm, using adaptive Calman filter to diagnose substructure damage, and the method of forgetting factor determination, carry out exploratory research on the recognition accuracy and robustness of damage diagnosis by this method.

【學(xué)位授予單位】：上海大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TU317

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