發(fā)布時(shí)間：2019-05-29 23:31

【摘要】：隨著近年來(lái)空間大跨度鋼結(jié)構(gòu)的快速發(fā)展，因?yàn)樵薪Y(jié)構(gòu)承載力不足而運(yùn)用FRP（Fiber Reinforced Plastics）加固的鋼結(jié)構(gòu)亦越來(lái)越多，對(duì)大跨度FRP加固鋼結(jié)構(gòu)進(jìn)行界面剝離損傷無(wú)損檢測(cè)，對(duì)于FRP加固鋼結(jié)構(gòu)的養(yǎng)護(hù)維修，保證大型重要鋼結(jié)構(gòu)建筑物加固后的安全性和可靠性具有重要的意義。本文主要研究如何利用瑞利波群速度頻散曲線的變化規(guī)律檢測(cè)出界面剝離損傷長(zhǎng)度。 瑞利波在FRP加固鋼梁的表層傳播時(shí)，瑞利波的頻散特性會(huì)發(fā)生變化，瑞利波速度頻散曲線反應(yīng)了瑞利波的頻散特性。為了研究如何利用瑞利波頻散信息進(jìn)行損傷識(shí)別，文中建立了FRP與鋼材二層介質(zhì)的有限元模型，研究了瑞利波在FRP加固鋼梁表面的產(chǎn)生機(jī)理和傳播特性，并從波場(chǎng)快照中識(shí)別出瑞利波，確定了瑞利面波波場(chǎng)數(shù)值模擬各種影響參數(shù)，模擬了FRP加固鋼梁的界面剝離損傷，介紹了求解瑞利波群速度頻散曲線的互相關(guān)分析法。通過(guò)理論公式求出的瑞利波速與有限元模擬出的瑞利波速的對(duì)比驗(yàn)證有限元模擬的準(zhǔn)確性。 文中對(duì)全跨FRP加固鋼梁進(jìn)行了二維有限元模擬，分析了剝離損傷和鋼梁裂紋對(duì)瑞利波傳播的影響，，進(jìn)行了其對(duì)應(yīng)的瑞利波群速度頻散曲線正演計(jì)算，從中找出了界面剝離損傷與瑞利波群速度頻散曲線變化規(guī)律之間的聯(lián)系。當(dāng)出現(xiàn)界面剝離損傷時(shí)，同一檢波點(diǎn)對(duì)間的瑞利波群速度在一些頻段幅值降低，瑞利波群速度頻散曲線在相應(yīng)頻段內(nèi)呈現(xiàn)向下平移的趨勢(shì)，且界面剝離損傷長(zhǎng)度越大，曲線向下平移量越大；同一結(jié)構(gòu)中不同檢波點(diǎn)對(duì)之間的瑞利波群速度頻散曲線的差異與界面剝離損傷有一定的聯(lián)系。文中使用歐幾里德距離和角分離度度量了頻散曲線間的差異，認(rèn)為當(dāng)兩條曲線的角分離度大于0.9時(shí)，說(shuō)明檢測(cè)過(guò)程采集的數(shù)據(jù)是有效的，相應(yīng)的歐幾里德距離可以作為界面剝離損傷檢測(cè)的指標(biāo)。文中以此為基礎(chǔ)提出了FRP加固鋼梁界面剝離損傷檢測(cè)方法。 文中提出了將歸一化平均歐幾里德距離作為界面剝離損傷程度的檢測(cè)指標(biāo)。建立非全跨FRP加固鋼梁的三維有限元模型，使用基于模型的損傷檢測(cè)方法進(jìn)行FRP加固鋼梁界面剝離損傷的模擬檢測(cè)。分析了最小可檢測(cè)尺寸的三個(gè)影響因素和文中檢測(cè)方法的比較優(yōu)勢(shì)。
[Abstract]:With the rapid development of space long-span steel structure in recent years, more and more steel structures strengthened by FRP (Fiber Reinforced Plastics) are strengthened because of the insufficient bearing capacity of the original structure. Nondestructive testing of interfacial peeling damage of long-span FRP strengthened steel structure is carried out. It is of great significance for the maintenance and maintenance of steel structures strengthened with FRP to ensure the safety and reliability of large and important steel structure buildings. In this paper, how to detect the interfacial peeling damage length by using the variation law of the velocity dispersion curve of the Rayleigh wave group is studied. When the Rayleigh wave propagates on the surface of the steel beam strengthened by FRP, the dispersion characteristics of the Rayleigh wave will change, and the dispersion curve of the Rayleigh wave velocity reflects the dispersion characteristics of the Rayleigh wave. In order to study how to use Rayleigh wave dispersion information for damage identification, the finite element model of FRP and steel two-layer medium is established, and the generation mechanism and propagation characteristics of Rayleigh wave on the surface of steel beam strengthened by FRP are studied. The Rayleigh wave is identified from the wave field snapshot, the influence parameters of the wave field numerical simulation are determined, the interfacial peeling damage of the steel beam strengthened by FRP is simulated, and the cross-correlation analysis method for solving the velocity dispersion curve of the Rayleigh wave group is introduced. The accuracy of the finite element simulation is verified by the comparison between the Rayleigh wave velocity calculated by the theoretical formula and the Rayleigh wave velocity simulated by the finite element method. In this paper, the two-dimensional finite element simulation of steel beams strengthened with full-span FRP is carried out, the effects of peeling damage and cracks on the propagation of Rayleigh waves are analyzed, and the corresponding velocity dispersion curves of Rayleigh wave groups are calculated forward. The relationship between the interfacial peeling damage and the velocity dispersion curve of the Rayleigh wave group is found out. When the interface peeling damage occurs, the amplitude of the Rayleigh wave group velocity between the same detection point pairs decreases in some frequency bands, and the velocity dispersion curve of the Rayleigh wave group tends to shift downward in the corresponding frequency band, and the longer the interface peeling damage is, the larger the interface peeling damage length is. The larger the downward translation of the curve is, the greater the downward translation of the curve is. The difference of velocity dispersion curve between different detection point pairs in the same structure is related to the interfacial peeling damage. In this paper, Euclidean distance and angular separation degree are used to measure the difference between dispersion curves. It is considered that when the angular separation degree of the two curves is more than 0.9, the data collected in the detection process are effective. The corresponding Euclidean distance can be used as an index for interfacial peeling damage detection. Based on this, a method for detecting interfacial peeling damage of steel beams strengthened with FRP is proposed in this paper. In this paper, the normalized average Euclidean distance is used as the detection index of interfacial peeling damage. The three-dimensional finite element model of steel beams strengthened with non-full-span FRP is established, and the damage detection method based on the model is used to simulate the interfacial peeling damage of steel beams strengthened by FRP. The three influencing factors of the minimum recoverable size and the comparative advantages of the detection methods in this paper are analyzed.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU393.3;TU317

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