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超声探测混凝土损伤和内部缺陷研究(唐修生)

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i8n AF5r*FI5Q'Ed0超声探测混凝土损伤和内部缺陷研究水利论文 T-w/bzU*F"^&F

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【作者】唐修生 【导师】方璟; 王五平水利论文 X6~E A6]on
【作者基本信息】南京水利科学研究院,材料学,2004年,硕士水利论文&_m oK L NsF?f

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}`z5n:i-N-]/tN3e0【中文摘要】 本文的研究内容分为两大部分: (1)利用常规超声波技术对混凝土的损伤断裂特性进行试验研究 对超声波在混凝土中的应用进行了总结,并对研究混凝土损伤的几种测试方法进行了比较。通过试验,得到了不同水灰比的立方体和棱柱体试块以及不同开口缝深的缺口梁的损伤演变与声学参数(声速和波幅)的关系,验证了混凝土损伤破坏机理。然后,从试验结果出发,讨论了以声学参数为损伤变量建立的损伤因子与荷载变化的关系。试验总结表明,声学参数与弹性模量、应力(应变)参量之间的耦合关系式与水灰比、试件形状、测点位置和荷载大小有关。利用声学参数的变化规律解决了梁中起裂荷载难以确定的问题。 (2)超声波CT技术及其在混凝土内部缺陷检测中的应用 针对混凝土中声速随机分布性和内部缺陷有一定规律的特点,研究了一种将Snell定律与二次追踪技术相结合的射线追踪方法,利用VB语言自编程序实现了对混凝土介质中常见的几种缺陷模型的模拟追踪。对于反演算法,利用自编程序对迭代重建算法(ART算法和SIRT算法)和扩张Kalman滤波法进行了比较,并从理论上分析了三种算法的特点;分析了缺陷区不同速度条件下,三种反演算法针对射线模型和直线模型反演结...更多果的稳定性;详细讨论了影响扩张Kalman滤波法反演精度的影响因素。最后,通过预制的试块模型试验检验了超声波CT技术在混凝土内部缺陷检测中的应用效果。  还原水利论文/WDE9u+vu+w5bRY

j2lP*JS@0【英文摘要】 Two parts of content are studied in this dissertation.(1) Experiments are studied on the damage and fracture characteristics of concrete by means of normal Ultrasonic technology.The applications of Ultrasonic in concrete are summarized, and some kinds of testing methods that researched on the damage of concrete are compared. The relations between Ultrasonic parameters and damage evolution are obtained by test, which include cube and prism specimens with different w/c ratios and notched concrete beams with different depth, and the mechanic of concrete destruction is testified. Finally, start from the testing results, the relation between the changing loads and damage gene that based on the Ultrasonic parameters is discussed. The coupling relational expression that it is between ultrasonic parameters and elastic modulus, stress or strain are relate to the ratio of w/c, the shape of specimens, measure position, the magnitude of loads. And the changes of Ultrasonic parameters are utilized ...更多to judge the cracking load of notched beams.(2) Ultrasonic CT technology and its applications on detecting interior defects of concrete are studied.Considering velocity in concrete distributes randomly and the interior defects have regular shapes, a ray-tracing method is proposed, which combines the Snell principle with the second ray-tracing technology, and it is apply to simulated several common models of defects in concrete. For inversion algorithms, the extending Kalman filtering theory and the iterative reconstruction algorithms including ART and SIRT are compared by computerized model tests, and the characteristics of three kinds of inversion algorithms are analyzed in theory; On condition of different defect velocity, the stability of three kinds of inversion algorithms for ray model and line model are analyzed, and the factors that affect the inversion precision of extending Kalman filtering theory are discussed in detail. All of these are realized in programs that written in VB. Finally, the results of Ultrasonic CT that applied on the interior defects test in concrete are verified by model tests of preparing specimens.  还原

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,EK.n Z;L1p0【中文关键词】 混凝土; 超声波; 损伤; 声学参数; 超声波CT; 射线追踪; 迭代重建算法; 扩张Kalman滤波法
K |zq9W.j)pV0【英文关键词】 Concrete; Ultrasonic; damage; Ultrasonic parameters; Ultrasonic CT; the ray-tracing method; Iterative reconstruction algorithms; the extending Kalman filtering theory水利论文_?d-[+Cnqi8g~

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TAG: 超声 混凝土 唐修生 缺陷 探测
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