基于DIC测量技术的高桩码头结构性能检测方法研究
发布时间：2018-12-17 22:37
【摘要】：本文内容主要以围绕三种尺度下的结构实验展开,这三种不同尺度结构实验分别为标准混凝土试块轴向压缩实验,外径160mm长度1200mm的钢管混凝土轴向压缩实验以及按照几何比尺1:10进行设计的重庆果园港二期码头结构模型下的撞击力实验。本文确定了DIC(Digtal Image Correlation,即数字图像相关技术)测量技术的可靠性,并通过控制变量法,明确了DIC测量技术在不同尺度下的检测方法,提高了其测量精度水平,达到了为结构原型实时应用DIC技术打下基础的目的,同时文中还阐述了不同尺度下的位移应变演化结果,探讨了码头结构性能检测关键问题,提出了对水工结构检测标准的建立问题。得出的主要的结论如下:(1)在标准混凝土试块轴向压缩实验中,曲线初始阶段测量值跳动较大,上升阶段至最大承重力前测量结果准确,与理论值相一致,DIC测量技术能够满足试件及整体结构试验在最大承重力前的测量精度要求,不同尺度实验结果相同。(2)实验表明散斑尺寸对测量值精度影响显著,最优尺寸为6-15个像素点;另一重要参数光源误差置信区间应控制在0.004附近;(3)基于钢管混凝土桩的轴向压缩DIC检测试验可知,数值稳定性与分析区域成负相关,计算速度与分析区域成正相关,实验当合理选择分析区域;标定板的选用当与摄像头拍摄场景相匹配,最大化覆盖测量区域为佳;拍摄场景与测量精度成负相关,与投影误差成正相关,因此应用DIC测量当合理选用测量镜头,在大场景测量时可配合短焦距镜头进行细部检测;分析不同拍摄间隔曲线值发现,时间间隔对测量值不产生影响;基于2D和3D对比试验得出,双目拍摄较旧法单目拍摄解决了试件弯曲部分误差大的问题,具体变量参数值文中将做详细说明。(4)本文列出了多组钢管混凝土竖向位移演化图,包括有无钢筋,有无钢护筒,不同钢护筒厚度和不同拍摄场景四种情况,结果表明DIC测量技术能够清晰地反映构件的位移应变演化规律,测点数值变化趋势,初步设想在多组试验的基础上建立构件破坏标准值,进一步优化DIC原型测量技术。(5)基于码头整体结构模型撞击力实验,结合前文成果建立了整套DIC码头整体结构检测技术路线,明确了主要技术指标。实践证明将DIC测量技术作为一种新型无损检测技术前景可观,在结构时变分析部分优势明显,可对整体结构及单一构件检测进行定量分析,提出了结合无人机拍摄技术和在统计学基础上建立结构检测标准的初步设想,为更加快速高效地进行实地原型结构性能检测打下基础。
[Abstract]:The main contents of this paper are based on the structural experiments under three different scales, which are the axial compression experiments of standard concrete test blocks. The axial compression test of concrete filled steel tube (1200mm) with outer diameter of 160mm length and the impact force experiment under the structural model of Chongqing Orchard Port Phase II wharf designed at 1:10 of geometric scale were carried out. In this paper, the reliability of DIC (Digtal Image Correlation, (Digital Image correlation) measurement technology is determined. By controlling variable method, the detection methods of DIC measurement technology at different scales are defined, and the measurement accuracy level is improved. The aim of this paper is to lay the foundation for the real-time application of DIC technology to the prototype of the structure. At the same time, the evolution results of displacement and strain at different scales are described, and the key problems in detecting the structure performance of the wharf are discussed. The establishment of the inspection standard for hydraulic structure is put forward. The main conclusions are as follows: (1) in the axial compression test of the standard concrete test blocks, the measured values of the initial phase of the curve are larger than those of the experimental data, and the measured results are accurate before the rising stage to the maximum load-bearing force, and are consistent with the theoretical values. The DIC measurement technique can meet the precision requirements of the specimen and the whole structure test before the maximum load-bearing force. (2) the experimental results show that the speckle size has a significant effect on the accuracy of the measured values. The optimal size is 6-15 pixels. The confidence interval of light source error of another important parameter should be controlled in the range of 0.004; (3) based on axial compression DIC test of concrete-filled steel tubular pile, the numerical stability is negatively correlated with the analysis area, and the calculation speed is positively correlated with the analysis area. When the calibration board is matched with the camera, it is better to maximize the coverage of the measurement area. The shooting scene has a negative correlation with the measurement accuracy and a positive correlation with the projection error. Therefore, when the measurement lens is reasonably selected by using DIC measurement, it can be combined with the short focal length lens to carry out the detail detection in the large scene measurement. By analyzing the curve values of different shooting intervals, it is found that the time interval has no effect on the measured values. Based on 2D and 3D comparative tests, it is found that binocular photography can solve the problem that the error of bending part of the specimen is larger than that of the old monocular method. (4) the evolution diagram of vertical displacement of concrete-filled steel tube (CFST) is listed in this paper, including whether there is a steel bar, whether there is a steel guard, different thickness of the steel tube and different shooting scenes. The results show that the DIC measurement technique can clearly reflect the displacement and strain evolution of the member, and the numerical change trend of the measuring points. The preliminary assumption is to establish the damage standard value of the component on the basis of multi-group tests. Further optimize the DIC prototype measurement technology. (5) based on the impact force experiment of the overall structure model of the wharf, combined with the previous results, a whole set of DIC wharf overall structure detection technology route is established, and the main technical specifications are defined. It is proved by practice that DIC measurement technology has a promising prospect as a new type of nondestructive testing technology. It has obvious advantages in time-varying analysis of structure, and can be used for quantitative analysis of whole structure and single component. Combined with UAV shooting technology and the establishment of structure detection standard on the basis of statistics, this paper puts forward a preliminary idea, which lays a foundation for faster and more efficient performance testing of prototype structures in the field.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U656.113
本文编号：2384895
[Abstract]:The main contents of this paper are based on the structural experiments under three different scales, which are the axial compression experiments of standard concrete test blocks. The axial compression test of concrete filled steel tube (1200mm) with outer diameter of 160mm length and the impact force experiment under the structural model of Chongqing Orchard Port Phase II wharf designed at 1:10 of geometric scale were carried out. In this paper, the reliability of DIC (Digtal Image Correlation, (Digital Image correlation) measurement technology is determined. By controlling variable method, the detection methods of DIC measurement technology at different scales are defined, and the measurement accuracy level is improved. The aim of this paper is to lay the foundation for the real-time application of DIC technology to the prototype of the structure. At the same time, the evolution results of displacement and strain at different scales are described, and the key problems in detecting the structure performance of the wharf are discussed. The establishment of the inspection standard for hydraulic structure is put forward. The main conclusions are as follows: (1) in the axial compression test of the standard concrete test blocks, the measured values of the initial phase of the curve are larger than those of the experimental data, and the measured results are accurate before the rising stage to the maximum load-bearing force, and are consistent with the theoretical values. The DIC measurement technique can meet the precision requirements of the specimen and the whole structure test before the maximum load-bearing force. (2) the experimental results show that the speckle size has a significant effect on the accuracy of the measured values. The optimal size is 6-15 pixels. The confidence interval of light source error of another important parameter should be controlled in the range of 0.004; (3) based on axial compression DIC test of concrete-filled steel tubular pile, the numerical stability is negatively correlated with the analysis area, and the calculation speed is positively correlated with the analysis area. When the calibration board is matched with the camera, it is better to maximize the coverage of the measurement area. The shooting scene has a negative correlation with the measurement accuracy and a positive correlation with the projection error. Therefore, when the measurement lens is reasonably selected by using DIC measurement, it can be combined with the short focal length lens to carry out the detail detection in the large scene measurement. By analyzing the curve values of different shooting intervals, it is found that the time interval has no effect on the measured values. Based on 2D and 3D comparative tests, it is found that binocular photography can solve the problem that the error of bending part of the specimen is larger than that of the old monocular method. (4) the evolution diagram of vertical displacement of concrete-filled steel tube (CFST) is listed in this paper, including whether there is a steel bar, whether there is a steel guard, different thickness of the steel tube and different shooting scenes. The results show that the DIC measurement technique can clearly reflect the displacement and strain evolution of the member, and the numerical change trend of the measuring points. The preliminary assumption is to establish the damage standard value of the component on the basis of multi-group tests. Further optimize the DIC prototype measurement technology. (5) based on the impact force experiment of the overall structure model of the wharf, combined with the previous results, a whole set of DIC wharf overall structure detection technology route is established, and the main technical specifications are defined. It is proved by practice that DIC measurement technology has a promising prospect as a new type of nondestructive testing technology. It has obvious advantages in time-varying analysis of structure, and can be used for quantitative analysis of whole structure and single component. Combined with UAV shooting technology and the establishment of structure detection standard on the basis of statistics, this paper puts forward a preliminary idea, which lays a foundation for faster and more efficient performance testing of prototype structures in the field.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U656.113
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