钢桥面板与铺装层间粘结强度无损检测试验研究

发布时间：2018-10-24 15:41

【摘要】：桥面铺装层的耐久性是大跨径钢桥建设中的一项高难度的关键技术，防水粘结层是确保其结构耐久性的重大措施之一，一些研究者甚至指出，防水粘结层的剪切破坏是造成桥面铺装损坏的根本原因。所以，全面系统地研究大跨径钢桥桥面铺装层粘结强度检测技术，对大跨径桥梁的设计和维护具有重要的意义。然而，现有粘结强度检测方式主要为有损检测，不允许用在实际钢桥面板与铺装层间粘结强度检测中，实际中，该粘结强度往往不得而知。因此，研究无损检测技术在此处的适用性非常必要。本文用超声反射法从钢板一侧对该粘结强度进行了试验研究，主要工作如下：（1）对四种波形在此处的适用性进行了分析，选择纵波进行试验；（2）用超声检测常用频率探头0.5-10MHz对纯钢板进行试验，根据试验回波峰值包络曲线的衰减指数及包络面积选择5MHz大探头作为检测用探头；（3）根据声学边界条件及工程经验，对试验模型进行了简化并制作了三种缺陷界面；（4）通过现有声学参数、声学知识及后续选探头的试验研究，提出用回波峰值包络曲线的衰减指数及包络面积进行各界面区分的方法；（5）利用室外试样试验结果给出了钢-气、钢-水、钢-土三种缺陷界面衰减指数及包络面积均值，初步分析该方法可用于甄别三种缺陷界面；（6）对室内试样初步判断粘结良好区域，选择了141个测点，初步给出了该试样粘结良好界面的衰减指数范围；（7）分析了人手力对试验结果的影响，，指出人手力非直接影响结果因素，并给出了后续试验应注意事项；（8）给出了无损有损检测测试布点图，供后续试验进行。
[Abstract]:The durability of deck pavement is a very difficult key technology in the construction of long span steel bridge. Waterproofing and bonding layer is one of the most important measures to ensure the durability of bridge deck pavement, and some researchers even point out that, The shear failure of waterproof adhesive layer is the root cause of bridge deck pavement damage. Therefore, it is of great significance for the design and maintenance of long span steel bridge to study comprehensively and systematically the detection technology of bond strength of deck pavement of long span steel bridge. However, the existing bond strength detection methods are mainly lossy detection, which is not allowed to be used in the actual steel bridge deck and pavement bond strength detection, in practice, the bond strength is often unknown. Therefore, it is necessary to study the applicability of NDT technology here. In this paper, the bond strength is tested from one side of the plate by ultrasonic reflection method. The main work is as follows: (1) the applicability of the four waveforms here is analyzed, and the longitudinal wave is selected to test; (2) the pure steel plate is tested with frequency probe 0.5-10MHz, and the large 5MHz probe is selected as the detector according to the attenuation index and envelope area of the peak envelope curve of the test echo, (3) according to the acoustic boundary condition and engineering experience, The test model is simplified and three defective interfaces are made. (4) through the existing acoustic parameters, acoustic knowledge and subsequent probe selection test, In this paper, the attenuation index and envelope area of echo peak envelope curve are used to distinguish each interface. (5) based on the test results of outdoor samples, the attenuation index and the mean value of envelope area of three kinds of defects, steel gas, steel water and steel soil, are given. The method can be used to identify three kinds of defect interfaces. (6) 141 measuring points are selected to determine the good bonding area of indoor samples, and the attenuation index range of the good bond interface of the samples is given preliminarily. (7) analyzing the influence of manual force on test results, pointing out that manual force does not directly affect the results, and giving the points needing attention in subsequent tests, and (8) giving the layout diagram of nondestructive testing for subsequent tests.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U443.33;U446

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