预应力波纹管孔道压浆质量的超声检测方法研究

项目名称： 预应力波纹管孔道压浆质量的超声检测方法研究

项目编号： No.11274091

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 韩庆邦

作者单位： 河海大学

项目金额： 91万元

中文摘要： 波纹管孔道压浆是后张预应力梁最关键工序之一，其压浆质量（密实度、缺陷）直接影响着桥梁的耐久性、承载能力和抗裂性能，但目前还没有可靠的检测方法。本项目将从理论及实验上对预应力孔道波纹管结构的超声检测方法进行全面研究。由严格的波动理论出发，计算钢绞线中的导波传播规律及多层圆柱结构的瞬态波形，利用有限元或有限差分方法对波纹管结构进行建模及仿真，获取仿真波形。建立多种离散物理切片模型，对模型进行二维声场测量，并获取阵列检测信号。将理论计算、有限元（差分）仿真以及模型实验获得的信号进行对比分析，借助于信号处理手段对信号进行模式识别及特征提取，分离出明显反应缺陷信息的信号。在此基础上再建立实际离散模型模块并进行测量，对分离出的微弱信号进行特征增强处理后得到能标定压浆质量的指示函数。最后实际制作预留缺陷的模型并进行检测，验证所标定的指示函数的正确性及准确性，为实际工程检测仪器的研发奠定坚实的基础。

中文关键词： 超声检测；波纹管；压浆；钢绞线；频散

英文摘要： The corrugated pipe grouting is one of the key working procedure in the post-tensioned pre-stressing concrete beam, the grouting quality （compactedness, defect）directly affect the bridge durability, carrying capacity and crack resistance, but there is still no reliable test method nowadays.The aim of this project is to study the ultransonic detect method of the prestressed bellows structure from theory and experiment comprehensively. By strict wave theory, the guided wave propagation in the steel strand and the transient waveform of the multi-layer cylindrical structure will be calculated; the finite element or finite difference method will be used to simulate the waveform . By using the physical model of discrete slice, the model 2 d sound field will be measured, and array detection signal will be collected. Based on the theoretical calculation and finite element (difference) simulation and model 2d signal characteristics, by means of the signal processing, the signal pattern recognition and feature extraction will be performed to obtain the obvious defect information.On the basis of conclusion obtained by theory and physical model experiment, the discrete models are set up to measure signal ,the separation weak signal will be enhanced treatment to obtain an instructions function which could calibrate groutin

英文关键词： ultrasonic testing；Corrugated pipe；grouting；steel strand；dispersion