基于压电陶瓷的型钢混凝土柱界面缺陷识别研究

发布时间：2018-06-19 06:52

  本文选题：型钢混凝土 + 界面剥离　； 参考：《湖南大学》2015年硕士论文

【摘要】：近年来,大量的设计高度在600米左右的超高层建筑正在中国建设。由于具备优良的力学性能,承载能力高,延性好,抗震性能好,具有传统的钢筋混凝土结构以及钢结构所不可以比拟的优点,型钢混凝土柱已经被广泛用作超高层建筑竖向承载力构件。随着型钢混凝土柱截面的增加,两个方向的竖向钢板与水平方向的横隔板往往会形成独立的腔体,呈现出截面尺寸大型化以及形状不规则化的特点。由于大体积混凝土在养护凝固后,可能会存在收缩,柱芯混凝土与钢板界面粘结状况及混凝土与横隔板界面剥离缺陷,一直是一个严峻的问题。由于构件的不规则性,传统的超声检测方法难以有效的对缺陷进行识别,界面性能的监测及剥离缺陷的识别仍然是一个具有挑战性的任务。压电陶瓷智能材料集驱动传感于一身,并且具有响应速度快、灵敏度高,频响范围宽以及线性关系好等优点,为型钢混凝土组合结构界面缺陷识别提供了新思路。本文提出了一种基于压电陶瓷的复杂多腔型钢混凝土柱界面剥离缺陷识别方法,并开展比例模型试验和应用研究。具体工作包括以下几个方面:(1)在介绍了压电陶瓷驱动器、传感器的制作方法和流程的基础上详细介绍了基于嵌入式压电驱动和传感的钢骨混凝土界面剥离缺陷监测方法,并解释了激励信号的选取和测量信号的分析处理方法。(2)设计制作了一个具有人工模拟界面剥离的具有三个不规则腔体的复杂型钢混凝土实验柱,将一定数量的嵌入式压电功能元安装在试验柱钢板附近,作为驱动器,将粘贴式压电陶瓷片粘贴在钢板表面,作为传感器。分析压电陶瓷传感器在正弦信号激励下的幅值及扫频信号激励下的小波包能量。结果表明:处于界面剥离区域的压电传感器所接收的正弦信号幅值及扫频信号下的小波包能量明显小于未剥离区域,界面剥离缺陷被成功检测识别。验证了本文所提出的方法对型钢混凝土柱中混凝土与型钢之间界面剥离缺陷识别的有效性。(3)在比例模型试验研究的基础上,利用本文所提出的方法,利用嵌入式压电功能元以及压电陶瓷片对某一在建的超高层建筑中不规则型钢混凝土柱界面粘结状态进行监测。两次监测结果表明:监测结果吻合程度很好,被测型钢混凝土柱界面粘结性能良好。
[Abstract]:In recent years, a large number of super-tall buildings with a design height of about 600 meters are being built in China. Because of its excellent mechanical properties, high bearing capacity, good ductility and good seismic performance, it has the advantages of traditional reinforced concrete structures and steel structures. Steel reinforced concrete columns have been widely used as vertical bearing capacity members of super-tall buildings. With the increase of the section of steel reinforced concrete column, the vertical steel plate in two directions and the horizontal plate in horizontal direction often form an independent cavity, showing the characteristics of large section size and irregular shape. Due to the shrinkage of mass concrete after curing and solidification, it is a severe problem that the bond between column core concrete and steel plate and the debonding defect between concrete and transverse partition plate. Because of the irregularity of the components, it is difficult for the traditional ultrasonic detection methods to identify the defects effectively. It is still a challenging task to monitor the interface performance and identify the peeling defects. Piezoelectric ceramic smart material has the advantages of fast response, high sensitivity, wide range of frequency response and good linear relationship, which provides a new idea for the interface defect identification of SRC composite structure. In this paper, a piezoelectric ceramic based method for identifying the interface debonding defects of complex multi-cavity steel reinforced concrete columns is proposed, and the scale model test and application research are carried out. The specific work includes the following aspects: (1) on the basis of introducing the piezoelectric ceramic actuator, the fabrication method and flow chart of the sensor, this paper introduces in detail the monitoring method of the steel reinforced concrete interface debonding defect based on the embedded piezoelectric drive and the sensor. The selection of excitation signal and the analysis and processing method of measurement signal are explained. A complex steel reinforced concrete experimental column with three irregular cavities with artificial simulated interface is designed and fabricated. A certain number of embedded piezoelectric functional elements are installed near the steel plate of the test column as a driver and the adhesive piezoelectric ceramic plate is pasted on the surface of the steel plate as a sensor. The amplitude of piezoelectric ceramic sensor excited by sinusoidal signal and the wavelet packet energy excited by sweep signal are analyzed. The results show that the amplitude of sinusoidal signal and the energy of wavelet packet in the region of interface stripping are obviously lower than those in the region without stripping, and the defect of interface peeling is detected and identified successfully. It is verified that the method proposed in this paper is effective in identifying the interface debonding defects between concrete and section steel in SRC columns. On the basis of the experimental study of the proportional model, the method proposed in this paper is used. The interface bond state of irregular steel reinforced concrete (SRC) columns in a super tall building under construction is monitored by embedded piezoelectric functional element and piezoelectric ceramic chip. The two monitoring results show that the monitoring results are in good agreement with each other and the interfacial bond properties of the steel reinforced concrete columns tested are good.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU398.9;TU317

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