水泥基壓電傳感系統在混凝土結構動態監測中的應用

文中在新型水泥基压电传感器的基础上开发了一套水泥基压电传感系统，该系统由水泥基 压电传感器、专门开发的小型电荷放大器、多通道数据采集仪和监测软件组成。该水泥基压电传感 系统具有与混凝土的兼容性好，耐久性好，成本低廉等优点。将该系统应用到短柱模型和框架结构 模型的动态响应测试中。试验结果表明: 水泥基压电传感器在埋入混凝土构件后其频响特性和输入 输出的线性关系不变，而且由其构成的传感系统还能够准确获得结构在简谐及地震地面运动下的内 力。水泥基压电传感系统可用于混凝土结构的动态监测。 In this paper a cement-based piezoelectric sensing system, including a sensing element, a small scale home made amplifier, and a home made (analog-digital) conditioner is developed. The sensing system has some advantages, such as compatibility with concrete, good durability and low cost. The dynamic responses of a prism and a two story model frame structure are measured by using the developed sensing system for checking its performance. From the test results, it is found that the frequency independency and linearity of the cement-based piezoelectric sensor don't change after embedded into concrete and the developed sensing system can measure the stresses of the frame under the loading induced by shaking table with both harmonic and earthquake ground motions. Thus, it is valid and reliable for the cement-based piezoelectric sensing system to monitor the performance of concrete structure.