基于尾波干涉的混凝土结构应力场非加卸载式测量研究

项目名称： 基于尾波干涉的混凝土结构应力场非加卸载式测量研究

项目编号： No.51478072

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 建筑科学

项目作者： 郑罡

作者单位： 重庆交通大学

项目金额： 85万元

中文摘要： 在役桥梁安全事故的根本技术原因之一，在于缺乏结构应力的非加卸载式测量手段。虽经长期研究，这一工程科学难题至今仍未解决。近十年来，在该领域最领先的法国和德国已取得若干重要进展，或将在10年内实现相关理论和应用技术的重大突破。因此，我国亟需加强该领域的研究，一方面避免在该技术领域受制于人；另一方面，力争以科技创新来支撑我国桥梁工程的安全运营。 本项目拟以T梁足尺模型试验为重点、空间差异式尾波阵列测量技术为核心，探讨声学波速场与应力场相互关系模型与参数反演方法，研究基于尾波干涉的应力场非加卸载式测量问题。本项目特色在于混凝土应力场的非加载式测量。与同行研究的不同点（创新点)主要在于：1）推导基于尾波干涉的波速空间差测量算法，以突破现有算法仅处理时间差异的局限性；2)提出基于波速空间差的应力场测量方法，有望在混凝土结构应力的非加卸载式测量技术上取得突破。

中文关键词： 尾波干涉；混凝土结构；应力测量；足尺模型；弹性波

英文摘要： From the tecntic point of view, the essential difficulty to forcast and, consquently,to prevent the accidental fail of in-service bridges lies on the absence of a non-loading-non-unloading type method for the stress field measurement of prestressed concrete structure.Despite the long-term efforts, this engineering scientific problem has not yet been solved. Over the past decade, a few significant progresses have been achieved in French and German which leading this field. Obviously,it is important to enhance research work in this field. On the one hand, it may support us to compete in this field with the top contries; on the other hand, it may support the operation of the great number of reinforced concrete bridges in our contry with new technologis achievd through the research. The proposed reserch would be focused on the full-scale model test of a prestressed simply-supported T-beam.Based on Coda Wav Interferometyr,a detailed study would be carried out on the methodology and the corresponding technology for the stress field measurement of concrete structures. The difference between the proposed project and previous researches lies on two points:(i) Employment of array transducers for the excitation, collection and analysis of coda wave,which is supposed to avoid the loss of spatial information missed by a single or a pair of sensors,and then,(ii)The spatial differences of the wave volocity are employed for the measurement of the stress field in concrete structures.

英文关键词： coda wave interferomety;concrete structure;stress measurement;full scale model;elastic wave