首页> 外文学位 >Application de la tomographie sonique au diagnostic du beton: Possibilites et limites.
【24h】

Application de la tomographie sonique au diagnostic du beton: Possibilites et limites.

机译:声波层析成像在混凝土诊断中的应用:可能性和局限性。

获取原文
获取原文并翻译 | 示例

摘要

Recognition of the many problems in concrete structures requires the reconstruction of their internal image. For this reason, some years ago, a new nondestructive method, sonic tomography, has been developed for scanning concrete structures. This method is most often based on transient stress wave propagation for verifying a concrete body, as well as measuring the wave velocity. The relative variation in wave propagation velocity in the material provides information about changes in the structure, and therefore the state of degradation.; Capacity and limitation of this method for reconstructing the internal image of the concrete structures are addressed in this thesis. This study discusses some experiments in which sonic tomography were performed on various concrete models in laboratory and the structures in service in-situ. In this case, two important aims are the main focus: (1) Degraded area is usually marked by fracture and delaminations or poorly performed sections within the structure. Unfortunately, most of the degradation in concrete structures remain undetectable to the naked eye. Sonic tomography is a strong technique to show the damaged areas in body concrete. In addition, this technique is able to evaluate internal reparation (e.g. control of grout-injection zones). (2) This is limited by the measurement and reconstruction of image conditions and their parameters (frequency, pixels size, rays type, measurement step,...). For illustrating the real image it is necessary to know precisely these conditions and the quality of their influence on the tomographic image.
机译:认识混凝土结构中的许多问题需要重建其内部形象。因此,几年前,已经开发出一种新的非破坏性方法,即声波层析成像技术,用于扫描混凝土结构。该方法通常基于瞬态应力波传播来验证混凝土主体并测量波速。材料中波传播速度的相对变化提供了有关结构变化的信息,因此也提供了降解状态的信息。本文探讨了这种方法重建混凝土结构内部图像的能力和局限性。这项研究讨论了一些实验,在这些实验中,对实验室中的各种具体模型和就地使用的结构进行了声波层析成像。在这种情况下,两个主要目标是主要重点:(1)退化区域通常以结构中的断裂和分层或性能不佳的部分为标志。不幸的是,混凝土结构的大多数退化仍然是肉眼无法察觉的。声波断层扫描是一种强大的技术,可以显示出人体混凝土中的受损区域。另外,该技术能够评估内部修复(例如,对灌浆区域的控制)。 (2)这受图像条件及其参数(频率,像素大小,光线类型,测量步长...)的测量和重建限制。为了说明真实图像,必须准确了解这些条件及其对断层图像的影响的质量。

著录项

  • 作者

    Sahebi, Mahmod Reza.;

  • 作者单位

    Universite de Sherbrooke (Canada).;

  • 授予单位 Universite de Sherbrooke (Canada).;
  • 学科 Engineering Civil.
  • 学位 M.Sc.A.
  • 年度 1997
  • 页码 145 p.
  • 总页数 145
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号