...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Smart Materials & Structures >Detecting minute damage in beam-like structures using the neutral axis location
【24h】

Detecting minute damage in beam-like structures using the neutral axis location

机译：使用中性轴位置检测梁状结构中的微小损坏

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The neutral axis is the curve within a cross-section of a beam under loading at which the normal stress and strain vanish. The neutral axis is correlated with the centroid of stiffness which depends on material and geometric properties of the beam cross-section. The centroid is sensitive to changes in area and stiffness of the cross-section, i.e. damage. The neutral axis is a universal parameter in beam-like structures, and since the majority of structural systems is based on beams, the neutral axis location can be used as a damage sensitive feature in a variety of structures. In this paper the sensitivity of the neutral axis location to minute damage is studied through a test structure with induced artificial damage. The structure was equipped with long-gauge fiber-optic strain sensors in three cross-sections, one with partial delamination in the concrete, one with a small crack, and one with no damage (healthy). The structure was monitored during lifting and transport, and dynamic tests were performed in close-to-real conditions. A detailed uncertainty analysis was performed both on the evaluations of the centroid location and the neutral axis measurements. A Z-score hypothesis test was used to set thresholds and determine whether the damage was detected or not. The results show that the neutral axis location is sensitive to minute damage, and that the latter can be detected within the uncertainty limits in on-site conditions.
机译：中性轴是梁横截面内在载荷下的曲线，在该载荷下法向应力和应变消失。中性轴与刚度质心相关，刚度质心取决于梁横截面的材料和几何特性。质心对横截面的面积和刚度变化（即损坏）敏感。中性轴是梁状结构中的通用参数，并且由于大多数结构系统都基于梁，因此中性轴的位置可用作各种结构中的损伤敏感特征。在本文中，通过带有人工损伤的测试结构研究了中性轴位置对微小损伤的敏感性。该结构在三个横截面上配备了长规格的光纤应变传感器，一个在混凝土中局部分层，一个在裂缝中很小，一个没有损坏（健康）。在举升和运输过程中对结构进行监控，并在接近真实的条件下进行动态测试。对质心位置的评估和中性轴测量均进行了详细的不确定性分析。 Z得分假设检验用于设置阈值并确定是否检测到损坏。结果表明，中性轴位置对微小损伤很敏感，并且可以在现场条件下的不确定性范围内检测到后者。

著录项

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