...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Smart Materials & Structures >Damage detection of shear buildings using deflections obtained by modal flexibility
【24h】

Damage detection of shear buildings using deflections obtained by modal flexibility

机译：使用模态灵活性获得的挠度检测剪切建筑物的损伤

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

This paper presents a vibration-based damage detection method for shear buildings using the damage-induced deflections estimated by modal flexibility from ambient vibration measurements. This study intends to provide a basis for the damage detection problem of more complex building structures by investigating a rather idealized structure, a shear building. From analytical investigations on the damage-induced inter-story deflection (DI-ID) of shear buildings, it was shown that the DI-ID occurs only at damaged floors and not at intact floors as long as a proper load is applied to the building. To simplify the damage detection procedure a new load concept, the positive shear inspection load (PSIL), was proposed, defined as a load producing positive shear forces at all floors. It was shown that an excessive DI-ID under a PSIL indicates the existence of damage to the building and that the floors with excessive DI-ID are the damaged floors. A simple damage index Z_i is proposed based on outlier analysis to account for measurement noise. Numerical and experimental studies on a 5-story shear building were carried out for two damage scenarios with 10% column E I reductions. The proposed method was found to identify the damage locations successfully for the multiple damage case as well as the single damage case, with no false-positive or false-negative detections. For the purpose of comparison, damage detection was also conducted using the damage index method and the mode shape curvature method. The mode shape curvature method was found to be the most sensitive metric, but it showed false-positive detections on an undamaged floor. The damage index method had no false-positive detections, but it was found to miss some damage in the multiple damage case.
机译：本文提出了一种基于剪切振动的基于振动的损伤检测方法，该方法使用了由环境振动测量中的模态柔性估算的损伤引起的挠度。本研究旨在通过研究较为理想的结构（剪力建筑）来为更复杂的建筑结构的损坏检测问题提供基础。通过对剪力建筑物的破坏引起的层间挠度（DI-ID）的分析研究，表明，只要对建筑物施加适当的载荷，DI-ID仅出现在受损的地板上，而不发生在完整的地板上。为了简化损坏检测程序，提出了一种新的载荷概念，即正剪力检查载荷（PSIL），定义为在所有楼层均产生正剪力的载荷。结果表明，PSIL下的DI-ID过多表示建筑物受到损坏，而DI-ID过多的地板就是损坏的地板。基于异常值分析，提出了一种简单的损伤指数Z_i来考虑测量噪声。针对五层剪力建筑的数值和实验研究，针对两种破坏情景，即将柱E I减少了10％。发现了所提出的方法，可以成功地识别出多个损坏案例和单个损坏案例的损坏位置，而不会检测出假阳性或假阴性。为了进行比较，还使用损伤指数法和振型曲率法进行损伤检测。模态曲率法被认为是最敏感的指标，但在未损坏的地板上显示出假阳性检测结果。损坏指数方法没有假阳性检测结果，但是发现在多次损坏情况下会丢失一些损坏。

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