Damage Identification Analyses of a Historic Masonry Structure in T-F Domain

IF 0.8 4区工程技术 Q4 ENGINEERING, CIVIL

Teknik Dergi Pub Date : 2021-03-01 DOI:10.18400/tekderg.426728

K. Beyen

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引用次数: 5

Abstract

Fatih mosque, a landmark structure in Istanbul, has suffered structural damage during 1999 Kocaeli earthquake. Using spectral, time-domain (OKID/ERA for SISO and MIMO models) and T-F domain ( WT, HHT ) techniques on ambient vibrations, damage identification has been performed. Results of parametric and spectral analyses indicate close global peaks. Northwest arch ( O 3 ) that was expected to move in harmony with other arches cannot display such a consistent behavior and produces additional local frequency at 24Hz due to disintegrated stones around the crown. Southeast arch ( O 1 ) also has comparable damage producing another locality at 38Hz. Extending linear approaches into nonl inear-nonstationary methods, WT and HHT improved the results in the temporal-frequency energy distribution. Estimated individual and global structural behavior are consistent with visually inspected damage states for O 3 and O 1 . On a global scale, damage additionally generates significant nonstationarity. D ecompositions in WT and HHT show the capability of identifying nonlinear-nonstationary process hidden in the data. T-F analysis detects and localizes any anomalous system behavior and can adequately capture the dynamical behavior of damage in any instrumented part of the structure at any particular time epoch. For historical masonry structures with vulnerable components like large central dome and arches that have low redundancy, there is a need to develop automatic signal/image processing through image processing, machine vision, and pattern recognition for early diagnosis and prognosis for warning of gradually emerging structural degradations.

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某历史砖石结构T-F区损伤识别分析

法提赫清真寺是伊斯坦布尔的一座标志性建筑，在1999年科卡埃利地震中遭受了结构性破坏。使用频谱、时域（SISO和MIMO模型的OKID/ERA）和T-F域（WT、HHT）技术对环境振动进行了损伤识别。参数和光谱分析的结果表明接近的全局峰值。西北拱（O3）原本预计会与其他拱协调移动，但由于牙冠周围的石块崩解，它无法表现出如此一致的行为，并在24Hz处产生额外的局部频率。东南拱（O1）也有类似的损伤，在38Hz时产生另一个位置。将线性方法扩展到非线性非平稳方法中，WT和HHT改进了时间频率能量分布的结果。对于O3和O1，估计的单个和全局结构行为与目视检查的损伤状态一致。在全球范围内，损害还会产生显著的非平稳性。WT和HHT中的D估计显示了识别隐藏在数据中的非线性非平稳过程的能力。T-F分析可以检测和定位任何异常系统行为，并可以充分捕捉在任何特定时间段结构的任何仪器部件中的损伤动态行为。对于具有易损部件的历史砌体结构，如具有低冗余度的大型中央穹顶和拱门，需要通过图像处理、机器视觉和模式识别来开发自动信号/图像处理，用于早期诊断和预测，以警告逐渐出现的结构退化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Teknik Dergi 工程技术-工程：土木

自引率

30.80%

发文量

审稿时长

>12 weeks

期刊介绍： The scope of Teknik Dergi is naturally confined with the subjects falling in the area of civil engineering. However, the area of civil engineering has recently been significantly enlarged, even the definition of civil engineering has somewhat changed. Half a century ago, engineering was simply defined as “the art of using and converting the natural resources for the benefit of the mankind”. Today, the same objective is expected to be realised (i) by complying with the desire and expectations of the people concerned and (ii) without wasting the resources and within the sustainability principles. This change has required an interaction between engineering and social and administrative sciences. Some subjects at the borderline between civil engineering and social and administrative sciences have consequently been included in the area of civil engineering. Teknik Dergi defines its scope in line with this understanding. However, it requires the papers falling in the borderline to have a significant component of civil engineering.