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Masonry, known for its strength, durability, and aesthetic versatility, encompasses construction with solid stone or man-made units like bricks, clay tiles, terra cotta, and concrete blocks, combined to form structures like walls, floors, and arches. These units are placed in a systematic fashion, known as coursing, and are bound together using mortar—a mixture typically made of water, cement, and sand.
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Efflorescence in Masonry01:25

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Stretching Method-Based Operational Modal Analysis of An Old Masonry Lighthouse.

Emmanouil Daskalakis1, Christos G Panagiotopoulos2, Chrysoula Tsogka3

  • 1Vancouver Community College, 1155 E Broadway, Vancouver, BC V5T 4V5, Canada. edaskalakis@vcc.ca.

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|August 22, 2019
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Summary
This summary is machine-generated.

Structural health monitoring of the Rethymnon lighthouse uses the stretching method to detect 1% frequency shifts, enabling early damage assessment. This technique shows promise for safeguarding historical monuments.

Keywords:
SHMmodel updatingstretching method

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Area of Science:

  • Civil Engineering
  • Structural Health Monitoring
  • Heritage Conservation

Background:

  • Historical monuments like the Rethymnon lighthouse are susceptible to structural degradation.
  • Effective monitoring is crucial for preserving cultural heritage and ensuring public safety.

Purpose of the Study:

  • To evaluate the efficacy of the stretching method for structural health monitoring of the Rethymnon lighthouse.
  • To assess the method's capability in detecting subtle changes in natural frequencies indicative of damage.

Main Methods:

  • Utilized structural vibration data from a limited sensor network over a 3-month period.
  • Applied the stretching method, comparing current structural state signals with a reference healthy condition signal.
  • Defined reference quantity using an 8-day interval and current quantity using a 24-hour window.

Main Results:

  • Demonstrated the ability to detect frequency shifts as small as 1% with high accuracy.
  • Developed and calibrated a simple numerical model matching stretching method frequencies.
  • Validated the model by comparing its simulated response during an earthquake with actual measurements.

Conclusions:

  • The stretching method shows significant potential for the structural health monitoring of historical monuments.
  • The study provides promising preliminary results for early damage detection and assessment.
  • Further long-term monitoring with enhanced instrumentation is recommended for comprehensive analysis.