Damage Location and Quantification Indices of Shear Structures Based on Changes in the First Two or Three Natural...

Area of Science:

• Structural Engineering
• Vibration Analysis
• Damage Detection

Background:

• Multistory shear structures are susceptible to damage, necessitating reliable monitoring techniques.
• Existing methods may require extensive sensor networks or complex analyses.
• Natural frequencies are sensitive indicators of structural integrity.

Purpose of the Study:

• To develop accurate and cost-effective damage detection algorithms for multistory shear structures.
• To utilize minimal data, specifically the first few natural frequencies, for damage assessment.
• To quantify both the location and severity of stiffness-reduction-based damage.

Main Methods:

• Algorithms based on changes in the first two or three natural frequencies.
• Utilizing damage location indices (DLI) and damage quantification indices (DQI).
• Analysis of shifts in squared natural frequencies between undamaged and damaged states, considering system identification uncertainties.

Main Results:

• The proposed methods accurately determine the location and severity of structural damage.
• The algorithms are effective even with uncertainties in natural frequency identification.
• Demonstrated accuracy and cost-effectiveness by relying solely on frequency shifts.

Conclusions:

• The developed algorithms provide a practical approach for structural health monitoring.
• Minimal reliance on natural frequencies offers a cost-effective solution for damage detection.
• The methods are robust and applicable to multistory shear structures with stiffness degradation.