Locating damage using integrated global-local approach with wireless sensing system and single-chip impedance...

Area of Science:

• Structural Engineering
• Civil Engineering
• Materials Science

Background:

• Structural health monitoring (SHM) is crucial for assessing building integrity.
• Existing methods often lack the precision for both global and local damage detection.
• Wireless SHM systems offer advantages in deployment and data acquisition.

Purpose of the Study:

• To develop an integrated global-local approach for accurate damage localization in building structures.
• To embed a novel damage index within a wireless SHM system for initial damage identification.
• To utilize electromechanical impedance measurements for detailed local damage assessment.

Main Methods:

• Development of a novel embedded frequency response function damage index (NEFDI) for global damage detection.
• Integration of NEFDI into an Imote2.NET-based wireless structural health monitoring (SHM) system.
• Application of an electromechanical impedance (EMI)-based method for local damage identification using a portable, single-chip device.

Main Results:

• The integrated global-local approach successfully located damage in both numerical simulations of a shear frame and experimental tests on a steel frame.
• NEFDI effectively indicated the approximate location of global damage.
• The EMI-based method precisely identified detailed local damage within the structure.

Conclusions:

• The proposed integrated global-local SHM approach provides an effective strategy for comprehensive damage assessment in buildings.
• The combination of NEFDI and EMI offers a robust solution for both initial damage indication and precise localization.
• The use of a portable impedance measurement device enhances the practicality of the proposed SHM system.