The results show that there is good relative correlation between the sensors number and coverage intensity obtained with modal and modified modal assurance criterion approaches for moment-resisting frame system, but for integrated frame such as moment-resisting frame with base isolation and moment-resisting frame with base isolation with steel shear wall, the modified modal assurance criterion approach is better approach. All of novel optimal sensor placement processes were done through FEM-MAC-TTFD code modeled and developed in MATLAB by authors of this article. The modified type of modal assurance criterion values can be achieved from modal assurance criterion with the exact seismic displacement. A new method called transformed time history to frequency domain approach was evaluated to transform nonlinear time history analysis results to frequency domain and then the effective frequencies according the maximum range of Fourier amplitude were selected. This approach was proposed based on combination of common optimal sensor placement algorithm and nonlinear time history analysis. These frames including moment-resisting frame, moment-resisting frame with base isolation, and moment-resisting frame with base isolation with steel shear wall were selected for case studies. In this article, a novel algorithm for optimal sensor placement in various steel frames was evaluated. The geometric configuration of sensors must be optimized based on coverage intensity with proper objectives. The coverage intensity of sensors is the most important issue on structural health monitoring technique.
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