部分空間法に基づくシステム同定による建物の固有振動数と減衰定数の推定精度

抄録

As the structural health monitoring tools, three subspace-based system identification methods, the ordinary MOESP, the N4SID and the PO-MOESP, were investigated to discuss the identification accuracy of natural frequency and damping factor of buildings. Fundamental case studies using SDOF response data revealed that the identification accuracy of the N4SID was lower than those of the ordinary MOESP and the PO-MOESP. This was because the 2-norm of the matrix applied to the noise in the N4SID was larger than the other methods. Finally, the difference in identification accuracy between three methods was verified by using the strong motion records of an RC super high-rise residential building during the 2011 off the Pacific coast of Tohoku Earthquake.