STIFFNESS IDENTIFICATION OF HIGH-RISE BUILDING WITH UNKNOWN VIBRATION SOURCE USING BENDING-SHEAR MODEL AND ARX MODEL

A new stiffness identification method for a high-rise building is proposed when the building includes an unknown vibration source at the top. By performing limit manipulation, the ratios between shear stiffness coefficients of consecutive stories can be obtained from the floor acceleration data and the ratios of the rotational stiffness to the shear stiffness (SR stiffness ratio). The level of stiffness coefficients can be determined to satisfy the recorded lowest natural frequency and the SR stiffness ratios can be obtained to satisfy the compatibility of higher-order natural frequencies. The validity of the proposed method is examined through actual recorded data.