A new stiffness identification method for a building structure is proposed in the case where the building includes an unknown vibration source. The stiffnesses above the vibration source are determined by the theory for the base input and those below the vibration source are obtained by the theory for the top forced input. The ratios between shear stiffnesses of lower consecutive stories can be obtained from the floor acceleration data and the ratios of the story rotational stiffness to the shear stiffness (SR stiffness ratio). The shear stiffness coefficients and the SR stiffness ratios can be obtained finally to satisfy the compatibility of lower natural frequencies. The validity of the proposed method is examined through numerical simulation and actual recorded data.
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