System identification of super high-rise buildings using limited vibration data during the 2011 Tohoku (Japan) earthquake

摘要

A new method of system identification of high-rise buildings is proposed in which high-rise buildings arenrepresented by a shear-bending model. The method is devised to find the story shear and bending stiffnesses ofna specific story from the horizontal floor accelerations. The special characteristic of the proposed method is tonuse a previously derived set of closed-form expressions for the story shear and bending stiffnesses in terms ofnthe limited floor accelerations and to utilize a reduced shear-bending model with the same number of elementsnas the vibration recording points. In the proposed method, a difficulty of prediction of an unstable specific functionnin a low-frequency range can be overcome by introducing an ARX model. It is demonstrated that the shearbendingnmodel can simulate the vibration records with a reasonable accuracy. It is shown further that the vibrationnrecords at two super high-rise buildings during the 2011 Tohoku (Japan) earthquake can be simulated with thenproposed method including a technique of adding degrees of freedom between the vibration recording points.nCopyright © 2012 John Wiley & Sons, Ltd.