THREE-DIMENSIONAL WIND LOAD EFFECTS AND WIND-INDUCED DYNAMIC RESPONSES OF A TALL BUILDING WITH X-SHAPE

摘要

Three-dimensional wind load effects on a tall building with X-shape are investigated based on measured syn-nchronous surface pressures in a wind tunnel. The mean and root-mean-square storey force coeffi cients in the three nprimary directions, i.e. along-wind, crosswind and torsional wind, of the building are presented. Wind-induced nresponse analysis has been carried out in time domain by using the step-by-step numerical integration method, nand the occupant comfort performance of the practical 42-storey building is checked against the Chinese tall nbuilding design code. In the dynamic analysis, the buildings are modelled by a lumped mass system having three ndegrees of freedom at each fl oor level, i.e. two orthogonal translations and one rotation about a vertical axis. A nnew resultant displacement projection method is proposed to calculate the gust response factors (GRFs) along ntwo orthogonal coordinate directions for design purpose. Not only can the calculated GRFs ensure the synchro-nnization among the maximum resultant displacement and the maximum component displacements along X- and nY-axes, but also are capable of taking crosswind effects into account. Copyright © 2009 John Wiley & Sons, nLtd.