الفهرس 
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Abstract
In the past several decades, engineers usually use two-dimensional structural models and one horizontal earthquake component for the seismic analysis and design of building structures despite the fact that building structures are generally three-dimensional and are subjected to multi-component earthquake excitations. However, in recent years with the advances in computers and software, it becomes possible to perform more advanced analyses for predicting the performance and the vulnerability of three-dimensional buildings under multi-component earthquake excitations.
In this study, the seismic performances of three RC buildings having 6-, 10- and 20-stories under multi-component earthquake excitations are evaluated. Two suites each of 10 multi-component earthquake records with a wide range of vertical to horizontal peak spectral ratios are selected to evaluate the multi-component effect of the earthquake records and the site-to-source distance effect on the selected structures. The first suite represents the near-source earthquakes, while the second is for the far-source seismic excitations.
The building performances are evaluated in the elastic deformation range and also in the inelastic deformation range at 2% maximum story drift ratio. The performances of the buildings are evaluated through global and local performance parameters. The global performance parameters are the roof displacements and the maximum story drift ratios. The local performance parameters are the maximum axial forces and strain ductility factors in the building members.
Four analysis cases are considered for each earthquake including, one lateral earthquake component (X-case), two lateral earthquake components (XY-case), one lateral earthquake component accompanied with the vertical earthquake component (XZ-case) and two lateral earthquake components accompanied with the vertical earthquake component (XYZ-case). The results indicated that the multi-component effect of the earthquakes did not significantly affect the global performance parameters of the buildings, while it has a considerable effect on the axial forces and strain ductility factors of the building columns.