This paper deals with the along-wind dynamic response of tall buildings passively controlled by Cross-Tensioned Spring Damper (CTSD) mechanisms. In order to estimate the dynamic response more accu- Rately and efficiently, the building and its CTSD controllers were considered as a coupled non-classical damp- ing system and a new stochastic response analysis method, complex-modal state-space method, was proposed Based on the combination of complex modes of the structural system rather than on the real-modal decomposi- Tion as usual.
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