A NEW APPROACH FOR TUNİNG ATMD İN ORDER TO İMPROVE SEİSMİC RELİABİLİTY İNDEX OF STRUCTURE

Active structural control systems are used to protect structures against seismic excitations.One of the difficulties in the design of structures consideringprotective systems is the explicit consideration of uncertaintyabout the structural model and the potential variability of futureexcitations (Jensen andSepulveda, 2011). According to the uncertain nature of the earthquake phenomena, tuning of an active structural control system for a specific seismic record may not necessarily leads to the optimum performance (Soleymani and Khodadadi, 2013). The tuned system must be fitted for a wide range of seismic excitations. In this paper, a new approach for tuning an ATMD system designated for a tall building is proposed. For this purpose, an 11-stories structure located in vicinity of a certain fault with a characteristic magnitude is considered. According to the assumed site hazard; 1000 physically-based ground motion record is generated. The ground motion records are clustered based on their spectral features. As a result; a representative record is constructed by employing the cluster centers. The constructed record is used for tuning procedure. Results reveal that this method of tuning arises the seismic reliability index; comparing with the other well-known approaches. The robustness of the proposed approach is analyzed with more details.