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Earthquakes and Structures
  Volume 15, Number 3, September 2018 , pages 319-334

Effects of the isolation parameters on the seismic response of steel frames
Ahmet H. Deringol and Huseyin Bilgin

    In this paper, an analytical study was carried out to propose an optimum base-isolated system for the design of steel structures equipped with lead rubber bearings (LRB). For this, 5 and 10-storey steel moment resisting frames (MRFs) were designed as Special Moment Frame (SMF). These two-dimensional and three-bay frames equipped with a set of isolation systems within a predefined range that minimizes the response of the base-isolated frames subjected to a series of earthquakes. In the design of LRB, two main parameters, namely, isolation period (T) and the ratio of strength to weight (Q/W) supported by isolators were considered as 2.25, 2.5, 2.75 and 3 s, 0.05, 0.10 and 0.15, respectively. The Force-deformation behavior of the isolators was modelled by the bi-linear behavior which could reflect the nonlinear characteristics of the lead-plug bearings. The base-isolated frames were modelled using a finite element program and those performances were evaluated in the light of the nonlinear time history analyses by six natural accelerograms compatible with seismic hazard levels of 2% probability of exceedance in 50 years. The performance of the isolated frames was assessed in terms of roof displacement, relative displacement, interstorey drift, absolute acceleration, base shear and hysteretic curve.
Key Words
    base isolation; lead rubber bearing; moment resisting frame; non-linear analysis; structural response control
Ahmet H. Deringol: Department of Civil Engineering, Gaziantep University, 27310, Gaziantep, Turkey
Huseyin Bilgin: Department of Civil Engineering, Epoka University, Tirana, Albania

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