Buy article PDF
Instant access to
the full article PDF
for the next 48 hrs
US$ 35
|
Earthquakes and Structures Volume 15, Number 3, September 2018, pages 319-334 DOI: http://dx.doi.org/10.12989/eas.2018.15.3.319 |
|
|
|
Effects of the isolation parameters on the seismic response of steel frames |
||
Ahmet H. Deringol and Huseyin Bilgin
|
||
| Abstract | ||
| 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 | ||
| Address | ||
| Ahmet H. Deringol: Department of Civil Engineering, Gaziantep University, 27310, Gaziantep, Turkey Huseyin Bilgin: Department of Civil Engineering, Epoka University, Tirana, Albania | ||