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RISS 인기검색어
- 검색키워드
- 저자 : Ahmet Hilmi Deringöl (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
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Effect of Using High Damping Rubber Bearings for Seismic Isolation of the Buildings
Ahmet Hilmi Deringöl,Esra Mete Güneyisi 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.5
In this study, the use of high damping rubber bearing (HDRB) with various design properties in mitigating the seismic eff ects for steel buildings was investigated. For this, a generalized demand on the analytical model of HDRB was introduced and eighteen diff erent models of HDRB were examined comparatively. These models were created by considering three signifi cant isolation parameters of HDRB such as isolation period T (2, 2.5, and 3 s), eff ective damping ratio β (0.05, 0.10, 0.15), and post-yield stiff ness ratio λ (3 and 6). The benchmark low (3-storey), mid (6-storey), and high-rise (9-storey) steel buildings were equipped with diff erent isolation systems of HDRB and then subjected to a set of earthquake ground motions through nonlinear time history analyses in order to evaluate the actual nonlinear behaviour of the bearings in the base-isolated steel buildings in service. The base-isolated frames were assessed by the variation of the selected structural response parameters such as isolator displacement, relative displacement, inter-storey drift ratio, absolute acceleration, base shear, hysteretic curve, and dissipated energy. The eff ectiveness of the isolation parameters on the nonlinear response of the steel buildings with HDRB under earthquakes was comparatively evaluated to generate alternatively innovative isolation system. It was shown that the seismic performance of the base-isolated structure was remarkably infl uenced by the isolation parameters. The most favourable base isolation model was obtained when the higher value of the isolation period and eff ective damping ratio combined with the low post-yield stiff ness ratio.
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Ahmet Hilmi Deringöl,Esra Mete Güneyisi,Osman Hansu 한국강구조학회 2022 International Journal of Steel Structures Vol.22 No.5
Recently, the base isolation system (BIS) has been adopted as mature structural protective system which dissipates the most part of the input energy emerged during any type of seismic excitation. However, BIS can induce large displacement because of having easily movement tendency of the bearing. Therefore, this study proposes a set of BIS incorporated with supplementary damping device to control the nonlinear response of the buildings with low and moderate heights. For this, 5 and 10-storey steel moment resisting frames isolated with lead rubber bearing (LRB) with varying stiff ness properties (i.e. high, moderate, and low) were studied. Afterwards, viscous damper (VD) was designed with three diff erent damping exponents of 0.3, 0.6, and 1.0 so that they were alternatively distributed both in inner and corner bays throughout the building heights. The eff ectiveness of the proposed isolation models with and without VDs were evaluated through the nonlinear time history analyses under diff erent earthquake records. Advantages of the developed isolation systems over both the fi xed base and the base isolated frames were discussed in terms of the storey, bearing, and relative displacements, roof and interstorey drift ratios, absolute acceleration, base shear, and hysteretic curves. It was shown that low-stiff ness-LRB (LLRB) associated with the VD of proper damping exponent and implementation layout signifi cantly mitigated the structural response of the buildings.
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