Dynamic Responses of the Base-Fixed and Isolated Building Frames Under Far- and Near-Fault Earthquakes

Tavakoli, Hamidreza; Naghavi, Fahime; Goltabar, A.R.

doi:10.1007/s13369-013-0891-8

Cited by 19 publications

(11 citation statements)

References 5 publications

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“…In the literature (e.g. [26]- [28]), it is observed that the base displacements of the buildings with seismic isolation systems under far-fault earthquakes vary between 10 and 20 cm. Thus, the peak base displacement constraint is determined as 15 cm for far-fault earthquakes which may be considered as an economical design displacement value for far-fault regions.…”

Section: Rd Stagementioning

confidence: 99%

Teaching-Learning Based Optimization of Nonlinear Isolation Systems under Far Fault Earthquakes

2022

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Seismic isolation systems exposed to far-fault earthquakes can reduce floor accelerations and story drift ratios to acceptable levels. However, they exhibit different structural performances in each earthquake due to different excitation frequency contents. By optimizing the isolation system parameters, their performance may be maintained at the best level under different farfault earthquakes. In this study, the optimization of the parameters of the nonlinear isolation system of a 5-story benchmark building is performed by Teaching-Learning Based Optimization (TLBO) algorithm to minimize peak floor accelerations under historical farfault earthquakes with and without exceeding a specified base displacement limit. According to the results of the analyses, it can be said that TLBO algorithm is a robust algorithm with low standard deviations for determining optimum nonlinear isolation system parameters.

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Section: Rd Stagementioning

confidence: 99%

Teaching-Learning Based Optimization of Nonlinear Isolation Systems under Far Fault Earthquakes

2022

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“…These results indicate that LRB systems perform well against to earthquake effects [15][16][17][18][19]. In addition, the effects of the NF and FF ground motions were examined comparatively [1,20]. It is stated the LRB isolators were effective in decreasing the base shear force and relative interstory displacements were reduced by LRB isolator systems.…”

Section: Introductionmentioning

confidence: 96%

“…One of these methods is an LRB isolator. In the case of the proper application of the LRB, it is expected that the performance of the structure against to earthquakes will increase and also it will exhibit elastic behavior during the earthquake [1].…”

Section: Introductionmentioning

confidence: 99%

Seismic response of fixed-base and LRB base-isolated RC frame systems under NF and FF excitations

Komur¹,

Deneme²,

Oruç³

2019

JSEAM

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Seismic isolation systems can be used in new structures to reduce the negative effects of the earthquake on the building. The lead rubber bearing (LRB) is one of the most commonly used seismic isolators. This study focused on the behavior of Reinforced Concrete (RC) frame systems with fixed-base and Lead Rubber Bearing systems under Near-Fault (NF) and Far-Fault (FF) records. For this purpose, two-plane frame systems with 4 and 8 story were designed. Nonlinear behavior of both superstructure and isolation system was taken into consideration in modeling. The nonlinear time history analysis method was used in the seismic analysis of reinforced concrete frame systems. Finally, story acceleration, interstory drift ratio, base shear force and distribution of plastic hinges and their damage conditions were evaluated. The results of the analysis showed that the effects of the NF earthquake record on the frame system had generally greater according to the effects of the FF earthquake records.

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“…It boosts the floor acceleration, directing to the damage of structural as well as non-structural equipment, whereas by making the structure more flexible, reducing the floor acceleration and increasing the inter-storey drifts. Thus, base isolation helps to lower both floor accelerations and interstorey drifts at the same time [6][7][8][9]. Base isolation is accepted as one of the most trustful technique to secure the structures from strong ground motions techniques [10,11].…”

Section: Introductionmentioning

confidence: 99%

Seismic Assessment of Steel-frame Buildings Mounted with Base-Isolated System

2022

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A multi-Storey steel frame building against earthquakes has always been a challenge for structural engineering and researchers. Many seismic protection systems have been investigated overtime where the Base Isolation system has widely been used and implemented. It works on the principle of dissociation of substructure to the superstructure. In the present paper, different multi-storey steel frame buildings are evaluated, which are mounted with Lead Rubber Bearing (LRB) as a base isolator. LRB has been designed in compliance with the FEMA and ASCE guidelines. Further, a relative study is presented for evaluating the traditional fixed-base structure with a base-isolated building by performing a time history analysis. Base shear, inter-storey drift, acceleration, and displacements are examined as a result of the study. The outcome shows significant contributions towards reducing acceleration, inter-storey drift and base shear distributed over the floors. Moreover, LRB not only absorbs the seismic energy but also substantially decreases the destructive effect during an earthquake.

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Dynamic Responses of the Base-Fixed and Isolated Building Frames Under Far- and Near-Fault Earthquakes

Cited by 19 publications

References 5 publications

Teaching-Learning Based Optimization of Nonlinear Isolation Systems under Far Fault Earthquakes

Teaching-Learning Based Optimization of Nonlinear Isolation Systems under Far Fault Earthquakes

Seismic response of fixed-base and LRB base-isolated RC frame systems under NF and FF excitations

Seismic Assessment of Steel-frame Buildings Mounted with Base-Isolated System

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