Reliability of semi-active seismic isolation under near-fault earthquakes

Öncü-Davas, Seda; Alhan, Cenk

doi:10.1016/j.ymssp.2018.04.045

Cited by 25 publications

(4 citation statements)

References 46 publications

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“…According to the functioning of isolation systems, the use of these systems in soils with low shear wave velocity (soft), although they increase the damping of the entire system and, as a result, less energy is introduced into the structure, but due to the increase in the need to change the location that One of the main criteria for using these systems is that it always faces limitations. Therefore, the need to change location and move a lot in earthquakes near the fault due to the frequency content and special features of these records is one of the limitations of this system [17]. In recent years this issue may have been solved to some extent with additional dampers added to the isolation system, especially in bridges [18].…”

Section: Introductionmentioning

confidence: 99%

Building's Controlled Seismic Isolation by Using Upper Horizontal Dampers and Stiff Core

Jouneghani

Hosseini

Rohanimanesh

et al. 2023

Turkish Journal of Civil Engineering

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The fundamental period of the seismically isolated buildings may be close to that of the long period pulses of near-filed earthquakes, leading to very large lateral displacements in isolators, which in turn can considerably reduce the stability of isolators, increase the chance of collision of the isolated buildings to adjacent buildings, or even result in overturning of the isolated buildings. Therefore, it is important to control these types of buildings and reduce the amount of lateral displacement in their isolating system. In this study, by conducting a series of time history analyses for a set of five multi-story steel buildings with various numbers of stories from 3 to 14, each having a very stiff core structure and a set of crosswise viscous dampers, connecting the building structure to the core structure at the lowest and the top floors, as well as the same structures without the core structure and dampers, the effect of stiff core and dampers in reducing the lateral displacement at isolators has been shown. Results indicate that by the proposed technique, the lateral displacement of the base isolation system is significantly decreased particularly for low-rise buildings.

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Section: Introductionmentioning

confidence: 99%

Building's Controlled Seismic Isolation by Using Upper Horizontal Dampers and Stiff Core

Jouneghani

Hosseini

Rohanimanesh

et al. 2023

Turkish Journal of Civil Engineering

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“…At present, the specific implementation methods for the suppression of micro-vibration include passive vibration isolation, 11,12 semi-active vibration isolation, 13–16 active vibration isolation, 17,18 and active-passive integrated vibration isolation. 19–21 The active vibration isolation performance is mainly concentrated in the middle and low frequencies, and the passive vibration isolation performance is concentrated in the middle and high frequencies.…”

Section: Introductionmentioning

confidence: 99%

Design of micro-vibration suppression platform based on piezo-stack array intelligent structure

Wang

Zhang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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Micro-vibration seriously affects the precision and stability of precision mechanical systems. Aiming at the micro-vibration existing in the semiconductor package positioning system, this paper first designed an active-passive integrated actuator (APIA) based on piezo-stack array, which compensated the mechanical error through the piezo-stack array to improve its positioning accuracy. Based on the APIA, a 6-PUU parallel micro-vibration suppression platform (MVSP) was designed, in which the two APIAs were combined into one and installed on the lower platform along the tangential distribution of the circle, and then the kinematic model of the platform was established. Finally, the PID control algorithm was used to conduct vibration isolation experiments on the MVSP. The experimental results showed that the MVSP had good vibration isolation performance for micro-vibration, the vibration isolation frequency band was above 5 Hz, and the attenuation of micro-vibration signals was between 18% and 64%.

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“…Sensitivity analysis on nonlinear smart base-isolated structures equipped with an active tendon system controlled by the Proportional-Integral-Derivative (PID) controller is conducted in [31]. Considering a synthetic near-fault earthquake model and Monte Carlo simulation (MCS) method, Öncü-Davas and Alhan [32] studied the reliability analyses of semi-active isolation subjected to near-fault regions. However, there is a study gap in the probabilistic evaluation of the nonlinear base-isolated structures equipped with MR dampers.…”

Section: Introductionmentioning

confidence: 99%

Semi-active control of nonlinear smart base-isolated structures using MR damper: sensitivity and reliability analyses

Etedali¹,

Zamani²

2022

Smart Mater. Struct.

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Semi-active control of base-isolated structures using magneto-rheological (MR) dampers is well studied in recent years. However, there is a study gap for sensitivity and reliability analyses assessment of the structure in the literature. Besides, the reliability analysis of the structures based on the importance of the building from a user perspective categorized into three groups including very high, high, and medium is an interesting topic that is considered in this study. Extension of the study for the case of uncontrolled base-isolated structures and controlled ones in both passive-off and passive-on modes of the MR dampers and tuning the command voltage of the MR dampers by a multi-objective modified clipped optimal (MOMCO) controller are also addressed in this paper in different seismic hazard regions with different peak ground accelerations (PGAs). The Monte Carlo simulation (MCS)-based Sobol's indices and importance sampling (IS) method are applied for the sensitivity and reliability analyses, respectively. Studies are conducted on an 8-story nonlinear base-isolated structure. The sensitivity analyses show the main seismic responses are more influenced by the changing uncertainties of the stochastic ground acceleration; the mass, and stiffness of the structural model; and the yield force of the isolation system. MR dampers can significantly reduce the failure probabilities of the structures in different seismic hazard regions. By increasing seismic hazard, an increment is observed in failure probability. Enhancing the importance of the building from medium to very-high status leads to an increase in the failure probabilities of the structure in all cases. However, the performance of three control cases in reducing the failure probabilities of the structure is often increased. The MOMCO controller and passive-on mode represent fewer failure probabilities than the uncontrolled and passive-off mode in different seismic hazard regions and groups. However, the MOMCO gives the best performance in the reduction of failure probabilities.

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Reliability of semi-active seismic isolation under near-fault earthquakes

Cited by 25 publications

References 46 publications

Building's Controlled Seismic Isolation by Using Upper Horizontal Dampers and Stiff Core

Building's Controlled Seismic Isolation by Using Upper Horizontal Dampers and Stiff Core

Design of micro-vibration suppression platform based on piezo-stack array intelligent structure

Semi-active control of nonlinear smart base-isolated structures using MR damper: sensitivity and reliability analyses

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