Abstract
It has been seen that semiactive magnetorheological (MR) dampers are not sometimes reliable when employed in the building to contract acceleration demand of the stories. In the current paper, a three-storey sample building with semiactive MR dampers subjected to harmonic base excitation is taken under examination to clarify the reliability of such semiactive control systems in mitigation of absolute acceleration response of the buildings. Comparison between semiactively controlled building and uncontrolled original building is chosen as an implicit reliability limit-state function. Firstly, first-order reliability method (FORM) is engaged to examine the reliability of the system by linearizing the chosen nonlinear limit-state function. Afterwards, Monte Carlo simulation (MCS) is used to verify the obtained results by FORM method.
Highlights
Magnetorheological (MR) damper is a kind of semiactive control devices in which MR liquid is composed of magnetized tiny particles that are scattered in a mineral liquid such as silicon oil
Reliability of semiactive MR damper control system in mitigation of absolute acceleration of a three-storey building was studied in the current work
From the analyses conducted by first-order reliability method (FORM) and Monte Carlo simulation (MCS) methods, it can be concluded that MR dampers are almost reliable by more than 83.9% in terms of acceleration reduction of building due to base acceleration
Summary
Magnetorheological (MR) damper is a kind of semiactive control devices in which MR liquid is composed of magnetized tiny particles that are scattered in a mineral liquid such as silicon oil. The interesting objective of the current work is to analytically assess the reliability of semiactive MR damper control systems in reduction capability of acceleration demand for buildings subjected to base acceleration by means of existing reliability methods. For this purpose, a three-storey sample shear building is taken under examination. In terms of reliability analysis, the difference between acceleration response of controlled building and uncontrolled building resulting from time-history dynamic analysis is considered as the implicit limit-state function. All structural simulations and reliability analyses are coded in MATLAB platform
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