Reliability-Based Optimal Design of Passive Controlled Systems

Fathi Azar, Nayereh and Mohebbi, Mohtasham and Gholizad, Amin (2015) Reliability-Based Optimal Design of Passive Controlled Systems. Masters thesis, university of Mohaghegh Ardabili.

Text (طراحی بهینه‌ی سازه‌های کنترل شده‌‌‌¬ی غیر فعال برمبنای قابلیت اعتماد) Nayereh Fathi Azar.pdf Download (284kB)

Abstract

Suppressing the structural dynamic vibration is one of the important task in civil engineering. To this end, structural vibration control techniques have been developed. One of the most widely used strategies for passive vibration control is based on applications of the tuned mass damper (TMD). A typical TMD, consisting of a mass, damping and spring which commonly attached to the protected primary structure for suppressing undesirable vibrations induced by external excitations. Mostly, the optimal parameters of TMD are determined using different approaches assuming deterministic system parameters. Due to the inherent uncertainties involved in different model parameters of structure and control system, conventional design optimization without considering uncertainties may result in unreliable designs. In this case, it is necessary to develop an optimization procedure considering uncertainties. One way to deal with this issue is reliability-based design optimization (RBDO), in which additional uncertainty analysis is required. In this research a method has been proposed to design the optimal TMD base on the minimization of the probability of failure considering the model’s parameter uncertainties where for the reliability analysis the Monte Carlo Simulation (MCS) has been used. Because of required extensive numerical analysis, in this work, Artificial Neural Network is applied to approximate the dynamic response. The optimization procedure is performed using Genetic Algorithm. To assess the effectiveness of the proposed method, a ten-storey shear building frame with linear behavior equipped with TMD has been considered. The mass, stiffness and damping of structure and TMD have been selected as random variables and subjected to different earthquake records. Base on the results of the research it has been concluded that the reliability based design method proposed in this study yields a safer design and increased structural reliability.

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