Reliability Analysis of Semiactive Magnetorheological Dampers Subjected to Harmonic Excitations

Rahbari, Nima Mohajer; Talatahari, Siamak; Aalami, Mohammad Reza

doi:10.1155/2013/643927

Cited by 6 publications

(4 citation statements)

References 4 publications

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“…Future work should include material nonlinearity and other conditions of steel design codes in order to achieve more advanced and direct analysis of frames including tapered members. Also, reliability analysis of tapered mechanical components subjected to harmonic excitations can be accomplished, like Rahbari et al [16]. …”

Section: Discussionmentioning

confidence: 99%

Second-Order Nonlinear Analysis of Steel Tapered Beams Subjected to Span Loading

Hadidi

Azar

Marand

2014

Advances in Mechanical Engineering

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A second-order elastic analysis of tapered steel members with I-shaped sections subjected to span distributed and concentrated loadings is developed. Fixed end forces and moments as well as exact stiffness matrix of tapered Timoshenko-Euler beam are obtained with exact geometrical properties of sections. The simultaneous action of bending moment, shear, and axial force including − effects is also considered in the analysis. A computer code has been developed in MATLAB software using a power series method to solve governing second-order differential equation of equilibrium with variable coefficients for beams with distributed span loading. A generalized matrix condensation technique is then utilized for analysis of beams with concentrated span loadings. The accuracy and efficiency of the results of the proposed method are verified through comparing them to those obtained from other approaches such as finite element methods, which indicates the robustness and time saving of this method even for large scale frames with tapered members.

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Section: Discussionmentioning

confidence: 99%

Second-Order Nonlinear Analysis of Steel Tapered Beams Subjected to Span Loading

Hadidi

Azar

Marand

2014

Advances in Mechanical Engineering

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“…The reliability analysis makes the possibility of estimating the failure probability of the structures with pertinent uncertainties. Some studies in the literature have been conducted on bucklingresistant bracing [1], tuned mass damper [2,3], tuned liquid column dampers [4] viscoelastic dampers [5,6], U-shaped steel dampers [7], magneto-rheological (MR) dampers [8,9], self-centering buckling restrained braces [10].…”

Section: Introductionmentioning

confidence: 99%

“…8). The lateral stiffness coefficients of the superstructure floors from the first floor to the top floor are 514.33, 500.05, 471.47, 428.61, 371.46, 300.03, 214.31, 114.30 kN m −1 , respectively.…”

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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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“…Results indicated that the design procedure was reliable and the safety of CRSCs is provided; however, the probability failure for mid-rise CRSCs was more than low-rise archetypes. Recently, reliability analysis of different dampers in structures are investigated by simulation methods (Chakraborty and Roy, 2011;Dall'Asta et al, 2017;Rahbari et al, 2013;Xu and Li, 2016). Bagherkhani and Baghlani (2020) assessed the performance and reliability of magnetorheological (MR) fluid dampers in controlling torsional-lateral responses of irregular structures.…”

Section: Introductionmentioning

confidence: 99%

Reliability and reliability-based sensitivity analysis of self-centering buckling restrained braces using meta-models

Hashemi

Miri

Rashki

et al. 2021

Journal of Intelligent Material Systems and Structures

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This paper aims to carry out sensitivity analyses to study how the effect of each design variable on the performance of self-centering buckling restrained brace (SC-BRB) and the corresponding buckling restrained brace (BRB) without shape memory alloy (SMA) rods. Furthermore, the reliability analyses of BRB and SC-BRB are performed in this study. Considering the high computational cost of the simulation methods, three Meta-models including the Kriging, radial basis function (RBF), and polynomial response surface (PRSM) are utilized to construct the surrogate models. For this aim, the nonlinear dynamic analyses are conducted on both BRB and SC-BRB by using OpenSees software. The results showed that the SMA area, SMA length ratio, and BRB core area have the most effect on the failure probability of SC-BRB. It is concluded that Kriging-based Monte Carlo Simulation (MCS) gives the best performance to estimate the limit state function (LSF) of BRB and SC-BRB in the reliability analysis procedures. Considering the effects of changing the maximum cyclic loading on the failure probability computation and comparison of the failure probability for different LSFs, it is also found that the reliability indices of SC-BRB were always higher than the corresponding reliability indices determined for BRB which confirms the performance superiority of SC-BRB than BRB.

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Reliability Analysis of Semiactive Magnetorheological Dampers Subjected to Harmonic Excitations

Cited by 6 publications

References 4 publications

Second-Order Nonlinear Analysis of Steel Tapered Beams Subjected to Span Loading

Second-Order Nonlinear Analysis of Steel Tapered Beams Subjected to Span Loading

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

Reliability and reliability-based sensitivity analysis of self-centering buckling restrained braces using meta-models

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