Effectiveness of mass–damper dynamic absorber on rocking block under one-sine pulse ground motion

2018 ◽  
Vol 98 ◽  
pp. 154-162 ◽  
Author(s):  
Angelo Di Egidio ◽  
Andrea M. de Leo ◽  
Giorgia Simoneschi
Keyword(s):  
Ground Motion ◽  
Rocking Block ◽  
Mass Damper ◽  
Dynamic Absorber

scholarly journals Effect of Frequency Characteristics of Ground Motion on Response of Tuned Mass Damper Controlled Inelastic Concrete Frame

Buildings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 74
Author(s):  
Md Motiur Rahman ◽  
Tahmina Tasnim Nahar ◽  
Dookie Kim
Keyword(s):  
Ground Motion ◽  
Structural Response ◽  
Tuned Mass Damper ◽  
Frequency Characteristics ◽  
Building Frames ◽  
Concrete Frame ◽  
Finite Element Software ◽  
Mass Damper ◽  
Lateral Displacements ◽  
Modal Mass

This paper investigates the performance of tuned mass damper (TMD) and dynamic behavior of TMD-controlled concrete structure considering the ground motion (GM) characteristics based on frequency content. The effectiveness of TMD in reducing the structural response and probability of collapse of the building frames are affected by the frequency characteristics of GMs. To attenuate the seismic vibration of the buildings, the TMD controlled building has been designed based on the modal analysis (modal frequencies and modal mass participation ratio). In this study, to investigate the performance of TMD, four different heights (i.e., 3, 5, 10, 20 stories) inelastic concrete moment-resisting frames equipped with TMDs are developed using an open-source finite element software. A series of numerical analyses have been conducted using sixty earthquakes classified into three categories corresponding to low, medium, and high-frequency characteristics of GMs. To evaluate the proposed strategy, peak lateral displacements, inter-story drift, and the probability of collapse using fragility analysis have been investigated through the structures equipped with and without TMD. The results appraise the effect of TMD and compare the seismic responses of earthquake frequency contents and the vibration control system of the inelastic building frames.

scholarly journals Development of a Houde Damper Using Magnetic Damping

1993 ◽  
Author(s):  
H. Kobayashi ◽  
S. Aida
Keyword(s):  
Small Amplitude ◽  
Permanent Magnets ◽  
Vibration Suppression ◽  
Tuned Mass Damper ◽  
Copper Plate ◽  
Magnetic Damping ◽  
Mass Damper ◽  
Dynamic Absorber ◽  
Large Amplitude Vibrations ◽  
Auxiliary Mass

Abstract This paper presents experimental results that demonstrate the vibration suppression effectiveness of a Houde damper, a type of dynamic absorber that contains an auxiliary mass and a damping element. The damper that was developed uses an eddy current brake consisting of a pair of permanent magnets and a copper plate which acts as a conductor. A vibration test using a straight piping model was used to show that the Houde damper is effective not only in reducing small amplitude vibrations, but large amplitude vibrations as well. Analytical calculations were used to establish that the precise tuning required for effective vibration suppression using a conventional dynamic absorber (that is, a passively tuned mass damper) is not necessary for the Houde damper.

Amplification of Rocking Due to Horizontal Ground Motion

2012 ◽  
Vol 28 (4) ◽  
pp. 1405-1421 ◽  
Author(s):  
Matthew J. DeJong
Keyword(s):  
Ground Motion ◽  
Energy Input ◽  
Ground Motions ◽  
Statistical Assessment ◽  
Rocking Block ◽  
Real Earthquake ◽  
Horizontal Ground Motion ◽  
Assessment Procedures ◽  
Earthquake Data ◽  
Rocking Response

This paper addresses the fundamental behavior of rocking structures by investigating the rate of energy input due to horizontal ground motion. This perspective indicates that the assumption of initial at-rest conditions may be inappropriate, and identifies ground motions which cause ‘rocking resonance’ for various constraints. Furthermore, the ability of multiple impulses to either reduce or amplify the rocking response is demonstrated, and motivates the use of statistical assessment procedures to predict rocking stability during earthquakes. In this context, past earthquake data is used to generate an array of synthetic earthquakes of a given intensity which are applied to determine the overturning probability of the rocking block. The results emphasize the time dependence of the rocking response. Finally, simulation of the rocking response to real earthquake records confirms that multiple impulse rocking amplification may be significant.

DGA-based approach for optimal design of active mass damper for nonlinear structures considering ground motion effect

2015 ◽  
Vol 24 (4) ◽  
pp. 045017 ◽  
Author(s):  
Mohtasham Mohebbi ◽  
Hamed Rasouli Dabbagh ◽  
Solmaz Moradpour ◽  
Kazem Shakeri ◽  
Karim Tarbali
Keyword(s):  
Optimal Design ◽  
Ground Motion ◽  
Nonlinear Structures ◽  
Active Mass ◽  
Mass Damper ◽  
Active Mass Damper ◽  
Motion Effect
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