Development of a rotation-based negative stiffness device for seismic protection of structures

2016 ◽  
Vol 23 (5) ◽  
pp. 853-867 ◽  
Author(s):  
Navid Attary ◽  
M Symans ◽  
S Nagarajaiah
Keyword(s):  
Numerical Simulation ◽  
Conceptual Development ◽  
Power Source ◽  
Negative Stiffness ◽  
Analytical Models ◽  
Seismic Protection ◽  
Different Types ◽  
Negative Stiffness Device ◽  
Control Devices ◽  
Simulation Results

Researchers worldwide have developed various semi-active control devices for seismic protection of structures. Most of these devices are electromechanical in nature and thus require a power source for their operation. In this paper, a newly developed rotation-based mechanical adaptive passive device is presented. These unique devices are able to mechanically change stiffness, either by adding positive or negative stiffness, by using different types of rotational elements. The devices are compact due to their use of rotational elements, facilitating their implementation in structures. The conceptual development of these devices is presented herein along with analytical models and numerical simulation results that demonstrate their potential for providing seismic protection. In addition, an extension of the stiffness modulation concept is introduced wherein damping is modulated.

Negative Stiffness Device for Seismic Protection of Structures

2013 ◽  
Vol 139 (7) ◽  
pp. 1124-1133 ◽  
Author(s):  
A. A. Sarlis ◽  
D. T. R. Pasala ◽  
M. C. Constantinou ◽  
A. M. Reinhorn ◽  
S. Nagarajaiah ◽  
...  
Keyword(s):  
Negative Stiffness ◽  
Seismic Protection ◽  
Negative Stiffness Device

A Unified Analytical Framework for Ship Domains

2009 ◽  
Vol 62 (4) ◽  
pp. 643-655 ◽  
Author(s):  
Ning Wang ◽  
Xianyao Meng ◽  
Qingyang Xu ◽  
Zuwen Wang
Keyword(s):  
Collision Avoidance ◽  
Traffic Engineering ◽  
Analytical Framework ◽  
Domain Model ◽  
Analytical Models ◽  
Collision Risk ◽  
Marine Traffic ◽  
Different Types ◽  
Domain Models ◽  
Simulation Results

Most of the existing typical ship domains have been comprehensively reviewed and classified. Most of these ship domains are described in a geometrical manner that is difficult to apply to practices and simulations in marine traffic engineering. According to different types of geometrical ship domains, we have proposed mathematical models, based on which a unified analytical framework has been established. It is feasible and practical for the analytical models to be applied to the assessment of navigational safety, collision avoidance and trajectory planning, etc. Finally, some computer simulations and comparative studies of the proposed domain model have been presented and the simulation results show that the uniform analytical framework for ship domains is effective and identical to the original geometrical ones. It should be noted that the analytical domain models could be directly applied in any collision risk, collision avoidance or VTS system while the geometrical ones would be more illustrative but less practical or analytical.

Numerical simulations of a highway bridge structure employing passive negative stiffness device for seismic protection

2014 ◽  
Vol 44 (6) ◽  
pp. 973-995 ◽  
Author(s):  
Navid Attary ◽  
Michael Symans ◽  
Satish Nagarajaiah ◽  
Andrei M. Reinhorn ◽  
Michael C. Constantinou ◽  
...  
Keyword(s):  
Numerical Simulations ◽  
Negative Stiffness ◽  
Seismic Protection ◽  
Highway Bridge ◽  
Bridge Structure ◽  
Negative Stiffness Device

Negative stiffness device for seismic protection of smart base isolated benchmark building

2017 ◽  
Vol 24 (11) ◽  
pp. e1968 ◽  
Author(s):  
Tong Sun ◽  
Zhilu Lai ◽  
Satish Nagarajaiah ◽  
Hong-Nan Li
Keyword(s):  
Negative Stiffness ◽  
Seismic Protection ◽  
Negative Stiffness Device

Periodicity and bifurcation of a bouncing ball system with rigidly connected harmonic limiters

2020 ◽  
pp. 2150066
Author(s):  
Ruihai Li ◽  
Ruiyang Qiu
Keyword(s):  
Numerical Simulation ◽  
Local Stability ◽  
Relative Velocity ◽  
Sufficient Conditions ◽  
Restitution Coefficient ◽  
Bifurcation Diagrams ◽  
Bouncing Ball ◽  
Periodic Movement ◽  
Different Types ◽  
Simulation Results

The bouncing ball system with two rigidly connected harmonic limiters is revisited in order to further analyze its periodic movement and bifurcation dynamics. By using the impulsive impact maps, we obtain several sufficient conditions for the existence and local stability of three different types of periodic orbits, respectively, and then plot the bifurcation diagrams in the space of the relative velocity and the restitution coefficient for different parameters of the limiter. The numerical simulation results are consistent with those of the theoretical analysis.

Variable Negative Stiffness Device for Seismic Protection of Building Structures through Apparent Weakening

2018 ◽  
Vol 144 (9) ◽  
pp. 04018090 ◽  
Author(s):  
Kenneth K. Walsh ◽  
Evan Boso ◽  
Eric P. Steinberg ◽  
John T. Haftman ◽  
W. Neil Littell
Keyword(s):  
Negative Stiffness ◽  
Seismic Protection ◽  
Building Structures ◽  
Negative Stiffness Device

Negative Stiffness Device for Seismic Protection of Structures: Shake Table Testing of a Seismically Isolated Structure

2016 ◽  
Vol 142 (5) ◽  
pp. 04016005 ◽  
Author(s):  
A. A. Sarlis ◽  
D. T. R. Pasala ◽  
Michael C. Constantinou ◽  
Andrei M. Reinhorn ◽  
Satish Nagarajaiah ◽  
...  
Keyword(s):  
Negative Stiffness ◽  
Seismic Protection ◽  
Shake Table ◽  
Shake Table Testing ◽  
Negative Stiffness Device ◽  
Seismically Isolated

Modified Adaptive Negative Stiffness Device with Variable Negative Stiffness and Geometrically Nonlinear Damping for Seismic Protection of Structures

2021 ◽  
pp. 2150107
Author(s):  
Huan Li ◽  
Jianchun Li ◽  
Yang Yu ◽  
Yancheng Li
Keyword(s):  
High Frequency ◽  
Nonlinear Damping ◽  
Frequency Region ◽  
Isolation Effect ◽  
Negative Stiffness ◽  
Seismic Protection ◽  
Linkage Mechanism ◽  
High Frequency Region ◽  
Negative Stiffness Device ◽  
Linear Damping

Adaptive negative stiffness device is one of the promising seismic protection devices since it can generate seismic isolation effect through negative stiffness when it is mostly needed and achieve similar vibration mitigation as a semi-active control device. However, the adaptive negative stiffness device generally combined with linear viscous damping underpins the drawback of degrading the vibration isolation effect during the high-frequency region. In this paper, a modified adaptive negative stiffness device (MANSD) with the ability to provide both lateral negative stiffness and nonlinear damping by configuring linear springs and linear viscous dampers is proposed to address the above issue. The negative stiffness and nonlinear damping are realised through a linkage mechanism. The fundamentals and dynamic characteristics of a SDOF system with such a device are analyzed and formulated using the Harmonic Balance Method, with a special focus on the amplitude–frequency response and transmissibility of the system. The system with damping nonlinearity as a function of displacement and velocity has been proven to have attractive advantages over linear damping in reducing the transmissibility in the resonance region without increasing that in the high-frequency region. The effect of nonlinear damping on suppressing displacement and acceleration responses is numerically verified under different sinusoidal excitations and earthquakes with different intensities. Compared with linear damping, the MANSD with nonlinear damping could achieve additional reductions on displacement and acceleration under scaled earthquakes, especially intensive earthquakes.

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