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 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

Experimental Shake Table Testing of an Adaptive Passive Negative Stiffness Device within a Highway Bridge Model

2015 ◽  
Vol 31 (4) ◽  
pp. 2163-2194 ◽  
Author(s):  
Navid Attary ◽  
Michael Symans ◽  
Satish Nagarajaiah ◽  
Andrei M. Reinhorn ◽  
Michael C. Constantinou ◽  
...  
Keyword(s):  
Numerical Models ◽  
Shaking Table ◽  
Negative Stiffness ◽  
Highway Bridge ◽  
Viscous Dampers ◽  
Isolation System ◽  
Bridge Model ◽  
Negative Stiffness Device ◽  
Model Components ◽  
Isolated Bridge

The implementation of a mechanical negative stiffness device (NSD) within a reduced-scale highway bridge model and its performance under seismic loading conditions is evaluated via shaking table tests. Four different isolation system configurations are considered: isolated bridge (IB), IB with viscous dampers, IB with NSDs, and IB with viscous dampers and NSDs. In addition, two bridge pier configurations were considered: one with flexible piers (mimicking a middle span of a multi-span bridge) and one with braced piers (mimicking a single span bridge supported on abutments). The main feature of the NSD is a large pre-compressed spring, which can push the structure away from its initial undeformed position and thus induce negative stiffness behavior. The experimental results clearly demonstrate the effectiveness of the NSDs in limiting the seismic response of the bridge and provide validation of numerical simulation results wherein numerical models of the bridge model components were calibrated via system identification testing.

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

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

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: 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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