Optimized negative stiffness damper with flexible support for stay cables

2021 ◽  
Author(s):  
Peng Zhou ◽  
Min Liu ◽  
Hui Li
Keyword(s):  
Negative Stiffness ◽  
Flexible Support ◽  
Stay Cables

Single input magnetorheological pseudo negative stiffness control for bridge stay cables

2020 ◽  
Vol 30 (1) ◽  
pp. 015032
Author(s):  
Yan-Wei Xu ◽  
Zhao-Dong Xu ◽  
Ying-Qing Guo ◽  
Xing-Huai Huang ◽  
Jie Zhang ◽  
...  
Keyword(s):  
Negative Stiffness ◽  
Stay Cables ◽  
Single Input ◽  
Stiffness Control

Dynamic behavior of stay cables with passive negative stiffness dampers

2016 ◽  
Vol 25 (7) ◽  
pp. 075044 ◽  
Author(s):  
Xiang Shi ◽  
Songye Zhu ◽  
Jin-Yang Li ◽  
Billie F Spencer
Keyword(s):  
Dynamic Behavior ◽  
Negative Stiffness ◽  
Stay Cables

Feasibility of Using a Negative Stiffness Damper to Two Interconnected Stay Cables for Damping Enhancement

2019 ◽  
Vol 19 (06) ◽  
pp. 1950058 ◽  
Author(s):  
Peng Zhou ◽  
Min Liu ◽  
Huigang Xiao ◽  
Hui Li
Keyword(s):  
Dynamic Behavior ◽  
Dynamic Responses ◽  
Negative Stiffness ◽  
Cable Stayed Bridge ◽  
Long Span ◽  
Stay Cables ◽  
Modal Damping ◽  
Vibration Responses ◽  
White Noises ◽  
Cable Stayed Bridges

The dynamic behavior of stay cables has a significant impact on the safety and serviceability of cable-stayed bridges. As tuning such dynamic behavior could be effectively achieved by a damping increase on stay cables, this paper investigates on the feasibility of increasing damping on two stay cables simultaneously through interconnecting them with a negative stiffness damper (NSD). It presents the passive realization of the NSD through the following process. First, under harmonic excitations, the steady-state dynamic responses of the two cables in the network are derived. Then, the asymptotic solutions for the additional modal damping ratios are formulated with the critical viscous damping and negative stiffness determined approximately. Subsequently, a parametric analysis is performed to verify the theoretical derivations using two stay cables of a real long-span cable-stayed bridge, under a series of numerical evaluations consisting of sinusoidal excitations and white noises vibrational responses for both cables. Both the theoretical and numerical results show superior damping enhancement by the NSD, in that the vibration responses of the two cables are reduced remarkably.

scholarly journals Design and evaluation of a quasi-zero-stiffness isolator using flexibly supported negative stiffness mechanism

2021 ◽  
Vol 233 ◽  
pp. 03052
Author(s):  
Yu Lou ◽  
Peng Zhou
Keyword(s):  
Parametric Analysis ◽  
Design Method ◽  
External Disturbance ◽  
Cost Effective ◽  
Negative Stiffness ◽  
Equivalent Model ◽  
Isolation System ◽  
Flexible Support ◽  
Negative Stiffness Mechanism ◽  
Effective Design

In traditional quasi-zero-stiffness (QZS) isolation system, the negative stiffness part is usually fixed rigidly, lacking of effective amplifying mechanism. For reaching a quasi-zero state, the value of negative stiffness need to be very large to offset the positive stiffness of the structure. This paper proposes a novel isolator incorporating a flexible support to magnify negative stiffness part for effective realization of quasi-zero state. First, the concept and formulation of the innovative quasi-zero isolator are presented. Equivalent model for the flexibly supported negative stiffness part is established, followed by a parametric analysis to reveal the amplification effect. Thereafter, a design method is developed and numerical simulation is performed to verify the isolating performance. The results show that a flexible support enlarges the negative stiffness remarkably, thereby resulting in a cost-effective design. The optimized QZS isolator is capable of isolating external disturbance significantly.

Development in testing of stay cables

2001 ◽  
Vol 84 (10) ◽  
pp. 57-64 ◽  
Author(s):  
Konrad Zilch ◽  
Christian Glaeser
Keyword(s):  
Stay Cables
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