Development of Negative Stiffness Dampers for Seismic Protection

2011 ◽  
Vol 82 ◽  
pp. 645-650 ◽  
Author(s):  
Hirokazu Iemura ◽  
Akihiro Toyooka ◽  
Masaki Higuchi ◽  
Osamu Kouchiyama
Keyword(s):  
Large Scale ◽  
Control Method ◽  
Dynamic Performance ◽  
Relative Displacement ◽  
Shaking Table ◽  
Negative Stiffness ◽  
Control Force ◽  
Shaking Table Tests ◽  
Active Devices ◽  
Bridge Model

In the first part of this study, theoretical and numerical evaluation of negative stiffness appearing in the skyhook control is conducted. The skyhook control is widely known for the vibration control method in the mechanical engineering field. The skyhook control can also achieve absolute response reduction. In order to realize a negative stiffness, however, the control force that accelerates the deformation should be generated. At present, such a performance is achieved only by using loading actuators or semi-active devices with sophisticated controllers and sensors. In the second part of this research, a new damper realizing a negative stiffness and stable energy dissipation in a passive manner is proposed, and its dynamic performance is investigated through large-scale shaking table tests. It is confirmed that the innovative negative stiffness passive damper reduces both the absolute acceleration and the relative displacement of a bridge model.

Landslide dam deformation analysis under aftershocks using large-scale shaking table tests measured by videogrammetric technique

2015 ◽  
Vol 186 ◽  
pp. 68-78 ◽  
Author(s):  
Zhen-Ming Shi ◽  
You-Quan Wang ◽  
Ming Peng ◽  
Sheng-Gong Guan ◽  
Jian-Feng Chen
Keyword(s):  
Large Scale ◽  
Landslide Dam ◽  
Shaking Table ◽  
Deformation Analysis ◽  
Shaking Table Tests ◽  
Dam Deformation

Response Control Performance Evaluation of MR Damper by Shaking Table Tests and Real-Time Hybrid Tests

2008 ◽  
Vol 56 ◽  
pp. 212-217 ◽  
Author(s):  
Hideo Fujitani ◽  
Hiroaki Sakae ◽  
Mai Ito ◽  
Takeshi Hiwatashi
Keyword(s):  
Real Time ◽  
Sliding Mode ◽  
Structural Response ◽  
Mr Damper ◽  
Shaking Table ◽  
Magnetorheological Damper ◽  
Control Force ◽  
Building Structures ◽  
Shaking Table Tests ◽  
Hybrid Test

Magnetorheological damper (MR damper) has been expected to control the response of civil and building structures in recent years, because of its large force capacity and variable force characteristics. In this paper, a series of real-time hybrid test was conducted and the results of real time hybrid tests were compared to those of shaking table tests. To determine the control force of the MR damper, skyhook control and sliding mode control theory were employed. As the results, the validity of real-time hybrid test was verified. This paper describes the capability of MR damper to control the structural response.

Hybrid Active Wave/Mode Control of Space Prestressed Taut Cable Net Structures

2018 ◽  
Vol 10 (06) ◽  
pp. 1850062 ◽  
Author(s):  
Xiao-Fei Ma ◽  
Tuan-Jie Li ◽  
Zuo-Wei Wang
Keyword(s):  
Shape Control ◽  
Large Scale ◽  
Control Method ◽  
Wave Mode ◽  
Control Model ◽  
Force Balance ◽  
Control Force ◽  
Mode Control ◽  
Active Wave ◽  
Wave Control

The space environments and special mission demands require large-scale and high shape accuracy cable net structures. The vibration control is an essential issue for shape control and performance conservation of large flexible cable net structures. This paper investigates the hybrid active wave/mode control of space prestressed taut cable net structures. First, the traveling wave dynamic model of cable net structures is explored by elemental waveguide and propagation equations of cables together with force balance conditions and compatibility conditions of joints. Then, the active wave control model is established by using the assumption forms of wave controllers to adjust the mechanical boundaries of the controlled joints. Finally, the hybrid active wave/mode control model is proposed by constructing the mapping relationship between wave control force, modal damping and natural frequencies. The proposed control method is verified by a planar cable net structure and the results show that the hybrid active wave/mode control can give a better broadband vibration attenuation performance for space prestressed taut cable net structures.

scholarly journals Assessment of Aseismic Performance of Ballasted Track with Large-scale Shaking Table Tests

2011 ◽  
Vol 52 (3) ◽  
pp. 156-162 ◽  
Author(s):  
Takahisa NAKAMURA ◽  
Etsuo SEKINE ◽  
Yusuke SHIRAE
Keyword(s):  
Large Scale ◽  
Shaking Table ◽  
Shaking Table Tests ◽  
Ballasted Track

Seismic performance of helical piles in dry sand from large-scale shaking table tests

Géotechnique ◽  
2019 ◽  
Vol 69 (12) ◽  
pp. 1071-1085 ◽  
Author(s):  
Moustafa Khaled Elsawy ◽  
M. Hesham El Naggar ◽  
Amy Cerato ◽  
Ahmed Elgamal
Keyword(s):  
Seismic Performance ◽  
Large Scale ◽  
Shaking Table ◽  
Shaking Table Tests ◽  
Helical Piles ◽  
Dry Sand

scholarly journals LARGE-SCALE SHAKING TABLE TESTS ON A FOUR-STORY RC BUILDING

2011 ◽  
Vol 76 (669) ◽  
pp. 1961-1970 ◽  
Author(s):  
Takuya NAGAE ◽  
Kenichi TAHARA ◽  
Kunio FUKUYAMA ◽  
Taizo MATSUMORI ◽  
Hitoshi SHIOHARA ◽  
...  
Keyword(s):  
Large Scale ◽  
Shaking Table ◽  
Shaking Table Tests ◽  
Rc Building

Seismic Testing of a Long-Span Concrete Filled Steel Tubular Arch Bridge

2010 ◽  
Vol 456 ◽  
pp. 89-102 ◽  
Author(s):  
Wei Ming Yan ◽  
Yong Li ◽  
Yan Jiang Chen
Keyword(s):  
Dynamic Performance ◽  
Internal Force ◽  
Shaking Table ◽  
Structural System ◽  
Arch Bridge ◽  
Seismic Testing ◽  
Response Characteristics ◽  
Long Span ◽  
Bridge Model ◽  
Cfst Arch Bridge

Long-span bridges are always a multi-support structural system, and seismic ground motion can vary significantly over distances comparable to the length of such kind of bridges, so it’s difficult to carry out shaking table tests because of the restriction of the dimension and amount of shaking tables. This paper discusses the multiple sub-table cordwood system is used to conduct a study on the seismic testing of a three-span irregular Concrete filled steel tubular (CFST) arch bridge with the objective of investigating the dynamic performance of the bridge under spatial earthquake motions. The development and testing of the bridge model and selected experimental results are discussed then. The seismic response and response characteristics of acceleration, displacement, internal force, and strain of the structure under earthquake excitations are gained, which can provide test data and basis to evaluate the seismic performance of this CFST arch bridge or other similar structural system design.

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