scholarly journals Optimal Damper Slip Force for Vibration Control Structures Incorporating Friction Device with Sway-Rocking Motion Obtained Using Shaking Table Tests

2019 ◽  
Vol 2019 ◽  
pp. 1-13
Author(s):  
Kazutaka Shirai ◽  
Akari Nagaoka ◽  
Nami Fujita ◽  
Takeshi Fujimori
Keyword(s):  
Vibration Control ◽  
Passive Control ◽  
Shaking Table ◽  
Steel Plates ◽  
Shaking Table Tests ◽  
Control Structures ◽  
Mean Square Response ◽  
Rocking Motion ◽  
Slip Force

In this study, a series of shaking table tests were conducted using a specimen that consisted of a superstructure, incorporating a friction device and a sway-rocking mechanism under the superstructure to determine the optimal damper slip force of a passive vibration control system considering the effects of sway-rocking motion. The adopted simple friction device, composed of rubber bands and stainless steel plates, allowed the magnitude of the slip force to be easily set. The optimal slip force of the friction device, which minimizes the peak and root-mean-square response of the superstructure subjected to earthquakes, was determined from the shaking table tests. Based on the results, the optimal slip force of the friction device was found to vary according to the input level of the ground motions and the sway-rocking conditions. The obtained results suggest that the effect of sway-rocking motion should be considered in the design of passive control structures and the determination of their optimal damper slip force.

scholarly journals EVALUATION OF PASSIVE CONTROL SYSTEM FOR WOODEN HOUSES : VERIFICATION OF SUMMATION RULE AND EVALUATION OF DYNAMIC PROPERTIES BY SHAKING TABLE TESTS

2014 ◽  
Vol 20 (45) ◽  
pp. 539-544
Author(s):  
Toshiaki SATO ◽  
Takenori HIDA ◽  
Jun KATO ◽  
Michio IGUCHI ◽  
Yuichi MASAKI ◽  
...  
Keyword(s):  
Control System ◽  
Passive Control ◽  
Dynamic Properties ◽  
Shaking Table ◽  
Shaking Table Tests ◽  
Summation Rule

scholarly journals Shaking Table Test on Different Positions of Multiple Tuned Liquid Damper

2019 ◽  
Vol 9 (1) ◽  
pp. 5863-5867
Keyword(s):  
Control System ◽  
Wave Breaking ◽  
Passive Control ◽  
Shaking Table Test ◽  
Steel Frame ◽  
Shaking Table ◽  
Shaking Table Tests ◽  
Tuned Liquid Damper ◽  
Passive System ◽  
Water Tanks

Earthquake can cause many problems to the structures, which lead to buildings collapse and may takes humans life. It is a nature’s hazard that cannot be stop. One of the effort is by introducing the damping system to the buildings where the energy of the system is slowly reduced until the vibration of the system is totally eliminated and the system is brought to rest. Several techniques are available nowadays, however passive control system has advantage in term of cost compare to other systems. Multiple Tuned Liquid Damper (MTLD) is a passive system that traditionally made of several rigid tanks filled with water, usually placed on top of a building. The energy will dissipates through the sloshing and wave-breaking of the liquid once the earthquake strike the buildings. Shaking table tests are carried out on a two-bay, two-story steel frame with water tanks for different location. In this test, the displacement and acceleration for top and base are studied.

Shaking Table Tests of a Full Scale Steel Structure Isolated With MFPS

2003 ◽  
Author(s):  
C. S. Tsai ◽  
Tsu-Cheng Chiang ◽  
Bo-Jen Chen
Keyword(s):  
Earthquake Engineering ◽  
Stress Responses ◽  
Passive Control ◽  
Base Isolation ◽  
Experimental Results ◽  
Shaking Table ◽  
Element Formulation ◽  
Shaking Table Tests ◽  
Pendulum System ◽  
Residual Displacements

The base isolation, a kind of passive control technology, has been proved as a very efficient way to ensure the safety of a structure during severe earthquakes both from theoretical study and experimental effort. In general, the base isolation can be classified into two groups, which are sliding type and elastomeric type isolator. In this study, a new base isolator called as Multiple Friction Pendulum System (MFPS) has been proposed. The lubricant material, articulated slider and doubled concave sliding interfaces of MFPS are quite different from that proposed by V. Zayas in 1987. In this study, the MFPS isolator has been equipped beneath each column of a three-story structure at the National Center for Research on Earthquake Engineering to demonstrate its seismic resistance capability. The experimental results from shaking table tests of the 1940 El Centro, 1995 Kobe and 1999 Chi-Chi earthquake show that the proposed isolator can reduce the undesirable seismic response of the structure by lengthening the fundamental period of the structure during earthquakes. The experimental results indicate that the acceleration response of each floor can be lessened significantly as compared with those of the bare structure, and that the stress responses of structural components are limited in the certain range during severe earthquakes. Furthermore, the residual displacements of base isolators are negligible. Therefore, it is shown evidently that the proposed isolator can always bring the base-isolated structure to its initial position after an earthquake. Based on the previous observations, the proposed isolator can be adopted as an effective tool for upgrading the seismic resistibility of a structure. A finite element formulation for the MFPS is also proposed to simulate its mechanical behavior during earthquakes.

scholarly journals Seismic Performance of Ni-Ti SMA Wires Equipped in the Spatial Skeletal Structure

2021 ◽  
Vol 8 ◽  
Author(s):  
Yang Liu ◽  
Tao Yang ◽  
Binbin Li ◽  
Bo Liu ◽  
Wentao Wang ◽  
...  
Keyword(s):  
Numerical Model ◽  
Vibration Control ◽  
Seismic Performance ◽  
Passive Control ◽  
Shaking Table Test ◽  
Experimental Tests ◽  
Shaking Table ◽  
Dynamic Responses ◽  
Skeletal Structure ◽  
Performance Study

Nickel Titanium (Ni-Ti) Shape Memory Alloy (SMA) can be used to limit response of structure during external disturbances such as large seismic events. This paper presents a seismic performance study of Ni-Ti SMA wires equipped in the spatial skeletal structure. First, an improved Graesser-Cozzarelli (G-C) numerical constitutive model of the Austenitic phase of NiTi SMA wire is established. By contrast, the model based on uniaxial cyclic loading experimental tests is demonstrated as feasibility and validity. Next, a method consisting of a three-layer steel spatial skeletal structure model equipped with SMA wires is employed for simulation and experimental tests. According to the obtained constitutive numerical model, the simulation program of vibration control is written to simulate the effect of vibration control of seismic EL-centro wave. Furthermore, a shaking table experimental test was designed to verify the vibration control effect under the same action of seismic EL-centro wave. By comparison of the results of the numerical simulation and shaking table test, dynamic responses of the displacement and acceleration for different floors with control and without control was concluded. The superior superelastic properties of SMA wires used in passive control are investigated and the correctness of the constitutive numerical model are verified as well. The results show that such a comprehensive analysis integrates seismic-resistant behavior of Ni-Ti SMA wires in this type of structure. Besides, proposed method has broad application prospects to address the issues in passive control field of building structures.

scholarly journals Low-cost hybrid design of masonry structures for developing countries: Shaking table tests

2021 ◽  
Vol 146 ◽  
pp. 106675
Author(s):  
Anastasios Tsiavos ◽  
Anastasios Sextos ◽  
Andreas Stavridis ◽  
Matt Dietz ◽  
Luiza Dihoru ◽  
...  
Keyword(s):  
Developing Countries ◽  
Low Cost ◽  
Shaking Table ◽  
Hybrid Design ◽  
Masonry Structures ◽  
Shaking Table Tests

Shaking-table tests of seismic responses of slender intake tower-hoist chamber systems

2021 ◽  
Vol 242 ◽  
pp. 112517
Author(s):  
Hanyun Zhang ◽  
Cai Jiang ◽  
Shuming Liu ◽  
Liaojun Zhang ◽  
Chen Wang ◽  
...  
Keyword(s):  
Shaking Table ◽  
Shaking Table Tests ◽  
Seismic Responses
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