Experimental Tests of Longitudinal Added Damping and Stiffness Device

2005 ◽  
Author(s):  
C. S. Tsai ◽  
Guan-Hsing Lee ◽  
Wen-Shin Chen ◽  
Li-Te Hsu
Keyword(s):  
Seismic Response ◽  
Passive Control ◽  
Seismic Energy ◽  
Experimental Tests ◽  
Shaking Table ◽  
Hysteretic Behavior ◽  
New Device ◽  
Component Test ◽  
Incremental Form ◽  
Energy Absorbing

Structural passive control technology has been developed rapidly over the past decade, and proven as a feasible and promising way in mitigating the seismic response of a structure. In numerous passive control devices, the added damping and stiffness (ADAS) has been verified as an effective and economical energy-absorbing device to dissipate the seismic energy. Successful applications have also been achieved in Taiwan. A new device named as the longitudinal added damping and stiffness (LADAS) has been developed in this study. The component test shows that the LADAS device can sustain an extremely large number of yielding reversals without any sign of stiffness or strength degradation and has stable energy-dissipating capability. The comparison of analytical and experimental results illustrates that the Wen’s model in an incremental form could successfully predict the hysteretic behavior of LADAS device. Moreover, the earthquake proof efficiency of the LADAS was carried out on a scaled-down three steel frame on a shaking table in Feng Chia University, Taichung, Taiwan. The experiment result demonstrates that a structure with LADASs can significantly reduce the seismic response.

Comparative dynamic investigation of cross-laminated wooden panel systems: Shaking-table tests and analysis

2017 ◽  
Vol 21 (10) ◽  
pp. 1421-1436 ◽  
Author(s):  
Viktor Hristovski ◽  
Violeta Mircevska ◽  
Bruno Dujic ◽  
Mihail Garevski
Keyword(s):  
Energy Dissipation ◽  
Earthquake Engineering ◽  
Dynamic Properties ◽  
Seismic Energy ◽  
Experimental Tests ◽  
Shaking Table ◽  
Shaking Table Tests ◽  
Equivalent Viscous Damping ◽  
Cross Laminated Timber ◽  
Engineering Seismology

Cross-laminated timber has recently gained great popularity in earthquake-prone areas for construction of residential, administrative, and other types of buildings. At the Laboratory of the Institute of Earthquake Engineering and Engineering Seismology in Skopje, comparative full-scale shaking-table tests of cross-laminated timber panel systems have been carried out as a part of the full research program on the seismic behavior of these types of wooden systems, realized by Institute of Earthquake Engineering and Engineering Seismology, Skopje, and the Faculty of Civil and Geodetic Engineering (UL FCG), University of Ljubljana. Two different specimens built of cross-laminated timber panels have been tested: specimen containing a pair of single-unit principal wall elements (Specimen 1) and specimen containing a pair of two-unit principal wall elements (Specimen 2). In this article, the results from the shaking-table tests obtained for Specimen 2 and numerically verified by using appropriate finite element method–based computational model are discussed. Reference is also made to the comparative analysis of the test results obtained for both specimens. One of the most important aspects of the research has been the estimation of the seismic energy-dissipation ability of Specimen 1 and 2, via calculation of the equivalent viscous damping using the performed experimental tests. It is generally concluded that Specimen 2 exhibits a similar rocking behavior as Specimen 1, with similar energy-dissipation ability. Both specimens have manifested slightly different dynamic properties, mostly because Specimen 2 has been designed with one anchor more compared to Specimen 1. Forced vibration tests have been used for identification of the effective stiffness on the contacts for Specimen 2. This research is expected to be a contribution toward clarification of the behavior and practical design of cross-laminated timber panel systems subjected to earthquake loading.

scholarly journals EXPERIMENTAL BEHAVIOUR OF A LOW-COST SEISMIC ENERGY DISSIPATION DEVICE

2020 ◽  
pp. 65-81
Author(s):  
Héctor Guerrero Bobadilla ◽  
Emmanuel Zamora Romero ◽  
Jose Alberto Escobar Sánchez ◽  
Roberto Gómez Martínez
Keyword(s):  
Energy Dissipation ◽  
Low Cost ◽  
Structural Response ◽  
Seismic Energy ◽  
Experimental Tests ◽  
Hysteretic Behavior ◽  
Dissipated Energy ◽  
High Tech ◽  
Seismic Safety ◽  
Existing Structures

Safety during earthquakes should be a human right and shall be accessible not only to those who can pay for proprietary high-tech devices but to everyone. Based on that, this study has been developed with the intention of helping to improve the seismic safety in the developing world. Within this paper, a low-cost, low-tech seismic energy dissipation device is proposed. Its experimental behavior under seismic loading is assessed. The device type is buckling-restrained brace (BRB) and, according to its characteristics, it is suitable for new and existing, medium- to low-rise structures. First, the device characteristics and fabrication process are presented. Then, its structural response, in terms of the hysteretic behavior, ductility, and dissipated energy – as obtained from experimental tests – is shown. Experimental results show an excellent behavior of the proposed device. As a result, it can be said that the device is reliable and its use is recommended for new, and retrofitting/upgrading existing, structures. Design recommendations are also provided.

Experimental Study for a New Energy Dissipation Device: Multiple-Direction Damper

2002 ◽  
Author(s):  
C. S. Tsai ◽  
L. L. Chung ◽  
T. C. Chiang ◽  
B. J. Chen ◽  
W. S. Chen
Keyword(s):  
Energy Dissipation ◽  
Passive Control ◽  
Steel Structure ◽  
Experimental Results ◽  
Shaking Table ◽  
New Energy ◽  
Seismic Loadings ◽  
Control Technologies ◽  
Energy Dissipation Devices ◽  
Energy Absorbing

The way of passive control technologies has been recognized as an excellent method to mitigate seismic responses of structures during seismic excitations. In general, the energy dissipation devices based on their own mechanical property can be divided into two categories, which are velocity-dependent and displacement-dependent devices. In this study, a new displacement-dependent device which is called multiple-direction damper is proposed. The proposed damper has numerous advantages: (1) the fabrication of this energy-absorbing device is effortless; (2) the construction of the energy-absorbing system is easy; (3) it is simple to install the device into a structure; (4) the material used for this damper is easy to obtain; and (5) if any damage occurs in this damper during strong excitations, this energy-absorbing device can be replaced easily to recover its energy dissipation capacity. Experimental results from component tests show that the proposed damper provides significant energy-absorbing capacity. Furthermore, the multiple-direction dampers have also been equipped into a 5-story steel structure to demonstrate its efficiency on seismic mitigation. The experimental results from shaking table tests indicate that most of earthquake-induced energy imparted into the structure is dissipated by the proposed dampers. In the meanwhile, the seismic loadings imposing on the structure with devices can be reduced effectively as compared with those of the bare structure. Therefore, the multiple-direction damper can be recognized as an effective tool to assure the safety of structure under strong ground motions.

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.

Shaking Table Test Study on Mid-Story Isolation Structures

2012 ◽  
Vol 446-449 ◽  
pp. 378-381
Author(s):  
Jian Min Jin ◽  
Ping Tan ◽  
Fu Lin Zhou ◽  
Yu Hong Ma ◽  
Chao Yong Shen
Keyword(s):  
Seismic Response ◽  
Seismic Isolation ◽  
Shaking Table Test ◽  
Base Isolation ◽  
Shaking Table ◽  
Natural Period ◽  
Isolation System ◽  
Isolation Layer ◽  
Lead Rubber Bearing ◽  
Complex Structural

Mid-story isolation structure is developing from base isolation structures. As a complex structural system, the work mechanism of base isolation structure is not entirely appropriate for mid-story isolation structure, and the prolonging of structural natural period may not be able to decrease the seismic response of substructure and superstructure simultaneously. In this paper, for a four-story steel frame model, whose prototype first natural period is about 1s without seismic isolation design, the seismic responses and isolation effectiveness of mid-story isolation system with lead rubber bearing are studied experimentally by changing the location of isolation layer. Respectively, the locations of isolation layer are set at bottom of the first story, top of the first story, top of the second story and top of the third story. The results show that mid-story isolation can reduce seismic response in general, and substructure acceleration may be amplified.

scholarly journals ANALYSIS OF A CANTILEVER COLUMN SUBJECTED TO CYCLIC LOADING

2020 ◽  
Vol 1 (2) ◽  
pp. 38-39
Author(s):  
Tran Tuan Nam
Keyword(s):  
Cyclic Loading ◽  
Local Buckling ◽  
Hysteretic Behavior ◽  
Steel Columns ◽  
Buckling Behavior ◽  
Column Wall ◽  
Component Test ◽  
Element Approach ◽  
Hinge Zone ◽  
Analytical Result

In a seismic incident, the structural steel columns are commonly damaged with local buckling formulation at either the top or bottom ends. This study analyzes and simulates the hysteretic behavior of a hollow square steel column under cyclic loading by adopting the fiber-element approach. This method discretizes the hinge zone into a series of fibers and considers buckling behavior of those fibers along the column wall. The analytical result was achieved in good agreement with the component test.

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