AN EXPERIMENTAL STUDY OF IN-PLANE, ARCH-SHAPED FLEXURAL DAMPER

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Yen-Po Wang ◽  
Di-Hung Chen ◽  
Chien-Liang Lee
Keyword(s):  
Experimental Study ◽  
Stress Concentration ◽  
Seismic Performance ◽  
Shaking Table ◽  
Seismic Protection ◽  
Building Structures ◽  
Shaking Table Tests ◽  
Earthquake Intensity ◽  
Component Test ◽  
Portal Frame

An innovative displacement-dependent metallic yielding damper designed to deform inelastically under in-plane flexural bending for seismic protection of building structures is proposed. The in-plane flexural damper that originated from a portal frame is modified by replacing the beam with a circular arch so that the effect of stress concentration can be minimized. Component tests of the in-plane dampers were conducted and compared with analytical results. Hysteresis of the component test indicates a consistent energy-dissipative characteristic of the damper. Moreover, seismic performance of the proposed damper via a series of shaking table tests was carried out. Excellent seismic performance of the proposed in-plane arched damper was observed. The acceleration responses in both peak and root-mean-squares of all floors are significantly reduced, and were greater in extent compared to the earthquake intensity increases.

Seismic Testing of In-Plane Flexural Damper in Arched-Shape

2014 ◽  
Vol 1065-1069 ◽  
pp. 1117-1120
Author(s):  
Chia Shang Chang Chien ◽  
Wei Yuan Wang ◽  
Ging Huei Huang ◽  
Yen Po Wang
Keyword(s):  
Seismic Performance ◽  
Performance Test ◽  
Shaking Table ◽  
Building Structures ◽  
Earthquake Intensity ◽  
Seismic Damper ◽  
Modal Damping ◽  
Component Test ◽  
Out Of Plane ◽  
Material Utilization

This study proposes an innovative displacement-dependent metallic yielding damper for seismic protection of building structures. The damper is designed to deform inelastically under in-plane flexural bending and becomes energy-dissipative with an improved efficiency in terms of material utilization, as compared with those designed to bend in an out-of-plane manner. Both component test and seismic performance test of the proposed damper have been conducted in this study. Hysteresis of the component test indicates consistent and effective energy-dissipative characteristics of the damper. The contour of cracks on the surface of the damper after testing is well correlated with the stress distribution obtained from numerical analysis. Moreover, excellent seismic performance of the proposed in-plane arched damper has been demonstrated via a series of shaking table tests on a five-story model structure. Experimental results indicate that, with the dampers implemented, the acceleration responses in both peak and root-mean-squares of all floors are significantly reduced and more pronounced with the earthquake intensity increased. Effectiveness of the seismic damper is also revealed from the increase of the effective modal damping of all modes identified.

scholarly journals Seismic Protection of Cabinet Stored Cultural Relics with Silicone Dampers

2018 ◽  
Vol 2018 ◽  
pp. 1-15
Author(s):  
Xiaoqing Ning ◽  
Junwu Dai ◽  
Wen Bai ◽  
Yongqiang Yang ◽  
Lulu Zhang
Keyword(s):  
Numerical Simulation ◽  
Seismic Performance ◽  
Shaking Table ◽  
Seismic Protection ◽  
Shaking Table Tests ◽  
Seismic Methods ◽  
Cultural Relics

Cultural relics are precious properties of all humankind, the damage of which is nonresilient. In previous earthquakes, stored cultural relics have shown poor seismic performance, so effective seismic methods are urgently needed. However, due to various restrictions, traditional damping methods are not suitable for the cultural relics stored in the Palace Museum. An efficient damping method, composed of silicone damper and connecting elements, is proposed to protect these stored cultural relics. This novel damping device is very convenient to install and no change or move for the original structures is needed. It is suitable for various kinds of new and existing relic cabinets. In order to validate the effectiveness of this novel damping method, both numerical simulation and shaking table tests are carried out. Results show that this method can effectively enhance the seismic performance of relic cabinet itself and the internal cultural relics. Relic cabinets with damping devices deform significantly less than noncontrol cabinets while the inside relics also have less sliding or overturning. Overall, a damping method, designed for seismic protection of cabinet stored cultural relics, is proposed and its effectiveness has been successfully demonstrated.

scholarly journals Experimental estimation of energy dissipated by multistorey post-tensioned timber framed buildings with anti-seismic dissipative devices

2021 ◽  
Vol 1 (2) ◽  
Keyword(s):  
Seismic Performance ◽  
Environmental Sustainability ◽  
Shaking Table ◽  
Shaking Table Tests ◽  
Braced Frame ◽  
Timber Frame ◽  
Experimental Estimation ◽  
Energy Dissipated ◽  
The University ◽  
Post Tensioned

The need to satisfy high seismic performance of structures and to comply with the latest worldwide policies of environmental sustainability is leading engineers and researchers to higher interest in timber buildings. A post-tensioned timber frame specimen was tested at the structural laboratory of the University of Basilicata in Italy, in three different configurations: i) without dissipation (post-tensioning only-F configuration); ii) with dissipative angles (DF- dissipative rocking configuration) and iii) with dissipative bracing systems (BF - braced frame configuration). The shaking table tests were performed considering a set of spectra-compatible seismic inputs at different seismic intensities. This paper describes the experimental estimation of energy dissipated by multistorey post-tensioned timber prototype frame with different anti-seismic hysteretic dissipative devices used in the DF and BF testing configurations. The main experimental seismic key parameters have also been investigated in all testing configurations.

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.

An experimental study on shaking table tests on models of a concrete gravity dam

2014 ◽  
Vol 19 (1) ◽  
pp. 142-150 ◽  
Author(s):  
Bupavech Phansri ◽  
Sumetee Charoenwongmit ◽  
Ekkachai Yooprasertchai ◽  
Kyung-Ho Park ◽  
Pennung Warnitchai ◽  
...  
Keyword(s):  
Experimental Study ◽  
Shaking Table ◽  
Gravity Dam ◽  
Shaking Table Tests ◽  
Concrete Gravity Dam

Shaking table tests on the seismic performance of a flexible wall retaining EPS composite soil

2017 ◽  
Vol 15 (12) ◽  
pp. 5481-5510 ◽  
Author(s):  
Hongmei Gao ◽  
Ying Hu ◽  
Zhihua Wang ◽  
Chao Wang ◽  
Guoxing Chen
Keyword(s):  
Seismic Performance ◽  
Shaking Table ◽  
Shaking Table Tests ◽  
Flexible Wall ◽  
Eps Composite Soil

Shaking Table Tests of Static Dynamics Interchangeable-Ball Pendulum System for Motion Sensitive Equipment

2008 ◽  
Author(s):  
C. S. Tsai ◽  
Wen-Shin Chen ◽  
Ching-Pei Tsou ◽  
Chen-Tsung Yang
Keyword(s):  
Stress Concentration ◽  
Economic Loss ◽  
Shaking Table ◽  
High Tech ◽  
Sliding Surface ◽  
Shaking Table Tests ◽  
High Tech Industry ◽  
Pendulum System ◽  
Industrial Buildings ◽  
Key Industry

Recently, the high-tech industry has become a key industry for economic development in many countries. However, motion sensitive equipments located in these industrial buildings are vulnerable during earthquakes, which may cause huge economic loss. In this study, an isolator for safeguarding the motion sensitive equipment, namely, the static dynamics interchangeable–ball pendulum system (SDI-BPS) is proposed and investigated to examine its protective capability for the motion sensitive equipment during earthquakes through a series of shaking table tests. The experimental results illustrate that the SDI-BPS isolator can provide significant damping to reduce the large bearing displacement and size, and avoid the stress concentration, which can cause damage or scratches on the sliding surface of the isolator, to prolong its life span of service. The SDI-BPS isolator also provides excellent capability in protecting the motion sensitive equipment and exhibits a stable behavior under long terms of service loadings and earthquakes.

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