Shaking table tests of typical B-ultrasound model hospital room in a simulation of the Lushan earthquake

Earthquakes have again highlighted the vulnerability of China’s health facilities. The current investigation of the seismic status of hospital facilities was conducted after the Lushan MW6.6 earthquake, and both structural and nonstructural damage are listed. Structural and nonstructural damage of four typical hospitals and clinics are discussed here. Structural damage is here described alongside damage to architectural elements, equipment, and furnishings caused by earthquakes. This investigation indicated that the hospital facilities can lose partial or full functionality due to nonstructural damage or even limited structural damage. Although none of the objects inside were knocked over and only a few decorations fell down, many sets of equipment were severely damaged because of the strong floor vibration. This resulted in great economic losses and delays in rescue operations after the earthquake. Shaking table tests on a full scale model of a B-ultrasound room were conducted to investigate the seismic performance of a typical room in a hospital. The tests results showed that the acceleration responses of the building contents with or without trundles demonstrated different behaviour. Without trundles, the peak acceleration and the peak displacement of building contents first increased with increasing PGA and then decreased when the acceleration exceeded a particular value. Then they both changed a little. Because of the rapid turning trundles, the response of building contents increased only slightly as PGA increased, or even decreased or remained roughly steady.

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Shaking Table Tests on Chinese Ancient Tenon-Mortise Structure Strengthened by Steel Components

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.204-208.3251 ◽

2012 ◽

Vol 204-208 ◽

pp. 3251-3255

Author(s):

Qian Zhou ◽

Wei Ming Yan

Keyword(s):

White Noise ◽

Shaking Table ◽

Peak Acceleration ◽

Shaking Table Tests ◽

Earthquake Intensity ◽

Peak Displacement ◽

Wooden Frame ◽

Basic Frequency ◽

White Noise Excitation ◽

Prototype Structure

In order to protect Chinese ancient building, steel components were considered to strengthen its tenon-mortise joints and the strengthening effects were studied by shaking table tests.Based on actual sizes of an ancient building,a wooden frame model with a scale of 1:8 of the prototype structure was built considering Yan-wei type of tenon-mortise connections.Steel components were used to strengthen tenon-mortise joints of the model to enhance its stability.By white noise excitation values of basic frequency for model in both strengthened and unstrengthened conditions were obtained;By inputing El-Centro earthquake waves of different peak acceleration values,responses of displacement and acceleration for typical nodes of the model were obtained.Results show that after its tenon-mortise joints are strengthened by steel components, basic frequency of the model increases;Under earthquake the strengthened model responds with smaller peak displacement and acceleration values;With the increase of earthquake intensity,the steel components tend to perform better.Thus the steel components are effective for strengthening tenon-mortise joints of Chinese ancient buildings.

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Earthquake induced floor accelerations on a high-rise building: Scale model tests on a shaking table

IABSE Congress, Christchurch 2021: Resilient technologies for sustainable infrastructure ◽

10.2749/christchurch.2021.1312 ◽

2021 ◽

Author(s):

Fabio Rizzo ◽

Alessandro Pagliaroli ◽

Giuseppe Maddaloni ◽

Antonio Occhiuzzi ◽

Andrea Prota

Keyword(s):

Soil Structure ◽

Shaking Table ◽

Soil Structure Interaction ◽

Scale Model ◽

Structural Elements ◽

Shaking Table Tests ◽

Building Model ◽

High Rise ◽

High Rise Building ◽

Story Building

<p>The paper discusses results of shaking table tests on an in-scale high-rise building model. The purpose was to calibrate a dynamic numerical model for multi-hazard analyses to investigate the effects of floor acceleration. Accelerations, because of vibration of non-structural elements, affect both the comfort and safety of people. The research investigates the acceleration effects of both seismic and wind forces on an aeroelastic in-scale model of a multi-story building. The paper discusses the first phase of experiments and gives results of floor accelerations induced by several different base seismic impulses. Structural analyses were first performed on the full-scale prototype to take soil-structure interaction into account. Subsequently the scale model was designed through aeroelastic scale laws. Shaking table experiments were then carried out under different base accelerations. The response of the model and, in particular, amplification of effects from base to top are discussed.</p>

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Rc Infilled Frame: Shaking Table Tests on a Full Scale Model

Damage Assessment of Structures VII - Key Engineering Materials ◽

10.4028/0-87849-444-8.285 ◽

2007 ◽

pp. 285-290

Author(s):

Elena Candigliota ◽

Alain Le Maoult

Keyword(s):

Full Scale ◽

Shaking Table ◽

Scale Model ◽

Shaking Table Tests ◽

Infilled Frame

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Shaking Table Tests of Critical Equipment With Simple Isolators

Volume 8: Seismic Engineering ◽

10.1115/pvp2006-icpvt-11-93250 ◽

2006 ◽

Author(s):

C. S. Tsai ◽

Wen-Shin Chen ◽

Shih-Hsien Yu ◽

Chen-Tsung Yang

Keyword(s):

Shaking Table ◽

Original Position ◽

Economic Losses ◽

High Tech ◽

Shaking Table Tests ◽

Restoring Force ◽

Ground Acceleration ◽

Maximum Displacement ◽

Natural Period ◽

Energy Absorbing

Because the earthquake is one kind of non-predictable calamity and happens suddenly, its disaster and consequence are larger than other calamities. Mankind must face not only the emotional effects caused by earthquakes, but also the damage to the structure and substructure systems. The fire, damaged pipeline systems cased by earthquake and the destruction of the semiconductor, equipment or microelectronics in high-tech factories will cause an enormous and a chain of economic losses. Therefore, there is a need of an economical and efficient method to protect equipments from earthquake damage. Namely, in addition to promoting the earthquake-resistant capacity of structures, it is also important to ensure the safety of the expensive equipment and facilities. In this study, it is aimed at developing a new simple isolator with appropriate damping for critical equipment. The basic principle of the simple isolator is to lengthen the natural period of equipment, and simultaneously to reduce the earthquake-induced energy and the displacement of the isolator by additional damping. A series of shaking table tests for critical equipment isolated with simple isolators were carried out in the Department of Civil Engineering, Feng Chia University, Taichung, Taiwan. From these test results, it is illustrated that the simple isolator can reduce more than 80% responses of accelerations under earthquakes with peak ground acceleration of above 0.450g. Therefore, the simple isolator can be recognized as a feasible and promising way in mitigating the seismic responses of equipment. In addition, the simple isolator possesses enough energy absorbing capacity to reduce its maximum displacement and the restoring force to bring the isolator back to the original position without significant residual displacement.

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Shaking Table Tests of a Typical Mexican Colonial Temple: Evaluation of Two Retrofitting Techniques

Earthquake Spectra ◽

10.1193/030512eqs064m ◽

2013 ◽

Vol 29 (4) ◽

pp. 1209-1231 ◽

Cited By ~ 1

Author(s):

Marcos Chávez ◽

Roberto Meli

Keyword(s):

Energy Dissipation ◽

Research Program ◽

Maximum Intensity ◽

Shaking Table ◽

Scale Model ◽

Stone Masonry ◽

Significant Source ◽

Second Phase ◽

Shaking Table Tests ◽

Displacement Capacity

This paper reports the results of the second phase of a research program that carried out shaking table tests on a scale model of a typical stone masonry temple. This second phase evaluates the efficacy of two different retrofitting techniques by comparing the response of the retrofitted models with that of the original unreinforced model. It was found that both retrofitting schemes substantially enhanced the performance of the model temple. The maximum intensity of the base motion for which damage was considered to be still repairable increased by 80% and 120% for the first and the second levels of retrofitting, respectively. In terms of displacement capacity, the response of the model with the second level of retrofit reached a maximum drift of 0.4%. The initial damping ratios were found to be in the range of 7% to 9%, both in the original and the retrofitted models. These ratios constitute a significant source of energy dissipation for this kind of structure.

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Acceleration Thresholds of Vertical Floor Vibrations According to Human Perception Levels in Korea

Advances in Structural Engineering ◽

10.1260/136943309789508537 ◽

2009 ◽

Vol 12 (4) ◽

pp. 595-607 ◽

Cited By ~ 6

Author(s):

Sang Whan Han ◽

Min-Jung Lee ◽

Ki-Hoon Moon

Keyword(s):

Residential Buildings ◽

Human Perception ◽

Shaking Table ◽

Shaking Table Tests ◽

Floor Vibrations ◽

Floor Vibration ◽

Vertical Vibrations

Vertical floor vibrations in residential buildings are typically induced by the movements of jumping and walking of occupants, which often annoy other occupants. To help control such floor vibrations, several criteria have been developed mostly based on human perception tests. The objective of this study is to propose acceleration thresholds of appropriate vertical floor vibration due to heel impacts and walking activities. Four different perception levels are considered appropriate criteria for Korean residential buildings; imperceptible, slightly perceptible, distinctly perceptible, and strongly perceptible. Shaking table tests were conducted simulating heel impact induced- and walking induced-vertical vibrations for various combinations of frequencies, damping ratios and acceleration amplitudes. Twenty Korean test subjects were used. It is observed that test subjects are more sensitive to walking-induced vibrations than those induced by heel impacts having the same peak accelerations. This study also shows that the acceleration thresholds proposed as a result of this study using Korean testing subjects are lower than those proposed by other researchers in different countries.

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Experimental Study on Seismic Failure of High Arch Dam with Scale Model Test on Shaking Table

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.353-356.2004 ◽

2013 ◽

Vol 353-356 ◽

pp. 2004-2007

Author(s):

Peng Fei Gao ◽

Xin Feng ◽

Jing Zhou

Keyword(s):

Shaking Table Test ◽

Failure Process ◽

Arch Dam ◽

Shaking Table ◽

Scale Model ◽

Experimental Investigations ◽

Shaking Table Tests ◽

High Arch Dam ◽

Structural Concrete ◽

Concrete Material

This paper presents the experimental investigations into the seismic failure for high arch dam with shaking table test. The similitude scale of high arch dam was studied firstly. Then we developed a like concrete material to simulate the mechanical behavior of the structural concrete in high arch dam. The shaking table tests have been performed on the scale model. The experimental results reveal the failure process of high arch dam with respect to the different earthquake intensities.

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