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SE12-011
14:20
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14:35
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A STUDY ON SEISMIC RETROFIT OF SUSPENDED TRANSPORTATION SYSTEMS AND AUTOMATED STORAGE SYSTEMS IN A HIGH-TECH FABRICATION PLANT
The Overhead Conveyor (OHCV) and Stocker (STK) are most frequently used transportation and storage systems in high-tech factories and should not stop operation in an earthquake. However, these two systems are vulnerable to earthquake based on the Taiwan experience. In 2016 during Meinong Earthquake, damage of these two systems led to serious impact on high-tech factories. It not only shut down the production line, caused huge economical lose, but also delayed recovery process. This study aims to increase the seismic capacity of OHCV and STK for a high-tech factory. First, a rough numerical model to realize the true response under earthquake in the clean room was developed. By using full-scale static test and shaking table test we can validate the dynamic characteristic of the numerical models. By considering the in site situation, construction feasibility, and the economic demand, retrofitted bracing systems are developed. The strength of bracing is verified by component tests. Then, the efficiency for retrofitted OHCV and STK is verified by static tests and shaking table tests. Finally, the computed response in fab showed a drastically reduced response after the proposed retrofit.
George C. Yao, Min-Chi Ko, Bing-Yi Huang, Wei-Chung Chen
high-tech fab, Non-structure Component, overhead conveyor, seismic retrofit, stocker
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SE12-029
14:35
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14:50
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SEISMIC PERFORMANCE OF SUSPENDED CEILINGS
Suspended ceilings are often found in commercial buildings as part of the building contents. They are classified as non-structural or operational and functional components in a building because they provide important services or functions to the occupants of the facilities. Non-structural components typically are not designed as part of the primary seismic force resisting system; however, these components have an impact on the safety and seismic performance of the building because of their vulnerability and their contribution to the mass, stiffness, and interaction with the main structural system during earthquakes. Traditionally, the design of non-structural components, including suspended ceilings, does not consider seismic loads and the interaction effects with the supporting structure. The damage and disruption caused by failure of non-structural components can potentially represent a significant portion of the total economic loss in an earthquake. The performance of suspended ceilings, e.g. in hospitals and schools designated as post-disaster shelters, can be critical to emergency response, resilience and recovery during and after earthquakes. This paper reviews the state of the art of suspended ceilings performance during an earthquake. The paper investigates the development of experimental research on suspended ceiling seismic performance, along with the progression of the NBCC’s seismic design forces for non-structural components. This paper also presents a current international joint collaborative research project that is being carried out by researchers in Japan, China and Canada on the seismic performance of suspended ceilings in supertall buildings. This includes both shake table testing and computer simulations program to evaluate the behavior and performance of suspended ceilings subjected to the floor input motions of tall building structures. The aim of the research is to better understand the response and failure mechanisms of suspended ceilings, to improve their performance and design, and ultimately to develop a standardized seismic design methodology for suspended ceilings in tall buildings.
Geoffrey Davidson, David Lau, Jeffrey Erochko, Kazuhiko Kasai
suspended ceiling, international research project
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SE12-023
14:50
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15:05
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Review on the seismic design method for water supply tanks installed on various levels of buildings
Water supply tanks installed on the various levels of buildings were damaged by many earthquakes. Most of damage was caused by insufficient seismic resistance. Therefore, in this study the seismic design methods for water supply tanks installed in the buildings were reviewed according to ASCE 7-16 and KBC (Korean Building Code). Particularly, lateral static force for seismic design of water tanks as nonstructural components and dynamic force considering hydrodynamic behavior of fluid under earthquake were compared with varying aspect ratios of the water tank. Then the design force was compared with the base shear force measured by the shake table test of a practical tank specimen.
Eun-Rim Baek, Hyoung-Suk Choi, Sang-Ho Lee
nonbuilding, nonstructural component, seismic design force, Shaking table test, water tank
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SE12-015
15:05
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15:20
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DESIGN OF SHAKING TABLE TEST FOR NEAR-FAULT EFFECT ON SLOSHING MODE OF WATER STORAGE TANK
During earthquakes, most damage, except for buckling, in water storage tanks is caused by liquid sloshing, especially under long-period and long-duration ground motions. This is because the sloshing frequency of the water is low and period is similar to the pulse of near-fault ground motions. For nuclear power plants, such sloshing may cause sinking and the complete collapse of the floating roofs of specific tanks. It may also cause fire in oil tanks, and cooling water loss in the spent fuel pool. Therefore, it is worth paying attention to the resonant effect of near-fault ground motions on the sloshing mode of water storage tanks.An experiment is implemented to study the resonant response of the sloshing mode. The purpose of this experiment is to estimate the sloshing height and the associated total volume of water splashing out of a tank under near-fault ground motions, and also to determine the relationship between the resonant response and the input velocity pulse. This paper describes the test plan in detail, consisting of (1) the design of the scaled storage tank and water depth and (2) the selection and processing of input motions including the original near-fault ground motions, extracted velocity pulse, and extracted bandpass signals for resonance analysis, as well as the impulse motion for free vibration.
Wei-Hung Hsu, Juin-Fu Chai, Fan-Ru Lin, Tzu-Chieh Chien, Zhi-Yu Lai, Zhen-Yu Lin
Fluid-solid interaction, Near-fault ground motion, Shaking test, Storage tank
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SE12-020
15:20
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15:35
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NUMERICAL ANALYSIS ON SEISMIC SHELTER AND EARTHQUAKE-PROOF FURNITURE
After the occurrence of Chi-Chi Earthquake on 21 September 1999, Taiwan Government have been working on the seismic evaluation and retrofitting of public buildings which are considered as old buildings with insufficient seismic capacity. Ministry of Education of Taiwan promoted a program on seismic retrofitting for public schools which was executed by National Center of Research on Earthquake Engineering. It is considered a success as 90% of these public-school buildings have been relieved. However, recent earthquakes such as Meinong earthquake has shifted the retrofitting attention from public buildings to private buildings as many of them are not providing enough seismic performance. Taking financial difficulty from private building ownership into account, Construction and Planning Agency of the Ministry of Interior is then promoting Phased Retrofit Program in order to reduce retrofits’ financial threshold substantially. Therefore, the remaining problem is due to complex ownership of private building, majority disallowance on retrofitting will lead to obstruct. In order to fulfil expectation on seismic safety for people, the solution without whole building retrofitting or phased retrofitting is miniaturization retrofitting. In miniaturization retrofitting proposed in this project, newly developed structural material and methods are used to develop earthquake-proof furniture which function as seismic safety shelter during the earthquake. This study proposed a method to estimate the axial load required by seismic-proof furniture. A design prototype of seismic-proof table is also introduced in this study. This study is expected to be able to help people in understanding miniaturization retrofitting design thus reducing casualties during catastrophic earthquakes.
Sukrisna Gautama, Fu-Pei Hsiao, Damien Yon Chin Tan
Earthquake-proof Furniture, miniaturization Retroffiting, Seismic Assessment and Retrofitting, Seismic Shelter
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SE12-019
15:35
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15:50
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Experimental Study on Seismic Shelter and Earthquake-proof Furniture
After the occurrence of Chi-Chi Earthquake on September 21st 1999, Taiwan Government have been working on the seismic evaluation and retrofitting of public buildings which are considered as old buildings with insufficient seismic capacity. On those cases, there is this program which is promoted by the Ministry of Education, and is executed by National Center for Research on Earthquake Engineering (NCREE) on seismic retrofitting for public schools. It is considered a success as 90% of these public school buildings have been relieved. Now a day, just less than 10% remains. However, recent earthquakes such as 0206 Meinung Earthquake and Hualien Earthquake have shifted our retrofitting attention from public buildings to private buildings as many of them are not providing enough seismic performance. Taking financial difficulty from private buildings owner into account, Construction and Planning Agency of the Ministry of Interior is even promoting Phased Retrofit Program in order to reduce retrofits’ financial threshold substantially. So, the remaining problem is due to complex ownership of private building, majority disallowance on retrofitting will lead to obstruct. In order to fulfil expectation on seismic safety for people, the only option left without whole building retrofitting or phased retrofitting is miniaturization retrofitting. In miniaturization retrofitting proposed in this project, newly developed structural material like high strength fiber concrete, high strength seismic steel, etc. are used to develop seismic shelter and earthquake-proof furniture which can be acted as a safety shelter during earthquakes. These seismic shelter and earthquake-proof furniture will be tested in a new experimental environment of collapse simulation to ensure its safety, so that it provides safe shelter during disaster occurrence. Furthermore, it can be combined with Earthquake Early Warning system (EEWS) so that resident can enter seismic shelter or earthquake-proof furniture in time. The application of this program is believed to be able to reduce casualties during catastrophic earthquakes drastically.
Sukrisna Gautama, Fu-Pei Hsiao, Damien Yon Chin Tan, Pei-Yang Lin, Chieh-Chi Yeh
Earthquake-proof Furniture, Experimental Environment of Collapse Simulation, Miniaturization Retrofitting, Seismic Assessment and Retrofitting, Seismic Shelter
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