An automated warehouse is a system which automatically controls the storing and shipping of a large number of cargoes in small floor spaces. In the 2011 Tohoku earthquake, many automated warehouses shut down because of the fall of stacked cargoes, and the recovery needs a long time. The importance of the seismic countermeasure preventing the fall of cargoes is noticed from the business continuity planning. The authors developed two countermeasures; one is the vibration control system and the other is the base isolation system. For developing these countermeasures, it is important to clarify the falling behaviors of cargoes. Shaking table tests were conducted for evaluating them. This paper describes the experimental results focusing on the dynamic characteristics of cargoes. An automated warehouse is a system which automatically controls the storing and shipping of a large number of cargoes in small floor spaces. In the 2011 Tohoku earthquake, many automated warehouses shut down because of the fall of stacked cargoes, and the recovery needs a long time. The importance of the seismic countermeasure preventing the fall of cargoes is noticed from the business continuity planning. The authors developed two countermeasures; one is the vibration control system and the other is the base isolation system. For developing these countermeasures, it is important to clarify the falling behaviors of cargoes. Shaking table tests were conducted for evaluating them. This paper describes the experimental results focusing on the dynamic characteristics of cargoes.
Keywords :
The friction characteristic § of fUH− scale elasIic sliding bearings were investigated from 山e results of dynamic tests perft 〕 rmed under sinusoidal and selsmic response loading、 The dependence of frictien coefficient on velgcity , pressure and load repetition was clarified by sinusoidaUoading tests. Based on the multlple regression analysis of test data, an expressjon fbr evaluating friction coefflcients of elastic sliding beadngs is suggested . From this , the time history of friction f {)rce that was observ ¢ d in the seismic response loading tests was estimated . 11ne sirnulated relationships between sliding displacement and shear fbrce showed go 〔 岨 agreement with the test results . Keywords : eiastic s ' iding bearing. jii 〃 sca ' e medei , base isela 'ion , dep 劭 ぬ 〃 o ¢ 声 c ' ion coefficient 弾 性す べ り支承 ,実大試験体,免震.依存性,摩擦係数
A vibration control system for an automated warehouse was developed that can be applied to existing warehouses as well as newly built ones. The device used for this system is the "postinstalled mass damper" that can be post installed on the cargo storage space in an automated warehouse. This damper has a large mass that causes a sustainable effect of reducing the response across a wide range of natural frequencies of an automated warehouse, which vary depending on the number of stacked cargoes and their weight. The results of the shaking table test demonstrated that the fall of cargoes by the earthquake ground motion could be prevented by using this damper because the accelerations of the rack were reduced to 50%-70%. Moreover, this effect was confirmed by the analysis conducted with the proposed model. The acceleration of the rack top was reduced to 80% and the maximum slip displacement of the cargoes was reduced to 25%.
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