| The centrifugal shaker is internationally acknowledged as the most advanced and the most effective testing equipment in the field of seismic resistance of geotechnical engineering. It has been applied to research fields of geotechnical dynamics by many developed countries. However, China hasn't constructed a large-scale centrifugal shaker until now, which is remarkably not adaptable to the wide territory, complicated engineering geotechnical conditions, rapid economy growth and serious seismic risks in China. Consequently, the Institute of Engineering Mechanics(IEM), China Earthquake Administration plans to construct a large-scale centrifugal shaker,which will hold a leading position in China and can be comparable with the advanced ones in the world as well.The dynamical centrifugal model test is highly-sophisticated testing technology, As difficult points also exist in centrifuges, shakers, and testing auxiliary systems. the manufactural technology of shakers is still under development, and the vertical-horizontal biaxial shaker is a challenging problem in the world. At present, about 20 centrifugal shakers with horizontal uniaxial shakers have been successfully constructed in the world, but only six of them hold the shaking capacity above 10g-t. Furthermore, currently, only UC Davis centrifugal shaker of NEES owns a vertical-horizontal biaxial shaker in the United States which can work well in the world, Some problems of the vertical-horizontal biaxial shaker still exist, though the outlay of its development is quite large.Purposes of the thesis are to provide guidance and assistance for construction of centrifugal shaker at IEM and in China. The main works of the thesis are as follows:1.It is systematically introduced and summarized that the historical development and applications of geotechnical centrifuge and centrifugal shakers. The basic structure and testing principles of centrifugal shaker are also explained. In addition, the thesis summarizes the main characteristics and basic principles in mechanical layout of centrifugal shakers. Also, it is summarized that the current applications and achievements of dynamical centrifugal model tests.2.The thesis explains the necessity of constructing a large-scale centrifugal shaker in China, and summarizes the development trend of centrifugal shakers in the world. Based on these, it is proposed that the design ideas and index demands of centrifugal shakers in China. In addition, the key problems and technical difficulties of obtaining the technical indices are indicated.3 . Through contrasting structures of centrifuges of some representative centrifugal shakers in the world, the detailed technical indices and structural layout of the centrifugal shaker at IEM are provided. Analyzing the difficulties of each critical component of the centrifuge at IEM, it is given that the basic principles and advices of the design of each critical component. Meanwhile, the thesis gives advices to the computational method of running power of centrifuges, the measures of cooling in the machine hall and the design of centrifuge monitored control system.4.The thesis summarizes characteristics and technical points of shakers in centrifugal shakers. By contrasting and analyzing the performance indices and structures of existing facilities in the world, defects are indicated. Based on works above, the thesis further advances preliminary ideas of the structure and difficulties of the shaker at IEM. In addition, it is also analyzed that the components and points of control system, the hydraulic power system and the safety monitoring system of the shaker.5.Through contrasting the development of testing auxiliary system at home and abroad, the basic designs of testing auxiliary system at IEM are accomplished according to the functional requirements of our facilities, including test data acquisition and video cameras system design requirements and points , model containers design ideas , modeling facilities components and modeling basic principles etc. |
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