| Recently, isolation studies on the horizontal earthquake components of earthquakemotion have become mature, and entered an actual application stage. But beacause of the multi-dimensional properties of the earthquakemotion, as for some important buildings and infrastructures in high-intensity and the epicenter nearby areas, it is very necessary and important to consider three-dimensional base isolation with the vertical seismic component. The existed research shows that the structure reaction under three-dimensional vibration is much more intense than that of one-dimensional earthquake. For high-rise structure, the vertical components of earthquakemotion tend to exacerbate the damage of structure. Many scholars of other countries like America,Japan and France, are conducting the research, trying to solve this problem. Domestic scholars have also done a lot research on the relevant theoretical and practical study , and proposed several three-dimensional base isolation devices in the resent years. The theory study on vertical isolation and device development will push the vertical earthquake research in turn and furtherly promote vertical isolation in practical application, and broaden the application scope of base isolation.The resistive overturning problems of isolation structure, especially the three-dimensional base isolation structure has always been a blind spot of domestic and overseas engineering of academic study. The current structure isolation forms, either two-dimensional base isolation or three-dimensional base isolation do not consider the overthrow of the structure. Especially when isolation structure toward to senior development, the resistive overturning problem of structure gradually show its importance. Theoretically study how to transform the existing isolation bearing to possess resistive overturning ability, develope a new kind of isolation bearing with resistive overturning ability, and use experiment method to verify it. This study enriched the methods and contents of architectural isolation. It is of important significance for improving the safety and comfort of the seismic-isolation structure, and having Great stimulative effects on further promote isolation.The major studies are as follows:1. On the basis reading of literatures, fully understand the basic principle of base-isolation system and the main type and performance of the isolation device,grasp the situation about three-dimensional base isolation and resistive overturning research on high-rise structure, and put forward the main research contents of this paper;2. Using finite element analysis software to simulate shaking table test model installed on a 3D isolation resistive overturning device;3. According to the principle of three-dimensional base isolation technology, considering 3D characteristics of the earthquakemotion, studying the various 3D isolation form, comparing advantages and disadvantages of different isolation form, transform the existing isolation bearings to possess resistive overturning ability, developeing a new kind of isolation bearing with resistive overturning ability;4. Building simplified mechanical model of the new three-dimensional base isolation and resistive overturning device, using a simplified analysis method to simulate the example and verify it;5. Expounding the main achievements obtained in this paper and prospecting the research on this subject. |
