Study On Seismic Performance Of A New-Type Bearing In Large-span Spacial Structure

Large-span latticed shell structure, as its beautiful appearance, reasonable mechanical performance, flexible and diversity of structures, high-degree mechanism and factory, has been the spatial structure which has developed faster in recent years. It has been applied widely in stadiums, exhibition centers, swimming pools, restaurants, industrial buildings and so on.As the span of latticed shell structures become larger and larger, it causes the roof weight to increase. The most important problem in the course of structure design is that the large-span latticed shell structure will make immense horizontal thrust so that the sub-structure can't resist it. Meanwhile most areas in our country are in earthquake regions, and we need consider the influence of earthquake. So the problem "how to reduce the effect of earthquake on the large-span latticed shell structures" is more important. In recent years, as researching the reduction vibration control technology of tall building structures more deeply, people have applied this technology to the large-span latticed shell structures. Usually laminated rubber bearings can solve the above problems. Therefore to conduct a deep study on horizontal stiffness and hysteretic performance of rubber bearings has a very important theoretical significance and practical value.This article has mainly carried on the following work:1. Through changing bolts'diameters and numbers, rubber pad's thicknesses and flat sizes, load directions when bolts are distributed asymmetrically, this paper analyzed the horizontal stiffness of laminated rubber bearings which were frequently used in practical projects.2. Through the use of ANSYS finite element analysis (FEA) of large-scale general-purpose software, the paper analyzed the hysteretic performance of laminated rubber bearings with bolts, and compared it with the one of normal laminated rubber bearings and lead laminated rubber bearings.3. Finally, this paper acquired the skeleton curves from their hysteretic curves, and conducted simple analysis.Results indicate that bolts can effectively improve the horizontal stiffness and hysteretic performance of laminated rubber bearings, and make its hysteresis curve fuller, show better hysteretic performance and energy consumption. At the same time the influence of different load directions on horizontal stiffness of laminated rubber bearings when bolts are distributed asymmetrically summarizes layout principles of bolts, which offers valuable basis for designing laminated rubber bearings. The study content and results of this article have theory and practical significance on the application and population of the laminated rubber bearings in the practical projects.