Component Test of Spherical Sliding Isolators

• Main Authors: Pin Hung-Kuo, 郭品宏
• Other Authors: Shue Yi-Chang
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/33336505254468415372

碩士 === 國立臺北科技大學 === 土木與防災技術研究所 === 89 === In order to have the characteristics of the coefficient of friction, velocity depending effect, time history effect and pressure effect for the spherical sliding isolator, two spherical sliding isolators were fabricated and tested at National Center for Research on Earthquake Engineering. The spherical sliding isolators are fabricated of high strength steel and they can be installed in the base of a building. The connection consists of an articulated friction slider which moves on a spherical concave surface. Two important design concepts of the spherical sliding isolator are based on the principle of a simple pendulum motion and seismic energy dissipation. The vibration period of the spherical sliding isolator can be determined from the simple pendulum equation. The internal story drift can be minimized if selecting an appropriate natural period of connections with an appropriate coefficient of friction. The natural period of the structure is controlled by the radius of the spherical concave surface of the connection, and the coefficient of friction is determined by the bearing type and the spherical concave surface roughness of the steel plate. The spherical sliding isolator can eliminate the adverse torsion response in asymmetrical structures. It is because the lateral stiffnesses of the connections are proportional to the weight of the supported structure. Hence, the center of resistance of the connections coincides with the center of mass of the structure.