Seismic Isolation of Sensitive Equipment: Semm Seminar

Seminar: Structural Engineering, Mechanics and Materials: Civil and Environmental Engineering | November 6 | 12-1 p.m. | 502 Davis Hall

 Amarnath Kasalanati, Associate Director, Pacific Earthquake Engineering Research Center

 Civil and Environmental Engineering (CEE)

Seismic isolation has been used effectively over the past three decades to protect contents of structures and maintain the functionality of buildings. In recent years, there has been a growing interest in isolating only specific floors within buildings or select equipment. Isolating equipment rather than entire buildings poses unique challenges due to the relatively light mass supported by the isolators and the consequent need for isolator stiffness that is two to three orders of magnitude lower than conventional isolation. Moreover, space constraints inside the buildings and around the equipment require innovative solutions to accommodate the required isolation hardware. This presentation discusses seismic isolation of equipment using a multi-directional spring. This spring provides damping and self-centering capability while occupying much smaller space than conventional method of using orthogonal springs and dampers. This system was extensively tested on shake tables at the University of California, Berkeley (PEER Labs), University of Nevada, Reno and SUNY University at Buffalo.