Enhancing Seismic Performance through Protective Structural Systems

Seminar | February 27 | 11 a.m.-12 p.m. | 542 Davis Hall

 Tracy Becker

 Civil and Environmental Engineering (CEE)

While major advances have been made in seismic design, there still exists a large disconnect between the performance level that buildings are designed to achieve and the performance level required for community resiliency. Although current building codes limit fatalities in new construction, they do little to limit socioeconomic losses. For example, in 2016, earthquakes resulted in losses of $43 billion, one quarter of the total losses from all natural and man-made disasters. Protective technologies such as dampers, structural fuses, and seismic isolation deliver significantly increased performance both to the structure and the community as a whole. However, there are still hurdles for their widespread adoption, and researchers must work to make these systems higher performing, more affordable, and more reliable.

To increase the reliability of high-performance systems, we need a more complete understanding of their performance in beyond-design events. For isolation, excessive displacements in large earthquakes are a potential issue for safety. This talk will present an experimental study of friction pendulum bearings under extreme earthquake levels, in which impact, yielding, uplift, and failure of the bearings were observed. This information is used to investigate the probability of collapse in code-compliant isolated buildings, exposing a strong link in collapse margin with the selection of the superstructure lateral load resisting system. Additional research on other high performance systems such as localized heat treatment of structural steel components will be touched upon.

 leorig@berkeley.edu, 510-642-1762