Analysis, Design & Performance
339585 - Mapping engineering demand parameters in high-friction sliding isolated houses to determine target implementation locations in California
Friday, April 20
3:30 PM - 5:00 PM
Light frame houses are susceptible to costly damage to structural and nonstructural components, as well as contents damage, during even moderate intensity earthquakes. The authors have recently validated high-friction sliding seismic isolation as a low-cost method to nearly eliminate damage during intense MCE shaking through full-scale shake table tests of a two-story house. This paper compares deformations and accelerations in houses that are isolated with high-friction sliding systems and conventional low-friction sliding systems to fixed-base houses at numerous intensities around California. Statewide and major metropolitan area maps of deformation and acceleration ratios of isolated versus fixed-based houses highlight the near-fault locales where there is a substantial decrease in damage when one implements an isolation system. Results show that isolated houses have significantly reduced engineering demand parameters compared to fixed-base structures, however, conventional low-friction sliding systems do not substantially improve performance compared to high-friction sliding systems in regions where it is most beneficial to isolate a house. The high-friction systems substantially reduce isolation deformation demands compared to the low-friction systems. Results from this study provide practitioners with an easy way to determine if there is a substantial benefit to isolating a particular house or sub-development of houses, to quantify the decrease in structure deformations and accelerations, and to select a preliminary sliding isolation concept and properties based on the location and desired performance of the structure.