An experimental and analytical investigation was conducted to determine the seismicperformance of timber structures with the application of spray-applied infill polyurethane foam(SPF). Full-scale timber shear walls were constructed and tested using the CUREE-Caltechpseudo-static loading protocol (Krawinkler et al, 2003) and results were used to calibrate acomputer based simulation model. Nonlinear time-history analyses of one- and two-storystructures over a range of building weights were conducted with ground motion suites of varyinghazard levels. It was shown with experimental testing that there is as much as a 30% increase inpeak post-yield strength with application of SPF. Computer based simulations suggest that withthe application of SPF to standard timber shear walls there is both a reduction in drift demand(up to 40%) as well as ductility demand. However, this benefit is indirectly dependent onnumber of stories (one or two), building weights, building periods, and ground motion severity.
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