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HCAI webinar highlights analysis choices: linear vs. nonlinear, SSI and time histories for SPC projects
Summary
HCAI staff reviewed analytical approaches for SPC upgrades, advising engineers to respect linear-analysis limitations, consider nonlinear time-history or pushover checks, and model soil‑structure interaction where required.
The Department of Health Care Access and Information’s Seismic Compliance Unit advised engineers on analysis approaches for SPC retrofit projects, emphasizing correct method selection, checks and common pitfalls.
Seismic Compliance Unit staff said ASCE/SEI 41‑13 remains the governing standard for SPC 4D evaluation. For many projects designers use linear analysis, but HCAI cautioned that linear approaches have limitations for buildings with certain irregularities and should not be used where code or geometry…
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