FEMA P-58 Assessment of a 10-story Shake Table Tested Cold-formed Steel Building

A 10-story cold-formed steel (CFS) building, referred to as CFS10, was tested at the NHERI 6-DOF Large High Performance Outdoor Shake Table (LHPOST6) under multi-directional earthquake input motions scaled to different hazard levels. The test building was outfitted with a wide range of nonstructural components and systems such as fire sprinkler and gas piping systems, suspended ceilings, a resilient stair system, windows, doors, roof-mounted mechanical equipments, and architectural wall and ceiling finishes. This paper presents updates to consequence functions for steel sheet sheathed CFS shear walls for improved fragility functions introduced in recent literature. Using these updated consequence functions, a seismic risk assessment of CFS10 building is performed based on the FEMA P-58 methodology. The assessment utilized SP3 RiskModel platform to integrate measured structural response with building-specific component data to determine probabilistic estimates of expected damage, economic loss and post-earthquake reoccupancy and functional recovery time. These estimates are collated with damage observations and functionality checks for structural and nonstructural components at different damage states from the seismic tests. Comparison of estimated damage state exceedance probabilities with test observations highlights specific components for which fragility information may warrant targeted refinement to improve assessment results.

Proceedings of the 12th International Conference on the Behaviour of Steel Structures in Seismic Areas (STESSA), New Delhi, India.