Influence of Fire on the Shear Capacity of Cold-Formed Steel Framed Shear Walls
Matthew S. Hoehler, Blanca Andres Valiente
This paper presents experimental investigations of the performance of common lateral force- resisting systems used in cold-formed steel construction under sequential thermal (fire) and mechanical (earthquake) loading. Wall specimens with gypsum-sheet steel composite sheathing, Oriented Strand Board (OSB) sheathing, or steel strap bracing were tested. The results indicate that the OSB sheathed walls are more sensitive to fire-induced reduction of lateral capacity than the other investigated wall systems. Additionally, fire performance can be affected by pre-damage to the gypsum boards that provide fire protection to these walls. The results are useful for fire compartmentation design when significant lateral deformation of a building is anticipated and post-fire assessment to repair or replace a structure. The study represents a step toward developing fire fragility functions for cold-formed steel framed shear wall systems to enable performance-based fire design.
Wei-Wen Yu International Specialty Conference on Cold-Formed Steel Structures 2018