Fire Performance of Self-Tapping Screws in Tall Mass-Timber Buildings

Building elements are required to provide sufficient fire resistance based on requirements set forth in the National Code of Canada (NBCC). Annex B Canadian standard for wood engineering design (CSA O86-19) provides a methodology calculate structural fire-resistance large cross-section timber elements. However, it lacks at providing provisions connections. The objectives this study understand performance modern mass fasteners such as self-tapping screws, namely evaluate their thermo-mechanical behavior and predict exposure up two hours, would be tall buildings Canada. results present great using screws under long time connections construction. smaller heated area exposed surface has limited thermal conduction along fastener’s shanks maintained temperature profiles relatively low hours exposure. Based heat-affected area, presents new principles determine residual length penetration that adequate load-capacity fastener conditions. It also allows determining safe values unprotected construction