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Authors
Advisor(s)
Abstract(s)
Light Timer Frame Walls are made of solid timber elements and are usually fire protected by other
materials. This investigation determines the residual load bearing capacity of Light Timber Frame Walls for fire
rating periods of 30, 60, 90 and 120 min. The timber frame is made with 3 studs and 2 tracks, using two different
fire protection levels (one and two gypsum layers). The computational model includes the thermal analysis under
standard fire, including all types of materials and a sequential mechanical analysis with incremental load applied
for each fire rating periods, applied just for the load bearing material. Nonlinear solution methods are used with
small tolerance values for solution convergence, to determine the correct temperature and displacement fields. The
thermal and the mechanical properties are considered temperature dependent. The mechanical analysis considers
large displacement behaviour, and the charring effect of wood is included by the reduction of the stiffness and
strength of the timber. The results show that the load bearing capacity decreases with the fire exposure time. A new
proposal is presented between the load bearing capacity and the fire rating and finally the char layer is compared
with the current and future version of Eurocode 5, part 1.2.
Description
Keywords
Fire LTFW walls Load bearing Charring rate Finite element method
Pedagogical Context
Citation
Piloto, P.A.G.; Fonseca, E.M.M. (2022). Load bearing capacity of light timber frame walls under fire. Mathematics in Computer Science. ISSN 1661-8289. 16:1, p. 1-16
Publisher
Springer