Thermo-mechanical behaviour of dovetail timber joints under fire exposure

Publication date: Available online 26 November 2017

Source: Fire Safety Journal

Author(s): Jin Zhang, Yuexiang Wang, Linfeng Li, Qingfeng Xu

Abstract

This paper presents a 3D finite element model to analyse the thermo-mechanical behaviour of dovetail timber joints under standard fire exposure. The mechanical model of timber is based on Yamada-Sun failure criterion and continuum damage mechanics (CDM) theory. The thermal model considers the classical heat transfer and temperature-dependent properties of material to predict the charring rates and evolution of temperature fields. The thermo-mechanical model is validated by comparing the fire resistance and displacement-time curves with experimental results. Novel numerical failure criterion based on the kinetic energy-time curves were proposed. The numerical models show a good capacity to simulate the thermo-mechanical behaviour of dovetail timber joints under fire exposure.

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