Effect of fire-induced damage on the uniaxial strength characteristics of solid timber: A numerical study

摘要: The advent of the structural Eurocodes has allowed civil engineers to be more creative in design structures exposed fire. Rather than rely upon regulatory guidance and prescriptive methods are now able use such codes buildings on basis credible fires rather accepted unrealistic standard-fire time-temperature curves. Through this process safer efficient designs achievable. key development enabling performance-based fire is emergence validated numerical models capable predicting mechanical response a whole building or sub-assemblies at elevated temperature. In way, efficiency savings have been achieved steel, concrete composite structures. However, present, due combination limited fundamental research restrictions UK National Annex timber Eurocode, fire-exposed using modelling techniques not generally undertaken. 'fire design' covered Eurocode 5 part 1.2 (EN 1995-1-2). code there an advanced calculation annex (Annex B) intended facilitate implementation properties contained can, only applied exposure conditions. This existing limitations related available thermal which valid for standard exposure. attempt overcome barrier authors proposed 'modified conductivity model' (MCM) determining temperature elements during heating phase non-standard fires. briefly outlined paper. addition, further study, MCM implemented coupled thermo-mechanical analysis uniaxially loaded finite element package DIANA was adopted with plane-strain assuming two-dimensional heat flow. resulting predictions failure time given levels load discussed compared simplified 'effective cross section' method presented EN 1995-1-2.