Fie-Safety nalysis Timbe FRILO Softwae GmbH www.filo.com info@filo.com s of 29/06/2016
Fie-Safety nalysis Timbe Fie-Safety nalysis Timbe This documentation efes to the fie safety veifications used in the D10, HO1, HO4 and HO11 softwae applications fo oof and timbe stuctues. Contents Fundamentals of the fie-safety analysis as pe DIN 4102-22, EN 1995-1-2 4 FRILO Softwae GmbH Pae 3
Fie-Safety nalysis Timbe Fundamentals of the fie-safety analysis as pe DIN 4102-22, EN 1995-1-2 (Fo DIN 1052:2004, EN 1995:2008) The followin constant chain ates ae ecommended fo: Softwood (ho >= 290 k/m³) v = 0.8 [mm/min] Laminated timbe (Rho >= 290 k/m³) v = 0.7 [mm/min] Hadwood (ho >= 450 k/m³) v = 0.7 [mm/min] Hadwood (ho >= 450 k/m³) v = 0.5 [mm/min] (EN5 v = 0.55 [mm/min]) It should be noted in this context that the chain ates depend on the moistue content, the density, the shape of the coss section and the natue of the wood. The chain ates fo timbe-deived mateials should be detemined accodin to the specifications in the appoval o in the standad (EN5 4.4.2). The chain ates povide fo the assessment of the fie load applyin to one side: Examples fo the epesentation of the fie load: (b = width and h = heiht of the coss section) On one side: == e.. 0 b, 1 h unde fie On two sides: == e.. 1 b, 1 h unde fie On thee sides: == e.. 2 b, 1 h unde fie On fou sides: == e.. 2 b, 2 h unde fie The followin elations apply to solidity/iidity: f = k k (c,t,m)d mod,fi fi E = k k mod,d,fi mod,fi fi f (c,t,m) k E M,fi 0,05 M,f i G = k k mod,d,f i mod,f i fi fak G M,fi 05 fak = 2/3 fo solid timbe; fak = 1 fo luelam 1U k mod,f i(m) = 1-225 1U k mod,fi(c) = 1-125 1U k mod,f i(t,emod) = 1-333 1U (EN5 k mod,f i(m) = 1-220 fo pessue ) fo bendin 1U (EN5: k mod,f i(t,emod) = 1-300 ) fo tension, iidity M,fi = 1.25 fo solid timbe, softwood, hadwood = 1.15 fo laminated timbe, deived timbe boads = 1.10 laminated venee timbe (Keto) = suface aea [m²] and U = cicumfeence [m] of the esidual coss section = 1.00 patial safety coefficient fo mateial The calculation method descibed above is not pemitted by ÖNORM B 1995-1-2:2008. The ustian standad equies the less favouable calculation method with a educed coss section. Pae 4 Softwae fo stuctual calculation and desin
Fie-Safety nalysis Timbe Veification fo nomal foce and moment load The veifications fo bendin, bendin tension and compession with bendin as well as the stability veifications ae pefomed in accodance with the specifications of DIN 1052:2004/2008 and/o EN 1995. The esidual coss section and the eduction of the stenth and stiffness popeties ae taken into account in these veifications. The stuctual system the analyses ae based on must not chane duin the action of the flames. If axial foce is decisive fo the fie safety, the followin esults ae displayed: t F F30 B, R30 Chain min b/h Chain time in [min] o altenatively fie safety class when t F = 30 min, 60 min o 90 min. documents biefly the chain behaviou of the sufaces bunin stess; compaison of the existin axial stess and the pemissible stess; compessive stess has a neative sin. minimum coss section equied fo the chain time Veification of shea foce action (DIN 4102-4/-22 5.5.2.4) DIN 4102-4 equies the examination of the fie esistance unde shea action. Until ecently, this was based on the simplified equation of condition (11l) o (11). Cuently, the veification is based on the limit state of the stuctual compaison value in accodance with the fie-potection manual Bandschutz Handbuch /1/. This appoach is pescibed by DIN 1052:2004/2008 and EN 1995. kfi M Shea stenth unde fie fv,fi = fv,d k Shea stess unde fie Shea utilization unde fie mod b d t =t y z fi,d 0,5 M by,fi dz,fi t b d 0,5 k h fi = f b d k,d y z mod v,d y,fi z,fi fi The chain depth is detemined in accodance with the specifications of the ideal esidual coss section method. b y, d z thicknesses of the initial coss sections by fi, dz fi Coss-sectional width and heiht educed thouh chain pemissible shea stenth in the stuctual desin load case f v,d,d f v,fi,fi Condition:,fi <= 1.0 existin shea stess in the stuctual veification pemissible shea stenth unde fie existin shea stess unde fie If axial foce is decisive fo the fie safety, the followin esults ae displayed: t F F30 B, R30 Chain,fi / f v,fi min b/h chain time in [min] o altenatively fie safety class when t F = 30 min, 60 min o 90 min. documents biefly the chain behaviou of the sufaces compaison of the existin shea stess and the pemissible shea stenth minimum coss section equied fo the chain time FRILO Softwae GmbH Pae 5