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f�ooa/oos <br /> 08/23/2004 15 16 FAT 4257785536 <br /> � Page 2 of 2 <br /> �q Z _Design of Fire-Resistive Exposed Wood:�tembers <br /> Where spacific fire reelstence tlmes ere tequlred, relallonshipe betw9en loed end endurence tlme for wood <br /> performflnce of wood momCers over such pericds mey be beems exposed on three eidee ere ahown in Fio��re'+. <br /> celculated es follews: qppflcatlon <br /> The lormula for columns exposed to fire on three sidea <br /> �eat0s: applles onty when the unexpoaed face is lhe emaller column <br /> (1)tlre expaeure on four sldes ' dlmenelon,Where the column ia rece�ead in e we��, It�full <br /> �=2.54 z b[4-2(b/d)]I dlmenslon shell be us�d for tho purpose of the calculatlons. <br /> i <br /> (Z)flre exposure on three sides � Allowablo loede on beema end columns are delBef nce t n� g <br /> t=2.54 z b[4-(b/d)] � design prxeduroe hom the Natlona!Design Sp <br /> ! IorWood Constructlon (d�,+�J• <br /> whore: b= 1�eadch(width)of beam befote fire <br /> CXpOSUfe in inChes I Glued IeminBted tlmber beem8 utilize standerd leminetlnp <br /> � comb�^etions exeopt thal a core 18mination le removed,the <br /> d - depth of beam befo[e fire exposure (in tenslon�one ie moved Inwerd, end the equlvelent ot en extro <br /> nomin ?•�nch thlck outer tenalon laminedOn le edded. <br /> inches) � <br /> z = load factor(see FjyL[e_1) yyhere onu-hourflro enduranceisrequlred, cannuctors and <br /> = 1.3 for r<-0,5 fastenera must ba protectad from flre oxposure by �•5r vadefor <br /> = 0.7*0,3/r for r>0:� of waod,fire•rated gyp6um board, or eny coeting epp <br /> t = ratio of induced load to maximum allowaUle a one hour rating�Typieel detalls for commOnly ue9d <br /> i tasleners end wnneCtor9 In tlmber framing are shoWn in <br /> F;ay(geem tc Column Connectlon Nol Exposed to Flre), <br /> l0ad r'"'�(Beam to Column Connectlon E�cposed to�Ira <br /> t = fire eedurance(in minutes) Whare Appearence Is e Factor),EiguteB ICelling <br /> Ccnatruc��on),£ie�(Beem to Column Connectlon <br /> � Exposed to Flre Where Appe9rence Is Not efactor), F;^,� <br /> Columns: �Column Connectlona •Covered),F�O�-�(Baam to Girder - <br /> (1)(Ire exposure an four sidas ' Conceelod Connectlon). <br /> t=2.54 z d [3-(�b)�� <br /> (p)pro axposure an three sldes <br /> t= 2.54 z d [3-(d�b)�Z) <br /> Tne arocedure tla��de�d In Ihb broch�re u iM�nded io r��4t me de�qner of <br /> Wh6fB: b = R19X1IIIllM d1iI18i1510[1 Of CO�UI71II t1C�0I0 fITG �imyer hamed ewmuro�In�chievin0 O��DI�paAom+ena w�����6P��1'°a n� <br /> e <br /> endurenoB reQulremen9�.Spe�lel aflo8 N+baon mede Ic ef�uro N�� e <br /> exposure(in inches) I infom�albn t��acte�ha a1b�9 d ma Y e1�Ib+��'�R WI'���q s�or�abul�tone <br /> d = minimum dimension of column before fire ��„U����?Ii Wb?��n�ep� �r °' <br /> exposuro (in inches) � <br /> Z = load factor(sae FiQsuall <br /> = 1.5 for K�Lldt- 11 nnd r<-0,5 For additionel Informatlon or aselstance contect: <br /> = 0.9 -0.3/r for KeTJd�= 11 and r>0.5 Amerlcnn Forest S Pepor Aesocietion <br /> = �,3 for K�IJd> 11 nnd r<=O,5 1111 1Bth Slreet, NW, Sulle 800 <br /> = 0.7+0.3/r for IC�L/�> 11 and r>0,5 Washington,oC 20038 <br /> ....,••�aw -.r ora <br /> r = ratio of induced load to maximum Zo2-483�»3 <br /> allowable load ' <br /> K� effective length factor�raeo Eipu[e2) <br /> CePYhOh�(e)200t Amatlom Forvt s v�p�r AnoW�Uan,ine. <br /> L = effective ]cngth(in inches) p�y q000 RWldoe <br /> t = fire endurance (in mi��utes) <br /> Ench ot lhe farogoing equotlons reiatos andurence tlme to the —^ <br /> perCent of maxlmum elloWebie daeign load oppllad and Uoss <br /> seclion dlmensio�s, For given member sizes,dlHeranl <br /> andurance timas cen be��Ied totheYmembortExamplestof <br /> maxlmum deslpn load app ���� <br /> I /� <br />