Loading...
HomeMy WebLinkAboutReport (40) Snow Drift Calculation 2009 International Buildin• Code- Lower roofs and Decks(Sliding Snow and DriftingSnow) Section 1608.7 User Defined Minimum Roof Snow: 25 psf ASCE 7-02 Section 7.7.1 and 7.9 Roof Exposure _ ,Partially Exposed Terrain Category = B Thermal Condition = AU structures except as indicated below - - I Building Category II Design Snow Load(Pg) = 25.0 psf Minimum Ground Snow Load C8 = 1.0 ASCE7-02 Table 7-2 C1 = 1.0 ASCE7-02 Table 7-3 I = 1.0 ASCE7-02 Table 7-4 Roof Snow Load(Pr) = ®psf =0.7*Ce*Ct*l*P Height to Upper Roof(h) = 6.00 ft 9 Minimum roof snow load=25 psf Upper Roof Length(L) _ Lower Roof Length 25.0 ft(25ft min) g (4) = 8 ft Will Drifting Occur?(hdhb) = 4.9 Roof Slope(x:12) = 60.2 Drift loads are required .00 Roof Composition = Other !w Distance from Ridge to eave(W) = 16 ft hO = 5.0 ft Snow Density(y) =h-h, 17.25 pcf =0.13P9 + 14<=30 Design Snow Height(he) = 1.01 ft =P,/y Sliding Snow Height(h3) = 0.43 ft Total Leeward Drift Height(h.) = 1.56 ft =(.4310.*L 43 *W/y (.431u I/3*(P9+10)iia-1.5) Total Windward Drift Height(hd) = 0.44 ft Total Snow Hei ht =( 4)*(43 LL r *(P9+10)'14-1.5) g (hm) = 3.01 ft =hb+hd+hs Max. Snow Load(Pm) = 51.8 Drift Width(Wd) - psf = y(hb+hd+hs) 6.23 ft Slope of Drift = 0.25 ft/ft Design Drift Width(•yds) = Pm Decreases to P,linearly 4.49 ft Drift len th d' Design roof snow load= 17.5 psf 9 (W ) 4.49 feet Maximum drift load=26.9 psf Sliding snow length(Sd)=8 feet Sliding load=7.5 psf Maximum total load I=51.8 psf Minimum total load=25 psf sd Pm Lu - Upper Roof IllIllIRli 111 Wd Wd' r 1111111 25 sf m' IIIIIIIillift..- Ff P in. `ro�ec `ame�oo 1111111111111111111111111emo•. 11'r' I - Lower Roof Project# 13-169 Location 10417 SW Bonanza Way, Tigard, Oregon WREN THOMAS c°NSU"'N4L` Client 10372 SW Bonanza Way Tina and Tony Ahlbrect Tigard,OR 97224 503-3174M LMT By LicpnctarJlgmaiLcom Date 12/26!13 ______ page of to 52 P 4,0 1- wt Ii\A -z_ 42,s 4C-1' ( 2.0) 2.- 5—D+1)Pr t 2�1f' 16$ Pt.r- , Olo ( o ) µ \Q 'r z V30 -C\e?c. SS() 12-,\ ckc ‘k.f. 6:14 ( ( .$ ) z Gc- co -eV° .c , 15.CYI' i L 2 tom z. � $ YA, - C A 2 e. (al, 2 >� L (') 4 J Z bF - JP- Poor ` Project Name Nook Remodel LTC Project # 13-169 alw Location 10417 SW Bonanza Way,Tigard, Oregon L., Tr,a�s Client 10372 SW Rosana Way Tina and Tony Ahlbrect Tigard,OR 97224 383317.tU7S gY LMT Date 12/26/13 Page 7 of 0 1 '9) z ( g•-) c \c- CLE-uKt7! Q 0 L- 7 2 -- - Go 1 Ply ta 41- 2 C >(\io) x Coo ?_: -- z 40 ( 4)( w) z 2 0 )(CO 7- cCS'r1/4.- _f,t/ Ii DQE 1 2CuG r 6V6- 6118 'XiI (. 4. 1 o j _ .___-tc c 12.-1 CC s 13 S 3k o . 1 .s Project Name Nook Remodel LTC Project# 13-169 Location 10417 SW Bonanza Way, Tigard, Oregon L.waoa Maws `°'�7"°" Client Tina and Tony Ahlbrect I0372 SW Beaman Way Tigard,OR 97224 30},17.�B27 By LMT L"""""``�'�"`°m Date 12/26/13p Page 0 of12 lIlIllIIl. . Lauren Thomas Consulting, LLC Tigard, Oregon Wood Column Design Solid Wood Column Calculation (per NDS) IIMMEEEnin Column Length, le= 9 feet le=I 108 Inches Width,d= 5.5 Inc I 5.51Inches (Least Dimension) Slenderness Ratio, le/d=I 19.64 'Note: Slenderness shall be<50, < 75 during const. Column Stability Factor, Cp Cp= [1+ (FcE/Fc*))/2c-{[1+ (FcE/Fc*)/2c]2-(Fez/Fel/c}1/2 = 0.57 Where: Fc*= Fc(CDxCMxCtxCfxC.) Material = 1725 PSI F WM Microllam LVL F E�/(l�d)z Sawn Lumber(DF/L#2+) 1500 1,400,000 Glu Lam (22F) 1500 1,600,000 = 1244.85597 Selected Values: 1500 1 600,000 FCE/Fc*= 0.72165563 Adjustment Factors: Table Load Duration,* CD_NEU[2.3.2] Wet Service,* CM= 1.00 [2.3.4] Temperature,* CT= 1.00 Beam Stability, CL= 1.00 KcE= 0.3 (Visually Graded Lumber) Volume Factor, Cv= 1.00 Flat Use, Crii= ' 1.00 c= 0.8(sawn lumber) . # Incising,* C. c= 0 85,(round timber piles) Repetive Use, = 1.00 [2.3,11] c=0.9(glued-laminated timber) Curvature, CrC = 1.00 1.0/1.15 Selected Value I0.8 I Cc= 1.00 Shear Stress Factor,* CH= 1.00 1.0-2.0 Fc= F'c(Adjustment Factors)= _h, Fc= Fc*x Cp=I 983.7443IPS1 Selected Column Dimensions= k(p D rtblY 5,5 'inches x � 5.5 (inches 'Allowable Column Load=Pan= 29,758 pounds I 7 Iaj(0 .,0(1 Project Name Nook Remodel ATC Project# 13-169 Location 10417 SW Bonanza Way,Tigard, Oregon LAUREN TMauS cotatmquc Client Tina and Tony Ahlbrect 10372 SW Bows*way Tigard,OR 97224 50.317407J a 2g By LMT L'"""'""' '""''`°" Date 12/26/13 Page of �U X1 6) 3 2."D.C. V ..... INz.s- \L zS(1(--. ill.-.2a: - CE ) bc 10 NV IF '1 @ P .:-- 2p0 S ti T- -(} 4 L . 34v4 TA-12-vi f•A)v . V/ - DC0c A I soc 1,,ra...... z 2 « :, „ 00 = ti-(oil- a 1�32 et-ie- 00 0 ; Li) - r 9 12c p,g-- �DC'�)C I Li)r }'S7 , )9 2)2 f .. ... O cSD eesOC 7D t2 ` ? z 2 cis _,. 4 6 4 10 ) r , k ---—/HA--i---7f' 3µ 3� 3 H v Project Name Nook Remodel iTt Project# 13-169 Location 10417 SW Bonanza Way, Tigard, Oregon LAUREN THOMAS c°"9"444 11C Client Tina and Tony Ahibrect 10372 SW 8061111:0 Way 'WWII,OR 97220 Ltcararuniy 1 x >�3aiLcam By LMT : Date 12/26/13 Page \0 of O