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- Ericksen Roed and Associates, Inc. �os Tir�e HANNAFORD RESIDENCE <br /> Structural Engineers <br /> 2550 University Avenue West,Ste 201-S �oe No.2015-816 SHEET NO. <br /> Saint Paul,Minnesota 55114-1904 CALCULATED BY PMB DATE 10/19/15 <br /> Telephone:651-251-7570 CHECKED BY PMB DATE 10/19/15 <br /> Snow Loads : <br /> Roof slope = 0.0 deg <br /> Horiz.eave to ridge dist(W)= 71.0 ft <br /> Roof length parallel to ridge(L)= 96.0 ft <br /> Type of Roof Monoslope <br /> Ground Snow Load Pg = 50.0 psf <br /> Risk Category = II <br /> Importance Factor I = 1.0 <br /> Thermal Factor Ct = 1.00 <br /> Exposure Factor Ce = 1.0 <br /> Pf=0.7'Ce*Ct'I'Pg = 35.0 psf <br /> Unobstructed Slippery <br /> Surface(per Section 7.4) yes <br /> Sloped-roof Factor Cs = 1.00 <br /> Balanced Snow Load Ps = 35.0 psf <br /> Rain on Snow Surcharge Angle 1.42 deg <br /> Code Maximum Rain Surcharge 5.0 psf <br /> Rain on Snow Surcharge = 0.0 psf <br /> Ps plus rain surcharge = 35.0 psf <br /> Minimum Snow Load Pm = 20.0 psf <br /> NOTE:Alternate spans of continuous beams <br /> Uniform Roof Design Snow Load = 35.0 psf and other areas shall be loaded with half the <br /> design roof snow load so as to produce the <br /> greatest possible effect-see code. <br /> Windward Snow Drifts 1 -Ac�ainst walls parapets�etc more than 15'lon4 <br /> � <br /> Upwind fetch lu = �ri00.�� d/ ,/ ,� ��`w �.-r'.,�1 ��-`'��(� <br /> Projection height h ��'"'1?:0�"ff r�- g/(/ /1�' ��v"�r���-��J <br /> Snow density g = 20.5 pcf � <br /> Balanced snow height hb = 1.71 ft <br /> hc = 9.29 ft <br /> hc/hb>0.2= 5.4 Thereforg,.s�slgn_fQ�d�ft Surcharge Load <br /> Driftheight �_..__ ,, 45 /DuetoDsilting <br /> Drift widih w = 2 . S ft �? � <br /> Surcharge load: pd=y*hd= 132.1 psf h hc hd ptl; ��; �rt��k���� <br /> �f;`z- �'�, ',;i,:, <br /> Balanced Snow load: = 35.0 psf i �,�;�y #r - �f;,;�� Balenced Snow loed <br /> 167.1 psf - ' <br /> Windward Snow Drifts 2-Aqainst walls,parapets,etc> 15' <br /> h ' <br /> Upwind fetch lu <br /> _ � W ''� <br /> Projection height h = 11.0 ft y Lu _ <br /> Snow density g = 20.5 pcf <br /> Balanced snow height hb = 1.71 ft <br /> hc = 9.29 ft <br /> hc/hb>0.2= 5.4 Thereforg,design for drift <br /> Drift height �hd = � _ _6,45 ft _�, _ - <br /> Drift width � _� 26.78 ft <br /> Surcharge load: pd=y"hd= 132.1 psf <br /> Balanced Snow load: = 35.0 psf <br /> 167.1 psf <br /> � <br />