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HomeMy WebLinkAboutPermit Correspondence 2002-1-28 -,...J . . Memo To: Address File From: Don Moore, Cons!. Representative/Plans Examiner cc: Tom Marx Date: 1/28/02 Re: Perforated shear walls at Emerald Empire Art Assn. Bldg. 500 Main Street, Springfield, OR Additional calculations were submitted for two interior shear walls for the subject building by Keating Engineering. The calculations and accompanying drawing confirm that the placement of the existing holes in the walls will not interfere with the required shear values for the walls as shown. I called the engineer to confirm whether he is aware that the larger hole (21"x21") in the "interior shear wall with penetrations" has cut through a vertical 4x4 stud located in the wall. Mr. Keating stated that the 4x4 studs were necessary because of the nailing requirements for the wall, but the cut stud will not . significantly weaken the wall in either shear or bearing. He said that additional blocking or headers would not be required between the severed stud and adjacent studs. I also asked Mr. Keating about the special nailing at the bottom plate (16d @2"0.c.)andthetopofwall connections (A-35's at 6" o.c.). He said that they were requirements in the original wall design, and were not changed in this calculation. He noted that he did not observe those walls before they were covered with finish materials, but has no reason to believe that the walls would have been built without the required connections (the walls are now enclosed with finish materials). Note: The subject walls were originally framed under a previous building permit. . Page 1 .~~ . PERFORATED SHEAR WALL Plywood sheathed panels with openings included Desioned per American Plvwood Association #157 (19! ./ , " I, ,-w \: . Project: EMERALD EMPIRE ART 500 MAIN STREET SPRINGFIELD. OR Shear wall no: I SEE DRAWINGS Shear wall location: LOWER WALL AT ELEVATOR LOBBY AREA wind stagnation pres. I cocoa. at h<25' =I Input parameters: lesign wall length: lesign wall height: 'eact. from above: shear from above: in-plane shear: Factors for AP A . equations opening lengths' opening areas wall area a B r F Shear panel data: I unit shear: I comer forces: 16.61PSF tributary area: I Page: I Date: I Proi no: I I 11/021 00-10 I 19 FT 8FT o LBS o LBS 11155.2 LBS applied DL from roof: applied DL from walls: applied DL from floors: applied LL from roof: applied LL from walls: applied LL from floors: 672150. ft. 20 LBS 100 LBS o LBS o LBS o LBS o LBS DESIGN: TYPICAL SHEAR PANEL SHEATHING: I~" CDX PL YWD OR 7/16" OSB SHTG. NUMBER OF FACES (ONE SIDE OR TWO SIDE): INSTALL SHTG ON I 2 SIDE(S) MINIMUM SHEAR PANEL FIELD NAiLING: 8d COM. NAILSAT I 8 INO.C:::; ..",".:;:;.~' MINIMUM SHEAR PANEL-EDGE NAILING: 8d COM. NAILS ATI. 4 IN O.C. STUD DIMENSIONS AND SPACING (#2 D FIR): 2X4 STUDI 16 IN O.C. CHORD LUMBER (#2 D. FIR) DOUBLEI2X4 BOTTOM PLATE MEMBER (#2 D FIR): 12X4 I NAILING OF BOTTOM PLATE TO FLOOR: 18d COM, NAIL ATi DRAG STRUT/COLLECTOR AT TOP OF WALL: SHEATH THRU FLOORi CONNECT BLOCKING AT TOP TO DIAPHRAGM: SIMPSON A351 HOLD-DOWN HARDWARE: ASS INSTALLED ANCHOR: I AS INSTALLED 5.1 'total length of window openings (feet) 4.72 total area of openings (sq ft) 152 (sq It) 0.03 area of openings/area of wall (sq It) 0.73 summation offull height sectionslwalllength 0.96 area factor 1/ (l+alB) 0.8870 Ireduction coefficient for wall rll3-2r) 662IPLF 3841ILBS see design evaluation below uplift and bearino NEGATIVE VALUE 2INO.C. 6INO.C. 1 NO NET UPLIFT lOADS ON SHEAR WAll RAFTERS AND EXISTING STRUCTURE NOT CONTRIBUTING LOADS TO SHEAR WAll EVALUATES EXISTING SHEAR WALL AS PERFORATED ASSEMBLY ". -, Keating Engineering LLC -188 West B Street- Bldg P - Springfield - Oregon - 97477.. (541) 726-9995 .- ./ .' ~ '''-=:-:: .~. or PROJECT: EMERALD EM'-ART ASSOCIATION .- ~ -=""I JOB 00-10 DATE:11-15-01 =:..... :... ~.... . e>1~_E:'1~\rl.lS'13'."f.":~~U. .., ,..____.. l....l~~ ~ ~. U ,1 '1':'\ P~-.)'\.$.._' , o ~ .~t. i. Qv \~ I I", 30 LI 2.\ Ai 0.66 t [.,o~9l- '~ 0 l..D f1H 1 " 41, .t.. ...,.., -, g' ~,( I. , . .".-.. -.--.---. --_.- .. .._..~~--.:--~-."k ~~.:~.:.~--:::=::.::---::.::..:.:...:.:._-_.-.:::.:. ..K~atlng En'6i~i~g LW;~ West B street Building p: Springfield, ,Oregon.. ~7.~:'-rr.- P(541)726-9995 - F (~1)~~ ,. ~ el'!'lail: keatinaeno/B)msn.com': . .- ,'1-