Laserfiche WebLink
POST FRAHE BUILDING ANAL. YSZS OSZNG OZAF-'HRAGM T'HEORY <br />DESIGN FRAME USING "A MODIFIED APPROCH TO POST-FRAME USING <br />DIAPHRAGM THEORY" ASAE(VOL.29. NO. S 1,364~1372. 1986 <br /> <br />DESIGN LOADS= <br />SNOW 25RSF <br />ALLOWABLE SOIL PRESSURE 1SOOPSF <br />WIND 80MPH <br />S~DEWALL FRAME SPACING I~ FT <br />WIDTH OF BUILDING 4¢ FT <br />LENGTH OF BUILDING &~ FT <br />EAVE HEIGHT /¢ FT <br />SLOPE OF ROOF ~/Z2 <br />DESIGN W;ND PRESSURE~ <br />I=l.O Q~=17PSF Ca=.7 Co=AS PER <br /> <br />Ce OVER 2OFT=.8 <br /> <br /> Qs Ce Co DWP(20 DWP)~O <br /> WINDWARD WALL 17 .7 -8 9.52 10.88 <br /> LEEWARD WALL 17 .7 ._,~ 5.95 E,_80 <br /> ROOF LEEWARD 17 .7 .7 8.33 9.52 OUTWARD <br /> ROOF'WZNDWARD '17 .7 .3 3.57 4.08 ~NWARD <br /> ROOF VERTI~'~ SNOW/2 +ROOF DL-ROOF HOR. <br /> d,~-g~-~//{k-- --t_~q,wl12.5 · 3.0 - 3.3 = ~2.24 <br /> <br /> ~ ABOVE ARE FOR 12 FT BAY FACTOR <br />~,~ ~ ~;~ ~.~ LARGER OR SMALLER BAY <br /> <br />FOR <br /> <br />STEP Z.APPLY W~ND LOAD AND i/2 SNOW LOAD AND DEAD LOADS TO <br />THE BUILDING FRAME ANALOG AND PLACE A VERTICAL ROLLER AT EAVE <br />LINE TO DETERMINE LATERAL RESTR¢INZNG FORCE OF THE POST <br />FRAME.(ROLLER REACTION) <br />STEP 2.DETERMINE FRAME STIFFNESS (K) BY APPLYING P OF A <br />iO00LBSHOR. POINT FORCE AT THE EAVE LINE WITH NO RESTRAINTS <br />ON FRAME. <br />STEP 3.SELECT THE DIAPHRAGM RESISTANCE FORCE MODIFIER(md) AND <br />THE ROOF CLADDING SHEAR FORCE MODEFIER FROM TABLES 1 AND 2 <br />THE TESTED ROOF SHEAR FOR A 12 FT STEEL ROOF PANEL IS 87.92 <br />LBS FOR 28 GAUGE METAL FOR A i2 FT SECTION THE MAX.SHEAR <br />WOULD BE ~300LBS. NOW DETERMINE K2 FROM L,.UTTRELL'S FORMULA <br /> <br />C=E*T/[2( lq'V )9/p+K2/( b '*t )^2] <br />C=~543 <br /> <br />RECEIV[D <br /> <br />MARII3N COtJNTY <br />IIUILDING INSPliCTAON <br /> <br /> <br />