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CIZY: ~(~-, ~'~. - .........., , ~ <br /> o J- ............. .......... <br /> <br />DESIGN FRAME USING "A MODIFIED APPROCH TO POST-FRAME USING <br />DIAPHRAGM THEORY" ASAE(VOL.29. NO. 5 1364-Z372, 1986 ,, <br /> <br />DESIGN LOADS: <br />SNOW 25PSF <br />ALLOWABLE SOIL PRESSURE 1500PSF <br />WIND 80MPH EXP.8 <br />SIDEWALL FRAME SPACING ¢2 FT <br />WIDTH OF BUILDING }~ FT <br />LENGTH OF BUILDING ~ FT <br />EAVE HEIGHT I~ FT <br /> SLOPE OF ROOF~ /12 <br />DESIGN WIND PRESSURE= Qs;~C¢*CO*t <br /> I=l.O Qs=17PSF Ce=.7 Co=AS PER UBC <br /> <br />Ce OVER £OFT=.8 <br /> <br /> Q$ Ce Co DWP<20 QWP>20 <br /> WINDWARD WALL I7 .7 .8 9.52 10.88 <br /> LEEWARD WALL 17 .7 .5 5~95 6.80 <br /> ROOF LEEWARD 17 .7 .7 8.33 9~52 OUTWAR[> <br /> ROOF WINDWARD 17 .7 .3 3.57 4.08 ~NWARD <br /> ROOF VERT?'~w SNOW/2 +ROOF DL-ROOF HOR. <br /> H,o~4~'~,,~,,2.5 + 3,0 - 3~8 = 12_24 <br /> <br /> ~ ' ABOVE ARE FOR 12 FT BAY FACTOR' FOR <br />~,5~ ~ ~,~ ,f._~,~¢ LARGER OR SMALLER BAY <br /> <br />STEP &.APPLY WIND LOAD AND 1/2 SNOW LOAD AND DEAO LOADS TO <br />THE BUILDING FRAME ANALOG AND PLACE A VERTICAL ROLLER AT EAVE <br />LINE TO DETERMINE LATERAL, RESTRAINING FORCE OF THE POST <br />FRAME.(ROLLER REACTION) <br />STE~ 2.DETERMINE FRAME STIFFNESS (K) BY APPLYING P OF A <br />iO00L. BSMOR. 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 MODIFIER FROM TABLES I AND 2 <br />THE TESTED ROOF SHEAR FOR A 22 FT STEEL ROOF PANEL IS 87..92 <br />LBS FOR 28 GAUGE METAL FOR A 12 FT SECTION THE MAX.SMEAR <br />WOULD BE 1300LBS. NOW DETERMINE K2 FROM L. UT'f'RELL'S FORMULA <br />C=E~T/[2( I+V )g/p'~K2/( b '*t. )"'2] <br /> <br />C"=29,000 , 000* . 0165 <br /> <br /> 2*( i+ -3' )~l .2+K2/( 144, .016.)' ~ )'"'""~,, <br /> <br /> <br />