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CITY: /d'~k:~"~5 ~l,~,~, ~-.r .... ~:'r :-,,?~ <br /> <br />POST FRAM[{ ~UIi..,D~NG ANALYSIS USING DIAPBRAG~ THEORY <br />DESIGN FRAME USING "A MODiFiED APPROCB TO POST-'-FRANE USING <br />D~APHRAGM THEOKY ASAE(VOL-29. NO. S ~.364~137 ..... ~, <br /> <br />DESIGN LOADS; <br />SNOW 25PSF <br />ALL_OWABLE SOIL PRESSURE ].500PSF' <br />WIND BOMPI"4 EXF.'.B <br />SIDEWALL. FBAME SPACING <br />WIDTH OF BUiEL_D~NG ~/' FTS~ <br />LENGTH OF BU~I,.DING ~ FT <br />EAVE HEIGHT ~FT' .,/ <br />SLOPE OF ROOF ~/1.2 0¢~/I <br />DESIGN WIND PRESSt. JRE= <br />I=l.O QS=17~SF Ce~:~.7 Co-AS PER USC <br /> <br />Ce OVER 2OFT:::.8 <br /> <br /> Qs Ce Co DWP(20 DWP)2D <br /> WINDWARD WALL 17 .7 .8 9.52 10.88 <br /> LEEWARD WALL i7 .7 .5 5.95 6.80 <br /> ROOF LEEWARD 17 .7 .7 8.33 9,52 OUTWARD <br /> .3 3~57 4.08 INWARD <br /> ROOF WINDWARD 17 .7 <br /> ROOF VER]4? <br /> H,o~_~'~ ~_~,,~ ~2.5 + 3.0 - 3.3 = ~2,24 <br />~ ABOVE ARE FOR 12 FT BAY FACTOR FOR <br />~,S~ '-~. ~t ._,,~,~ LARGER OR SMALLER SAY <br /> <br />STEP 1.APPLY WIND LOAD AND 1/2 SNOW LOAD AND DEAD LOADS TO <br />THE BUILDING FRAME ANALOG AND PLACE A VERTICAL ROLLER AT EAVE <br />LINE 'FO DETERMINE LATERAL RESTRAINING FORCE OF THE POST <br />FRAME.(ROLLER REACTION <br />STEP 2.DETERMINE FRAME STIFFNESS (K) BY APPLYING P OF A <br />1000LBSMOR. POINT FORCE AT' THE EAVE LINE WITH NO RESTRAINTS <br />ON FRAME. <br />STEP 3.SELECT THE D~APHRAGM RESISTANCE FORCE MODIFIER(md) AND <br />THE ROOF CLADDING SHEAR FORCE MODIFIER FROM TABLES 1 AND <br />TME TESTED ROOF SHEAR FOR A ].2 FT.STEEL ROOF' PANEL IS 8?.92 <br />LBS FOR 28 GAOGE METAL FOR A 12 FT SECTION THE MAX.SHEAR <br />WOULD BE 1300L. b3S. NOW DE]'ERM~NE] K2 FROM L. UT'FRELL.'S FORMULA <br />C=E*T/[2( i+V )9/P+K2/( b '~t <br /> <br />C=29,000,000'* .O:16B <br /> <br /> 2~<(1+.3)x<1 2-K2/(:i. 44~.016~ ) 2 <br /> <br />C=2543 <br /> <br /> <br />