1 - Alaska Energy Data Inventory

NOTE:NEITHER THE EQUATIONS NOR THE CURVES INCLUDE ! FACTOR OF SAFEIT.ACTUAL EXTERNAL HEAD SHOULD BE INCREASED BY ~ DESIRED LOAD FAC'IDR TO DETERMINE- -THE DESIGN HEAD.V. COMPARISON OF VAUGHAN & AMSTUTZ Mm'HODSThe basic di.f'ference between the two methods is t.-W mode of buckling Vlhichis assumed. . Both methods assume failure when yield 'stress is -exceeded.- -Assmnedbuckling modes are shawn in f"igure 2.€.j. of _bu,£'!!ed /,,{e n..,..,- 1 --.... --- ......... /00 ~.,.. ",,'" ....... '- " .... "-('oncrere /:/'A '.' ~ - -- ..--~./ .......-J>-, A.....•• .,,, , ....,/ to • ~.. ..... ...... '- '/""'" 1. // ••, -:. ........: :.11"'- ~ ••• ~ "W" 4 • ••• , •••: .' .'/' \ ---r f' ".....,. . . Yo=ln/;ial gap '.~~.:~. j. "I I '~:~.-:.Lining betO~ opp/icolion :.?\"""'. -'\,- \ J 9: /' \~.< .. ~,if edernal pressure . < f' \ ~ .,' n.~ / \ " '.• 4 ,.I. - ~I \,......... ~:, :. ~ flo/f wave a·' It'•• • ~ ..Linin9 afl~r app!lcofio/{J :.~ ~ hew mean line _~~I }f~~-:.of ex/ernal nressure .. ".::.. ;),.~~;: " ,-: ..~ rIO • 'l ~, 1 - •btJ, lJelbre buckling 0BUCKLING ACCORDING TO VAUGHAN~.:~. ~I /~::- ,.' " ~. I ' i.' ••.• 4: -:"-\ / .. ~ :"r '~-.:f __ '0 /' ~~,:, .:-'~:.~·~d~... ~ ~:' :r::.·;:- ...: ~: ~~", ,', .,,- '- ... . ...:.BlJCKL//v{; ACCORDING TO AMSTUTZFiguregIn all cases Amstutz gives more conservative answers :than Vaughan.Sinceboth methods are rational., one could deduce that .Amstutz bas picked a failuremechanism 1dth less f"actor of safety than bas Vaughan and therefore Amstutz's.method more closely' approaches the lower bound f"or the problem. Ideally.,of" course designs should be at the lower bound or 10"..wer if zero probabilityof failure and economy are desired. Another factor faVOring Amstutz's44