On some numerical issues in the Virtual Fields Method: optimization of testing configuration and piecewise construction of virtual fields
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(190) F #G $ *, #
(191) # # , >- , - " % . " " (, < - " 4 > < - % " , < ! >- C> " "7 C - C> 4" *>%, ! F #G 4( = 44 <4 - >-4- / - .
(192) . # # $ $ . F &G. >- , % < - C> " % - - "- < - !" "- )"D < - - - % =4 < " = ( C> 4" = 3- 4 4 - 4 0 4, - 4 < "4747"4- 4 (" F))G, - "- - 4( 44<( "( < " =4 < 4 = - " 4" = I?&, ? , ? , ?J . . .
(193) +./.3 0" 4 " 3- F15)G < - =4 < C> < 4 " <7= " " " - - 4" - (, 4 ( C> 4 , " - <" < <7= 9 %
(194) - C> 47 " 4 - ( < 4 ( " 0" 4- 4"7<4 ( , - < - 4 7 " ( 44 44( <4 = <" - 4 < % >C I
(195) , #, &J 2 > = - >- - - < 2 ' 4 ( 44( - " 4 4 9 $ - 4" = 4 ( 4 < - ' - 4 < % >C, - < - /" ' . . $ $ . . . . $
(196) $. $ % &. F G. 3- % ! F G = - & $
(197) $ 3- " 44( 4" <" - < 4 - " <4 " ( % ( ) />76 44( -" < - > $
(198) $ 3- -" - " - - - < - " 4( - 44( 44 >- - " % I
(199) J 3- < ( ' $
(200) , - & $
(201) $ C> <4 < - /" %
(202) , 4- - & $
(203) $ F G 0 ( % ' , - % ! F G . 4 - >- 4 - C> - " %% = - 15), -4 I??, ?@J - =4 < - % 4-% ( D % < ! F G 4- D % " - ' > 4- 44 4 ( ( I?J 3- " < - 4-! - < 4 - - - - < ! F G ( - 0 <" < 3- 44( "- - / - =4 < - B/ < 9%7.4--E I?
(204) J *>%, 15) " ( "( < - 4 4C =4 " 4- 4 4 ( >- C> 4 " 47< " 4 4C = ( - < 4 '.
(205) 4 3- 4 % " - 4 44 <" ( " " %
(206) > - ( < - 4 4C < 4 4" " 4 4, - 44( <4 < - " 4 <" I
(207) , #J 4- 44( <4 - 44<( < - =4 < 4 4C I?, ?#, @&J 3- " - 4- 4- < " < ' %
(208) >-4- " <( " 4 - 4 4C , < - - 4 4C < 2 % < - 4- % < - 44( - < - 4 < ( "4 " " I@ J. +./.5 0" ) ' " 3- "- 4 4 >- <7= " " % 4- = < 4 % <" - /" <7= 7 4" " " 3- 4 < - A0) > - 4 !" < - 4" >- - 4 < % >C 7 >- ( <4, - 4 < % >C > <>. . . . . ' . ! . . .
(209) "'. F G. >- % 4" = <" >-4- - 4 % = % 3- % = C" 4 ( 7 " > ! > - 4 < % >C >- " ( E % = - C> 4 - 47 % ! < " ( % = - C> " 4- - (" < ! 3- (" % - C> " < % 4 - - < A0) I@ J, - 4- - - " % 4 < 4" " 4- 47 D 0 4, - 44<( " - 4 I@, @?, @@J, ( "4 I@, @
(210) , @J - < 7 4- 4D I@#, &J < --7-4C 4" 4- 4D - - 4 < 4 I , , J 7 I?J 2 " - - 4-4 44 < % =, 4 - = 4( B4 - < 4 < - ! - (" < ! 2 - / =( < % = %<( - 4 < % >C % , < - C < "4(, 4- = > " ( 44 - <" < (" % - >- < 4" >- - ( 4 < C" 4 "( 4- % 4 > 4- 4- - - E ! < - .
(211) (" " M4( 3- 4 < - ! < 4 4( - %( < - = " >- 4 ( < - " 4" = 4 -< 4- % = >-4- < ! 3- 4- - ( "% 4 , - C " 4 44 < % = I@, J 3- %( - = 4- % = - - 4M4 < ( 4 C> - (" < ! - " D 3- C> - 4( = >- - % >C < - 4- % = < 4 *>% - 4 - / = 4-4 < 4 < 4- 4 % = 3- <" - / = " " % 4 % = 4 ( " < %( - ( - = ( > >-4- 4 - E4 < " - = " I
(212) , J 14( " M4 4 - >-4 " 4 44 < ! 4 % = >-4- > %( < - = " IJ 2- " %" - 4 < 4> 44 < % = I#J < = - = ( - " / % - >- 4" F G, -( = 4> % - 4" + - % B/( >- "- " 4 + - - - > 44 - = >7 (" - <4 4- 14 - >- " (" / = % - >- < 4" (" ! >-4- " =4 < - % E4 < ( - =4 < " 4 / " A0) - 4( ( - " - % < 4" " I
(213) &J <- / - 4 4 < 7 4 4% " =4 I
(214) J K- - "%", A0) 4" "4- "" 7 4 ( < 4" " 4- 4D %% - < <7= " " I
(215) J 3- " % < - A0) - < 4 - 7 % 4 4 < 4 =4 < - C> " ( <7= I
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