ĂĂÖĒïïÙćîß Ć Ě î 2 µ B45, B46, B47, B48 Áȵn°ÁºÉ° ¦³´ =+3.5 ¤¸nª¡µ 1.8, 3.4, 2.2 ¨³ 3.6 m ¦ ´ ´ ¡Êº ¨³µ µ ĂĂÖĒïïÙćî B45, B46, B47, B48 ðøąöćèîĞĚćĀîĆÖ îĞĚćĀîĆÖêĆüđĂÜ ÿööčêĉ×îćé 0.2x0.4 =0.2x0.4x2400 =192 ÖÖ./ö. îĞĚćĀîĆÖÖĞćĒóÜÖŠĂ =180x2.7 =486 ÖÖ./ö. îĞĚćĀîĆÖóČĚî ÖüšćÜ 3.6 =0.1x2400x3.6/2 =432 ÖÖ./ö. îĞĚćĀîĆÖóČĚî ÖüšćÜ 3.2 =0.1x2400x3.2/2 =384 ÖÖ./ö. îĞĚćĀîĆÖóČĚîÖüšćÜ 1.3 =0.1x2400x1.3/2 =156 ÖÖ./ö. îĞĚćĀîĆÖóČĚîÿĂÜìćÜ =0.1x2400x(1.8/3) =144 ÖÖ./ö. îĞĚćĀîĆÖïøøìčÖÝø óČĚîÖüšćÜ 3.6 =150x3.6/2 =270 ÖÖ./ö. îĞĚćĀîĆÖïøøìčÖÝø óČĚîÖüšćÜ 3.2 =150x3.2/2 =240 ÖÖ./ö. îĞĚćĀîĆÖïøøìčÖÝø óČĚîÖüšćÜ 1.3 =150x1.3/2 =97.5 ÖÖ./ö. îĞĚćĀîĆÖóČĚîÿĂÜìćÜ =150x(1.8/3) =90 ÖÖ./ö.
ĂĂÖĒïïÙćî B45, B46, B47, B48 Ùćî B45 Wu=1.4(192+144)+1.7(90) =623 kg/m Ùćî B46 Wu=1.4(192+486+432+384)+1.7(270+240) =2,959 kg/m Ùćî B47 Wu=1.4(192)+1.7(0) = 269 kg/m Ùćî B48 Wu1=1.4(192+432+156)+1.7(270+97.5) =1,498 kg/m Ùćî B48 Wu2=1.4(192+432+384)+1.7(270+240) =2,278 kg/m ĒøÜðäĉÖĉøĉ÷ć ÝćÖÙćî B66 Ēúą B67 ĒøÜðäĉÖĉøĉ÷ć ÝćÖÙćî B75 Ù ĞćîüèĒøÜðäĉ Ö ĉ ø ĉ ÷ćÝćÖÙćî B66 Ùćî B66 îĞĚćĀîĆÖÙćî =0.15x0.3x2400 = 108 kg/m îĞĚćĀîĆÖóČĚî DL =240x(0.95+1.25)/2 = 264 kg/m îĞĚćĀîĆÖóČĚî LL =150x(0.95+1.25)/2 = 165 kg/m Wu = 1.4(108+264)+1.7(165) = 801 kg/m Mu = WuL2 /8 =801x1.32 /8 = 169 kg-m Vu=Ru = WuL/2 =801x1.3/2 = 521 kg
Ù ĞćîüèĒøÜðäĉ Ö ĉ ø ĉ ÷ćÝćÖÙćî B49 Ùćî B49 îĞĚćĀîĆÖÙćî =0.15x0.3x2400 = 108 kg/m îĞĚćĀîĆÖÖĞćĒóÜ =180x0.90 = 162 kg/m Wu = 1.4(108+162)+1.7(0) = 378 kg/m Mu = WuL2 /8 =378x1.252 /8 = 74 kg-m Vu=Ru = WuL/2 =378x1.25/2 = 236 kg Ù ĞćîüèĒøÜðäĉ Ö ĉ ø ĉ ÷ćÝćÖÙćî B67 Ùćî B67 îĞĚćĀîĆÖÙćî =0.15x0.3x2400 = 108 kg/m îĞĚćĀîĆÖÖĞćĒóÜ =180x0.90 = 162 kg/m îĞĚćĀîĆÖóČĚîÖüšćÜ 0.95 ö. (DL) = 240x0.95/2 = 114 kg/m îĞĚćĀîĆÖóČĚîÖüšćÜ 1.25 ö. (DL) = 240x1.25/2 = 150 kg/m îĞĚćĀîĆÖóČĚîÖüšćÜ 0.95 ö. (LL) = 150x0.95/2 = 71 kg/m îĞĚćĀîĆÖóČĚîÖüšćÜ 1.25 ö. (LL) = 150x1.25/2 = 94 kg/m Wu1 = 1.4(108+162+114)+1.7(71) = 776 kg/m Wu2 = 1.4(108+162+114+150)+1.7(71+94) = 1146 kg/m îĞĚćĀîĆÖÖøąìĞćđðŨîÝčéÝćÖÙćî B49 Pu = 236 kg
Ù ĞćîüèĒøÜðäĉ Ö ĉ ø ĉ ÷ćÝćÖÙćî B67 ĒøÜðäĉÖĉøĉ÷ćÝćÖÙćî B67 = 799 ÖÖ. Ù ĞćîüèĒøÜðäĉ Ö ĉ ø ĉ ÷ćÝćÖÙćî B44 Ùćî B44 îĞĚćĀîĆÖÙćî =0.15x0.3x2400 = 108 kg/m îĞĚćĀîĆÖÖĞćĒóÜ =180x2.7 = 486 kg/m îĞĚćĀîĆÖóČĚîÖüšćÜ 1.3 ö. (DL) = 240x1.3/2 = 156 kg/m îĞĚćĀîĆÖóČĚîÿĂÜìćÜ (DL) = 240x1.8/3 = 144 kg/m îĞĚćĀîĆÖóČĚîÖüšćÜ 1.3 ö. (LL) = 150x1.3/2 = 97.5 kg/m îĞĚćĀîĆÖóČĚîÿĂÜìćÜ (LL) = 150x1.8/3 = 90 kg/m Wu = 1.4(108+486+144+156)+1.7(90+97.5) = 1,570 kg/m ĒøÜðäĉÖĉøĉ÷ć Ru = WuL/2=1570x1.8/2 =1413 kg
Ù ĞćîüèĒøÜðäĉ Ö ĉ ø ĉ ÷ćÝćÖÙćî B75 Ùćî B75 îĞĚćĀîĆÖÙćî =0.2x0.4x2400 = 192 kg/m îĞĚćĀîĆÖÖĞćĒóÜ =180x2.7 = 486 kg/m îĞĚćĀîĆÖóČĚîÿĂÜìćÜ (DL) = 240x1.8/3(3-(1.8/1.9)2 )/2 = 151 kg/m îĞĚćĀîĆÖóČĚîÿĂÜìćÜ (LL) = 150x1.8/3(3-(1.8/1.9)2 )/2 = 95 kg/m Wu1 = 1.4(192+486+151)+1.7(95) = 1,322 kg/m Wu2 = 1.4(192)+1.7(0) = 269 kg/m ĒøÜðäĉÖĉøĉ÷ćÝćÖÙćî B44 = 1,413 kg R= 1,863 kg ĂĂÖĒïïÙćî B45, B46, B47, B48 2192 -968 2127 -3704 -1381 -1867 -2440 Vu=5,326
ĂĂÖĒïïÙćî B45, B46, B47, B48 ksc bd M R u 16.80 20 35 / 3704 100/0.9 2 2 u u I đĀúĘÖđÿøĉöêćö÷ćü 0.0059 3,000 2 14.71 16.80 1 1 14.71 2 1 1 1 1 ¸ ¸ ¹ · ¨ ¨ © § u u ¸ ¸ ¹ · ¨ ¨ © § yf mR m U 14.71 0.85 240 3,000 0.85 u c c y f f m 2 As Ubd 0.0059 u 20 u 35 4.13 cm 0.0388 6,120 3,000 6,120 3,000 240 0.85 0.85 6,120 6,120 0.85 1 ¸ ¸ ¹ · ¨ ¨ © § ¸ ¸ ¹ · ¨ ¨ © § u ¸ ¸ ¹ · ¨ ¨ © § ¸ ¸ ¹ · ¨ ¨ © § c y y c b f f f U E ĂĂÖĒïïÙćî B45, B46, B47, B48 Ĕßš 4-DB12 As cm cm OK 2 2 2 1.2 4.52 4.13 4 4 u ! S đĀúĘÖđÿøĉö×ĆĚîêĞęć °¯ ° ® u u u 2 2 1.33 1.33 4.13 5.49 (14/ ) (14/3000) 20 35 3.27 min A cm f bd cm A scal y s 2 đĀúĘÖđÿøĉöÿĎÜÿčé As max 0.75Ubbd 0.75 u 0.0388 u 20 u 35 20.37 cm 9
ĂĂÖĒïïÙćî B45, B46, B47, B48 đĀúĘÖđÿøĉöêćö×üćÜ ĀøČĂđĀúĘÖøĆïĒøÜđÞČĂî đóČęĂÙüćöÿąéüÖĔß Vš u ĒøÜđÞČĂîüĉÖùê ìĊęåćîøĂÜøĆï = 5,326 kg ÖĞćúĆÜêšćîìćîĒøÜđÞČĂîēé÷ÙĂîÖøĊê IVc = 0.85x0.53(f’c ) 0.5bw.d IVc = 0.85x0.53(240)0.5x20x35 = 4,885 ÖÖ. < Vu IVs = Vu-IVc = 5,326-4,885 = 441 kg I1.1(f’c )0.5bw.d=0.85x1.1x(240)0.5x20x35 = 10,139 > IVs ¤¤»·Ä 1-RB6 o 2 2 0.6 0.565 4 Av 2u u cm S ¸ ¸ ¹ · ¨ ¨ © § cm d b A f s w v v ,60 2 , 3.5 max min ĂĂÖĒïïÙćî B45, B46, B47, B48 ¸ ¹ · ¨ © § u u 19.4,17.5, 60 3.5 20 0.565 2,400 Smax min ´ Ê´ÄÁ®¨ o È [email protected] m ¨°µ cm V A f d s v v 91 441/0.85 0.565 2,400 35 u u Smax min 91,19.4,17.5, 60 cm b A f d w v v 19.4 3.5 20 0.565 2,400 3.5 u u
ĂĂÖĒïïÙćî B45, B46, B47, B48 ēöđöîêŤ ßîĉé As, required As, max ÝĆéđĀúĘÖđÿøĉö As, Provided êøüÝÿĂï (kg-m) (cm2 ) (cm2 ) (cm2 ) (14/fy)bd 1.33As,cal 967 ïüÖ 1.05 20.37 2-DB12 2.26 3.27 1.40 OK 0 ïüÖ 0 20.37 2-DB12 2.26 3.27 0.00 OK 2,440 úï 2.66 20.37 3-DB12 3.39 3.27 3.54 OK 2127 ïüÖ 2.31 20.37 3-DB12 3.39 3.27 3.07 OK 1867 úï 2.03 20.37 3-DB12 3.39 3.27 2.70 OK 0 ïüÖ 0 20.37 2-DB12 2.26 3.27 0.00 OK 1381 úï 1.47 20.37 2-DB12 2.26 3.27 1.96 OK 2192 ïüÖ 2.38 20.37 4-DB12 4.52 3.27 3.17 OK 3704 úï 4.13 20.37 4-DB12 4.52 3.27 5.49 OK As, min ĂĂÖĒïïÙćî B45, B46, B47, B48 /Q /Q 2 DB¤¤. . RB¤¤. #0.1 ¤. 2-DB¤¤. B1 SECTION 1-1 2 DB¤¤. . RB¤¤. #0.1 ¤. 2-DB¤¤. B2 Á¦·¤¡·Á«¬ 1- DB¤¤. SECTION 3-3 2 DB¤¤. . RB¤¤. #0.1 ¤. 2-DB¤¤. B2 Á¦·¤¡·Á«¬ 1- DB¤¤. SECTION 2-2 /Q 2 DB¤¤. . RB¤¤. #0.1 ¤. 2-DB¤¤. 2 DB¤¤. . RB¤¤. #0.1 ¤. 2-DB¤¤. SECTION 4-4 SECTION 5-5 B3 B3 Á¦·¤¡·Á«¬ 2- DB¤¤. Á¦·¤¡·Á«¬ 2- DB¤¤. /Q /Q
ĂĂÖĒïïÙćî B71, B72, B73 µ B71, B72, B73 Áȵn°ÁºÉ° ¦³´ =+3.5 ¦ ´ ´ ¡Êº ¨³µ µ ĂĂÖĒïïÙćî B71, B72, B73 ðøąöćèîĞĚćĀîĆÖ îĞĚćĀîĆÖêĆüđĂÜ ÿööčêĉ×îćé 0.2x0.4 =0.2x0.4x2400 =192 ÖÖ./ö. îĞĚćĀîĆÖÖĞćĒóÜÖŠĂ =180x2.7 =486 ÖÖ./ö. îĞĚćĀîĆÖóČĚî ÖüšćÜ 1.25 =0.1x2400x1.25/2 =150 ÖÖ./ö. îĞĚćĀîĆÖóČĚî ÖüšćÜ 0.50 =0.1x2400x0.50/2 =60 ÖÖ./ö. îĞĚćĀîĆÖóČĚîÿĂÜìćÜ (DL) =240x(1.8/3)x(3-(1.8/1.9)2 )/2 =151 ÖÖ./ö. îĞĚćĀîĆÖïøøìčÖÝø óČĚîÖüšćÜ 1.25 =150x1.25/2 =94 ÖÖ./ö. îĞĚćĀîĆÖïøøìčÖÝø óČĚîÖüšćÜ 0.50 =150x0.5/2 =38 ÖÖ./ö. îĞĚćĀîĆÖóČĚîÿĂÜìćÜ (LL) =150x(1.8/3)x(3-(1.8/1.9)2 )/2 =95 ÖÖ./ö.
ĂĂÖĒïïÙćî B71, B72, B73 Ùćî B71 Wu = 1.4(192+486+60)+1.7(38) =1,098 ÖÖ./ö. Ùćî B72 Wu1 = 1.4(192+486+60+151)+1.7(38+95) =1,471 ÖÖ./ö. Ùćî B72 Wu2 = 1.4(192+486+150)+1.7x(94) =1,319 ÖÖ./ö. Ùćî B73 Wu = 1.4(192+486)+1.7(0) =949 ÖÖ./ö. îĂÖÝćÖîĊĚĒúšü÷ĆÜĕöĒøÜÖøąì Š ćđðĞ ŨîÝčé ÝćÖÙćîòćÖ Ùćî B37, B38 =2,018 ÖÖ. Ùćî B70 =208 ÖÖ. Ùćî B43, B44 =4687 ÖÖ. Ùćî B49 =236 ÖÖ. àċęÜĔîìĊęîĊĚöĉĕéšĒÿéÜÖćøÙĞćîüèĂ÷ŠćÜúąđĂĊ÷é ĂĂÖĒïïÙćî B71, B72, B73
ĂĂÖĒïïÙćî B71, B72, B73 ēöđöîêŤ ßîĉé As, required As, max ÝĆéđĀúĘÖđÿøĉö As, Provided êøüÝÿĂï (kg-m) (cm2 ) (cm2 ) (cm2 ) (14/fy)bd 1.33As,cal 1,408 úï 1.54 20.37 3-DB12 3.39 3.27 2.05 OK 3,253 ïüÖ 3.57 20.37 4-DB12 4.52 3.27 4.75 OK 2,717 úï 2.94 20.37 3-DB12 3.39 3.27 3.91 OK 346 ïüÖ 0.35 20.37 3-DB12 3.39 3.27 0.47 OK 237 úï 0.28 20.37 3-DB12 3.39 3.27 0.37 OK As, min ĂĂÖĒïïÙćî B71, B72, B73 /Q 2 DB¤¤. . RB¤¤. #0.1 ¤. 2-DB¤¤. B3 SECTION 3-3 2 DB¤¤. . RB¤¤. #0.1 ¤. 2-DB¤¤. B2 Á¦·¤¡·Á«¬ 1- DB¤¤. SECTION 1-1 2 DB¤¤. . RB¤¤. #0.1 ¤. 2-DB¤¤. B2 Á¦·¤¡·Á«¬ 1- DB¤¤. SECTION 2-2 /Q /Q /Q /Q /Q /Q Á¦·¤¡·Á«¬ 2- DB¤¤. ÿĞćĀøĆïÙćîĂČęîė ĔîßĚîÿĂÜÿćöćøëì Ć ĞćĕéšĔîìĞćîĂÜđéĊ÷üÖĆî
°°ÂÁµ (Áµ Ê ´ 2) ÁµÊ ´ 2 grid line B4 ¦´ ʵ® Î µ®¨ ´ µ ´ 2.9 m 3.4 m ¨®¨µ ´ ĂĂÖĒïïđÿć ðøąöćèîĞĚćĀîĆÖëŠć÷úÜđÿć îĞĚćĀîĆÖêĆüđĂÜ ÿööčêĉ×îćé 0.2x0.2 =0.2x0.2x3.0x2400 =288 ÖÖ. îĞĚćĀîĆÖÝćÖĀúÜÙć Ć óČĚîìĊęøĆïñĉéßĂïĀúĆÜÙć×ĂÜđÿć =2.9x3.4 =9.86 ö. 2 îĞĚćĀîĆÖüĆÿéčöčÜ (CPAC) =50 ÖÖ./ö. 2 îĞĚćĀîĆÖēÙøÜĀúĆÜÙćÙĞĚć÷îĆ =25 ÖÖ./ö. 2 îĞĚćĀîĆÖòŜćđóéćî =11 ÖÖ./ö2 øüöîĞĚćĀîĆÖêć÷êĆü= (50+25+11)x9.86 =848 ÖÖ. îĞĚćĀîĆÖïøøìčÖÝø = 30x9.86 =296 ÖÖ. Pu=1.4(848)+1.7(296) = 1,690 ÖÖ.
ĂĂÖĒïïđÿć ĂĂÖĒïïđðŨîđÿćÿĆĚî (đÿćðúĂÖđéĊę÷ü) IPn=I0.80P0 = 0.70x0.80[0.85f’c (Ag - Ast) + fy Ast] Ĕßšđÿć×îćé 20x20 àö. đÿøĉöđĀúĘÖ 4-DB12 A g = 20x20 = 400 cm2 Ast = 4x1.131 =4.52 cm2 IPn = 0.70x0.80x[0.85x240x(400-4.52)+3000x4.52] IPn = 52,773 ÖÖ. > 1,690 ÖÖ. OK ĂĂÖĒïïđÿć ÖĞćĀîé×îćéĒúąøą÷ąđøĊ÷ÜđĀúĘÖðúĂÖ ĔßšđĀúĘÖ÷Čî DB12 ĒúąĔßđĀú š ĘÖðúĂÖ RB6 øą÷ąđøĊ÷ÜđĀúĘÖðúĂÖĕöđÖŠ ĉî Smax = min (16Il , 48Is , éšćîĒÙïÿčé×ĂÜđÿć) = min (16x1.2 , 48x0.6 , 20) = min (19.2, 28.8, 20) éĆÜîĆĚîĔßšđĀúĘÖðúĂÖ [email protected] m ÝĆéđøĊ÷ÜđĀúĘÖéĆÜøĎð 20x20 cm 4-DB12 1ð[email protected] C1
ĂĂÖĒïïđÿć (ß Ć Ě î 1) đÿćêĂöŠĂ Grid line B4 øĆïîĞĚćĀîĆÖÝćÖóČĚîßĆĚî 2 ĒðúîóČĚîßĆĚî 2 ĂĂÖĒïïđÿć ß Ć Ě î 1 ĒøÜÖøąìĞćĔîđÿć ßĆĚî 1 ÙĞćîüèÝćÖñúøüöĒøÜðäĉÖĉøĉ÷ć Grid line B Pu = 3,979 ÖÖ. Grid line 4 Pu = 8,050 ÖÖ. îĞĚćĀîĆÖïøøìčÖÝćÖđÿćßĆĚîïî Pu =1,690 ÖÖ. îĞĚćĀîĆÖêĆüđĂÜ 1.4(0.2x0.2x3.2x2,400) =430 ÖÖ. îĞĚćĀîĆÖøüö Pu = 3,979+8,050+1,690+430 = 14,149 ÖÖ. éĆÜîĆĚîĔßšđÿć C1 IPn = 52,773 ÖÖ. > 14,149 ÖÖ. OK 20x20 cm 4-DB12 1ð[email protected] C1
ĂĂÖĒïïđÿć êĂö Š Ă đÿćêĂöŠĂ Grid line B4 øĆïîĞĚćĀîĆÖÝćÖóČĚîßĆĚî 1 ĒðúîóČĚîßĆĚî 1 ĂĂÖĒïïđÿć êĂö Š Ă ĒøÜÖøąìĞćĔîđÿć êĂöĂŠ ÙĞćîüèÝćÖñúøüöĒøÜðäĉÖĉøĉ÷ć ĔîßĆĚî 1 Grid line B Pu = 9,112 ÖÖ. Grid line 4 Pu = 2,771 ÖÖ. îĞĚćĀîĆÖïøøìčÖÝćÖđÿćßĆĚîïî Pu =14,149 ÖÖ. îĞĚćĀîĆÖêĆüđĂÜ 1.4(0.2x0.2x1.5x2,400) =202 ÖÖ. îĞĚćĀîĆÖøüö Pu = 9,112+2,771+14,149+202 = 26,234 ÖÖ.
ĂĂÖĒïïđÿć êĂö Š Ă ĂĂÖĒïïđðŨîđÿćÿĆĚî (đÿćðúĂÖđéĊę÷ü) IPn=I0.80P0 = 0.70x0.80[0.85f’c (Ag - Ast) + fy Ast] Ĕßšđÿć×îćé 20x20 àö. đÿøĉöđĀúĘÖ 6-DB12 A g = 20x20 = 400 cm2 Ast = 6x1.131 =6.79 cm2 IPn = 0.70x0.80x[0.85x240x(400-6.79)+3000x6.79] IPn = 56,327 ÖÖ. > 26,234 ÖÖ. OK ĂĂÖĒïïđÿć êĂö Š Ă ÖĞćĀîé×îćéĒúąøą÷ąđøĊ÷ÜđĀúĘÖðúĂÖ ĔßšđĀúĘÖ÷Čî DB12 ĒúąĔßđĀú š ĘÖðúĂÖ RB6 øą÷ąđøĊ÷ÜđĀúĘÖðúĂÖĕöđÖŠ ĉî Smax = min (16Il , 48Is , éšćîĒÙïÿčé×ĂÜđÿć) = min (16x1.2 , 48x0.6 , 20) = min (19.2, 28.8, 20) éĆÜîĆĚîĔßšđĀúĘÖðúĂÖ [email protected] m ÝĆéđøĊ÷ÜđĀúĘÖéĆÜøĎð 20x20 cm 6-DB12 1ð[email protected] êĂöŠĂ-åćîøćÖ C1
ĂĂÖĒïïåćîøćÖ ĒøÜÖøąìĞćĔîåćîøćÖ grid line B4 PDL = 15,377.5 ÖÖ. PLL = 2,767.9 ÖÖ. Pu = 26,234 ÖÖ. ĀćÝĞćîüîđÿćđ×Ęö ĒøÜÖøąìĞćĔîđÿćđ×ĘöìÿõćüąĔß Ċę šÜćî Ps =PDL+PLL Ps =15,377.5+2767.9 = 18,145.4 êĆî ÿööčêĉîĞĚćĀîĆÖåćîøćÖ 10% = 0.1x18,145.4 = 1814.5 êĆî éĆÜîĆĚîîĞĚćĀîĆÖøüöìĆĚÜĀöé = 18145.4+1814.5 = 19,960 êĆî éĆÜîĆĚîĔßšđÿćđ×Ęö 1 êšî ×îćé 0.22x0.22 øĆïîĞĚćĀîĆÖðúĂéõĆ÷ĕéšĕöîŠ šĂ÷ÖüŠć 20 êĆî/êšî ĂĂÖĒïïåćîøćÖ ðøĉöćèđĀúĘÖđÿøĉö×ĆĚîêĞęć éĆÜîĆĚîĔßšđĀúĘÖ 6-DB12 ìĆĚÜÿĂÜìýìćÜ ĉ ĔßšåćîøćÖ×îćé 0.6x0.6ö. Āîć 0.5 ö. øĂÜøĆïéšü÷đÿćđ×Ęö 0.22x0.22 ö. êšîđéĊ÷üéĆÜøĎð đîČęĂÜÝćÖđðŨîđÿćđ×ĘöêšîđéĊ÷ü -ĕöŠÝĞćđðŨîêšĂÜêøüÝÿĂïĒøÜđÞČĂîìąúč -ĕöŠÝĞćđðŨîêšĂÜêøüÝÿĂïĒøÜđÞČĂîĒïïÙćîÖüšćÜ 2 As min 0.002bt 0.002u 60 u 50 6.0 cm As cm cm OK 2 2 2 1.2 6.79 6.0 4 6 u ! S