thiết kế cầu qua sông với phương án '' dầm bê tông cốt thép'', chương 21

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Theo quy định của quy trình 22TCN 272-05 (điều 3.6.1.3.1): Đối với các mômen âm giữa các điểm uốn ngược chiều khi chịu tải trọng rải đều trên các nhịp và chỉ đối với phản lực gối giữa thì lấy 90% hiệu ứng của hai xe tải thiết kế có khoảng cách trục bánh trước xe này đến trục bánh sau xe kia là 15000mm tổ hợp 90% hiệu ứng của tải trọng làn thiết kế, khoảng cách giữa các trục 145KN của mỗi xe tải phải lấy bằng 4300mm. Do cầu của ta thiết kế cho 3 làn xe,...

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Nội dung Text: thiết kế cầu qua sông với phương án '' dầm bê tông cốt thép'', chương 21

Chương 21: Ho¹t t¶i xe thiÕt kÕ LL Theo quy ®Þnh cña quy tr×nh 22TCN 272-05 (®iÒu 3.6.1.3.1): §èi víi c¸c m«men ©m gi÷a c¸c ®iÓm uèn ng-îc chiÒu khi chÞu t¶i träng r¶i ®Òu trªn c¸c nhÞp vµ chØ ®èi víi ph¶n lùc gèi gi÷a th× lÊy 90% hiÖu øng cña hai xe t¶i thiÕt kÕ cã kho¶ng c¸ch trôc b¸nh tr-íc xe nµy ®Õn trôc b¸nh sau xe kia lµ 15000mm tæ hîp 90% hiÖu øng cña t¶i träng lµn thiÕt kÕ, kho¶ng c¸ch gi÷a c¸c trôc 145KN cña mçi xe t¶i ph¶i lÊy b»ng 4300mm. Do cÇu cña ta thiÕt kÕ cho 3 lµn xe, kh«ng tÝnh tíi t¶i träng ng-êi nªn ta sÏ xÕp xe cho 3 tr-êng hîp: + 1 lµn lÖch t©m + 2 lµn lÖch t©m + 3 lµn lÖch t©m §Ó tÝnh to¸n ph¶n lùc t¹i gèi ta lÊy kÕt qu¶ trong phÇn tÝnh néi lùc dÇm chñ (cã hÖ sè lµn xe): Lùc t¸c dông lªn trô khi xÕp 3 lµn xe cã gi¸ trÞ b»ng b-íc nh¶y cña biÓu ®å lùc c¾t do ho¹t t¶i t¹i tiÕt diÖn trªn ®Ønh trô P3 (22): PLL = QT – QP = 4081.2 KN Tr-êng hîp 1: Mét lµn xe xÕp lÖch t©m Lµn xe ®-îc ®Æt c¸ch mÐp lan can 600mm ®Ó g©y ra néi lùc lín nhÊt (A.3.6.1.3.1) T¶i träng t¸c dông xuèng trô lµ : PLL = 1.2 x (1/3) x (4081.2/0.85) = 192.06 KN M« men g©y ra theo ph-¬ng ngang cÇu do 1 lµn xe xÕp lÖch t©m: MLL= 192.064 = 768.24 KNm Trong ®ã 1.2 lµ hÖ sè lµn cña 1 lµn xe. 600 400 200 180 60 50 70 2% 2% 300 75 60 Tr-êng hîp 2: Hai lµn xe xÕp lÖch t©m Lµn xe ®-îc ®Æt c¸ch mÐp lan can 600mm ®Ó g©y ra néi lùc lín nhÊt (A.3.6.1.3.1)
4081.2 T¶i träng t¸c dông xuèng trô lµ : PLL = 1 2   320.1KN 3  0.85 M« men g©y ra theo ph-¬ng ngang cÇu do 2 lµn xe xÕp lÖch t©m: MLL= 0.5 x 320.1 x (4+1) = 800.25 KNm Trong ®ã 1.0 lµ hÖ sè lµn cña 2 lµn xe. 100 600 400 200 180 120 180 60 50 70 2% 300 2% 300 75 60 Tr-êng hîp 3: Ba lµn xe xÕp lÖch t©m Lµn xe ®-îc ®Æt c¸ch mÐp lan can 600mm ®Ó g©y ra néi lùc lín nhÊt (A.3.6.1.3.1) T¶i träng t¸c dông xuèng trô lµ : PLL = 4081.2 KN M« men g©y ra theo ph-¬ng ngang cÇu do 3 lµn xe xÕp lÖch t©m: MLL= 4081.2x(4+1- 2)/3 = 4081.2 KNm
200 100 600 400 200 180 120 180 120 180 60 50 70 2% 300 2% 300 75 60 1.1.1.1. T¶i träng h·m xe (BR) Theo ®iÒu 3.6.4 quy tr×nh 22TCN 272-05 : Lùc h·m xe ®-îc truyÒn tõ kÕt cÊu trªn xuèng trô qua gèi ®ì. Tuú theo tõng lo¹i gèi cÇu vµ d¹ng liªn kÕt mµ tØ lÖ truyÒn cña lùc ngang xuèng trô kh¸c nhau. Do c¸c tµi liÖu tra cøu kh«ng cã ghi chÐp vÒ tØ lÖ ¶nh h-ëng cña lùc ngang xuèng trô nªn khi tÝnh to¸n, lÊy tØ lÖ truyÒn b»ng 100%. Lùc h·m ®-îc lÊy b»ng 25% träng l-îng cña c¸c trôc xe t¶i hay xe hai trôc thiÕt kÕ cho mçi lµn ®-îc ®Æt trong tÊt c¶ c¸c lµn thiÕt kÕ ®-îc chÊt t¶i theo ®iÒu 3.6.1.1.1 vµ coi nh- ®i cïng mét chiÒu. C¸c lùc nµy ®-îc coi nh- t¸c dông theo chiÒu n»m ngang c¸ch phÝa trªn mÆt ®-êng 1800mm theo c¶ hai chiÒu däc ®Ó g©y ra hiÖu øng lùc lín nhÊt. TÊt c¶ c¸c lµn thiÕt kÕ ph¶i ®-îc chÊt t¶i ®ång thêi ®èi víi cÇu vµ coi nh- ®i cïng mét chiÒu trong t-¬ng lai. Ph¶i ¸p dông hÖ sè lµn quy ®Þnh trong ®iÒu 3.6.1.1.2.
VÞ trÝ ®Æt lùc h·m xe. VËy gi¸ trÞ cña lùc h·m lµ : qBR= 0.25  (35 + 145 + 145) = 81.25 (KN) Quy ®æi lùc h·m vÒ lùc tËp trung ®Æt c¸ch mÆt ®-êng xe ch¹y 1.8m ta cã : + Khi ho¹t t¶i xe ®i trªn 1 lµn : PBR = 81.25 KN + Khi ho¹t t¶i xe ®i trªn 2 lµn : PBR = 281.25 = 162.5 KN + Khi ho¹t t¶i xe ®i trªn 3 lµn : PBR = 381.25 = 243.75 KN 1.1.1.2. Lùc va tµu (CV) 120 120 20 160 160 1700 cv Htt = +1.4 886 -7.46 400 160 480 160 400 300 10 20 150 150 150 150 -80.56 VÞ trÝ ®Æt lùc va tµu. Theo nhiÖm vô thiÕt kÕ, cÊp ®-êng s«ng lµ cÊp I. Theo quy tr×nh 22TCN 272-05 (®iÒu 3.14) :
Dùa vµo cÊp s«ng ta tra b¶ng 3.14.2-1 ®Ó cã tÊn t¶i träng tÇu thiÕt kÕ. Lo¹i tÇu tù hµnh 2000 DWT. Tra vËn tèc va tÇu thiÕt kÕ theo b¶ng 3.14.3-1, vËn tèc b×nh qu©n n¨m cña dßng ch¶y liÒn kÒ trô ®ang tÝnh to¸n lµ 1.8 m/s (theo tµi liÖu phÇn NCKT). V = 3.3 + Vs = 3.3 + 1.8 = 5.1 m/s Theo 3.14.11.1, ®Ó tÝnh æn ®Þnh tæng thÓ, lùc va thiÕt kÕ ®-îc coi lµ mét lùc tËp trung t¸c dông lªn kÕt cÊu phÇn d-íi ë møc n-íc cao trung b×nh h»ng n¨m. Gi¸ trÞ cña lùc nµy theo ph-¬ng th¼ng gãc víi trô lÊy 100%Ps, víi ph-¬ng ngang cÇu lÊy 50%Ps. Trong ®ã, Ps tÝnh b»ng c«ng thøc : Ps  1.2  10 5 V DWT Trong ®ã : Ps lµ lùc va tÜnh t-¬ng ®-¬ng (N) DWT lµ tÊn t¶i träng cña tµu (Mg) V lµ vËn tèc va tµu (m/s). VËy: Ps  1.2 x10 5 x 5.1 2000  273.7 x10 5 N  27370 kN 1.1.1.3. T¶i träng giã 1.1.1.3.1. T¶i träng giã ngang cÇu t¸c ®éng lªn c«ng tr×nh (WS) Theo ®iÒu 3.8.1.1 quy tr×nh 22TCN 272-05. Tèc ®é giã thiÕt kÕ V ph¶i ®-îc x¸c ®Þnh theo c«ng thøc : V = VB.S Trong ®ã : VB : Tèc ®é giã giËt c¬ b¶n trong 3s víi chu kú xuÊt hiÖn 100 n¨m thÝch hîp víi vïng tÝnh giã t¹i vÞ trÝ cÇu, gi¶ thiÕt vïng tÝnh giã theo TCN2737-1995 lµ cÊp II, tra b¶ng 3.8.1.1-1 cã VB= 45m/s, víi tr¹ng th¸i giíi h¹n c-êng ®é III, VB = 25 m/s S : HÖ sè ®iÒu chØnh víi khu ®Êt chÞu giã vµ ®é cao mÆt cÇu theo quy ®Þnh trong b¶ng 3.8.1.1-2. Víi khu vùc x©y cÇu lµ khu vùc cã mÆt n-íc tho¸ng, cao ®é mÆt cÇu so víi mÆt n-íc lµ 13.46m tra b¶ng cã S = 1.12 VËy VB = 251.12 = 28 m/s T¶i träng giã ®-îc ®Æt t¹i träng t©m diÖn tÝch bÒ mÆt ch¾n giã, tÝnh theo c«ng thøc : PD = 0.0006V2AtCd  1.8At (KN) (3.8.1.2.1-1). Trong ®ã: V = Tèc ®é thiÕt kÕ x¸c ®Þnh theo ph-¬ng tr×nh 3.8.1.1-1 (m/s), ®· tÝnh ë trªn. At = DiÖn tÝch cña kÕt cÊu hay cÊu kiÖn ph¶i tÝnh t¶i träng giã ngang (m2). Trong ®å ¸n, diÖn tÝch tÝnh giã lµ phÇn lan can, hai bªn c¸nh hÉng, diÖn tÝch trô lín nhÊt lé trªn mÆt n-íc. Cd = HÖ sè c¶n, tra theo h×nh 3.8.1.2.1-1 cã tÝnh chiÕt gi¶m cho phÇn kÕt cÊu s-ên nghiªng 14o theo quy ®Þnh cña phÇn chó gi¶i (gi¶m 30%), Cd = 2.2 Cd = 2.20.7 = 1.54 T¶i träng giã lµ c¸c lùc tËp trung, ®-îc tÝnh riªng cho lan can, thµnh bªn hép:
C¸c gi¸ trÞ t¶i träng giã vµ ®iÓm ®Æt. CÊu kiÖn V (m/s) Cd At (m2) ChiÒu cao (m) Gi¸ trÞ lùc (KN) Lan can 28 2.2 82.5 23.35 148.5 DÇm 28 1.54 575 20.2 1035 1.1.1.3.2. T¶i träng giã t¸c dông lªn xe cé (WL) : - Theo quy ®Þnh cña ®iÒu 3.8.1.3 cña quy tr×nh 22TCN 272-05, khi xÐt tæ hîp t¶i träng c-êng ®é III ph¶i xÐt t¶i träng giã t¸c dông lªn c¶ kÕt cÊu vµ xe cé. Ph¶i biÓu thÞ t¶i träng ngang cña giã lªn xe cé b»ng t¶i träng ph©n bè 1.5 KN/m t¸c dông theo h-íng n»m ngang vµ ®Æt ë cao ®é1800mm so víi mÆt ®-êng. VËy ®èi víi trô P6 coi t¶i träng giã t¸c dông lªn xe cé truyÒn xuèng trô sÏ gåm cña mét nöa xe xÕp trªn mçi nhÞp. VËy quy ®æi vÒ t¶i träng tËp trung ®Æt trªn trô P4 c¸ch mÆt ®-êng 1800mm sÏ cã gi¸ trÞ lµ : PWL= 1.5(120 +80)/2= 150 KN 1.1.1.3.3. T¶i träng giã däc cÇu. TÝnh t-¬ng tù nh- t¶i giã ngang cÇu, tuy nhiªn do gi¸ trÞ kh«ng ®¸ng kÓ nªn ta kh«ng tæ hîp nã cïng víi c¸c t¶i träng kh¸c. 1.1.1.4. ¸p lùc n-íc. Quy tr×nh, ®iÒu 3.7, chØ tÝnh lùc ®Èy næi. Lùc ®Èy Asimet tÝnh cho chiÒu cao trô ngËp d-íi n-íc ë møc n-íc thÊp nhÊt. Gi¸ trÞ lÊy ng-îc dÊu víi lùc nÐn do kÕt cÊu trªn g©y ra. Khi tÝnh víi mÆt c¾t ®Ønh bÖ mãng : pWA = V = 11.36x(4.8x3.2+3.14x1.62)x10 = 2658 KN Khi tÝnh víi mÆt c¾t ®¸y bÖ mãng : pWA = 2658 + 1620.5310 = 12498 KN Trong ®ã :  lµ dung träng ®Èy næi. V lµ thÓ tÝch trô ngËp trong n-íc. - ¸p lùc dßng ch¶y theo chiÒu ngang b»ng 0 v× n-íc ch¶y vu«ng gãc víi cÇu. - Theo chiÒu däc : p  5.14  10 4  C D  V 2 Lùc nµy kh¸ nhá nªn bá qua kh«ng tÝnh ®Õn. 1.1.1.5. Lùc ma s¸t (FR) - Lùc do ma s¸t chung gèi cÇu ph¶i ®-îc x¸c ®Þnh trªn c¬ së c¸c gi¸ trÞ cùc ®¹i cña c¸c hÖ sè ma s¸t gi÷a c¸c mÆt tr-ît. Khi thÝch hîp cÇn xÐt ®Õn t¸c ®éng cña ®é Èm vµ kh¶ n¨ng gi¶m phÈm chÊt hoÆc nhiÔm bÈn cña mÆt tr-ît hay xoay ®èi víi hÖ sè ma s¸t. Vµ trong c¸c tæ hîp th× kh«ng thÓ lÊy ®ång thêi t¶i träng h·m vµ lùc ma s¸t mµ ph¶i lÊy gi¸ trÞ lín h¬n, tuy nhiªn ë trô P3 cã ®Æt gèi cè ®Þnh víi gi¶ thiÕt lµ lùc h·m sÏ truyÒn xuèng trô theo tû lÖ 100% nªn trong tÝnh to¸n coi nh- lùc ma s¸t lµ kh«ng kÓ ®Õn.
1.1.1.6. HiÖu øng ®éng ®Êt (EQ). CÇu ®-îc x©y dùng n»m trong vïng ®éng ®Êt I nªn theo quy ®Þnh cña quy tr×nh (®iÒu 4.7.4.1) th× kh«ng cÇn ph©n tÝch vÒ t¶i träng ®éng ®Êt bÊt kÓ tÇm quan träng cña nã. Tuy nhiªn ph¶i tu©n theo c¸c yªu cÇu tèi thiÓu sau: bÒ réng gèi cÇu ph¶i lÊy lín h¬n chuyÓn vÞ cùc ®¹i hoÆc % cña bÒ réng lÊy theo kinh nghiÖm N tÝnh theo ph-¬ng tr×nh:  N  200  0.0017 L  0.0067 H  1  0.000125S 2  Trong ®ã: N: ChiÒu dµi tèi thiÓu ®o vu«ng gãc víi ®-êng trôc cña gèi (mm). L: ChiÒu dµi cña mÆt cÇu ®Õn khe co gi·n l©n cËn (mm). H: ChiÒu cao trung b×nh cña c¸c cét ®ì kÕt cÊu nhÞp cÇu ®Õn khe co gi·n gÇn nhÊt (mm). S: §é chÐo cña gèi ®o ®-îc tõ ®-êng vu«ng gãc víi nhÞp (®é) 1.1.2. LËp c¸c tæ hîp t¶i träng t¸c dông lªn trô + §Ó x¸c ®Þnh gi¸ trÞ néi lùc bÊt lîi nhÊt, ta cÇn xÐt tÊt c¶ c¸c tæ hîp t¶i träng bÊt lîi cã thÓ x¶y ra. Theo quy tr×nh AASHTO ta cã c¸c tæ hîp t¶i träng sau: - Tæ hîp t¶i träng theo tr¹ng th¸i giíi h¹n c-êng ®é I cho hÖ sè t¶i träng th-êng xuyªn lín nhÊt. - Tæ hîp t¶i träng theo tr¹ng th¸i giíi h¹n c-êng ®é Ia cho hÖ sè t¶i träng th-êng xuyªn nhá nhÊt. - Tæ hîp t¶i träng theo tr¹ng th¸i giíi h¹n c-êng ®é V cho hÖ sè t¶i träng th-êng xuyªn lín nhÊt. - Tæ hîp t¶i träng theo tr¹ng th¸i giíi h¹n c-êng ®é Va cho hÖ sè t¶i träng th-êng xuyªn nhá nhÊt. - Tæ hîp t¶i träng theo tr¹ng th¸i giíi h¹n sö dông I. - Tæ hîp t¶i träng ®Æc biÖt II ( Extreme II ) Ta xÐt víi 2 tiÕt diÖn : TiÕt diÖn ch©n trô ngµm vµo bÖ mãng ( TiÕt diÖn I ) TiÕt diÖn ®¸y bÖ mãng ( TiÕt diÖn II ) B¶ng tæng hîp néi lùc t¸c dông lªn tiÕt diÖn I Tr-êng hîp 1 lµn xÕp lÖch t©m N Hd Hn Md Mn MAX KN KN KN KNm KNm DC1 35420 0 DW 2089 DB 1539 LL 2318 0 9272 BR 81.25 2031.25 WS 1183.50 24374.48
WL 135 3375.00 CV 13685 27370 121249.1 242498.2 WA -1160.6 Tr-êng hîp 2 lµn xÕp lÖch t©m N Hd Hn Md Mn MAX KN KN KN KNm KNm DC1 35420 0 DW 2089 DB 1539 LL 3864 0 9210 BR 162.5 4062.5 WS 1183.50 24374.48 WL 135.00 3375 CV 13685 27370.00 121249.1 242498.2 WA -1160.6 Tr-êng hîp 3 lµn xÕp lÖch t©m N Hd Hn Md Mn MAX KN KN KN KNm KNm DC1 35420 0 DW 2089 DB 1539 LL 4926 0 4926 BR 243.75 6093.75 WS 1183.50 24374.48 WL 135.00 3375 CV 13685 27370.00 121249.1 242498.2 WA -1160.6 B¶ng tæng hîp néi lùc t¸c dông lªn tiÕt diÖn II Tr-êng hîp 1 lµn xÕp lÖch t©m MAX N Hd Hn Md Mn
KN KN KN KNm KNm DC1 46940 0 DW 2089 DB 1539 LL 2318 9272 BR 81.25 2275 WS 1183.50 27924.98 WL 135.00 3780.00 CV 11685 23370 138584.1 277168.2 WA -8840.64 Tr-êng hîp 2 lµn xÕp lÖch t©m N Hd Hn Md Mn MAX KN KN KN KNm KNm DC1 46940 0 DW 2089 DB 1539 LL 3864 9210 BR 162.5 4550 WS 1183.50 27924.98 WL 135.00 3780.00 CV 11685 23370 138584.1 277168.2 WA -8840.64 Tr-êng hîp 3 lµn xÕp lÖch t©m N Hd Hn Md Mn MAX KN KN KN KNm KNm DC1 46940 0 DW 2089 DB 1539 LL 4926 4926 BR 243.5 6825 WS 1183.50 27924.98 WL 135.00 3780.00 CV 11685 23370 138584.1 277168.2
WA -8840.64 B¶ng tæng hîp néi lùc trô tiÕt diÖn 1 1 lµn xe xÕp lÖch t©m HÖ Lo¹i Tªn Gi¸ trÞ ®· nh©n hÖ sè Gi sè HS t¶i t¶i N Hx Hy My Mx N Hx Hy TT träng träng (KN) (KN) (KN) (KNm) (KNm) (KN) (KN) (KN) DC1 1.25 44275.0 0.0 0.0 0.0 0.0 DW 1.50 3133.5 0.0 0.0 0.0 0.0 DB 1.25 1923.8 0.0 0.0 0.0 0.0 LL 1.75 4056.5 0.0 0.0 0.0 16226.0 52228.1 142.2 0.0 Max BR 1.75 0.0 142.2 0.0 3554.7 0.0 WS 0.00 0.0 0.0 0.0 0.0 0.0 WL 0.00 0.0 0.0 0.0 0.0 0.0 CV 0.00 0.0 0.0 0.0 0.0 0.0 WA 1.00 -1160.6 0.0 0.0 0.0 0.0 C-êng ®é I DC1 0.90 31878.0 0.0 0.0 0.0 0.0 DW 0.65 1357.9 0.0 0.0 0.0 0.0 DB 0.90 1385.1 0.0 0.0 0.0 0.0 LL 1.75 4056.5 0.0 0.0 0.0 16226.0 37516.8 142.2 0.0 Min BR 1.75 0.0 142.2 0.0 3554.7 0.0 WS 0.00 0.0 0.0 0.0 0.0 0.0 WL 0.00 0.0 0.0 0.0 0.0 0.0 CV 0.00 0.0 0.0 0.0 0.0 0.0 WA 1.00 -1160.6 0.0 0.0 0.0 0.0 DC1 1.25 44275.0 0.0 0.0 0.0 0.0 DW 1.50 3133.5 0.0 0.0 0.0 0.0 DB 1.25 1923.8 0.0 0.0 0.0 0.0 LL 1.35 3129.3 0.0 0.0 0.0 12517.2 51300.9 109.7 527.4 Max BR 1.35 0.0 109.7 0.0 2742.2 0.0 WS 0.40 0.0 0.0 473.4 0.0 9749.8 WL 0.40 0.0 0.0 54.0 0.0 1350.0 CV 0.00 0.0 0.0 0.0 0.0 0.0 WA 1.00 -1160.6 0.0 0.0 0.0 0.0 C-êng ®é III DC1 0.90 31878.0 0.0 0.0 0.0 0.0 Mi n
DW 0.65 1357.9 0.0 0.0 0.0 0.0 DB 0.90 1385.1 0.0 0.0 0.0 0.0 LL 1.35 3129.3 0.0 0.0 0.0 12517.2 36589.6 109.7 527.4 BR 1.35 0.0 109.7 0.0 2742.2 0.0 WS 0.40 0.0 0.0 473.4 0.0 9749.8 WL 0.40 0.0 0.0 54.0 0.0 1350.0 CV 0.00 0.0 0.0 0.0 0.0 0.0 WA 1.00 -1160.6 0.0 0.0 0.0 0.0 DC1 1.25 44275.0 0.0 0.0 0.0 0.0 DW 1.50 3133.5 0.0 0.0 0.0 0.0 DB 1.25 1923.8 0.0 0.0 0.0 0.0 LL 0.50 1159.0 0.0 0.0 0.0 4636.0 49330.6 13725.6 27370 Max BR 0.50 0.0 40.6 0.0 1015.6 0.0 WS 0.00 0.0 0.0 0.0 0.0 0.0 WL 0.00 0.0 0.0 0.0 0.0 0.0 CV 1.00 0.0 13685.0 27370.0 121249.1 242498.2 WA 1.00 -1160.6 0.0 0.0 0.0 0.0 §Æc biÖt DC1 0.90 31878.0 0.0 0.0 0.0 0.0 DW 0.65 1357.9 0.0 0.0 0.0 0.0 DB 0.90 1385.1 0.0 0.0 0.0 0.0 LL 0.50 1159.0 0.0 0.0 0.0 4636.0 34619.3 13725.6 27370 Min BR 0.50 0.0 40.6 0.0 1015.6 0.0 WS 0.00 0.0 0.0 0.0 0.0 0.0 WL 0.00 0.0 0.0 0.0 0.0 0.0 CV 1.00 0.0 13685.0 27370.0 121249.1 242498.2 WA 1.00 -1160.6 0.0 0.0 0.0 0.0 DC1 1.00 35420.0 0.0 0.0 0.0 0.0 DW 1.00 2089.0 0.0 0.0 0.0 0.0 DB 1.00 1539.0 0.0 0.0 0.0 0.0 LL 1.00 2318.0 0.0 0.0 0.0 9272.0 40205.4 81.3 395.6 Max BR 1.00 0.0 81.3 0.0 2031.3 0.0 WS 0.30 0.0 0.0 355.1 0.0 7312.3 WL 0.30 0.0 0.0 40.5 0.0 1012.5 CV 0.00 0.0 0.0 0.0 0.0 0.0 WA 1.00 -1160.6 0.0 0.0 0.0 0.0 Sö dông DC1 1.00 35420.0 0.0 0.0 0.0 0.0 Mi n
DW 1.00 2089.0 0.0 0.0 0.0 0.0 DB 1.00 1539.0 0.0 0.0 0.0 0.0 LL 1.00 2318.0 0.0 0.0 0.0 9272.0 40205.4 81.3 395.6 BR 1.00 0.0 81.3 0.0 2031.3 0.0 WS 0.30 0.0 0.0 355.1 0.0 7312.3 WL 0.30 0.0 0.0 40.5 0.0 1012.5 CV 0.00 0.0 0.0 0.0 0.0 0.0 WA 1.00 -1160.6 0.0 0.0 0.0 0.0 2 lµn xe xÕp lÖch t©m DC1 1.25 44275.0 0.0 0.0 0.0 0.0 DW 1.50 3133.5 0.0 0.0 0.0 0.0 DB 1.25 1923.8 0.0 0.0 0.0 0.0 LL 1.75 6762.0 0.0 0.0 0.0 16117.5 54933.6 284.4 0.0 Max BR 1.75 0.0 284.4 0.0 7109.4 0.0 WS 0.00 0.0 0.0 0.0 0.0 0.0 WL 0.00 0.0 0.0 0.0 0.0 0.0 CV 0.00 0.0 0.0 0.0 0.0 0.0 WA 1.00 -1160.6 0.0 0.0 0.0 0.0 C-êng ®é I DC1 0.90 31878.0 0.0 0.0 0.0 0.0 DW 0.65 1357.9 0.0 0.0 0.0 0.0 DB 0.90 1385.1 0.0 0.0 0.0 0.0 LL 1.75 6762.0 0.0 0.0 0.0 16117.5 40222.3 284.4 0.0 Min BR 1.75 0.0 284.4 0.0 7109.4 0.0 WS 0.00 0.0 0.0 0.0 0.0 0.0 WL 0.00 0.0 0.0 0.0 0.0 0.0 CV 0.00 0.0 0.0 0.0 0.0 0.0 WA 1.00 -1160.6 0.0 0.0 0.0 0.0 DC1 1.25 44275.0 0.0 0.0 0.0 0.0 DW 1.50 3133.5 0.0 0.0 0.0 0.0 DB 1.25 1923.8 0.0 0.0 0.0 0.0 LL 1.35 5216.4 0.0 0.0 0.0 12433.5 53388.0 219.4 527.4 Max BR 1.35 0.0 219.4 0.0 5484.4 0.0 WS 0.40 0.0 0.0 473.4 0.0 9749.8 WL 0.40 0.0 0.0 54.0 0.0 1350.0 CV 0.00 0.0 0.0 0.0 0.0 0.0 WA 1.00 -1160.6 0.0 0.0 0.0 0.0 C-êng ®é III
DC1 0.90 31878.0 0.0 0.0 0.0 0.0 DW 0.65 1357.9 0.0 0.0 0.0 0.0 DB 0.90 1385.1 0.0 0.0 0.0 0.0 LL 1.35 5216.4 0.0 0.0 0.0 12433.5 38676.7 219.4 527.4 Min BR 1.35 0.0 219.4 0.0 5484.4 0.0 WS 0.40 0.0 0.0 473.4 0.0 9749.8 WL 0.40 0.0 0.0 54.0 0.0 1350.0 CV 0.00 0.0 0.0 0.0 0.0 0.0 WA 1.00 -1160.6 0.0 0.0 0.0 0.0 DC1 1.25 44275.0 0.0 0.0 0.0 0.0 DW 1.50 3133.5 0.0 0.0 0.0 0.0 DB 1.25 1923.8 0.0 0.0 0.0 0.0 LL 0.50 1932.0 0.0 0.0 0.0 4605.0 50103.6 13766.3 27370 Max BR 0.50 0.0 81.3 0.0 2031.3 0.0 WS 0.00 0.0 0.0 0.0 0.0 0.0 WL 0.00 0.0 0.0 0.0 0.0 0.0 CV 1.00 0.0 13685.0 27370.0 121249.1 242498.2 WA 1.00 -1160.6 0.0 0.0 0.0 0.0 §Æc biÖt DC1 0.90 31878.0 0.0 0.0 0.0 0.0 DW 0.65 1357.9 0.0 0.0 0.0 0.0 DB 0.90 1385.1 0.0 0.0 0.0 0.0 LL 0.50 1932.0 0.0 0.0 0.0 4605.0 35392.3 13766.3 27370 Min BR 0.50 0.0 81.3 0.0 2031.3 0.0 WS 0.00 0.0 0.0 0.0 0.0 0.0 WL 0.00 0.0 0.0 0.0 0.0 0.0 CV 1.00 0.0 13685.0 27370.0 121249.1 242498.2 WA 1.00 -1160.6 0.0 0.0 0.0 0.0 DC1 1.00 35420.0 0.0 0.0 0.0 0.0 DW 1.00 2089.0 0.0 0.0 0.0 0.0 DB 1.00 1539.0 0.0 0.0 0.0 0.0 LL 1.00 3864.0 0.0 0.0 0.0 9210.0 41751.4 162.5 395.6 Max BR 1.00 0.0 162.5 0.0 4062.5 0.0 WS 0.30 0.0 0.0 355.1 0.0 7312.3 WL 0.30 0.0 0.0 40.5 0.0 1012.5 CV 0.00 0.0 0.0 0.0 0.0 0.0 WA 1.00 -1160.6 0.0 0.0 0.0 0.0 Sö dông
DC1 1.00 35420.0 0.0 0.0 0.0 0.0 DW 1.00 2089.0 0.0 0.0 0.0 0.0 DB 1.00 1539.0 0.0 0.0 0.0 0.0 LL 1.00 3864.0 0.0 0.0 0.0 9210.0 41751.4 162.5 395.6 Min BR 1.00 0.0 162.5 0.0 4062.5 0.0 WS 0.30 0.0 0.0 355.1 0.0 7312.3 WL 0.30 0.0 0.0 40.5 0.0 1012.5 CV 0.00 0.0 0.0 0.0 0.0 0.0 WA 1.00 -1160.6 0.0 0.0 0.0 0.0 3 lµn xe xÕp lÖch t©m DC1 1.25 44275.0 0.0 0.0 0.0 0.0 DW 1.50 3133.5 0.0 0.0 0.0 0.0 DB 1.25 1923.8 0.0 0.0 0.0 0.0 LL 1.75 8620.5 0.0 0.0 0.0 8620.5 56792.1 426.6 0.0 Max BR 1.75 0.0 426.6 0.0 10664.1 0.0 WS 0.00 0.0 0.0 0.0 0.0 0.0 WL 0.00 0.0 0.0 0.0 0.0 0.0 CV 0.00 0.0 0.0 0.0 0.0 0.0 WA 1.00 -1160.6 0.0 0.0 0.0 0.0 C-êng ®é I DC1 0.90 31878.0 0.0 0.0 0.0 0.0 DW 0.65 1357.9 0.0 0.0 0.0 0.0 DB 0.90 1385.1 0.0 0.0 0.0 0.0 LL 1.75 8620.5 0.0 0.0 0.0 8620.5 42080.8 426.6 0.0 Min BR 1.75 0.0 426.6 0.0 10664.1 0.0 WS 0.00 0.0 0.0 0.0 0.0 0.0 WL 0.00 0.0 0.0 0.0 0.0 0.0 CV 0.00 0.0 0.0 0.0 0.0 0.0 WA 1.00 -1160.6 0.0 0.0 0.0 0.0 DC1 1.25 44275.0 0.0 0.0 0.0 0.0 DW 1.50 3133.5 0.0 0.0 0.0 0.0 DB 1.25 1923.8 0.0 0.0 0.0 0.0 LL 1.35 6650.1 0.0 0.0 0.0 6650.1 54821.7 329.1 527.4 Max BR 1.35 0.0 329.1 0.0 8226.6 0.0 WS 0.40 0.0 0.0 473.4 0.0 9749.8 WL 0.40 0.0 0.0 54.0 0.0 1350.0 CV 0.00 0.0 0.0 0.0 0.0 0.0 WA 1.00 -1160.6 0.0 0.0 0.0 0.0
C-êng ®é III DC1 0.90 31878.0 0.0 0.0 0.0 0.0 DW 0.65 1357.9 0.0 0.0 0.0 0.0 DB 0.90 1385.1 0.0 0.0 0.0 0.0 LL 1.35 6650.1 0.0 0.0 0.0 6650.1 40110.4 329.1 527.4 Min BR 1.35 0.0 329.1 0.0 8226.6 0.0 WS 0.40 0.0 0.0 473.4 0.0 9749.8 WL 0.40 0.0 0.0 54.0 0.0 1350.0 CV 0.00 0.0 0.0 0.0 0.0 0.0 WA 1.00 -1160.6 0.0 0.0 0.0 0.0 DC1 1.25 44275.0 0.0 0.0 0.0 0.0 DW 1.50 3133.5 0.0 0.0 0.0 0.0 DB 1.25 1923.8 0.0 0.0 0.0 0.0 LL 0.50 2463.0 0.0 0.0 0.0 2463.0 50634.6 13806.9 27370 Max BR 0.50 0.0 121.9 0.0 3046.9 0.0 WS 0.00 0.0 0.0 0.0 0.0 0.0 WL 0.00 0.0 0.0 0.0 0.0 0.0 CV 1.00 0.0 13685.0 27370.0 121249.1 242498.2 WA 1.00 -1160.6 0.0 0.0 0.0 0.0 §Æc biÖt DC1 0.90 31878.0 0.0 0.0 0.0 0.0 DW 0.65 1357.9 0.0 0.0 0.0 0.0 DB 0.90 1385.1 0.0 0.0 0.0 0.0 LL 0.50 2463.0 0.0 0.0 0.0 2463.0 35923.3 13806.9 27370 Min BR 0.50 0.0 121.9 0.0 3046.9 0.0 WS 0.00 0.0 0.0 0.0 0.0 0.0 WL 0.00 0.0 0.0 0.0 0.0 0.0 CV 1.00 0.0 13685.0 27370.0 121249.1 242498.2 WA 1.00 -1160.6 0.0 0.0 0.0 0.0 DC1 1.00 35420.0 0.0 0.0 0.0 0.0 DW 1.00 2089.0 0.0 0.0 0.0 0.0 DB 1.00 1539.0 0.0 0.0 0.0 0.0 LL 1.00 4926.0 0.0 0.0 0.0 4926.0 42813.4 243.8 395.6 Max BR 1.00 0.0 243.8 0.0 6093.8 0.0 WS 0.30 0.0 0.0 355.1 0.0 7312.3 WL 0.30 0.0 0.0 40.5 0.0 1012.5 CV 0.00 0.0 0.0 0.0 0.0 0.0 WA 1.00 -1160.6 0.0 0.0 0.0 0.0
Sö dông DC1 1.0 35420.0 0.0 0.0 0.0 0.0 DW 1.0 2089.0 0.0 0.0 0.0 0.0 DB 1.0 1539.0 0.0 0.0 0.0 0.0 LL 1.0 4926.0 0.0 0.0 0.0 4926.0 42813.4 243.8 395.6 Min BR 1.0 0.0 243.8 0.0 6093.8 0.0 WS 0.3 0.0 0.0 355.1 0.0 7312.3 WL 0.3 0.0 0.0 40.5 0.0 1012.5 CV 0.0 0.0 0.0 0.0 0.0 0.0 WA 1.0 -1160.6 0.0 0.0 0.0 0.0 B¶ng tæng hîp néi lùc trô tiÕt diÖn 2 1 lµn xe xÕp lÖch t©m HÖ Lo¹i Tªn Gi¸ trÞ ®· nh©n hÖ sè Gi sè HS t¶i t¶i N Hx Hy My Mx N Hx Hy TT träng träng (KN) (KN) (KN) (KNm) (KNm) (KN) (KN) (KN) DC1 1.25 58675.0 0.0 0.0 0.0 0.0 DW 1.50 3133.5 0.0 0.0 0.0 0.0 DB 1.25 1923.8 0.0 0.0 0.0 0.0 LL 1.75 4056.5 0.0 0.0 0.0 16226.0 58948.1 142.2 0.0 Max BR 1.75 0.0 142.2 0.0 3981.3 0.0 WS 0.00 0.0 0.0 0.0 0.0 0.0 WL 0.00 0.0 0.0 0.0 0.0 0.0 CV 0.00 0.0 0.0 0.0 0.0 0.0 WA 1.00 -8840.6 0.0 0.0 0.0 0.0 Cêng ®é I DC1 0.90 42246.0 0.0 0.0 0.0 0.0 DW 0.65 1357.9 0.0 0.0 0.0 0.0 DB 0.90 1385.1 0.0 0.0 0.0 0.0 LL 1.75 4056.5 0.0 0.0 0.0 16226.0 40204.8 142.2 0.0 Min BR 1.75 0.0 142.2 0.0 3981.3 0.0 WS 0.00 0.0 0.0 0.0 0.0 0.0 WL 0.00 0.0 0.0 0.0 0.0 0.0 CV 0.00 0.0 0.0 0.0 0.0 0.0 WA 1.00 -8840.6 0.0 0.0 0.0 0.0 DC1 1.25 58675.0 0.0 0.0 0.0 0.0 Ma x
DW 1.50 3133.5 0.0 0.0 0.0 0.0 DB 1.25 1923.8 0.0 0.0 0.0 0.0 LL 1.35 3129.3 0.0 0.0 0.0 12517.2 58020.9 109.7 527.4 BR 1.35 0.0 109.7 0.0 3071.3 0.0 WS 0.40 0.0 0.0 473.4 0.0 11170.0 WL 0.40 0.0 0.0 54.0 0.0 1512.0 CV 0.00 0.0 0.0 0.0 0.0 0.0 WA 1.00 -8840.6 0.0 0.0 0.0 0.0 C-êng ®é III DC1 0.90 42246.0 0.0 0.0 0.0 0.0 DW 0.65 1357.9 0.0 0.0 0.0 0.0 DB 0.90 1385.1 0.0 0.0 0.0 0.0 LL 1.35 3129.3 0.0 0.0 0.0 12517.2 39277.6 109.7 527.4 Min BR 1.35 0.0 109.7 0.0 3071.3 0.0 WS 0.40 0.0 0.0 473.4 0.0 11170.0 WL 0.40 0.0 0.0 54.0 0.0 1512.0 CV 0.00 0.0 0.0 0.0 0.0 0.0 WA 1.00 -8840.6 0.0 0.0 0.0 0.0 DC1 1.25 58675.0 0.0 0.0 0.0 0.0 DW 1.50 3133.5 0.0 0.0 0.0 0.0 DB 1.25 1923.8 0.0 0.0 0.0 0.0 LL 0.50 1159.0 0.0 0.0 0.0 4636.0 56050.6 11725.6 23370. Max BR 0.50 0.0 40.6 0.0 1137.5 0.0 WS 0.00 0.0 0.0 0.0 0.0 0.0 WL 0.00 0.0 0.0 0.0 0.0 0.0 CV 1.00 0.0 11685.0 23370.0 138584.1 277168.2 WA 1.00 -8840.6 0.0 0.0 0.0 0.0 §Æc biÖt DC1 0.90 42246.0 0.0 0.0 0.0 0.0 DW 0.65 1357.9 0.0 0.0 0.0 0.0 DB 0.90 1385.1 0.0 0.0 0.0 0.0 LL 0.50 1159.0 0.0 0.0 0.0 4636.0 37307.3 11725.6 23370. Min BR 0.50 0.0 40.6 0.0 1137.5 0.0 WS 0.00 0.0 0.0 0.0 0.0 0.0 WL 0.00 0.0 0.0 0.0 0.0 0.0 CV 1.00 0.0 11685.0 23370.0 138584.1 277168.2 WA 1.00 -8840.6 0.0 0.0 0.0 0.0 DC1 1.00 46940.0 0.0 0.0 0.0 0.0 Max DW 1.00 2089.0 0.0 0.0 0.0 0.0
DB 1.00 1539.0 0.0 0.0 0.0 0.0 LL 1.00 2318.0 0.0 0.0 0.0 9272.0 44045.4 81.3 395.6 BR 1.00 0.0 81.3 0.0 2275.0 0.0 WS 0.30 0.0 0.0 355.1 0.0 8377.5 WL 0.30 0.0 0.0 40.5 0.0 1134.0 CV 0.00 0.0 0.0 0.0 0.0 0.0 WA 1.00 -8840.6 0.0 0.0 0.0 0.0 Sö dông DC1 1.00 46940.0 0.0 0.0 0.0 0.0 DW 1.00 2089.0 0.0 0.0 0.0 0.0 DB 1.00 1539.0 0.0 0.0 0.0 0.0 LL 1.00 2318.0 0.0 0.0 0.0 9272.0 44045.4 81.3 395.6 Min BR 1.00 0.0 81.3 0.0 2275.0 0.0 WS 0.30 0.0 0.0 355.1 0.0 8377.5 WL 0.30 0.0 0.0 40.5 0.0 1134.0 CV 0.00 0.0 0.0 0.0 0.0 0.0 WA 1.00 -8840.6 0.0 0.0 0.0 0.0 2 lµn xe xÕp lÖch t©m DC1 1.25 58675.0 0.0 0.0 0.0 0.0 DW 1.50 3133.5 0.0 0.0 0.0 0.0 DB 1.25 1923.8 0.0 0.0 0.0 0.0 LL 1.75 6762.0 0.0 0.0 0.0 16117.5 61653.6 284.4 0.0 Max BR 1.75 0.0 284.4 0.0 7962.5 0.0 WS 0.00 0.0 0.0 0.0 0.0 0.0 WL 0.00 0.0 0.0 0.0 0.0 0.0 CV 0.00 0.0 0.0 0.0 0.0 0.0 WA 1.00 -8840.6 0.0 0.0 0.0 0.0 C-êng ®é I DC1 0.90 42246.0 0.0 0.0 0.0 0.0 DW 0.65 1357.9 0.0 0.0 0.0 0.0 DB 0.90 1385.1 0.0 0.0 0.0 0.0 LL 1.75 6762.0 0.0 0.0 0.0 16117.5 42910.3 284.4 0.0 Min BR 1.75 0.0 284.4 0.0 7962.5 0.0 WS 0.00 0.0 0.0 0.0 0.0 0.0 WL 0.00 0.0 0.0 0.0 0.0 0.0 CV 0.00 0.0 0.0 0.0 0.0 0.0 WA 1.00 -8840.6 0.0 0.0 0.0 0.0 DC1 1.25 58675.0 0.0 0.0 0.0 0.0 Ma x
DW 1.50 3133.5 0.0 0.0 0.0 0.0 DB 1.25 1923.8 0.0 0.0 0.0 0.0 LL 1.35 5216.4 0.0 0.0 0.0 12433.5 60108.0 219.4 527.4 BR 1.35 0.0 219.4 0.0 6142.5 0.0 WS 0.40 0.0 0.0 473.4 0.0 11170.0 WL 0.40 0.0 0.0 54.0 0.0 1512.0 CV 0.00 0.0 0.0 0.0 0.0 0.0 WA 1.00 -8840.6 0.0 0.0 0.0 0.0 C-êng ®é III DC1 0.90 42246.0 0.0 0.0 0.0 0.0 DW 0.65 1357.9 0.0 0.0 0.0 0.0 DB 0.90 1385.1 0.0 0.0 0.0 0.0 LL 1.35 5216.4 0.0 0.0 0.0 12433.5 41364.7 219.4 527.4 Min BR 1.35 0.0 219.4 0.0 6142.5 0.0 WS 0.40 0.0 0.0 473.4 0.0 11170.0 WL 0.40 0.0 0.0 54.0 0.0 1512.0 CV 0.00 0.0 0.0 0.0 0.0 0.0 WA 1.00 -8840.6 0.0 0.0 0.0 0.0 DC1 1.25 58675.0 0.0 0.0 0.0 0.0 DW 1.50 3133.5 0.0 0.0 0.0 0.0 DB 1.25 1923.8 0.0 0.0 0.0 0.0 LL 0.50 1932.0 0.0 0.0 0.0 4605.0 56823.6 11766.3 23370. Max BR 0.50 0.0 81.3 0.0 2275.0 0.0 WS 0.00 0.0 0.0 0.0 0.0 0.0 WL 0.00 0.0 0.0 0.0 0.0 0.0 CV 1.00 0.0 11685.0 23370.0 138584.1 277168.2 WA 1.00 -8840.6 0.0 0.0 0.0 0.0 §Æc biÖt DC1 0.90 42246.0 0.0 0.0 0.0 0.0 DW 0.65 1357.9 0.0 0.0 0.0 0.0 DB 0.90 1385.1 0.0 0.0 0.0 0.0 LL 0.50 1932.0 0.0 0.0 0.0 4605.0 38080.3 11766.3 23370. Min BR 0.50 0.0 81.3 0.0 2275.0 0.0 WS 0.00 0.0 0.0 0.0 0.0 0.0 WL 0.00 0.0 0.0 0.0 0.0 0.0 CV 1.00 0.0 11685.0 23370.0 138584.1 277168.2 WA 1.00 -8840.6 0.0 0.0 0.0 0.0 DC1 1.00 46940.0 0.0 0.0 0.0 0.0 Max DW 1.00 2089.0 0.0 0.0 0.0 0.0
DB 1.00 1539.0 0.0 0.0 0.0 0.0 LL 1.00 3864.0 0.0 0.0 0.0 9210.0 45591.4 162.5 395.6 BR 1.00 0.0 162.5 0.0 4550.0 0.0 WS 0.30 0.0 0.0 355.1 0.0 8377.5 WL 0.30 0.0 0.0 40.5 0.0 1134.0 CV 0.00 0.0 0.0 0.0 0.0 0.0 WA 1.00 -8840.6 0.0 0.0 0.0 0.0 Sö dông DC1 1.00 46940.0 0.0 0.0 0.0 0.0 DW 1.00 2089.0 0.0 0.0 0.0 0.0 DB 1.00 1539.0 0.0 0.0 0.0 0.0 LL 1.00 3864.0 0.0 0.0 0.0 9210.0 45591.4 162.5 395.6 Min BR 1.00 0.0 162.5 0.0 4550.0 0.0 WS 0.30 0.0 0.0 355.1 0.0 8377.5 WL 0.30 0.0 0.0 40.5 0.0 1134.0 CV 0.00 0.0 0.0 0.0 0.0 0.0 WA 1.00 -8840.6 0.0 0.0 0.0 0.0 3 lµn xe xÕp lÖch t©m DC1 1.25 58675.0 0.0 0.0 0.0 0.0 DW 1.50 3133.5 0.0 0.0 0.0 0.0 DB 1.25 1923.8 0.0 0.0 0.0 0.0 LL 1.75 8620.5 0.0 0.0 0.0 8620.5 63512.1 426.6 0.0 Max BR 1.75 0.0 426.6 0.0 11943.8 0.0 WS 0.00 0.0 0.0 0.0 0.0 0.0 WL 0.00 0.0 0.0 0.0 0.0 0.0 CV 0.00 0.0 0.0 0.0 0.0 0.0 WA 1.00 -8840.6 0.0 0.0 0.0 0.0 C-êng ®é I DC1 0.90 42246.0 0.0 0.0 0.0 0.0 DW 0.65 1357.9 0.0 0.0 0.0 0.0 DB 0.90 1385.1 0.0 0.0 0.0 0.0 LL 1.75 8620.5 0.0 0.0 0.0 8620.5 44768.8 426.6 0.0 Min BR 1.75 0.0 426.6 0.0 11943.8 0.0 WS 0.00 0.0 0.0 0.0 0.0 0.0 WL 0.00 0.0 0.0 0.0 0.0 0.0 CV 0.00 0.0 0.0 0.0 0.0 0.0 WA 1.00 -8840.6 0.0 0.0 0.0 0.0 DC1 1.25 58675.0 0.0 0.0 0.0 0.0 Ma x