Chương 2: Tính dầm dọc D1 (trục B) pdf

  !"#$%!& '()*    !"#        !"#$%& '  '( )*  +,-  ,.)  !""#$/& ' 0 '( *  +.-  , $%& ! 1234567894238:7:8;67 1400 4500 4000 4000 4000 4000 3600 3600 4000 4000 '!( )$*+,-!!./-01  '2-!!./-1341(-56- :<=>?42345@>A035BC= ( )     0 +++   +  + ++  , %-     = ÷ = ÷ × = ÷  ÷  ÷      5 44 +#3& <6D?423@>A035BC= ( ) ( ) ( ) .   .  + 0 . ++ ++ .  %-= ÷ = ÷ × = ÷ 5 4 #3& → EFG542345#H+&3  :I4:J423@>A)35#H+&3  :I4:J423@>A,335#H+&3 '2-!!./-1347!689:-#-56-';'<;<=;=> :<=>?42375BC= ( )     ) ,.) . +  +  +  , %-     = ÷ = ÷ × = ÷  ÷  ÷      5 4 ,#3& <6D?4235BC= ( ) ( ) ( ) .   .  ,   + + .  %-= ÷ = ÷ = ÷ 5 4 #3& → EFG54237#H,&3 /0 123'4%'5$6%*67809 10   !"#$%!& '()* <?#-%@ !A5( 8#-16 8B 134 K L:65;478423M3  NL:  658BOLC96=G<P9>  658BOLQ423  658BOBRHQG6423  658BOSTU6423 V>AL: V>AL:C96=G<P9> <C*D 85EF A  s¬ ®å truyÒn t¶i dÇm D1 40001500 1500 150045004000 1500 4000 400040004000 1300 30001400 3500 3500 1500 S12 S5 S1 S11 S6 S2 S6 S2 S6 S2 S6 S2 S7 S4 S7 S4 S6 S6 S2* S2* MÆT B»NG DÇM 40001500 1500 150045004000 1500 4000 400040004000 1300 30001400 3500 3500 1500 S6 S2 S6 S6 S2 S6 S2 S7 S4 S7 S4 S6 S6 S2* S2* S2 S1 S5 D1(250X600) D1(250X600) D1(250X600) D1(250X600) D1(250X600) D1(250X600) D1(250X600) D1(250X600) D1(250X600) D2(200X400) D2(200X400) D2(200X400) D2(200X400) /0 123'4%'5$6%*67809 1   !"#$%!& '()* <?#-%@ !A5( 8 <G !A :;<&=%>?>@A- K1>4231.6=G<P<4BW:4A8XF6=#Y!& '9'6=G<P9>4231.4AQ@<=     Z  ,., Z  0 Z ?   , + -= = =  658BOLQ4231. .   # & #, & + Z + . + ?   .   + - γ = − = − = 1>BRHQG64231.8W6;49G33        . 0.. , Z    <      .  + - γ γ = + = + =  .  . # &. #0 + &. B*  +  C   = + + = + + = +0004[ K1>4231.6=G<P<4BW:4A8XF6=#Y& .  . # & #0 + ,& *'  +  C   = + + = + + = HH<1:  ⇒ \L:654>4231.6=G<P<4A8XF6=89 . . . +000 )), B* *'    C C C= + = + = I>>1: K1>BRHQG642318W6;49G334BW:4AQ@<=         0.. .+ Z    <     .  + - γ γ = + = + = :;<&=D12%E12%F!GA@H-I K L:654>C9'6=G<84234A]3:;      Z  ,., Z   Z ?   , + -= = = ^=GP<L:B_@B_        ++ Z 0 0 +   + -= = = K L:654>C9'6=G<84234A]      Z  ,..Z  +. Z ?   , + -= = = ^=GP<L:B_@B_ ( ) ( )  .  .        +. ,. Z + ?   JC - β β = − + = − + = 6>@   .   , , , β   = = =  ÷    K1>BRHQG642318W6;49G33  #       &)` #  0..&)` . Z    <     .  + - γ γ = + = + = #1:JUS:I3.`& K1>4:JUS6=G<84231#STUT=   ,4[Z3  &  #   & Z #,,0& Z , .+ Z % % % %    , + - γ = = =  ⇒ \L:656=G<814AQ@<= /0 123'4%'5$6%*67809 1.   !"#$%!& '()*      # & . .+ ++ ,. + +  %      − = + + + = + + + = J<K1:4 :;<&=D12%E12%KF!GL@-I K L:654>C9'6=G<84234A]3:;      Z  ,., Z  0 Z ?   , + -= = = ^=GP<L:B_@B_       0 . Z 0 0 +   + -= = = K L:654>C9'+6=G<84234A]  + +   Z  ,..Z  +. Z ?   , + -= = = ^=GP<L:B_@B_ ( ) ( )  .  . + +    .) .) +. ,+ Z + ?   JC - β β = − + = − + = 6>@   . .)  , , , β   = = =  ÷    K1>4:JUS6=G<84231#STUT=   ,4[Z3  &  #   & Z #,#,0 ,&& Z0 ++ Z % % % %    , + - γ = = + = K1>BRHQG642318W6;49G33  #       &` #  0..&` +0 Z    <     .  + - γ γ = + = + = #1:JUS:I3`&  ⇒ \L:656=G<814AQ@<=   .  + # & +0 ++ . ,+ + +  %      − = + + + = + + + = H=1:4 K 1>8XF6=42316=G<P<  658BOLQ42316=G<P<    # & #, & + Z + . + ?   .   + - γ = − = − = 1>C9'P9'+6=G<P<4A8XF6=   +   + +   .   ,. # & # & +.   ? ? C     + = + +   = + =     1  4:JU6=G<L:?C9' 1 + 4:JU6=G<L:?C9'+  ⇒ \L:656=G<814AF6= a K. +.+#.&>K>J1: :;<&=D12%KE12%AF!GL@-I  ⇒ \L:656=G<814AQ@<=  . ,  .   − − = = H=1:4 K1>8XF6=42316=G<P<  . ,  . C C − − = = >K>J1: :;<&=D12%AE12%HF!G@-I K L:654>C9',6=G<84234A]3:; /0 123'4%'5$6%*67809 1.   !"#$%!& '()*  , ,   Z  ,..+Z  ), Z ?   , + -= = = ^=GP<L:B_@B_  , ,    ), ,. Z 0 0 +   + -= = = K L:654>C9')6=G<84234A]  ) )   Z  ,..Z  +. Z ?   , + -= = = ^=GP<L:B_@B_ ( ) ( )  .  . ) )    , , +. ,, Z + ?   JC - β β = − + = − + = 6>@   . ,  .+ , , β   = = =  ÷    ⇒ \L:656=G<814AQ@<=  ,  , ) # & ,. ,, + +    − = + = + = IJ1:4 K 1>8XF6=42316=G<P< 1>C9',P9')6=G<P<4A8XF6=  , ) , , ) )   . )  ,. # &0 # & ,+)   ? ? C     + = + +   = + =      658BOLQ42316=G<P<    # & #, & + Z + . + ?   .   + - γ = − = − =  ⇒ \L:656=G<814AF6= a ,K ,+)+#.&=<I>1: :;<&=D12%HE12%MF!GL@-I ⇒ \L:656=G<814AQ@<=   +  .   − − = = H=1:4 K1>8XF6=42316=G<P<   +  . C C − − = = >K>J1: <"LA :;<&=%>?>@A- K1>4231.6=G<P<4BW:4A8XF6=#Y!& '9'6=G<P9>4231.4AQ@<=     Z  ,,Z  +0 Z ?   , + -= = = 1231.6=G<P<42314AF6= . +0. B*  ( = = 004[ K1>4231.6=G<P<4BW:4A8XF6=#Y& . +0 *'  ( = = 4[  ⇒ \L:654>4231.6=G<P<4A8XF6=89 . . . 00  B* *'    ( ( (= + = + = K<J1: :;<&=D12%E12%F!GA@H-I K L:654>C9'6=G<84234A]3:; /0 123'4%'5$6%*67809 1.   !"#$%!& '()*      Z  ,, Z  , Z ?   , + -= = = ^=GP<L:B_@B_       , 0 Z 0 0 +   + -= = = K L:654>C9'6=G<84234A]      Z  .+. Z  , Z ?   , + -= = = ^=GP<L:B_@B_ ( ) ( )  .  .        , ,, Z + ?   + - β β = − + = − + = 6>@   .   , , , β   = = =  ÷     ⇒ \L:656=G<814AQ@<=      # & 0 ,, + +    − = + = + = HKJ1:4 :;<&=D12%E12%KF!GL@-I K L:654>C9'6=G<84234A]3:;      Z  ,, Z  ,0 Z ?   , + -= = = ^=GP<L:B_@B_       ,0 . Z 0 0 +   + -= = = K L:654>C9'+6=G<84234A]  + +   Z  .+. Z  , Z ?   , + -= = = ^=GP<L:B_@B_ ( ) ( )  .  . + +    .) .) , , Z + ?   JC - β β = − + = − + = 6>@   . .)  , , , β   = = =  ÷     ⇒ \L:656=G<814AQ@<=   .  + # & . , + +    − = + = + = H1:4 K1>C9'P9'+6=G<P<4A8XF6=   +   + +   .   ,# & .+# &    ? ? (     + = + +   = + =     1  4:JU6=G<L:?C9' 1 + 4:JU6=G<L:?C9'+  ⇒ \L:656=G<814AF6=  K. JJ1: :;<&=D12%KE12%AF!GL@-I  ⇒ \L:656=G<814AQ@<=  . ,  .   − − = = H1:4 K1>8XF6=C9''+6=G<P< /0 123'4%'5$6%*67809 1   !"#$%!& '()*  . ,  . C C − − = = JJ1: :;<&=D12%AE12%HF!G@-I K L:654>C9',6=G<84234A]3:;  , ,   Z  .+.+Z  +,0 Z ?   , + -= = = ^=GP<L:B_@B_  , ,    +,0 , Z 0 0 +   + -= = = K L:654>C9')6=G<84234A]  ) )   Z  .+. Z  , Z ?   , + -= = = ^=GP<L:B_@B_ ( ) ( )  .  . ) )    , , , , Z + ?   JC - β β = − + = − + = 6>@   . ,  .+ , , β   = = =  ÷    ⇒ \L:656=G<814AQ@<=  ,  , ) # & , , + +    − = + = + = KJH1:4 K1>C9',P9')6=G<P<4A8XF6=  , ) , , ) )   . )  .+ # &0 # & ,)   ? ? (     + = + +   = + =      ⇒ \L:656=G<814AF6= a ,K <HI1: :;<&=D12%HE12%MF!GL@-I K L:654>C9'6=G<84234A]3:;      Z  ,0, Z  + Z ?   , + -= = = ^=GP<L:B_@B_       + + Z 0 0 +   + -= = = K L:654>C9')6=G<84234A]  + +   Z  .+. Z  , Z ?   , + -= = = ^=GP<L:B_@B_ ( ) ( )  .  . + +    , , , , Z + ?   JC - β β = − + = − + = 6>@   . ,  .+ , , β   = = =  ÷    ⇒ \L:656=G<814AQ@<=   +  + # & + , + +    − = + = + = JJ1:4 /0 123'4%'5$6%*67809 1.,   !"#$%!& '()* K1>C9',P9')6=G<P<4A8XF6=   +   + +   ,   ,0# & .+# & +)   ? ? (     + = + +   = + =      ⇒ \L:656=G<814AF6=  K+ =>HJ1:  9662daN 6860daN 6860daN 5496daN 6860daN 902daN/m 1715daN/m1715daN/m1715daN/m 2048daN/m1362daN/m s¬ ®å tØnh t¶i dÇm D1 1400 4500 4000 4000 4000 4000 3600 3600 4000 4000 840daN 2010daN 4179daN 5670daN 870daN/m 1002daN/m 712daN/m712daN/m 780daN/m s¬ ®å ho¹t t¶i dÇm D1 2010daN LTL:6564231 A5( 8 !@7 -" )" !@7M' !@7'M< !@7<M= !@7=M> !@7>MH  4 #4[Z3& .+ ,0 ) )  ) a 4  #4[& ++  +0+ +0+ ,+ +0+  4 #4[Z3&  )0 ) ) 0)   4  #4[& 0,    ,) +) /0 123'4%'5$6%*67809 1.   !"#$%!& '()* K C_@M;6BROL:65       <'?#- +N- 1X6;6BRO>AL:B@bQUc64dB_6]U>; P9QUTIe='!P):f=@M>33gP9:f=@M8XhBC=  !"#$%  &'(()#% /0 123'4%'5$6%*67809 1.+   !"#$%!& '()* = !OP*5-!Q7 = !!Q71(- *NOP6,Q%+R-12%* R"L 134 S@5 4 T U )" C K0). ++ !@7' C K0). 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[...]... R = 0.612* 280 100 = 2.5% s Bố trí thép cho tiết diện 2Ø20 +4Ø25 ⇒As chọn = 25.918 cm2 Tính toán tương tự ta thành lập bảng tính cốt thép dọc như sau: Bảng tính toán cốt thép dọc dầm D1 2.5.2 Tính cốt thép ngang 2.5.2.1 Tính cốt đai: Đề Tài: Trụ Sở Các Cơ Quan Thuộc Bộ KH& ĐT Tại Đà Nẵng Trang 39 Thuyết Minh Đồ Án Tốt Nghiệp KSXD Khóa 2007-2011 SVTH: Lê Văn Quốc - Lớp:TCPY07B1... trí đai φ6 hai nhánh với khoảng cách s=300mm **/Tính toán tương tự ta thành lập bảng tính cốt thép đai như sau: 2.5.2.2 Tính toán cốt ngang tại vị trí có lực tập trung */ Kiểm tra tại vị trí giữa nhịp 6-7: P=6860 daN Tiết diện dầm chính bxh = 25x60 Tiết diện dầm phụ bxh = 20x40 Điều kiện kiểm tra: F (1 − hs ) ≤ ∑ Rsw Asw h0 Trong đó: F=P+G= 6860+5670 =12530 (daN): Lực giật đứt hs... đai theo cấu tạo: Đoạn gần gối tựa: h ≤ 450 thì sct ≤ min(h/2, 150) h > 450 thì sct ≤ min(h/3, 300) Đoạn giữa nhịp lực Q bé có thể không cần tính cốt đai h > 300 thì sct ≤ min(3h/4, 500) Với dầm tính toán có h =600 Chọn được bước đai s Chọn a = 3 cm ⇒ h0 =60-3=57 cm - Giả thiết chọn cốt đai Φ6, n=2, Rsw=175 MPa - Tính khoảng cách cốt đai lơn nhất ϕ (1 + ϕn ) Rbt bh02 1.5 × (1 + 0) × 9... tông nặng và bê tông hạt nhỏ β =0.01) Qbt = 0.3 × 1.07 × 0.885 ×115 × 25 × 57 = 46554 daN Thoả mãn điều kiện: Qmax = 22020 daN < Qbt = 46554 daN Bêtông đủ khả năng chịu ứng suất nén chính của bụng dầm  Khả năng chịu cắt của cốt đai và bê tông: Qwb = 2 × ϕb 2 × Rbt × b × h02 × qsw = 2 × 2 × 9 × 25 × 57 2 × 99.05 = 24067 daN Đề Tài: Trụ Sở Các Cơ Quan Thuộc Bộ KH& ĐT Tại Đà Nẵng Trang... 115×285×10×(55 – 0.5×10) = 16387500 daN.cm = 163.875(T.m) Ta có Mmax = 36.4 T.m ⇒ Mmax < Mf Vậy trục trung hòa qua cánh , tính toán như đối với tiết diện hình chữ nhật với b=bf Trình tự tính toán cốt thép dọc như sau: Tính αm : M 3640000 = 0.04 αm = R b h 2 = 115 × 285 × 552 b f o Kiểm tra αm < αR =0.429 ζ = 0.5x( 1+ 1 − 2α m ) hoặc tra TCVN 356 -2005 phụ lục E1 trang 167 qui định ζ = 0.5x( 1+ 1 − 2 ×... =1750 x 8 x 0.283 x 2 = 7924 daN (1) Và F (1 − hs ) =12530 x (1-17/57) = 8793 daN h0 (2) So sánh giữa (1) và (2) không thoả mãn điều kiện Vậy cốt đai không đảm bảo chịu lực cắt tại vị trí giật đứt Ta tính cốt treo dạng vai bo hs ) 2 hs h0 8793 0 F (1 − ) ≤ 2 × As × Rs × sin 45 ⇒ As ≥ = = 2.76 cm h0 2 × Rs × sin 450 2 × 2250 × sin 450 F (1 − Chọn 2φ16, As= 4.02 cm2 */ Kiểm tra tại vị trí giữa nhịp . 1500 S6 S2 S6 S6 S2 S6 S2 S7 S4 S7 S4 S6 S6 S2* S2* S2 S1 S5 D1( 250X600) D1( 250X600) D1( 250X600) D1( 250X600) D1( 250X600) D1( 250X600) D1( 250X600) D1( 250X600) D1( 250X600) D2(200X400) D2(200X400) D2(200X400) D2(200X400) /0. 6860daN 902daN/m 1715daN/m1715daN/m1715daN/m 2048daN/m1362daN/m s¬ ®å tØnh t¶i dÇm D1 1400 4500 4000 4000 4000 4000 3600 3600 4000 4000 840daN 2010daN 4179daN 5670daN 870daN/m 1002daN/m 712daN/m712daN/m 780daN/m s¬ ®å ho¹t t¶i dÇm D1 2010daN LTL:6564231 A5(. 658BOSTU6423 V>AL: V>AL:C96=G<P9> <C*D 85EF A  s¬ ®å truyÒn t¶i dÇm D1 40001500 1500 150045004000 1500 4000 400040004000 1300 30001400 3500 3500 1500 S12 S5 S1 S11 S6 S2 S6 S2 S6 S2 S6 S2 S7 S4 S7 S4 S6 S6 S2* S2* MÆT