:1,61248,0=77,38.
()70, ρ = 25/3 γ f = 1,10,07251,148,0=92,40.
()4.6,0 0,2×0,33,0,20,33251,146,0=43,56.
()8,00,3×0,68-0,30,68251,18,0=44,88.
400×4004,200,40,4251,14,20=18,48.
-
35 |
3-(
g n =1,0/2) γ f = 1,231,01,248,0=172,8.
(10.1)[8]:
S 0=0,7 c e c t μS g =0,7·1,0·1,0·1,0·2,4=1,68/2,
=1,0,,(10.4)[8];
t =1,0,(10.6)[8];
μ =1,0,.10.2[8];
S g =2,412-
.(IV).10.1[8].
:
S = S 0 γ f = 1,68·1,4=2,352 /2,
γ f =1,4.10.12[8].
0,72,352=1,646/2,0,7.10.11[8].
:2,35248,0=112,9,1,64648,0=79,0.
3-( v = 10.0/2) γ f = 1,2310,01,248,0=1728,0, -3(10,01,5)1,248,0=1468,8.
:77,38+797,28+172,8+112,9+1728,0=2888,36,-:77,38+797,28+172,8+79,0+1468,8=2595,26.
γ n =0,95- N =2888,360,95=2743,9;: N l =2595,260,95=2465,5.
. 25.,.6.1.12[3],- γ b 3=0,85. R b =14,50,85=12,325.A400, R sc =350.500.
|
|
36 |
.IV.3.IV l 0 / h = 4200/400=10,5 N l / N =
=2465,5/2743,9=0,898 φ b =0,888 φ sb =0,902. φ ≈(φ b + φ sb)/2=(0,888+0,902)/2=0,895(3.97)[5]:
A s, tot
N - RA
φ b
= =
R sc
2743,9×103
0,895
- 12,325×160000350
= 31222,
A = bh =400400=1600002.
4Ø32A400(A s,tot =32172).
-.
: α s = R sc A s, tot /(R b A)=3503217/(12,325160000)=0,554;:
φ = φ b +2(φ sb − φ b) α s =0,889+2(0,9020,889)0,554=0,916> φ sb =0,902.
φ =φ sb =0,902 -:
N ult = φ (R b A+R sc A s,tot)=0,902(12,325160000+3503217)=2794,4103=2794,4> N= 2746,1,
,. -.5.12[5],:
μ = A s, tot / A 100%=3217/160000100=2,01%>0,4%.
-.5.23[5]5008, sw =450<15 d =1532=480 500 (. 19, ).
N =2743,9.
.25.-
37 |
R b =
=14,5 R bt =1,05. A400,
R s =350.
, γ fm =1,15, N n =N /γ fm = 2743,9/1,15=2386,0.
. 19.: ;
R 0=0,29 = 290/2, d =1,5. - γ mt =20/,
:
A = N n / (R 0 − γ mt d)=2386,0/(290−201,5)=9,182.
a = A =
9,18
=3,03; =3,10,-
s |
h c × b c = 500×500.-: -.
|
|
(.19,)-:
h = - h c + b c + 1
N
= - 500 + 500 + 1
274 6, 1 × 1 0 3
= 467,
0 4 2
R bt
+ p '
4 2 1,05+ 0.286
s |
..10.3.23−10.3.25[3].
() Ø32400-25(10.1)[3]:
l = R s A s
= 350× 804,3
= 1067,1,
0, an
R bond u s
2,625×100,5
A s u s − Ø32;
R bond −,(10.2)[3]: R bond = η 1 η 2 R bt = 2,51,01,05=2,625,
η 1=2,5400500 η 2=1,0-≤32(η 2=0,93640).
(10.3)[3]:
l an
= α l
0, an
A s, cal A s, ef
= 0,75× 1067,13122= 777
3217
,
A s, cal, A s, ef − ,-; α =0,75.
= l an + 50 = 777+50=827.
C-
H = 850, ,
h 1=400 .
- h 0 =85050=800 h 01=40050=350.,-IIIIII.(b =1)
s |
Q b, min =0,5 R btbh 01=0,51,051350=183,7H>Q=143,0,.
II II II.
:
M I = 0,125 p ' (a h)2 a =0,1250,286(3100500)23100=749,2106ͷ;
s c
M II = 0,125 p ' (a a)2 a =0,1250,286(31001400)23100=320,3106H.
s 1
-:
A s I= M I / (0,9 h 0 R s)=749,2106/(0,9800350)=29732;
A s II= M II / (0,9 h 0 1 R s) = 320,3106/(0,9350350)=29052.
-16Ø16A400( s =32172).:
μ I= A s /(a 1 h 0)100=3217/(1400800)100=0,287%;
μ II =A s /(ah 01)100=3217(3100350)100=0,297%, μ min =0,10%.
:
s = (a − 100)/(n − 1) = (3100−100)/(16−1)=200,
n .
.20.
.21,22.
a
=======================================================================================================================
411.IKN(H)KS+S'd.sw()()K-A(2)CK.I ..Imaxb.h()(n.)swaa1 H.h1Smax.IC I::::::::::: I5180310I102.05 2743.940.40 4.32 8.450310140 85.40 229.7316.2003482.45 I
|
|
=====================I------------------------------------------------------------------------------------------------------------------------------------------ I
|
S+S(n.)- ; 頠
d.sw-,;
sw
a ,;
a1 -, ;
H.h1 -,;
-
max ,2;
.-,.
========================================================================================================================
411.IKN(H)KS+S'd.sw()()K-A(2)CPI ..Imaxb.h()(n.)swaa1 H.h1Smax.Iࠠ I102.052743.9 40.40 4.32 8.450 310. 140. 85.40 2. 29.73 16.200 I
I 2743.9 40.40 4.32 8.450 310. 140. 85.40 2. 29.73 16.200 I
------------------------------------------------------------------------------------------------------------------------
BOTHO.
2/3:
N=775;Ng=648;eo=6,0;=4.8;.
. 20. : ;
. 21.
. 22.
43 |