tieu luans co ket cau nang cao

7/24/2019 Tieu luans Co ket cau nang cao

1/45

Tiu lun:C kt cu nng cao GVHD: PGS.TS. Bi Cng Thnh

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C kt cu nng cao l !"t !n h#c t$ang %& 'cung c( cho h#c )i*n cao h#c c+c

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nh7ng kin th8c c %9n ) c+c (hng (h+( (hn t;ch kt cu ngoi !ii ? l@

thu-t Ao' =>ng thi ch $a )i*"c +( 0ng l@ thu-t t$*n )o )i*"c t;nh to+n thit k cng

t$6nh ng thanh' t! (hEng hoF"c t! ch&u un.

ua !n h#c n- I! ) c+c h#c )i*n =J =Kc t$ang %& c+c kin th8c )< c9 hai

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=Kc $Y hn kh9 nFng ch&u t9i th/c cZa )"t li*"u ) kt cu tL =[ %it c+ch \ 0ng tt

hn c+c h*" an ton khi thit k kt cu = =9! %9o t;nh %


2/45


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A/. L THUYT:1/. Tiu chun chy do l g? Thit lp cng thc tiu chun chy do Von Miss cho !ito"n t#$ ch% nht ch&u u'n. (i)n lun

*/. +,y t-nh !y c"ch phn tch ng 0 2n do c34 h) th4nh dn 5 !i to"n 6 th4nh.

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Qch thBS SS *S SS

C/. BI TON TM CHU UN:_"c 2&nh ti t-Lng gi


3/45


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rEs1> s*> s6> H1> H*> . . . G S E1.6G


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5/45


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6/45


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+nh .15 ng su#t t-n $Ft phwng 1 6 *> E SG =

..d Ti*u chun T$Xca ? St VXnant

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7/45


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9/45


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t-Lng gi


10/45


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11/45


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12/45


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18/45


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19/45


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20/45


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23/45


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24/45


V

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g

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(iNu 2: $o$n

V nt 2, hnh thnh Hh


25/45


Bc R@ F! hu34n v) v ni *+c 8c phMng 7i *$n DE1@SK *%n. t#ch *U3cL6 chu34n v) v ni *+c 8c 9c )nh

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26/45


(iNu 2: $o$n5

vD lo

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[ ]

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* 6 S

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=

M4 t-n 2D cng5

M4 t-n 2D cng ph[n t 15 E]1*>^$G

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1

6 *1 1

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27/45


M4 t-n 2D cng c34 ph[n t * Y cK $Dt Hh

S$G

[ ]

6 * 6

* * *

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6 6

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M4 t-n 2D cng c34 ph[n t 6 Y cK * Hh

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d S

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28/45


[ ] [ ]1 1S

E G E G E GH

i i

Tn nT

T

H i iXi i

UP U f 5 5 U 5 5

5= =

= + +

P @h[n t 15

{ }1

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S

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1

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P @h[n t *5

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29/45



{ } 3 f P =

{ }

1 * 6 T V {

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g 3 f =

P @h[n t 15

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30/45


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31/45


V

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32/45


*

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33/45


od chBCng t-nh E0$ ph[n ph8 l8cG5


T$ang dd


34/45


Qt Ou5P Hh


35/45


T

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36/45


C/. BI TON TM CHU UN: (;IIIP_&$. T)'56 178 #` t4 cK5

R$ p f$$

E G

P. H$

f$.$

= ($.g&

_Xt cn !Ang $o$n Ou4nh t-8c 2i Ou4 t-Lng t$ phn t' 24ng 0Xt 77ung gKc 7


37/45


E GE GE GE G S

* *$ $ $

H$. .$ H .H $ .$ . .$ $. . $ .$ . .$.

+ ++ + + + + =

t gLn 7 ! Ou4 c"c 7 cjng !X !c c4o 7 -t gLn> t4 cK5E G$. $ .$ H$.$ = +

E G$. $ H$.$ = + ($.$&

Wu s d8ng c"c !in Hhng th nguyn*

> > >$$( ( (

$ fa$ ( ! !

a

= = = = th

phBCng t-nh E.1.*G cK thN !iNu diqn dB


38/45


ku+ )lK9l+2 )c#

~Li $u&

> u&

l[n lBIt l thnh ph[n chuyNn 7& tho phBCng -> .cos sin$u u ) = +& & & sin cos-u u ) = +& & &

($.P&

cos5 $ = > sin- $ = > * *5 -+($.Q&

Tho gi thit Qi-chorrP]o7 t4 cK5v

u 5

=

&

& >v

) -

=

&

&

($.hg&Zo h) 2'i 0ng nn t4 cK5

$$u

$

=

&

& >u

$

=&

& > S$ =&

($.h$&Th E1.6^G> E1.6G> E1.SG 7o E1.1G t4 cK5

** *

*

E cos sin Gcos sin

cos sin

cos sin

$$

u u ) v vt t

$ $ $ 5 -

v $ v $ t t$ $ 5 $ -

v v vt t t

$ $ $ $

+ = = =

=

= =

& & & & &&

& &

& & &


T$ang dw

Mr

(0, Mp)

(0,-M

p)

(Mp,0

)

(-Mp,0)

(Mp,

Mp)

Hnh 1.12.Tie! "h!#$% '% Mie "h' #*r'% "h! !'*%

M


39/45


* *

cos sin 1cos sin

1cos sin

1cos sin

u u ) v vt t

$ $ $ 5 -

v $ v $ t t

$ $ 5 $ -

v v t vt t

$ $ $ $ $

+ = = =

=

= =

& & & & &&

& &

& & &

*

*$

vt

$

=

&& >

t v

$ $

=

&

&

($.h%&vFt5

*

*$v

$

= && >

1 v

$ $

=

&& S$ =

& l c"c 2D cong

($.h&

*$ $h = && > *h =&

&

Nm+2 1en+2 6'u 6?+ 0 6+ \6 K`+ ! 'E+ 6#)./ *

/ *

E G

h

$ $ $ $

h

D .t

= + = + & && & &

($.hi&

E G

*

(

$ $

D ! !

h

= +& & &

($.h_&Tho 2&nh lut chy do ph'i hIp tiu chun 7on Miss f E1.6{G t4 cK5

E* G$ $$

u! !

!

= =

& && >

E* P G$u

! !!

= =& && ($.hj&

*

6

$

$!

+

=

& &

& >

*

6

$

!

+

=

& &

&

($.hP&Th E1.^G 7o E1.6{G t4 2BIc5

* *1

6 $ $ = + +

& & & &

vFt * *$ $! ! ! ! = +

($.hQ&


T$ang dy


40/45


T4 cK5 E G E G* *

( ( (

$ $ $$

D ! ! ! !

h h ! ! h

= + = + =

& && & &

($.ig&

Qhi chy do 1 nn5

* * * **

6 6

( (

$ $ $ $

D h = + + = + +

& && &&& & &

($.i$&Nm+2 1en+2 6'u 6?+ 0 6+ 60"+ >\ 'E+ 6#)

* **

6

(

$ $

x D.z .z

h = = + + & && && &

$.$.$. B'E+ 1u7+

ung 5 M Mp M- S

ung 5 M- Mp M S

ung 5 Mp M- Mp/* S MPMp/* PM-

ung ~5 Mp/* M- S PM- PMp/* M

ung ~5 S M- PMp M

ung Q5 S M M- PMp


T$ang b

Hnh 1.13.Ti.! "h!% '% Mie "h' r%"h! !%

Mr

/

Mp

M

45'45' M

p/Mp

Mp

-Mp

1

C

2

3

6

7

8

L

-Mp/

-Mp/

Mp/

(r,

)


41/45


ung Q]5 Mp/* M S PM Mp/* M- PMp

ung ]5 Mp M Mp/* S M- PMp/* PM

ung (Z5 $ S> S

ung Z+5 $ S> S

ung +z5 $ S> Sung z(5 $ S> S

viN$ 5 M- S> M Mp $ S>

S> $ P1/*

viN$ (5 M- Mp/ 6 > M */ 6 Mp $ S> S

viN$ 5 M- Mp> M Mp $ S>

S> $

viN$ Z5 M- */ 6 Mp> M Mp/ 6 $ S> S

viN$ 5 M- Mp> M S $ S>

S> $ P*

viN$ 5 M- Mp/ 6 > M PMp/ 6 $ S> S> $ P

viN$ ~5 M- S> M PMp $S> S> $

P1/*

viN$ +5 M- PMp/ 6 > M P*/ 6 Mp $ S> SviN$ 5 M- PMp> M PMp $ S>

S> $

viN$ z5 M- P*/ 6 Mp> M PMp/ 6 $ S> S

viN$ 5 M- PMp> M S $

S> S> $ P*

viN$ ]5 M- PMp/ 6 > M bMp/ 6 $ S> S> $ P

N)7+ FG6

P Wu chx 0Xt n4 t-n 7 n4 dB


42/45


P Whn t-n Ehnh 1.G> t4 th#y s` chy do 7n cK thN chB4 0y -4 Hhi5 Mp M- */6 MphoFc Mp M */ 6 MpE7jng (> Z> ~+> zQG. V th Hhi tnh to"n 7Ci

tiu chun Von Miss t4 cK thN chLn t-Bng ng su#t $ M - hoFc M !Ang */ 6 Mp.

P ;` chy do 7n cK thN 0y -4 Hhi M - M Mp/ 6 MpE2iN$ ]> G.

P ' !W' 6@ 6S+ #)u u+ >'+ 1" 2' 6] 0 ()3+) $.$g& :

b Thng thBng MM- S t-Bng ng su#t Ht hIp ny s ft-n cung .

b T=i t$ - S> cK thN chLn M - Mp> MMp t=i - 4 cK thN chLnM- S> M*/ 6 Mp.

P ' !W' 6@ 6S+ #)u u+ >'+ 1" +2":

b Thng thBng MM- t-Bng ng su#t Ht hIp ny s f t-ncung

b T=i t$ - S> cK thN chLn M- Mp> M*Mp t=i - 4 cK thN chLnM-*/ 6 Mp> MMp.

%. 8 R+2 !"0 >"' 60?+ 6@ 6S+ #)u u+ #)u 6,' 6c+2 8)+ > +)e )3+) %g:


T$ang

M

Mr

Hnh 1.14.Mr, M

r% "h! !%, 9i.%

:;


43/45


! !4 4

O

oHnh 2V!T! t$n ng! %i*n ch&u t9i t$#ng (hn % =


44/45


***1 1

* *

P$ f$ $

% = =

*1E G*$

$ $ f$

$ = + = +

p d8ng 2iau Hi)n !in t=i -S> t4 cK5

* *

*{ {$f$ P $

% = =

q)' s >:

@hBCng t-nh cn !Ang5*

P$

=

E G*

$

. P$ $H

.$

= + =

*$P

$ $ $ C

= +

T-ong 2K l hAng s' Ht hIp 2BIc 0"c 2&nh !fi 2iau Hi)n lin t8c c34 $ > t=i-!5

*

* { {( ($ %P % P

% =

= =

{($ %P C

%=

= +

6

P%C

=

MFt Hh"c> 2iau Hi)n !in t=i -4 l S$ = .

S* 6(P P%

a a

+ = 1 6

1^P PP f

= =

Tho phBCng ph"p cn t-n 5MDt c"ch t-`c Ou4n t4 cK thN chLn cC c#u ph" hu} nhB hnh 21. vy l !i to"n ch&u tit-Lng 2'i 0ng. Qhi cC c#u 2=t chy do t=i $Xp 7 t$ c34 t#$ t-9n th c"c ng su#t lcny tBCng ng 7


45/45


viau Hi)n !in cho t#$ t-9n !& ng$ t-n !in 5T=i 4 *.^$> 1 * Sv C | C = + =&

T=i S> t4 cK Sv v=&

Vy t4 cK * SC = & S1 *.^v

C = &

Vy t4 cK5S E1 G*.^

|v v= & & E{G

Z`4 7o ESG5.

S1 1

*.^

vv

| | |

= =

& E{{G

ng c34 nDi l`c5*.^ *.^

SS

S S

* * *

*.^6 6 6P

P P

vx z || v

| = = =

&&& & E{|G

ng su#t ngo=i tho E{1G5

1.*S S

S

6{E1 G**.^ 6I z|x fvz fv || fv = = = & & & E{^G

n !Ang cng su#t nDi 7 cng su#t ngo=i 5

& & * 6

*.*1^6

P Pf + = E{G

NHtN vT:Qhi tnh cn t-n djng tiu chun 7on Miss t4 th#y Ht Ou ti t-Lng gi

tieu luans co ket cau nang cao

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