thuyết minh tính toán coppha

8/10/2019 Thuyt Minh Tnh Ton Coppha

1/20

Thuyt minh tnh ton coppha2.1.2 Tnh ton vn khun dmTnh vn khun dm c kch thc tit din bxh = 30x60 cm2.1.2.1 Tnh ton vn khun y dm

Vn khun y dm s d!n" vn khun kim #$%i& d'n" cc t(m )300x*+00,-c t./ #n cc th/nh 1 "2 n"/n" c/ h ch4n" y dm )1 n"/n"& 1 d5c& "i$78,9 :h;n" ch2 b< thiu h!t h$c c k> h? th@ d'n" "2 m v1$ A Bm bB$ h@nhd%n" c/ dm Cn" thDi tEnh b< chBy nc xi mFn" #1m Bnh h?n" n ch(t#-n" b tn" dm9

Ta c t hp vn khun dm chnh

Ldn

Mmax

q

Ldn Ldn Ldn Ldn

LdnLdnLdn

S tnh vn khun y dm

TBi tE5n" tc d!n" #n vn khun y dm "Cm cG

STT Tn t!i t"#n$ %n$ th&c n 'tc(da)*m2+ 'tt(da)*m2+

* TBi bBn thHn c4I Ih/ tc +*J 3Kd/: L m= *&* 3K M+9K

+ TBi tE5n" bBn thHnNTOT dm

tc

+ btct dJ h+P00Q0&6

= =

*&+ *P00 *R00

3TBi tE5n" d$ S btn"

bn" cn tE!ctc

3J M00= *&3 M00 P+0

MTBi tE5n" d$ m

btn"tc

MJ +00= *&3 +00 +60


2/20

TSn" tBi tE5n" * + 3 MJ J J J J= + + + 21,- 222/- TSn" tBi tE5n" tnh t$n IhHn b4 tc d!n" #n vn y dm Jtt=)J*UJ+UJ3UJM,Q0&3=+6++&KQ0&3=R6&R d/:Lm+

a. Tnh ton khong cch x g theo iu kin bn:

U WiXu kin bXnG = MW

YQ)d/:Lcm+,9

TE$n" G Z=6&PP cm3[\m]n khn" u4n c/ vn khun& bX E^n" 300mm_

\ ` \ m]n tE$n" vn y dm \ =+Q

*0tt xg q l

*0 9xg

W Rl

q

=

+

*0Q6&PPQ+*00Q0&K*+P&M3

R6&RQ*0cm

=

Vay ch5n kh$Bn" cch "i;/ cc x1 "C n"/n" #1 #x"= 60cm9

b. Tnh ton khong cch x g theo !"ngUTBi tE5n" tiu chun tc d!n" #n vn khun tEn *m d1i

Jtc =R6&R

6PP&3 L*&+

#a$ m=

U W^ vn" c/ vn khun -c tnh th]$ cn" thcG e =MQ

*+RQ Q

tcq l

% &

U W^ vn" ch$ IhfIG [ ]*

QM00

' l=

[ ]

M

*+R 9 M00

tc

g gq l l

' '% & = =

6

33+

*+RQ Q *+RQ+&*Q*0 Q+R&M6*M+&RR

M00Q M00Q6PP&3Q*0g tc% &

l cmq

= =

TE$n" G g ` \ un 1n hCi c/ thfI_ g = +&*9*06 k"Lcm+9 ` \m]n Jun tnh c/ bX E^n" vn khun = +R&M6 cmM

t h-I + iXu kin tEn t/ ch5n #x"= 60 cm

2.1.2.2 Tnh ton vn khun thnh dm` Tnh t$n vn khun th1nh dm th.c ch(t #1 tnh kh$Bn" cch cHy ch4n"

xin c/ th1nh dm& Bm bB$ ch$ vn th1nh khn" b< bin d%n" Ju #n di tcd!n" c/ I #.c b tn" khi m S9

` ju/n nim vn khun th1nh dm #1m vic nh m^t dm #in t!c Xu nh


3/20

#uatt bac nh(t& c "i tE< )nQQhd,9 WA n "iBn tE$n" tnh t$n t/ ch$ I #.c IhHn

b4 Xu tEn t$1n b^ chiXu c/$ th1nh dm9 OhiXu c/$ #1m vic c/ th1nh dm9 h = 0&6 ` 0&*P = 0&MP cm9

:h vay s> -c "hfI t + t(m vn b= +Pcm v1 b=+0cm9

` TBi tE5n" tc d!n" #n vn th1nh dm b/$ "Cm9U oI #.c c/ btn"G

J*=n QQ bdQhdTE$n" G n =*&3 #1 h s4 ^ tin cay

= +P00 d/:Lm3 #1 dun" tE5n" Ein" c/ b tn"

J*= *&3 Q +P00Q 0&3Q 0&6 = PRP d/:LmU oI #.c S btn"G J+= n Q IdQ hd

TE$n" G p s4 ^ tin cayG n =*&3 I #.c S btn" Id= M00 d/:Lm+ J+= *&3 Q M00Q 0&6 =3*+ d/:Lm

TSn" tBi tE5n" IhHn b4 tc d!n" #n vn th1nh dm #1G Jtt= J*U J+= PRP U 3*+ = RK d/:Lm

Ltt

Mmax

Ltt Ltt Ltt

LttLttLttLtt

q

q C tnh vn khun th1nh dma. Tnh ton khong cch n() *ng theo iu kin bn


4/20

` WiXu kin bXnG =M

WYQ d/:Lcm+

TE$n" G Z ` \m]n khn" u4n c/ t(m vn th1nh_Z = M&PU M&3 = R&R cm3

\ ` \m]n tEn vn th1nh dm_ \ =+

Q*0

nq l

*0Q Q Qn#

tt

W Rl

q

=

*0QR&RQ+*00Q0&K*36&

R&Kcm=

b. Tnh ton khong cch n() *ng theo iu kin !"ngUTBi tE5n" tiu chun tc d!n" #n vn khun tEn *m d1iG

Jtc =RK

M&P L*&+

#a$ m=

U W^ vn" c/ vn khun -c tnh th]$ cn" thcG e =

M

Q*+RQ Q

tc

q l% &


QM00

' l=

[ ]M

*+R 9 M00

tc

n# n# q l l' '% &

= =

6

33+

*+RQ Q *+RQ+&*Q*0 Q+R& M6*36&

M00Q M00QM&PQ*0n# tc% &

l cmq

= =

TE$n" G g ` \ un 1n hCi c/ thfI_ g = +&*9*06 k"Lcm+9

` \m]n Jun tnh c/ bX E^n" vn khun = +R&M6 cmM

t h-I + iXu kin tEn t/ ch5n #nd= *+0 cm

2.1.2.3 Tnh ton ngang cho dm

l d

p

M =maxdp. l

4

an ngangan an

q

s t nh t o n ng ang

TBi tE5n" tc d!n" #n 1 n"/n" #1 t$1n b^ tBi tE5n" dm tE$n" din tEuyXn tBi c/n


5/20

)din tEuyXn tBi #1 m^t kh$Bn" /n,9 N/$ "CmGU TBi tE5n" vn khun h/i th1nh dmG J*= +Q)*&*Q3KQ0&MP, = 3R&6* )d/:Lm,

U TE5n" #-n" vn khun y dmG J+= *&*Q3KQ0&3 =*+&R d/:Lm

3K d/:Lm+ ` #1 tBi tE5n" c/ *m+ vn khun dm9

U TE5n" #-n" b tn" c4t thfI dm d1y h =60 cm

J3= nQQhQb =*&+Q+P00Q0&6Q0&3 = PRP d/:Lm

U TBi tE5n" S btn" dmG JM= nQbQdTE$n" G p s4 ^ tin cayG n =*&3

p$%t tBi S btn" bn" cn tE!cG d= M00d/:Lm+

JM= *&3 Q M00Q 0&3 = *P6 d/:Lm

U TBi tE5n" m nfnG JP= nQbQJtc TE$n" G p s4 ^ tin cayG n =*&3

I #.c m nfn tiu chunG Jtc = +00 d/:Lm+

JP= *&3 Q0&3Q +00 = R d/:Lm

U TBi tE5n" thi cn"G J6 = nQbQtc TE$n" G p s4 ^ tin cayG n =*&3

h$%t tBi thi cn" tiu chunG tc= +P0 d/:Lm+ J6= *&3 Q 0&3Q+P0 = K&P d/:Lm

U TBi tE5n" bBn thHn 1 n"/n"G Jn= n QbQhQ "Q8TE$n" G p s4 ^ tin cayG n =*&*

run" tE5n" Ein" c/ "2 "=600 d/:Lm3

b& h #1 chiXu E^n" v1 chiXu c/$ c/ 1 n"/n"9 Oh5n )bh, = )R *0, cm J = *&*Q0&0RQ0&*Q600Q0&6 = 3&+ d/:TBi tE5n" tSn" c^n" tc d!n" #n 1 n"/n"Jtt=)J*UJ+UJ3UJMUJ6, /nUJn=)3R&6*U*+&RUPRPU*P6UK&P,Q0&6U3&+= P3&*K)d/:,TBi tE5n" tc d!n" #n 1 Jui vX #.c taI tEun"G

= JQ #na = P3&*KQ 0&6 = 3++&3* d/:

i tE< m$m]nG m/xQ

M

#+ lM = )d/:9cm,

T/ cG Z =+Q

6

b h=

+R9*0

6= *33&33 cm3

)b h, =)R *0, cm #1 tit din n"/n" c/ 1 n"/n"9


6/20

a. Tnh ton theo iu kin bn

= [ ] [ ]m/x MQ Q QQ Q

QMtt #

#

W nM + ln l

W W +

= = d/:Lcm+

MQ*33&33Q*P0Q0&RP+*0&K

3++&3*#l cm =

b. Tnh ton theo iu kin !"ng:UTBi tE5n" tiu chun tc d!n" #n vn khun

tc =3++&3*

+6R&6*&+

#a$=

U W^ vn" c/ vn khun -c tnh th]$ cn" thcG3

m/x

Q

MRQ

tc#+ l'

%&=


QM00

' l=

[ ]3

m/x

Q MRQ Q

MRQ M00 M00Q

tc

tc

+ l l % &' ' l

%& + = =

P 3MRQ*&*Q*0 QRQ*0*R*

M00Q+6R&6Q*+l cm =

t h-I + iXu kin tEn t/ ch5n # = *+0 cm

=Vay chiXu d1i 1 n"/n" #1 *+0cm& kh$Bn" cch "i;/ cc th/nh 1 n"/n" #160cm92.1.2.4 Tnh ton dc cho dmTBi tE5n" tc d!n" #n 1 d5c )d$ 1 n"/n" tEuyXn xu4n" ,G

dd

3++&3**6*&*6) ,

+ +

#n)) #a$= = =

i tE< m$m]n #n nh(tG \ m/x= 0&*KQddQ N = 0&*KQ*6*&*6Q*&+ = 36&M)d/:9m,` TBi tE5n" bBn thHn 1 d5cG Oh5n )b h, = )6 R,cm

Jbt= 0&06Q 0&0RQ 600Q *&* = 3&* )d/:Lm,

\bt=+ +3&* *&+

0&MP6 9*0 *0

btq l #a$ m

= =


7/20

1200

Mmax

P P P P P P P P P

1200 1200 1200

1200 1200 1200 1200

0nh v 3 S ch4u 56c c7a 8 d#c dm

` / tE< mm]n #n nh(t A tnh 1 d5c th]$ bXnG \m/x= \m/x*U\bt

\m/x= 36&M U 0&MP6 = 3&+ )d/:9m,

+ +

3Q 6QR 6M6 6

b hW cm = = =

U iAm tE/ khB nFn" ch


8/20

2.1., Thit k vn khun 98n

2.1.3.1 Tnh ton vn khun sn


9/20

:!n$ t!i t"#n$ tc d;n$ 5n 98n

STT Tn t!i t"#n$ %n$ th&c n 'tc(da)*cm2+ 'tt(da)*cm2+

* TBi bBn thHn c4I Ih/ tc +*J 3Kk L m= *&* 3K M+9K

+TBi tE5n" bBn thHn

NTOT s1n

tc

+ btct dJ h

+P00Q0&*P

=

=*&+ 3P MP0

3TBi tE5n" d$ S btn"

bn" cn tE!ctc

3J M00= *&3 M00 P+0

MTBi tE5n" d$ m

btn"tc

MJ +00= *&3 +00 +60

PTBi tE5n" d$ d!n" c!

thi cn"tc

PJ +P0= *&3 +P0 3+P

TSn" tBi tE5n" * + 3 M PJ J J J J J= + + + + 12< 1=->/-

S t hp vn khun 98n tn$ i?n hnh

U q1nG q d!n" cc t(m #$%iG 300*R00mm& +00x*+00mm& 300x*+00mm


10/20

U Oh2 n1$ czn h? ch{n thm vn khun "2 d1y +0mm9

` Tnh kh$Bn" cch "i;/ cc 1 n"/n"& 1 d5c | vn khun s1nG

WA thuan tin ch$ vic thi cn"& t/ ch5n kh$Bn" cch "i;/ th/nh 1 n"/n"m/n" vn s1n # = 60cm& kh$Bn" cch #n nh(t "i;/ cc th/nh 1 d5c # =*+0cm

)bn" kch thc c/ "i$ 78,9T kh$Bn" cch ch5n tEc t/ s> ch5n -c kch thc Ih' h-I c/ cc th/nh

19Tnh t$n& kiAm tE/ ^ bXn & ^ vn" c/ vn khun s1n v1 ch5n tit din cc

th/nh 19iAm tE/ ^ bXn& ^ vn" ch$ m^t t(m vn khun s1nG

Ld

Mmax

q

Ld Ld Ld

LdLdLdLd

0nh v3 S ch4u 56c vn khun 98na. Tnh ton theo iu kin bn:

= MW

YQd/:Lcm+9

TE$n" G Z = 6&PPcm3 ` \m]n khn" u4n c/ t(m vn khun E^n" 300

\ ` \m]n tE$n" vn y s1n_ \ =+Q

*0#q -

*0Q Q Q#

tt

W Rl

q

=

*0Q6&PPQ+*00Q0&KRR&0+

*P&KKcm=

b. Tnh ton theo iu kin !"ng

UTBi tE5n" tiu chun tc d!n" #n vn khun tEn *m d1iGJtc= *+6Md/:Lcm+

U W^ vn" c/ vn khun -c tnh th]$ cn" thcG e =MQ

*+RQ Q

tcq l

% &


QM00

' l=


11/20

[ ]M

*+R Q M00

tc

# #q l l

' '% &

= =

6

33+

*+RQ Q *+RQ+&*Q*0 Q+R&M6**M&R

M00Q M00Q*+6MQ*0# tc% &

l cmq

= =

TE$n" G g ` \ un 1n hCi c/ thfI_ g = +&*9*06 k"Lcm+9 ` \m]n Jun tnh c/ bX E^n" vn khun = +R&M6 cmM

/t h0) 1 iu kin t23n ta ch4n l#5 67 cm

2.1.3.2 Tnh ton kim tra thanh ngang

` Oh5n tit din th/nh x1 "C n"/n"G bh = R*0cm& "2 nhm V} cG

"2= *P0 kLcm+v1 g =*&*Q*0PkLcm+9

` TBi tE5n" tc d!n"GU ~1 "C n"/n" ch


12/20

thi cn"

TSn" tBi tE5n" * + 3 M PJ J J J J J= + + + + 12< 1=->/-U TBi tE5n" bBn thHn 1 n"/n"G

J6= n Qb QhQ "TE$n" G

p s4 ^ tin cayG n =*&*

run" tE5n" Ein" c/ "2 "= 600 d/:Lm3

b& h #1 chiXu E^n" v1 chiXu c/$ c/ 1 n"/n"9 Oh5n bxh=Rx*0cm J6= *&*Q0&0RQ0&*Q600 = P&+R d/:Lm=TSn" tBi tE5n" IhHn b4 tc d!n" #n x1 "C #1G Jtt= )J*U J+U J3 UJM U JP,Q#nU J6 Jtt= )M+&KUMP0UP+0U+60U3+P,Q0&6U P&+R = K6M&0+ d/:Lm

= \m/x =+ +Q K&6MQ*+0

*3RR*&6 9*0 *0

tt +8-q , #a$ cm= =

T cn" thc G Z =+Q

6

b h=

+RQ*0

6= *33&33 cm3

= m/x*3RR*&6

*0M&***33&33

tt M

W = = = d/:Lcm+ w = *P0 d/:Lcm+

= Oh5n 1 n"/n" )R *0, #1 Bm bB$ khB nFn" ch


13/20

2.1.3.3 Tnh ton kim tra thanh dc

Oh5n tit din th/nh 1 d5cG ch5n tit din bh = *0*+ cm "2 nhm V} cG

"2 = *P0 d/:cm+v1 g =*&*Q*0Pd/:Lcm+

` TBi tE5n" tc d!n" #n th/nh x1 "C d5cGU ~1 "C d5c ch


14/20

tt= /x +6MRK

**0&3V+M0

mM

W= = d/:Lcm+ w = *P0kLcm+9

Th$B mn yu cu bXn

` iAm tE/ vn"G

U V@ cc tBi tE5n" taI tEun" t "n nh/u cch nh/u 0&6m& nn t/ c thA tnhbin d%n" c/ 1 d5c "n n" th]$ dm #in t!c Xu nh


15/20

%Du tEo vn khun dm/ 98n

2.2 Tnh ton khFi 5Gn$ cn$ tc2.2.1 !h"i #$%ng cng tc &' tng (Tnh ton cho 1 tng in h)nh*

Tn"O(u kin

WVT ch thc )m,

q4#-n"

)ci,

h4i #-n"TSn"

TSn" c^ntn"8$%i hiu *c(u kin T$1n b^

3

O^t

O* m3 093Q09PQ3 ++ 09MP K9K

M09+R*

*P39R0O+ m3 093Q09Q3 +0 0963 *+96

O3 m3 09PQ09PQ3 M 09P 3Ohiu "h m3 +9+KQP9Q09* * *930P3 *930P3V th/n" * m3 +9+KQ393Q09* * 09PP 09PPVch th/n" m3 09+PQR9MRQ3 + 6936 *+9+

rm r* m3 093Q09MRQ90* +M *90* +M9+M 3K90K6r+ m3 09++Q09*RQ3 *+ 09*+ *9MM


16/20

r3 m3 09++Q09+RQ39K M0 09+M K96rM m3 09++Q093RQP9 M 09MR *9K+rP m3 09*PQ09*RQ396 M 09* 09Mr6 m3 09*PQ09*RQP9R*P 3 09*6 09MR

V th/n" + m3 *9PMQ393Q09* + 09P0R+ *90*6M

q1n

* m3 696RQ396Q09*+ *6 +9RK M69+M

M9M+0

+ m3 396RQ+9RQ09*+ *0 *9+3 *+933 m3 M9M6Q396Q09*+ + *9K3 39R6M m3 P96RQP9+Q09*P * M9M3 M9M3P m3 P96RQ396Q09*+ + +9MP M9K6 m3 P9MRQM90K+Q09*+ * +96K +96K

2.2.2 !h"i #$%ng cng tc c"t th+, (Tnh ton cho 1 tng in h)nh*

Tn"O(ukin

hiu

8 Ein"k"Lm3,

8 NT* O )m3,

p1m#-n"),

q4#-n")ci,

h4i #-n")k", TSn")k",

TSn"c^n")T(n*c(u kin T$1n b^

3

O^t

O* RP0 09MP + ++ 096P *PPM93

+M*9

+09+O+ RP0 0963 + +0 KR9K* *KR9+

Ohiun"h

RP0 *930P3 *9P * *P396KK* *P396KK*

V th/n"*

RP0 09PP *9P * RR9KR36R RR9KR36R

O3 RP0 09P + M **9P M*VchTh/n"

RP0 6936 3 + *MK9R +KKP9P6

rm

r* RP0 *9+6 *9R +M *R903R M++9K*+

+*09*

r+ RP0 09+ *9R *+ +R9+6 33K9*+r3 RP0 093M *9R M0 MR90M+ *K+*96RrM RP0 0963 *9R M RK90*K 3P6906rP RP0 09*6 *9R M ++960R K09M3+r6 RP0 09+6 *9R 3 3693R **09+*M

V th/n"+ RP0 09P0R+ *9P + PK9RM0PP **K96R**

q1n * RP0 +9RK * *6 ++69R6P 36+K9RM PRM++ RP0 *9+3 * *0 K69PPP K6P9PP3 RP0 *9K3 * + *P*9P0P 30390*M RP0 M9M3 * * 3M9PP 3M9PPP RP0 +9MP * + *K+93+P 3RM96P


17/20

6 RP0 +96K * * +**9*6P +**9*6P

2.2.3 !h"i #$%ng cng tc vn khun (Tnh ton cho 1 tng in h)nh*

Tn"

O(u kin Wn

v

thuyết minh tính toán coppha

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