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YOG'OCH, UNING YONG'INDAN XAVFI, YONG'INDAN HIMOYA QILISH
USULLARI VA SAMARADORLIGINI BAHOLASH
Siddiqova Madinabonu
SamDAQU magistranti.
https://doi.org/10.5281/zenodo.12684350
Kirish.
Yog'och sellyuloza, yuqori molekulyar og'irlikdagi uglevod (C
6
H
10
O
5
) n va eng
keng tarqalgan tabiiy polimer bo'lib, ular bir-biriga bog'langan.
Yog'och inshootlarning yong'inga chidamliligining haqiqiy chegarasi quyidagi formula
bilan belgilanadi:
P
f
=
0
+
sr
0
- bu o'tin zarbasi boshlangandan boshlab, uning yonishigacha bo'lgan vaqt, -0 4 minut
sifatida qabul qilinadi. namlik bo'lgan yog'och uchun W = 12%;
sr
- o'tin yoqilishi boshlanishidan cheklash holatining boshlanishigacha bo'lgan vaqt.
Qaerda:
V - Yog'ochni yoqish tezligi (2.1-jadval);
Z
c
r
- bu yog'ochni maydalashning kritik chuqurligi, unga erishilganda strukturaning
yong'inga chidamliligi bo'yicha cheklangan holati yuzaga keladi; (
) koeffitsient qiymatini (
h/b
)
va (
Z
cr
/h)
parametrlari bilan bog'lab, grafikalar (2.3-bet [2]) yordamida aniqlanadi.
Eng kichik qism hajmi, mm
Yog'ochni charchash darajasi, mm / min
yopishtirilgan
butun
120 va undan ko'p
120 dan kam
0,6
0,7
0,8
1,0
Z
c
r
ni hisoblash uchun yong'in paytida yog'och inshoot a'zosining chegaralanadigan holatini
aniqlaydigan tenglik qo'llaniladi:
f
=
R
f
Yong'indagi
f
kuchlanish strukturaning geometrik xarakteristikalari (A, W, J, i)
o'zgarishiga bog'liq.
Geometrik xarakteristikalardagi bu o'zgarishlar
koeffitsienti orqali ifodalanadi, uning
qiymatlari quyidagi shaklda keltirilgan: uning qiymatlari quyidagicha ifodalanadi:
A
=
A
f
/A
,
W
,
V
Z
cr
cr
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=
W
f
/W
,
J
=
J
f
/J
,
i
=
i
f
/i
, qaerda
A
f
, W
f
,
J
f
,
i
f
agar - yong'in paytida kesmaning geometrik
xususiyatlari.
=f(h/b,Z
cr
/h)
koeffitsientining A va W, J geometrik xarakteristikalariga bog'liqligi
uch va to'rt tomonlama isitish bilan (2.3-bet [3]).
Grafalardagi egri chiziqlar chizig'i nuqta bilan cheklangan. Agar
, h/b
и
Z
cr
/h
parametrlarining kesishish nuqtalari chiziqli nuqta chizig'idan past bo'lsa,
Z
cr
qiymati 0,25 ∙ b deb
qabul qilinadi.
Egilgan yog'och yong'inga yonish chidamliligini hisoblash.
Yong’inning haqiqiy yong'inga chidamliligi uchta dizayn shartlaridan hisoblangan
minimal Z
cr
qiymatidan aniqlanadi.
Birinchi shart - normal stresslar paytida kuchni yo'qotish:
,
fw
n
w
R
W
M
Qaerda:
R
fw
- yog'ochning egilishga qarshiligi (2.2-jadval), MPa;
W - to'rtburchaklar kesim uchun qarshilik momenti, m3, quyidagi formula bilan aniqlanadi:
,
6
2
h
b
W
Mn – yong’inning o'rtasidagi egilish momenti, кН∙м, standart yuk ta'siridan kelib chiqadi:
.
8
2
l
q
M
n
n
Ikkinchi shart - siljish stresslariga nisbatan kuchni yo'qotish:
,
5
,
1
fqs
A
R
A
Q
Qaerda:
R
fqs
- yog'ochning parchalanishiga yong’inga qarshilik (2.2-jadval), MPa;
A - tasavvurlar maydoni, m2;
Q
- transvers kuch, kN, uning qiymati standart yukdan quyidagi formula bilan aniqlanadi:
.
2
l
q
Q
n
Uchinchi shart - bu egilgan inshootlarning barqarorligini yo'qotish. Yog'ochni charchash
chuqurligiga emas, balki bog'lovchi elementlarning pinli ulanishlarining buzilish ehtimoliga ham
bog'liq.
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Yong'in sharoitida elementlarning barcha pinli ulanishlari bir vaqtning o'zida ishlamay
qoladi deb hisoblasak, unda yassi shaklning (deformatsiyaning) barqarorligini yo'qotish uchun
yong'inga chidamlilik chegarasi metall ulanishlarning yuk ko'tarish qobiliyatini yo'qotishiga teng
bo'ladi, ya'ni. 15 daqiqa. Buni o'rnatishning iloji yo'qligi sababli (barcha dastgoh ulanishlari
muvaffaqiyatsiz bo'ladimi yoki yo'qmi), ta'lim maqsadida, tinglovchiga darslik dizayni
topshirig'ida ulanishlar qulab tushgan lpf nurining uzunligi berilgan. Amalda, bu uzunlik, berilgan
yog'och nur ostida xonadagi yong'in yukining joylashishiga qarab o'rnatilishi mumkin.
Egilgan yog'och elementlarning yong'inga chidamliligini barqarorlik holatidan hisoblash
ketma-ketligi
1.
Z
1
, Z
2
,…, Z
i
qiymatlari bilan o'rnatiladi, chuqurligi
Z
cr 1…i
0,25b
; shartiga muvofiq 3
dan kam emas;
2. 2. Belgilangan
Z
1…i
/ h
и
h / b;
3. Grafik jihatdan
w1 …
wi
4. Yog'ochni
)
(
...
1
i
fw
fw
uch yoki to'rt tomondan qirg'in qilish natijasida nurlanish
oralig'idagi kesmaning o'lchamlari o'zgarishini hisobga olgan holda koeffitsientlarning qiymatlari
quyidagi formula bilan aniqlanadi:
i
i
i
fжж
fф
cr
pf
cr
i
w
f
k
k
Z
n
h
l
Z
b
...
1
...
1
...
1
)
(
)
2
(
140
2
...
1
,
bu erda
h
- nurlanish qismining balandligi, m; b - nurlanish qismining kengligi, m; Zcr -
charringning kritik chuqurligi, m; l
pf
- bog'lanish qulagan nur uzunligi, m; k
фf
- bu formulalar (2.10)
yoki (2.11) bilan aniqlangan l
pf
qismidagi egilish momenti diagrammasi shakliga bog'liq bo'lgan
koeffitsient:
k
fф
= 1,75
0,75
f
, при
l
pf
<0,5L, (2.10)
k
fф
= 1,35+1,45
(c/
l
pf
)
2
, при
l
pf
=0,5L,
,
n
l
f
M
M
p f
,
2
pf
l
c
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L - nurning uzunligi;
n
M
p f
l
M
oraliqning o'rtasida va aloqalar qulagan joyda lahzalar;
fжм
k
- doimiy koeffitsient nurlari uchun 1 ga teng bo'lgan koeffitsient;
k - nurlanish ta'siriga uchragan, uning uchastkasining balandligi bo'ylab nurlanish
tomonlarining soni (uch tomonlama isitish bilan k = 1, to'rt tomonlama k = 2 bilan).
1.
Nurni loyihalash qismidagi kuchlanishlar quyidagi formula bilan aniqlanadi:
,
...
1
...
1
...
1
,
,
i
i
i
w
w
f
n
w
f
W
М
6. Grafik tuzildi va Zcr aniqlandi:
7. Yong'inga chidamlilikning haqiqiy chegarasi (2.1) formula bo'yicha aniqlanadi.
Misol:
№ 1. Yong’in paytida ishlaydigan yog'och yonishning yong'inga chidamliligini hisoblash.
Dastlabki ma'lumotlar:
Taxmini
y
oralig'i
L, m
Kesmaning
o'lchamlari,
mm
To'liq
dizayndagi
nurli yuk q
kPAa
Beam
qadam
a
b
m
Yog'och
navi
Isitilgan
tomonlarni
ng soni
Yiqilish
sodir
bo'lgan
nurning
uzunligi
ulanishlar
l
pf
, m
В
ари
ан
тл
ар
№
Balandligi h
Kengligi
B
b
12
990
160
2,7
6
2
3
3
1
11
980
165
2,6
5
2
3
3
2
13
950
155
2,7
6
2
3
2
3
10
970
150
2,8
8
2
3
2
4
9
960
160
2,9
7
2
3
3
5
σ
f,
Z
cr
R
f,w
Z
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12
975
145
2,6
5
2
3
3
6
8
995
130
2,5
4
2
3
2
7
11
990
135
2,4
6
2
3
2
8
13
995
145
2,3
4
2
3
3
9
14
900
155
2,1
5
2
3
2
10
10
970
165
2,2
7
2
3
3
11
11
960
140
2,0
6
2
3
3
13
12
965
160
1,9
5
2
3
2
14
13
975
150
2,3
4
2
3
2
15
10
980
155
2,5
5
2
3
3
16
11
975
154
2,1
3
1
4
3
17
12
980
150
2,7
3
1
4
3
18
11
980
165
2,3
4
1
4
3
19
13
950
155
2,5
3
1
4
2
20
13
970
150
2,1
4
1
4
2
21
10
960
160
2,9
3
1
4
3
22
11
975
145
2,6
3
1
4
3
23
8
995
130
2,5
3
1
4
2
24
11
990
135
2,4
3
1
4
2
25
13
995
145
2,3
3
1
4
3
26
14
900
155
2,1
3
1
4
2
27
10
970
165
2,2
3
1
4
3
28
11
960
140
2,0
3
1
4
3
29
12
965
160
1,9
3
1
4
2
30
Biz yong’inga ta'sir etuvchi standart yukni hisobga olgan holda hisoblash usuli bilan nurga
nisbatan yong'inga qarshilik talablarini aniqlaymiz.
1 metr uzunlikdagi uzunlik uchun standart yuk:
qn
=
q
aб /
f
= 2,7
6 / 1,2 = 13,5 кН/ м.
h / B
b
= 990 / 160 = 6,19
1.
Kuchni yo'qotish uchun normal stresslarni hisoblash:
fw
n
w
R
W
M
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м
кН
qL
M
n
243
8
12
5
,
13
8
2
2
Oddiy stresslar uchun quvvatni o'zgartirish omili:
36
,
0
10
26
10
14
,
26
10
243
6
3
3
fw
n
W
WR
M
Bu yerda:
W
- to'rtburchaklar kesim uchun qarshilik momenti, ga teng
W
=
b
б
h
2
/ 6 = 160
990
2
/ 6 = 26,14
10
6
мм
3
= 26,14
10
-3
м
3
;
R
fw
- bu 26 MPa ga teng bo'lgan, qizdirilganda yog'ochning egilishga loyiq qarshilik kuchi
(2-darajali yog'och uchun 2.1-band. [2]);
P.2.3.1 [2] monogramma bo'yicha qizdirilgan tomonlar soni 3 uchun,
h / b
б
= 6,19 и
w
= 0,36, biz buni aniqlaymiz
z
crw
= 0,25
b
б
= 0,25
160 = 40 mm (topilgan kesishish nuqtasi chiziqli nuqta chizig'idan
pastda joylashganligi sababli).
2.
Quvvatni yo'qotish uchun siljish stresslarini hisoblash:
fqs
A
R
A
Q
5
,
1
Standart yukdan kesish kuchi
81
2
12
5
.
13
2
L
q
Q
n
n
кН
Kesish
stresslari
uchun
quvvatni
o'zgartirish
omili
7
.
0
10
1
.
1
10
990
10
160
10
81
5
,
1
5
,
1
6
3
3
3
fqs
б
n
a
hR
b
Q
bu erda R
fqs
- 1,1 MPa ga teng bo'lgan yog'ochning parchalanishga qarshi yonish qarshiligi
(2-darajali yopishtirilgan yog'och uchun 2.1-bet. [2]).
P.2.3.2 [2] monogramma bo'yicha qizdirilgan tomonlar soni 3 uchun,
h / b
б
= 6,19 и
А
= 0,7 buni aniqlang
z
crА
= 0,025 h = 0,025
990 = 24,75 мм.
3.
Yukni hisoblash:
1.
Karbonizatsiya
chuqurligining
chegara
qiymatlarini
toping
мм
V
Z
cr
6
6
,
0
10
10
1
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L
pf
uzunligining ma'lum bir qismidagi bog'lanishlarning yong'inga chidamliligi an'anaviy
ravishda 0,25 soat (15 min) deb qabul qilinadi, chunki ular metalldir. Shu vaqt ichida τ
0
=5 min ni
hisobga olgan holda nurlanish uchastkasining karbonlanish chuqurligining qiymati.
V
V
Z
cr
10
)
5
15
(
1
V - yog'ochni yoqish tezligi 2.2-bandga muvofiq olinadi [2].
мм
b
Z
cri
40
160
25
,
0
25
,
0
Ushbu chegaralar ichida har qanday uchta Z qiymatini tanlaymiz.
Z
cr1
=10 мм, Z
cr2
=20 мм, Z
cr3
=30 мм,
Z
cr
/ h nisbatini aniqlaylik
Z
cr1
/h = 10/990 = 0,01
Z
cr2
/h = 20/990 = 0,02
Z
cr3
/h = 30/990 = 0,03
P.2.3.1 [5] monogramma bo'yicha qizdirilgan tomonlar soni 3 va bilish uchun
h / b
б
= 6,19 , biz Z
cr
/h ga qarab η
w1…
η
w3
koeffitsientlarini aniqlaymiz.
η
w1
= 0,86
η
w2
= 0,73
η
w3
= 0,6
Biz
)
(
3
1
...
fw
fw
koeffitsientlarning qiymatini (2.9) formulaga binoan yog'ochni uch
tomondan charxlash natijasida nurlar oralig'idagi kesmaning o'lchamlari o'zgarishini hisobga
olgan holda aniqlaymiz.
Buning uchun avval
k
fф
- (2.10) yoki (2.11) formulalar bo'yicha
l
pf
qismidagi egilish
momenti diagrammasi shakliga qarab koeffitsientni aniqlaymiz.
кНм
l
L
l
L
q
M
pf
pf
n
lpf
25
.
182
3
2
12
3
2
12
2
5
.
13
2
2
2
75
,
0
243
25
,
182
f
Demak, lpf <0.5L dan kelib chiqadi.
k
fф
= 1,75
0,75
0,75=1,1875
fжм
k
= 1.
n - nurlanish ta'siriga uchragan nurning uchastkasining balandligi bo'ylab tomonlari soni
(uch tomonlama isitish bilan n = 1, to'rt tomonlama n = 2 bilan).
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Подставляем в формулу и вычисляем:
Formulaga almashtiring va φ
fw
ni hisoblang:
108
,
1
1
1875
,
1
)
01
,
0
1
99
,
0
(
3
)
01
,
0
2
16
,
0
(
140
2
1
,
w
f
82
,
0
1
1875
,
1
)
02
,
0
1
99
,
0
(
3
)
02
,
0
2
16
,
0
(
140
2
2
,
w
f
58
,
0
1
1875
,
1
)
03
,
0
1
99
,
0
(
3
)
03
,
0
2
16
,
0
(
140
2
3
,
w
f
Keyin (2.12) formuladan foydalanib σ
fw
nurining dizayn qismidagi kuchlanishlarni
aniqlaymiz:
;
8
,
9
86
,
0
10
14
,
26
108
,
1
10
243
3
3
,
1
МПа
w
f
;
5
,
15
73
,
0
10
14
,
26
82
,
0
10
243
3
3
,
2
МПа
w
f
;
7
,
26
64
,
0
10
14
,
26
58
,
0
10
243
3
3
,
3
МПа
w
f
σ
f,w
ning Z
i
(
R
fw
= 26 МПа)ga bog'liqlik grafigini tuzamiz:
Z
cr,уст
= 29,5 мм.
0
5
10
15
20
25
30
0
10
20
30
40
Z
σ
f,w
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Выбираем из трех вычисленных
Z
cr
– наименьшее:
Z
cr
= 24,75 мм.
Biz aniqlaymiz
мин
V
Z
cr
cr
25
,
41
6
,
0
75
,
24
V (charging darajasi) = 0,6 (s.2.2. [2])
П
ф
= 4 (мин) + 41,25 (мин) = 45,25
min ni aniqlang.
Kuchlanishda ishlaydigan yog'och konstruktsiya elementlarining yong'inga chidamliligini
hisoblash.
Cho'zish uchun tenglik (2.3)
ft
=
R
ft
shaklini oladi. Ushbu tenglikni quyidagicha ifodalash
mumkin:
,
ft
A
n
R
A
N
Bu yerdan
,
A
R
N
ft
n
A
Qayerda:
N
- bo'ylama me'yoriy kuch, H;
R
ft
- hisoblangan tortishish kuchi (2.2-jadval), Pa.
Bundan tashqari,
=f(h/b,Z
cr
/h)
(2.3-bo'lim [2]) bog'liqligidan foydalanib,
Z
cr
/h
,
parametrining qiymati, keyin
Z
cr
.
zaryadlash chuqurligi aniqlanadi.
cr
и
П
ф
qiymatlari (2.1) va
(2.2) formulalar bilan aniqlanadi.
N - bo'ylama me'yoriy kuch,H;
R
fс
- dizayndagi siqilishga qarshilik (2.2-jadval), Pa.
Jadval 2.2 - yog'och inshootlarning yong'inga chidamliligi chegaralarini aniqlash uchun
dizayn qarshiligi Rf.
Kuchlanish qarshilik
Belgilar
Yog'och turiga qarab dizayn qarshiligi,
MPa
1
2
3
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Bükme
Don bo'yicha siqilish
Elyaflar bo'ylab cho'zish
Elyaflar bo'ylab maydalash:
butun
yopishtirilgan
R
fw
R
fc
R
ft
R
fqs
29
26
20
3,0
1,2
26
23
15
2,7
1,1
18
16
-
2,7
1,1
Ma'lumki, metall issiqlik tarqalishining yuqori koeffitsientiga ega, shuning uchun uning
qalinligi bo'yicha haroratni tenglashtirish juda tez sodir bo'ladi. Bu bir xil harorat taqsimotini
qabul qilishga imkon beradi.
red
ст
tem
ст
в
cm
ст
t
с
t
t
t
t
)
(
,
himoyalanmagan metall konstruksiyalarning haroratini hisoblash algoritmi. Tenglamadan
kelib chiqadigan bo'lsak, isitish vaqtida konstruktsiyaning harorati metallning pasaytirilgan
qalinligiga bog'liq (belgilangan tred).
Metallning berilgan qalinligi har qanday tasavvurlar konfiguratsiyasiga ega bo'lgan
novdalarni oddiy plastinkaga kamaytirishga imkon beradi. Kamaytirilgan metall qalinligining
qiymati odatda kesmaning uning qizdirilgan perimetrga nisbati sifatida aniqlanadi, ya'ni.
U
A
t
red
Qaerda:
A - tasavvurlar maydoni, m2;
U - isitiladigan perimetr, m
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ГРУЗОПОДЪЕМНЫХ КРАНОВ В СТРОИТЕЛЬНО-МОНТАЖНЫХ РАБОТАХ.
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