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n kt cu thp 2

GVHD: Nguyn ThBch Thy

SVTH: Hong By - 81100253

N KT CU THP 2

NH CNG NGHIP MT NHP MT TNG

I. Sliu:- Nh cng nghip mt nhp mt tng, c hai cu chy cng sc trc, chlm

vic trung bnh.- Nhp: L = 27 m-

Sc trc: Q = 15 T- Cao trnh nh ray: Hr= 9.2 m-

Chiu di: B = 90m, vi B = 6 m- Xy dng ti Qung Ninh (Cm Ph).-

Vt liu lp: panen .- Nh lm bng thp CT34 (f = 22 kN/cm2).-

Que hn N42, 42, hn tay.

-

Bulng tchn.-

Btng mng B15.II. Chn s bkch thc tit din khung:1. Kch thc cu trc:

Da vo sliu ban u: Q = 15 T v L = 27 m, tra catalogue ta c:- Loi ray ph hp: KP70-

Nhp Lk= 26 m- Chiu cao gabarit ca cu trc: Hc= 2300 mm-

Brng cu trc: Bc= 6300 mm- Khong cch gia hai trc bnh xe ca cu trc: K = 4400 mm-

Kch thc ttim ray n mp ngoi cu trc: B1= 280 mm- p lc bnh xe ln ray:

max

toP = 20 T

min

toP = 5.8 T

- Trng lng xe con: 8.4 T-

Trng lng cu trc: 38.5 T2. Kch thc khung ngang:

Yu cu:

-

m bo svn hnh ca cu trc.-

m bo chiu cao thng thy.- m bo nhp ca cu trc Lk.

a. Kch thc theo phng ng:m bo svn hnh ca xe con v chiu cao thng thy.

- Chiu di cn thit ca on ct trn:

Ht= hdct+ hr+ Hc+

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Vi:

1 1 1 1

6 (0.75 0.6) 0.78 10 8 10

dcth B m m

200 0.2r

h mm m

2300 2.3c

H mm m

1 1

0.1 0.2 27 0.1 0.2 (0.37 0.47) 0.4100 100

L m m

Ht= 0.7 + 0.2 + 2.3 + 0.4 = 3.6 m

- Chiu di ct di:Hd= Hr(hdct+ hr) + Hm= 9.2(0.7 + 0.2) +0 = 8.3 m

b. Kch thc theo phng ngang:m bo svn hnh ca cu trc v khong cch gia hai ray Lk.

-

Chiu cao tit din ct trn:1 1 1 1

3.6 (0.24 0.36) 0.315 10 15 10

t t th H m h m

- Chiu cao tit din ct di:Chn trc nh vti tim ct trn:

27 260.5

2 2

kL L

m

0.30.5 0.65

2 2

t

d

hh m

Kim tra: 1

0.30.5 0.28 0.07 70

2 2

th

D B m mm tha

Mt khc:1 1 1 1

8.3 (0.6 1)14 8 14 8

d dh H m

Vy chn hd= 0.65 m

c.

Chn s dn mi v ca mi:

Vi nhp L = 27 m, ta chn s dn v ca mi nh sau:-

Chiu cao u dn: Hd= 2 m- Chiu cao ca mi: Hcm= 2 m

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- Nhp ca mi:1 1 1 1

27 (9 13.5) 93 2 3 2

cm cmL L m L m

- dc: i = 10%

III. Btr hging:1. Nhim v:-

To khi cng khng gian, vch cng bt bin hnh cc khung khc ta vo.- Gim chiu di tnh ton ngoi mt phng cho thanh chu nn.-

m bo slm vic khng gian cho hkt cu khi chu ti ngang.

-

Truyn ti dc nh xung mng.-

Gip n nh trong qu trnh thi cng.2. Btr:a.

Hging ct:

b.

Hging mi:

Hnh 1. S dn dkin

Hnh 2. S btrhging ct

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Hnh 3. S hging ca mi

Hnh 4. S hging cnh trn

Hnh 5. S hging cnh di

Hnh 6. S btr hging ng ca ca mi

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IV. Xc nh ti trng: Chn s tnh (b)1. Ti trng thng xuyn:- Ti trng do cc lp mi:

Ti trng do cc lp mi Ti trng tiuchun

gmc(daN/m2)

Hsvtti

Ti trngtnh ton

gm(daN/m2)

Tm panen 1.5x6mLp cch nhit bng b tng nhdy 4cmLp btng chng thm dy 4cmLp va xi mng lt dy 1.5cmHai lp gch l nem dy 4cm

15040

1002780

1.11.21.11.21.1

16548

1103288

Tng cng 397 443

-

Trng lng kt cu mi v hging: 21.2 1.2 0.9 27 29.2 /cd dg L daN m

Hsvt ti: n = 1.2

21.2 29.2 35 /tt cd dg n g daN m - Trng lng kt cu ca tri:

Chn theo kinh nghim: 215 /cctg daN m Hsvt ti: n = 1.2

21.2 15 18 /tt cct ct g n g daN m Chuyn ti mi thnh cc lc tp trung t ti mt dn:

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1

2 3

4

5

3 4.436 0.35 43.22( )

2 cos(arctan(10%))

4.433 6 0.35 86.44( )

cos( arctan(10%))

3 4.5 4.43 4.56 0.35 6 0.18 110.48( )

2 2 cos( arctan(10%)) 2

4.434.5 6

cos( arctan(10%

P kN

P P kN

P kN

P

0.35 0.18 134.52( )))

kN

Lc tc dng vo mt bn ct:

1 2 3 4 5/ 2 43.22 2 86.44 110.48 134.52 / 2 393.84( )mV P P P P P kN

Momen lch tm gia ct trn v ct di do tnh ti mi:393.84 0.175 68.92( . )

mM kN m

-

Trng lng ca dm cu trc t ti vai ct:Chn theo kinh nghim: 0.6 /dctg t m

0.6 6 10 36( )dct

G kN

Momen lch tm gia ct trn v ct di do tnh ti dm cu trc:36 0.325 11.7( )

dctM kN

Tng momen lch tm gia ct trn v ct di do tnh ti gy ra:

, 68.92 11.7 57.22( . )m dctM kN m (Ngc chiu kim ng hi vi ct tri v

cng chiu kim ng hi vi ct phi)2. Ti trng sa cha mi:

Theo TCVN 27371995, ti trng sa cha mi lp panen b tng ct thp cly pn= 75 daN/m2, vi hsvt ti n=1.3Gi trti sa cha mi tnh ton:

275 1.3 97.5 /ttn np n p daN m Chuyn thnh ti tp trung t ti cc mt dn:

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1

2 3

4

5

3 0.9756 8.82( )

2 cos(arctan(10%))

0.9753 6 17.64( )

cos( arctan(10%))

3 4.5 0.9756 22.05( )2 2 cos( arctan(10%))

0.9754.5 6 26.46( )

cos( arctan(10%))

P kN

P P kN

P kN

P kN

Lc tc dng vo mt bn ct:

1 2 3 4 5/ 2 8.82 2 17.64 22.05 26.46/ 2 79.38( )smV P P P P P kN

Momen lch tm gia ct trn v ct di do hot ti sa cha mi:79.38 0.175 13.89( . )

smM kN m

3.

p lc ca cu trc ln vai ct:

Cc ti trng ny c xc nh theo cng thc:max max

max max 1

. .c iD n n P y

M D e

min min

min min 1

. .c i

D n n P y

M D e

Cc sliu tnh ton c xc nh nh sau:- Sc cu ca cu trc 150 kN;-

Hsvt ti n = 1.1;- Hsthp, xt n xc sut xy ra ng thi ti trng ti a ca hai cu trc

hot ng cng nhp nc= 0.9;- Tbng catalogue ca cu trc, ta tra ra gi trca Pmax= 200 kN, tng trng

lng cu trc G = 385 kN, slng bnh xe mt bn ray no= 2.- Gi trPminc xc nh theo cng thc:

min max

150 385200 67.5( )

2o

Q GP P kN

n

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Tcc kch thc ca cu trc B = 6300, K = 4400 c tra catalogue, ta c thspxp cc bnh xe cu trc nh s di.

Thnh vta c:

1

2

3

4

1

6 1.9

0.6836

6 4.40.267

6

0

1.95i

y

y

y

y

y

Ta tnh c:

max

max

1.1 0.9 200 1.95 386.1( )

386.1 0.325 125.5( . )

D kN

M kN m

min

min

1.1 0.9 67.5 1.95 130.3( )

130.3 0.325 42.4( . )

D kN

M kN m

Lc x ngang ca cu trc:Trng lng ca xe con c tra tcatalogue ca cu trc v bng Gxc=84 kN. Ginh rng cu trc sdng mc mm, fms= 0.1. Tng hp lc hmngang, tc ng ln ton cu trc l:

Hnh 7. S sp xp bnh xe cu trc v ng nhhng phn lc gi ta.

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' 150 84. 0.1 2 11.7( )4

xco ms xc

xc

Q GT f n kN

n

Lc hm ngang tiu chun ln mt bnh xe ca cu trc:

1

11.75.85( )

2

o

o

TT kN

n

Vy lc x ngang ca cu trc l:

1 1 1.1 0.9 5.85 1.95 11.29( )iT n n T y kN Lc x ngang ny c t cao trnh mt trn ca dm cu chy.

4.

Ti trng gi:Cng trnh c xy dng Cm Ph(Qung Ninh) thuc vng gi III.B nn plc gi tiu chun qo= 125 daN/m2. Cc hsnh sau:

-

Hsvt ti n = 1.3- Hskh ng c (xem hnh)

- Hscao v a hnh k.

Ti cao 10 m, a hnh B: k = 1Ti gi phn bu trn ct trong khong cao t0 - 10 m:

. . . . 125 1.3 0.8 1 6 780( / ) 7.8( / )d oq q n c k B daN m kN m

. . . . 125 1.3 0.5 1 6 487.5( / ) 4.875( / )h o

q q n c k B daN m kN m

Ti cao 13.9 m, a hnh B: k = 1.06

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Ti gi phn bhnh thang trong khong cao t10 - 13.9 m, vi gi trti nh thanh u dn:

. . . . 125 1.3 0.8 1.06 6 826.8( / ) 8.268( / )d o


. . . . 125 1.3 0.5 1.06 6 516.75( / ) 5.168( / )h o


Ti cao 14.8 m, a hnh B: k = 1.08Ti cao 16.8 m, a hnh B: k = 1.1Trong khong cao ny, hsc ly trung bnh ca cc gi trnutrn: k = 1.09Ton bphn ti gi tc dng tcao trnh 14.816.8 m c quy vWv Wh , vi h = 2 m.W . . . . . 1.25 1.3 1.09 6 0.7 2 14.88( )

d oq n k B c h kN

W . . . . . 1.25 1.3 1.09 6 0.6 2 12.75( )h o

q n k B c h kN

Quy ti trng gi vcc mt dn:

1

2 3

4

1 1W . . . 1.25 1.3 1.09 6 ( 0.6) 1.5 9

cos( arctan(10%)) cos( arctan(10%))

1W W 1.25 1.3 1.09 6 ( 0.6) 3 19.22( )

cos( arctan(10%))

1W 1.25 1.3 1.09 6 ( 0.6 1.5 0.8 2.cos( arctan(10%))

o i iq n k B c d

kN

5

5'

6

25) 28.84( )

1W 1.25 1.3 1.09 6 ( 0.8 2.25) 19.22( )

cos( arctan(10%))

1W 1.25 1.3 1.09 6 ( 0.4 2.25) 9.61( )

cos( arctan(10%))

1W 1.25 1.3 1.09 6 ( 0.4 2.25 0.5 1.5) 17.62( )

cos( arctan(10%))

W

kN

kN

kN

kN

7 8

9

1W 1.25 1.3 1.09 6 ( 0.5 3) 16.02( )

cos( arctan(10%))

1W 1.25 1.3 1.09 6 ( 0.5 1.5) 8.01( )

cos( arctan(10%))

kN

kN

V. Tnh ton ni lc khung: sdng phn mm sap2000

1.

Ni lc do tnh ti:

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N

Q

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2. Ni lc do hot ti mi:

M

N

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Q

M

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3. Ni lc do hot ti cu trc tri:

N

Q

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4. Ni lc do hot ti cu trc phi:

M

N

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Q

M

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5. Ni lc do lc hm xe con tri:

N

Q

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6.

Ni lc do lc hm xe con phi:

M

N

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Q

M

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7. Ni lc do gi tri:

N

Q

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M

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