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    TRNGI HCXYDNG

    BIBI GINGGING MNMN HCHC

    .Email: [email protected]

    Tel: 0906. 655. 553

    Bmn Cng trnh Thp - G

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    CHNG 5. GIN THP

    5.1. I CNG VGIN THP

    5.2. TNH TON GIN THP

    5.3. NT GIN THP

    Bmn Cng trnh Thp - G 2

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    5.1. I CNG V GIN THP

    1. Phn loi gin thp

    2. Hnh d n in th

    .

    4. Cc kch thc chnh ca gin

    5. Hging khng gian

    Bmn Cng trnh Thp - G 3

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    5.1. I CNG V GIN THP

    GinGin thpthp ll

    gg??

    gin thp

    thp ?

    Bmn Cng trnh Thp - G 4

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    5.1. I CNG V GIN THP

    Cc khi ni m v in th :

    nh ngha.

    Cc thanh in:Thanh cnh trn,

    Thanh bn xin

    Thanhxinu

    Thanh cnh di

    gin

    Thanh ng

    Lin kt ti nt gin: cc thanh gin c thlin kt trc tip vi nhau; hoc

    Bmn Cng trnh Thp - G

    thng thng chng lin k t vi nhau thng qua cc bn thp (hay bn m).5

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    5.1. I CNG V GIN THP

    l lin kt hn (l phbin nht), hoc lin kt bulng, hoc lin kt inh tn.

    10

    Bmn Cng trnh Thp - G 6

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    5.1. I CNG V GIN THP

    1. Phn loi gin

    1.1 Theo cng dng:Gin mi nh cng nghip, gin mi nh dn dng (v ko).

    Gin cu, gin cu trc, gin thp khoan,

    1.2 Theo cu to ca cc thanh ginGin nh: khi ni lc trong cc thanh cnh N < 200 tn; ti trng tcdng nhv vt khu nh.

    Cc thanh gin c to thnh tmt thp gc L hay mt thp trn;Gin thn :

    Sdng khi ni lc trong cc thanh cnh l kh ln N < 5000 kN; ti trng

    Cc thanh gin c to thnh t2 thp gc, c dng hnh chT, chthp

    Bmn Cng trnh Thp - G 7

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    5.1. I CNG V GIN THP

    Gin nng:

    Ni lc trong thanh cnh rt ln N 5000 kN; c sdng lm gincu, gin cu chy,...

    Cc thanh gin c dng thp tcc thp hnh hoc thp bn, c dng

    chI, hnh hp, . a) b) c)

    1.3 Theo skt cu:

    Gin ki u d m n gin:

    ,ln lch gia 2 gi ta.

    , , .

    Bmn Cng trnh Thp - G 8

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    5.1. I CNG V GIN THP

    Gin kiu dm lin t c:

    : c ng u n n n so v g nn gin, chiu cao gin nhhn, tit

    .

    N: chto v dng lp phc tp

    ln lch gia cc gi ta.

    Gin kiu dm c mt tha:

    :Ni lc phn btrong cc thanh gin hp l hn so vi ginkhng c mt tha, c thcn bng biu mmen gia gi v nhp

    Bmn Cng trnh Thp - G

    dm.9

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    5.1. I CNG V GIN THP

    e)

    : Sdng lm khung chu

    trnh c khu nhp ln

    : Sdng lm kt cu chu lc cho cc cng trnh

    vt u r t n, vt n p m ; n n tr nlm, nh ththao, k

    Gin kiu thp tr:

    Bmn Cng trnh Thp - G

    , ,sng,

    10

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    5.1. I CNG V GIN THP

    2. Hnh dng gin

    Cc yu cu chnh khi la chn gii php kt cu gin:

    .

    b) Yu cu thot nc mi:dc mi i ln hay b, hay mi dc hay mi thoi l.

    c) Yu cu vlin kt gia gin mi v ct: lin kt khp hay cng, nhm m bo h.

    d) Yu cu vvp hnh khi kin trc: to ra cc ng mi thng, cong, hay un.

    e) Yu cu vkinh t: dchto v dng lp, tit kim vt liu.

    Bmn Cng trnh Thp - G 11

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    5.1. I CNG V GIN THP

    a) Gin tam gic (a, b):

    d

    h h=

    450

    a

    0 ,2 0 ,288

    L L

    h0

    vi ct

    d1 /8

    c)

    h

    h

    o

    cim cu

    to, chu lc v

    Gin lin kt ngm vi cts dng ca cc

    loi gin?

    Bmn Cng trnh Thp - G 12

    1 C G G

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    5.1. I CNG V GIN THP

    d

    h

    L

    d) Gin a gic, gin cnh cung (h, k):

    h ) k

    h h

    LL

    cim cuto, chu lc vs dng ca cc

    Bmn Cng trnh Thp - G

    loi gin?13

    5 1 I CNG V GIN THP

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    5.1. I CNG V GIN THP

    3. Hthanh bng ca gin

    Yu cu vcu to cc nt gin:n gin, c nhiu nt ging nhau => dCc yu c u khi b tr thanh bng:

    ng n rong c o.Yu cu tng chiu di thanh bng: nh.

    .Yu cu thanh cnh trn: khng bun cc bdo ti t ngoi nt gin.

    a ) b ) dd

    b) Hthanh bng xin cu to, sdng?

    Bmn Cng trnh Thp - G 14

    5 1 I CNG V GIN THP

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    5.1. I CNG V GIN THP

    c) Hthanh bng phn nh:

    d)Ti trng tp trung tc dng ti nt gin

    c cs dng?

    L

    g) h)

    Bmn Cng trnh Thp - G 15

    5 1 I CNG V GIN THP

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    5.1. I CNG V GIN THP

    4. Kch thc chnh ca in thn

    a) Nhp gin L :

    =ta.

    2 u ct.

    ~

    36 m.

    , , , , , ,

    Bmn Cng trnh Thp - G 16

    5 1 I CNG V GIN THP

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    5.1. I CNG V GIN THP

    b) Chiu cao gia gin h, chiu cao u gin h0:Gin hnh thang, Gin cnh song song:

    a ) b ) dd

    eo u n n :

    Theo iu kin vn chuyn :

    h

    65

    Lh

    11

    Gin hnh tam gic:d

    0

    a ) b )

    0 ,2 0 ,288

    L

    h

    L

    h

    h0=

    4

    chiu cao hphthuc vo loi vt liu lp. 11

    Bmn Cng trnh Thp - G

    g c c c n r n c a g n ~ o ng yC th ly chiu caou gin h0 = 450 mm d lin kt.

    4317

    5 1 I CNG V GIN THP

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    5.1. I CNG V GIN THP

    4. Kch thc chnh ca gin (thng)

    c) Khong cch tm cc nt gin d:thanh cnh trn : d= 3 m hoc 1 5 khi sdn h in hn nh bng khong cch gia cc x g.

    =

    Ti sao d

    cnh di c , .

    d

    th ln hncnh trn?

    hh

    o

    i

    L

    d) Bc gin :Khong cch gia cc gin (bc gin) phthuc vo yu cu cngngh, kin trc.

    Bmn Cng trnh Thp - G

    Thng ly B = 6 m.18

    5 1 I CNG V GIN THP

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    5.1. I CNG V GIN THP

    5. H in khn ian

    Nguyn tc cu to:

    ,gin. Kt cu gin phng dmt n nh theo phng ngoi mt phng ca gin.

    Khi chu ti trng TT v HT tc dng theo phng ng => cc thanh cnh trn, v mtsthanh bng chu nn => Cn btr cc thanh chng dc nh tt ccc nt gin thucthanh cnh trn (v chu nn) ngn cn (hay ckt) cc nt gin khng cho chuyn

    dch ra ngoi mt phng gin;-i vi kt cu mi panen BTCT th cc tm panen cng c tc dng nhcc thanh

    dng.

    - Cn btr cc thanh chng dc nh trong tt ccc khoang vtr nt nh gin, nt u, .

    Bmn Cng trnh Thp - G 19

    5 1 I CNG V GIN THP

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    5.1. I CNG V GIN THP

    Khi ti tr n i tc d n vun c vi m t hn in => Ti tr n i tru nvo cc nt gin ca cthanh cnh trn v cnh di ca gin u hi.

    - Cn lin kt 2 gin phng thuc ca cc khoang u hi vi nhau => sdngcc thanh cho chthp => nhm to ra mt khi kt cu khng gian n nh

    2 ha u hi nh ch u ti tr n i n an .

    - Bng cch btr cc thanh chthp v thanh chng dc lin kt gia cc ntgin 2 gian u hi (2 khoang u hi).

    Gi l h ging khng gian nhm lin kt cc gin phng li vi nhau => toc c c u ng g an n n .

    Hging khng gian gm c 3 loi:- Hgi ng cnh trn n m trong MP thanh cnh trn;

    - Hging cnh di nm trong MP thanh cnh di;

    Bmn Cng trnh Thp - G

    - Hgi ng ng n m trong MP cc thanh ng.

    20

    5.1. I CNG V GIN THP

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    5.1. I CNG V GIN THP

    a) Hging cnh trn:

    H ging cnhtrn l g, c u

    to, b tr v

    b''

    tc dng?

    b

    a ce' g' a'

    a'

    c

    dge

    Cc gin

    ginhthno?

    Bmn Cng trnh Thp - G 21

    5.1. I CNG V GIN THP

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    5.1. I CNG V GIN THP

    b) Hging cnh di:

    H ging cnhdi l g, c u

    to, b tr v

    b''

    tc dng?

    ba

    ce' g' a'

    a

    dge

    Khi no cnb tr h

    ging dc?Ti sao

    cn gi l

    Bmn Cng trnh Thp - G

    gin gi?22

    5.1. I CNG V GIN THP

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    c) Hging ng:

    H in n

    bc' ' '

    a' b' c' l g, cu to,b tr v tc

    a

    dge

    adng?

    Bmn Cng trnh Thp - G 23

    5.2 TNH TON GIN THP

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    . n g n

    2. Ti tr n tc d n ln in3. Ni lc trong gin

    4. Chiu di tnh ton cc thanh gin. n p c a c c an g n

    6. Ch n v kim tra tit di n thanh in

    Bmn Cng trnh Thp - G 24

    5.2 TNH TON GIN THP

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    - Gm cc thanh gin c xp t c cc trc thanh ng qui ti mt im

    , .- Cu to cc ti trng t tp trung ti nt gin.

    - Trnh ti trng tc dng lm cong cc bcho cc thanh gin.

    - n to n g n t ng v c c t an g m t p g c .

    - =gin l lien kt khp v sdng cc phng php trong CHKC tnh.-i vi gin nng c thanh gin tit din hnh hp, chI, th c M kh

    Bmn Cng trnh Thp - G

    ln.25

    5.2 TNH TON GIN THP

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    2. Ti trng tc dng ln gin

    Ti trng thng xuyn (tnh ti)

    3. Ni lc tron in Cn tnh rin r cho tn trn h ti tr n :

    Ti trng tm thi

    Tnh ti:Ho t ti sa cha mi: xt 3 tr n h : Tc d n ln ton in Tc d n

    na tri gin (gy bt li cho thanh bng chu ct); v Tc dng na phigin.Ti trng gi: Tc dng ttri, Tc dng tphi. => Gi gy b t li cho nh

    mi nh.

    thanh cnh di. => Tnh gi trti trng ln nht ca cn trc treo tcd n ln nt in.

    Bmn Cng trnh Thp - G 26

    5.2 TNH TON GIN THP

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    4. Chiu di tnh ton cc thanh gin

    a)

    i v

    i cc thanh chu N ko:

    - Bph hovbn, vt liu t ti

    - Cn xc nh mnh kim tra vmnh ln nht, m bocng chy ca thp.

    .b)i vi cc thanh chu N nn:

    an g n c u n n cong rong m p ng g n o c cong v nra ngoi mt phng gin;

    =

    N

    .chu nn ng tm

    cmin

    Cn xc nh mnh ln nht ca cc thanh: );(max xMax

    Bmn Cng trnh Thp - G 27

    5.2 TNH TON GIN THP

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    Tit di n thanh in:

    x

    y

    x z

    Cn xc nh mnh ln nht ca cc thanh gin: );(max yxMax y

    xxx il ll xx AIi xx trong :

    yyy

    yy

    yy

    Cn xc nh chiu di tnh ton ca cc thanh gin lx v ly, hoc hsc u tn ton. x y

    cng ca bn mphthuc vophthuc vou tno?u tno?

    u n trong vngoi mt phng c

    Bmn Cng trnh Thp - G 28

    5.2 TNH TON GIN THP

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    y

    cong trong mt phng gin lx. lNt gin c lkhp l tng

    khng, ti sao?

    x yz

    l

    nt gin ph thucu t no? _

    _c

    d=l

    _

    __ +

    __

    ++ae

    xem l lin ktkhp, ngmn

    Bmn Cng trnh Thp - G

    lhi?29

    5.2 TNH TON GIN THP

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    i vi gin khng c hbng phn l

    V d: nh:

    - Thanh xin u in: lx = l. _ _ _

    b c d

    l=lx

    -Thanh xin th2: lx = 0,8 l __ + __

    - i vi gin c hbng phn nh:

    thanh xin u gin : lx = 0,5l

    e

    l

    Thanh xin th2: lx = 0,5l

    Bn m khi bun ra ngoi mt phng => c cng ngoi mt phng, .

    Thanh xin u gin: ly = l.i vi thanh gin khng c hbng

    Bmn Cng trnh Thp - G

    Thanh xin th2: ly = l.

    30

    5.2 TNH TON GIN THP

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    i vi thanh gin c hbng phn nh:l

    N2

    - Cc thanh xin (thanh xin u gin): C ni lc nn N1 vN2 vi N1 > N2.

    llN

    ly

    1

    225,075,0x y

    z

    N1

    - Thanh cnh trn v thanh cnh di: ly = khong cch gia 2im c kt ngn cn thanhcnh chuyn v ra khi mt phng gin

    . Thanh cnh trn: ly = khong cch gia cc x g, thanh chng dc nh, khongcch chn panen,

    . T an c n : y = o ng c c c c g ng c n ,

    c) mnh gii hn ca cc thanh gin:

    T an c u nn

    Thanh chu ko

    Bmn Cng trnh Thp - G 31

    5.2 TNH TON GIN THP

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    5. Tit din hp l ca cc thanh gin

    Tit din ca cc thanh gin thng bao gm 2 thp gc ghp li, thp gc u cnh haykhng u cnh.

    Thanh gin chu nn ng tm. Mt n nh theo phng c mnh ln nht max

    Tiu ch lm vic hp l ca cc thanh gin l (iu kin ng n nh):

    yx y

    x

    x

    ii

    Bmn Cng trnh Thp - G 32

    5.2 TNH TON GIN THP

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    5. Tit din hp l ca cc thanh gin

    Cc dng tit din ca thanh gin:

    a) b)

    x

    y y c) d)y

    x

    y

    x

    a c

    C tlbn knh qun tnh ca tit din:

    yx ii yx ii 5,0

    yx ii 75,0 yx ii

    Sdng thch hp khi ct c chiu cao tnh ton:

    yx ll yx ll 8,0 yx ll yx ll 5,0

    Bmn Cng trnh Thp - G 33

    5.2 TNH TON GIN THP

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    a. Nguyn tc chn tit din:

    - Tit din nhnht l L50 5.

    - Khng chn qu 6~8 loi thp trong 1 ginL 36 m.

    - KhiL 24 m : khng cn thay i tit din thanh cnh.

    - KhiL > 24 m : khng qu 2 loi tit din khi 24 36 m.-dy bn m chn theo ni lc ln nht ca thanh xin u gin, ( 6 mm)

    b) Chn v kim tra tit din thanh chu nn:

    Din tch tit din yu cu:c

    ycf

    NA min

    min cha bit, sbgithit

    gt = 60 80 i vi thanh cnh ; gt = 100 120 i vi thanh bng.

    TAyc , tra bng thp hnh chn shiu tit din v cc c trng hnh hc catit din: ix, iy,Ag

    Kim tra tit din chn: cfA

    N

    min

    Bmn Cng trnh Thp - G

    min theo yx ;maxmax 34

    5.2 TNH TON GIN THP

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    6. Chn v kim tra tit din thanh ginc) Chn v kim tra tit din thanh chu ko:

    N

    c

    ycf

    T c tra bn th hnh ch n s hi u v cc c trn hnhhc: ix, iy,Ag

    Kim tra tit din chn: cfN

    vn

    d) Chn tit din thanh theo mnh gii hn:

    ,

    x

    ycx

    l

    i ,y

    ycy

    l

    i

    Tra bng thp hnh chn shiu.

    Bmn Cng trnh Thp - G 35

    5.3 NT GIN THP

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    1. N u n tc chun

    Cc thanh gin c chn theo tit din hp l.

    Khi thanh cnh khng c thay i tit din m:im hi tca cc thanh gin nm trn trc ca thanh cnh.

    24L

    Khi thanh cnh c thay i tit din (khi ni thanh cnh) 3624 L ,

    trc ca thanh ln nu khong cch gia 2 trc thanh khng ln hn1,5% chiu cao ca cnh thp gc.

    Bn m nn chn c hnh dng n gin v m bo truyn lc tt:n c n , n ang, am g c, a g c .

    Bmn Cng trnh Thp - G

    ,

    lc gia thanh v bn m.36

    5.3 NT GIN THP

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    1. N u n tc chun

    Bdy ca bn m c chn theo ni lc ln nht trong cc thanh, . .

    Khe hgia cc u thanh bng v thanh cnh:206 bmtc mm

    80c mm

    Khe hgia 2 thanh cnh khi ni ly bng 50 mm.

    f

    chiu di l 50 mm (cho cng hn khng lin tc).

    Bmn Cng trnh Thp - G

    n c u p g c.37

    5.3 NT GIN THP

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    2. Nt trung gian

    a) b)

    Bmn Cng trnh Thp - G 38