Stu.kct2.Nha Nhip Lon

8/12/2019 Stu.kct2.Nha Nhip Lon

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KT CU THP NH NHP LN.

2. Kt cu phng chu lc3. Kt cu mi khng gian4. Hmi treo


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Phm ving dng v c im Nh nhp l n l nh c khang cch ct theo ph ng ngang

l n (>40m) Sdng cho cng trnh dn dng v cng nghip. Dn dng: rp ht, nh trin lm, sn vn ng, nh ga,

, Nh cng dng c bit: gara t, hng ga my bay. Cng nghip: x ng ng tu, x ng lp rp


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c im Khng phi l nhng cng trnh xy dng hng lot, m l

nhng cng trnh n chic, yu cu kin trc cao phh p v i chc nng.

Kch th c ca cng trnh thayi trong phm vi rt rng.~ ,

bay c nhp t100m~120m, chiu cao 8~10m. X ngng tu c nhp 20m~60m nhng chiu cao t30~40m

Chyu chu ti trng bn thn v tm l p.


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Kt cu phng chu lc.Kt cu kim dm dn

Kt cu khungKt cu vm


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Kt cu kiu dm dnKt cu chnh theo ph ng ngang nh l dm hay dn k lnct hay gi ta n gin.

c dng cho cng trnh cng cng nhrp ht, nh vnha, cng trnh ththao,.c mt bng hnh cha nht.

.Trong nh nhp l n kt cu dm c sdng t ng i t,nhp ca chng trog khong 35m~40m. Sn xut n gin,dbo d ng.


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DnDn c thl dn t nh nh hay siu t nhHnh dng dn cnh song song, hnh thang,a gic, tam gic hochnh cung. Vic la chn hnh dng dn phthucyucu sdng, yu cu kin trc cung nhcc yu cu khc.dn cnh song song dng cho nh c mi v i dc nh, dn cthl dn n gin hay dn lin tc, nhp n 60m. nh cu to

cc nt dn gi ng nhau, chi u di cc thanh bng b ng nhau nn n gin trong vic chto, do chng c sdng t ngi rng ri.dn hnh thangdng cho nh c dc khng l nlm(1/12~1/15).dn a gic c thanh cnh trn gy khc stit kim vt liunhng chto phc tp, th ng dng cho nh 1 nhp c nhp t60m~90m.


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dn tam gic dng cho mi c dc l n(1/5~1/7) c th cu to thai na dn lin kt bng thanh cng, nhthsgim chiu cao chuyn ch . dn kiu ny c nhp 40m~50m.dn tam gic cu to thai dn cnh song song c thanh cngv thanh ng c dng v i nhp n 90mv ti trngn .dn hnh cung c dng cho nhp 60m~100m. nu ngcong ca thanh cnh trn c dng parabol thi khi chu lc nilc thanh cnh skhng i khi chu ti trng phn bu. dn hnh cung c hai parabol cho tit din thanh cnhtrn v d i bng nhau, n nh tng do hthp trngtm.


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hthanh bng c chn theo nguyn tc sao cho trngl c dn nhnht v cng chto l t nht.chiu cao gia dn c ly nhsau: dn cnh song song1/8~1/14 nh p; dn hnh thang 1/8~1/12 nh p; dn tam

~ ~nhp; chiu cao dn lin tc c thly gim i 15~20%.

vng cho php 1/250 nhp, chng ta c thcu to vng xy dng cho dn.vng ny ly bng ng vngt nh ti cng 1/2 vng do hot ti. khi c vng xdkhng cn kim tra vng.


9/24

tit din cc thanh dn c chn sao cho sl ng thanhtrong dn l t nht, dcu to nt v dlin ktv i kt cukhc. khi chn tit din thanh dn cn lu :chu cao tit din thanh khng qu 1/8~1/10 chiu dai

.khi ni lc thanh cnh thayi nhiu th cn thayi titdin thanh, c gng chthayi l chkhuch i dn.

thayi tit din khng v t 1,5% chiu caoi v i Hv T, 4%i v i I v tit din kn.


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kt cu khung sdng cho nhp 40~150m. i v i nhp l n h n sdngkt cu khung skhng kinh t.

u im so v i dn:trng l ng bn than b, cng l n chiu cao dm ngang

.khuyt im: chiu cao tit din ct l n, chu nh h ngca ln v thayi nhit .khung c hai loi khungt hoc rng, gim b t lc xngang cho kh p c thsdng thanh cng.


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t lgia chiu cao x ngang v nhp khung nn ly:

1/30~1/40nhp

i v

i khung

c.1/12~1/20 nh p i v i khung rng.khung rng c nhp l n t100m~150m. khung c th

ng p ay ai p ti m ng ay n .


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c im tnh tonxc nh ni lc.

s

tnh l cc thanh

i qua tr

ng tm tit din thanh (c

t,x).

tnh ton cc cu kin ring r.


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Vmdng cho cng trnh nh trin lm, cung vn ha, bb i,hngga,...c mt bng hnh chnht.so v i kt cu khung, hvm c mmen un nhh n nn titkim c vt liu.vm hai kh , 3 kh , khn kh vm 2 kh p nh c squay tdo ca kh p gi nn vm c thbin dng c, do khng ny sinh ng sut do thay i nhitv ln gi ta.

vm ba kh p l ht nh nh , mng nhh n , khng chu nhh ng ca nhi5tnhng ni lc trong vm l n h n vm 2kh p, kh p nh gy kh khnchocu to vm v mi.


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vm khng kh p c sphn bmmen t ng i iu h ndo tit kim vt liu nht, nhnht. nhng yu cumng l n h n chu nh h ng ca ln gi ta v thayinhit .


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c im cu to v tnh tontrc ca vm nn ly gn trng v i ngp lc vmchyu chu nn. khi chu ti trng phn b u th trcca vm nn c dng hnh parabol.vm th ngkgi ln cc khung, chu lc xo ngang ngth i kt h p lm khn i v cc phng chc nng. khi vm

n m t t t ng gian g n n g n c n v m ngsdng c do hn chvchiu cao. khc phc, phngn gi vm c lm thng, v i dng ny vm lm vicgn ging nhhkhung nhng chi ph vt liu sgim ing k.mi tn vng f phthuc vo iu kin sdng, iu kinkin trc hay kinh t


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tsl i nht f=1/5~1/6L. khi tang f th s gim lc dctng mmen trong vm. nhng do yu cu kin trc nn lyf=1/2~1/5L.vm hai kh p th ng lm tit din cnh song song.vm tit din rng th ng lm dng cnh song song hockhi nhp l n th ph n g i ta vm c lm th ng .hthanh bng ca vm rng dng tam gic c thanh chngnghay htam gic, thanh ng c th t vung gc v ithanh cnh hay thng ng. thun tin cho vic chuynch vm c chia ra thnh tng an di 6~9m v ckhuch i bng cc mi ni cng tr ng.


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chiu cao tit din vm c khong 1/50~1/80 nh p, cavm rng 1/30~1/60L. ti t din th ng Ii v i vmcv vm rng c thit knhdn.vm c tnh v i cc ti trng tc dng ln n nhtnh

, , . xc nh ni lc ta tch ra nhng vm phngv dng ccph ng php tnh ca c hc kt cu hay phn thu hn.


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Cc loi khpKh p bn: c cu to n gin nht v c sdng khiphn lc gi khng l n lm.Kh p ci : dng khi phn lc gi l n h n gm hai vtrcng tip xc v i nhau, bulonggng ci d i vo mng.

.Kh p u: dng khi phn lc gi rt l n (8000~12000KN)cu to gm hai th t trn v d i gia c thanh tr c.Vm c gng cht vo th t qua tm thp hn theo chu vitiet din v bt bulng vo th t trn


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Kt cu mi khng gianKt cu khng gian chia lm 2 loi: hkhng gian phng vhkhng gian dng v. m bo cng cn thit hkhng gian phng cn phi lm hai l p. hkhng gian dngvc thlm mt hay hai l p. cu trc c bn ca hktcu khn ian l mn l i cc thanh.


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mi cuponl mt dng kt cu khng gian c mt cong hai chiu dngcho cc cng trnh mt bng hnh trn haya giciuc ba loi: cupon s n, cupon s n vng v cupon l i.


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cupon snl mt hthng cc vm (hai hay ba kh p) t theo ph ngbn knh. vm c lin kt v i nhau bng xa gv gnggia cc x g. ti v tr nh ca cupon btr mt vngcng gi l vngnh. u trn cc s n c lin kt vovn nh. vn nh hi cn v n chu nn, un vxon.tit din ca s n c thrng hayc.


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tnh tan cuponV cc s n t t ng i dy nn c ththay thlc xngang H thnh lc phn b u: p=nH/2 rLc ko trong vnh gi l: Nv = pr = nH/2

Bin dng ton vanh: l = N vlv/E vAv = nrH/E vAv i n ng t eo p ng ng n c a v n g i :

2r + l = 2r 1

Vy

v = 2r 1 -2rBin dng thanh cng quy c


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cn bng bin dng stnh c din tch thanh cng quy c cn thit.

Stu.kct2.Nha Nhip Lon

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