- Cac yeu du v~ tiOOtoan va ki~m tra 1'rngsudt trong than d~p:
1. L~p sad6 tinh
M(it truqt va di€m I~t co the xay ra Clla tubng la m(it nen AB va tam I~t B, vi v~y ta chi xet cac l\I"ctac d\lllg len m(it AB.
Khi xac dinh n cM y: TrQng IUQ'Ilgban than tuang va trQng IUQ'Ilg<tAt5au lung tuang co xu th8 ch6ng truqt va ch6ng I~t nen lAyn = 0;95 va 0,9
- Tinh toan tIi 56 cac h,rc: + Cac Igc thfuIg dUng:
PI = 2,1 *0,4*2,4*0,95 = 1,92 TP2 = 0,4*2,5* 2,4*0,95 = 2,28 T P2 = 0,4*2,5* 2,4*0,95 = 2,28 T P3 = 0,5* 1,2*2,5*2,4*0,95 = 3,42 T P4 = 0,5*1,2*2,5*1,84*0,9 = 2,48 T Ps = 0,25*2,5* 1,84*0,9 = 1,04 T IP = 1,92+2,28+3,42+2,48+1,04 = 11,13 T + Lgc xil ngang (sad6 nay chi m(lt Igc):
A.c=tg2(45° - CPrt/2)= tg2(45° - 22/2) = 0,454
IQ = Ec =0,5Yrt(H+tlA.c.n= 0,5* 1,84*2,92 * 0,454* 1,2 = 4,22 T- Tinh toan mil men - Tinh toan mil men
+ Mil men ch6ng I~t:
MpI = 1,92*2,1/2 = 2,01 T.m Mp2 = 2,28*(0,25+0,4/2) = 1,03 T.m Mp3 = 3,42*(0,25+0,4+ 1,2/3) = 3,59 T.m Mp4 = 2,48*(0,25+0,4+2*1,2/3) = 3,60 T.m Mps = 1,04*(2,1- 0,25/2) = 2,04 T.m IMcL = 2,01+1,03+3,59+3,60+2,04=12,27 T.m + Mil men gay I~t:
IMGL = MEc = 4,22*2,9/3 = 4,08 T.m 3. Tinh toan cac h~ 56 6n dinh va ki~m tra
KL =IMcL / IMaL = 12,27/4,08 = 3,01
(11,13 - 0,00)* 0,35+1,5 * 2,1
- -167
Tra va tinh [K] (ph\ll\lc 5): Cong trinh cAp IV: kn = 1,15, td hqp l\lc caban: ne = I, tuang la tuang be tong tren n~n da: m = I
[K] = kn.ncfm = 1,15*111 = 1,15
Ki~mrava k~t1\$1:
Kmin= 1,67> [K]=1,15 : Tuang an toan v~ dn dinh 4. Tinh va ki~m tra lIng suAt day mong
DQ I~ch tam ecUa hqp l\lc cUa ap l\lc day mong:
e= 2,1 _ 12,27 - 4,08 =0 31 m
2 11,13 '
O'maxmin= ~L~P_-_L~W_(l:t_6e) = _11_,13_.~_O_,O_O(l:t _6*_0_,3_1)
. F L 2,1 2,1
O'max=10,06 T/m2
. 2
O'min= 0,55 Tim
O'max=10,06 T/m2 <R =155 T/m2 = 15,5 kG/cm2 va 0'min= 0,55 T/m2 > 0 : N~n tuang an toan v~ cuang dQ.
CAU HOI ONT~PCHUONG 4
1. Neu khai quat ve cac 10l;li~p b~g be tong va be tong c6t thep. Vm cac ~p vila va thApta nen dimg 10l;lid~p nao?
2. Neu d~c diem lam vi~c Cllad~p be tong trQng hrc; chUng khac bi~t nhiing gi so vm d~p dAt,d~p da? Khi thi~t k~ d~p trQng hrc ta cAnquan tam cM y~u nhiing vAnde gi?
3. Neu khai quat cach tinh toan m~t c~t Iythuy~t clla d~p be tong trQng h,rc. M~t c~t Iy thuy~t nay co y nghia gi?
4. Neu cac dl;lllgm~t c~t th\l'Cclla d~p trQng l\I'c tran va khong tran; d~c di€m, dieu ki~n (mg d\ll'lgCllam6i 101;li.
5. KhAudi~n tran la gi? chUng co y nghia gi trong S\l'lam vi~c Clla~p, Clla h~ th6ng va vm khu V\l'Cxay d\l'llg?Neu khal quat cach xac djnh khAudi~n.
6. Neu truang hgp bAt 19i nhAt ve tieu nang cho d~p tran va neu khai quat cach tinh chQntruang hgp bAt19inhAtve tieu nang va tinh toan chQnkich thu6c be tieu nang.
7. Thi~t bi thoat nu6'c, ch6ng thAmqua than, qua nen trong d~p be tong trQng l\I'cgi6ng va khac nhau gi so vm d~p dAt,d~p da? Neu cach chQnC\lth€ 2 10l;lithi~t bi nay cho d~p trQng l\I'cvira va nho.
8. Neu S\l'gi6ng va khac nhau gifra d~p trQng l\I'cvm d~p da, d~p dAtve tinh toan 6n dinh, cuang dQclla than d~p va nen d~p?
9. Neu cac truang hgp bAt 19i d€ tinh toan ki€m tra ve thAm, 6n djnh va cuang dQclla d~p trQngl\I'c.
BAl T~ CHUONG4
Btl; 4-1: MQt d~p tnm thuQc cong trinh d.p IV co in~tc~t thi~t k~ oou hiOO ve. H t b H'mh 4-28. H'mh ve bili 4-3 MNDBT 01' b ~< yo;: Do= 10,00m; H =3,50m; b =l,Om; B =2,50m; t = 0,60m; a = 0,50m; Y~t li~u lam ~p coYVL =2,35 T/m3 ;
a ~ luu: MN tuang (mg khi thao Iiithi~t k~ la 2,20m, MN thApooAt:khong co nuac.
Yeudu:
1. TiOOMNLTK cho d~p. Bi~t: Luu IUQ'IlgdiOOIii thi~t k~ Qp = 25m3Is; h6 coi OOukhong co kha nang di~u ti~t; chi~u rQng
nguang tran da chQnBI = 15m va khong co m6 gifra; cUa vao tuang d6i th~.
2. TiOOtoan va vebi~u d6 tdng ap I\i'cdAyndi len day d~p trong truemg hgp thUQ'Ilgluu la MNDBT va h~ luu khong co nuac. Bi~t chi~u dai duemg vi~n thAm tiOOtoan la 32,5m va ti:rthuQ'Ilgluu d~n di~m Ala l4,6m
3. Ki~m tra dn diOOva n~n cho d~p, bi~t n~n d~p la dAt co RIC = 1,50kG/cm2; h~ s6 rna sat gifra day d~p va n~n f= 0,27.
Btl; 4-2: Tiiill MNL TK cho d~p cho a bai 4-1 OOungthay d~p hiOOthang b~ng d~p hiOOcong dan gian, co h~ s6 luu IUQ'Ilgm = 0,42.
Btl; 4-3: Cho mQt d~p tran cosa d6 tioo toan OOuhinh ve . Cac d~c trung tiOOtoan xem bang s6 li~u :
Yeudu:
1- Ki6m tra dn diOOcho d~p.
2- ye bi~u d6 (mg suAt day mong va ki~m tra n~n cho d~p.
3- Y0; k~t qua dii tiOOtoan, gia Slr ta tang giilm bi. b2 sao cho (bl+b2) khong ddi, ho~c chocQtnuac thUQ'Ilgluu HIthay ddi ti:rHI d~n 0, hay cho OO~nxet v~ S\i'dn diOOva (mg suAtday mong cua d~p
Bi~t: Cong triOOthuQc cApIV, td hgp I\i'Cco ban; n~n Iiida c(mg ; R,,=15KG/cm2
5B' "["b"43 Bim~4- . an~so 'I'U al -
KH Dvi Ghi cM . a b c d
H m Chieu cao d~p 4,60 4,60 4,60 4,60
HI m CQt nuOc thugng luu 4,60 4,60
B m Chieu rQng day ~p 3,30 3,30 3,30 3,30 b m Chieu rQng dinh d~p 2,00 2,00 2,00 2,00 bl m Chieu rQng mai thugng 0,50
b2 m Chieu rQng mai h~ 0,80 1,30 1,10 1,10a m Chieu rQng phan du Clla 0,40 0,40 0,40 0,40 a m Chieu rQng phan du Clla 0,40 0,40 0,40 0,40
m6ng
t m Chieu cao m6ng 0,60 0,60 0,60 0,60
h. m 2,10 2,10
hb m 1,40. 1,40
YVL T/mj Tn;mg Iw;mg rieng v~t li~u 2,40 2,40 2,40 2,40 f H~ so rna sat gifra d~p vii 0,55 0,55 0,55 0,55
nen
C Tim" Lvc dinh gifra d~p vii nen 8,00 8,00 8,00 8,00
b
Btii 4-4: Cho mQt lu<m.gchfu dat bfug be tong lilm vi~c thea sad6 nhu hinh ve.
Biit: Cong trinh thuQc cap IV; nen Iii dat vii c6 RIC = 1 5 T, 1m2
Yeu cdu,'
l-Ki~m tra 6n djnh cho tU<m.g 2- Tim di~m d(it clla hqp Ivc Clla cac Ivc tac d\lng len day m6ng lu<m.g