Khoa Cng Trnh Thu BTLmn hc Nn v Mng N NN MNG - PHN MNG cc i thpI/ S liu:1. Cng trnh s: 15 * Ct: - Tit din ct: lc=30,bc=50- Cao trnh cu trc: 7 m- Cao trnh nh ct: 9,6m* Ti trng tnh ton:- Ti trng ng ti nh ct: Pa= 275KN- Ti trng ngang nh ct v gi: Pg = 25,5KN- Lc hm cu trc ngang: Tc1 = 2,9 KN- Lc hm cu trc dc: Tc2 = 2KN- Ti trng cu trc: Pc = 200KN2. Nn t:* Cao trnh mt t t nhin: 0.00m* B dy lp t ph mng khong 0,3-1,0m.PaPcPgTc2Tc1inh cotCau truc0,00mII/ Yu cu:* X l s liu, nh gi iu kin a cht cng trnh.Sinh vin : Phm Vn KhangGio vin hng dn : L Th L Page 1Khoa Cng Trnh Thu BTLmn hc Nn v Mng * xut v thit k mng cc i thp.* Bn v kh giy 297 840 v ng vo thuyt minh.Trn bn v th hin: cao trnh c bn ca mng cc thit k v lt ct a cht ( t l t 1/150 n 1/100), cc chi tit cc ( t l t 1/20 n 1/10), cc chi tit i cc ( t l t 1/50 n 1/30), bng thng k thp i, thp cc, cc ghi ch cn thit.Lp t S hiu Chiu dy (m)1 80 5,72 14 5,63 38 10,44 13I/ Xc nh ti trng do ct truyn xung mng.1. Ti trng thng ng.- Trng lng ca ct:Xc nh theo cng thc: . . . . G V b l h

Trong ::ti trng ring ctb:b rng mt ct ngang ctl : chiu di mt ct ngang cth: chiu cao ctG = 25.0,3.0,5.9,6= 36 KN- Ti trng ng ti nh ct: Pa = 275KN- Ti trng cu trc: Pc = 200KNVy tng ti trng theo phng thng ng tc dng ln mng l:N = 1,1.36 + 275 + 200 = 514,6 KN.2. Ti trng theo phng x.- Ti trng ngang nh ct v gi: Pg =25,5KN- Lc hm cu trc ngang: Tc1 = 2,9KNSinh vin : Phm Vn KhangGio vin hng dn : L Th L Page 2Khoa Cng Trnh Thu BTLmn hc Nn v Mng Vy Qx = 25,5 + 2,9 = 28,4KN 3. Ti trng theo phng y.- Lc hm cu trc dc: Tc2 = 2KN Qy = 2KN.Mmen theo phng x l: Mx = 2.7= 14KNmMmen theo phng y l: My = 2,9.7+ 25,5.9,6 + 200.1 = 465,1KNmKt lun: Cc ti trng tc dng ln mng l:

Ntt0=514,6-> Ntc0=514,6/1,1=467,82 Qtt0x=28,4 -> Qtc0x =28,4/1,1=25,82 Qtt0y=2-> Qtc0y =2/1,1=1,82 Mtt0x=14-> Mtc0x =14/1,1=12,73 Mtt0y=465,1 -> Mtc0y =465,1/1,1=422,82

II. Tnh ton cho mng.2.1 nh gi iu kin a cht cng trnh 1-L p 1 : S hiu 80, chiu dy 5,7m c cc ch tiu c l sau: W(%)Wnh(%)Wd(%)w(T/m3)(o)C(KG/cm2)Kt qu th ngim nn p e-Pqc(MPa)NPT50100 150 20029,733,128,71,932,7119300,385 0,80,7760,7640,7412,89 30- Ch s do : cng th xc nh : A=Wnh-Wd (%) A =33,1 28,7= 4,4 ( 1 A 7) t thuc loi ctpha- st : B=(W- Wd)/A=(29,7-28,7)/4,4=0,23 0B 1010-55-22-11-0.50.5-0.250.25-0.10.1-0.050.05-0.010.01-0.021 >0,5 >0,25>0,1 >0,05>0,01Tch ly23,3%57,8%63,7%74,8%85% 93,3%Ta thy hm lng ht c d > 0,5m chim hn 50%Sinh vin : Phm Vn KhangGio vin hng dn : L Th L Page 4Khoa Cng Trnh Thu BTLmn hc Nn v Mng

y l lp ct th.Theo kt qu xuyn tnh ta c : qc= 10,3(MPa)cq = 1030 (T/m2) = 103 (KG/cm2)Vy 50 < qc < 150 Trng thi ca t l trng thi cht vaTra bng I-3 sch bi tp c hc t 7 , 0 55 , 0 eVy c e = 0,625C:w=2,63.1.(1+0,194)/(1+0,625)=1,93M um nn p: chon2 E=1030.2=2060(T/m2)Tra bng vi qc= 1030(T/m2) 3- L p3 : S hiu 38 chiu dy10,4m c cc ch tiu c l sau:

W(%)Wnh(%)Wd(%)w(T/m3)(o)C(KG/cm2)Kt qu th ngim nn p e-Pqc(MPa)NPT50 100 150 20028,124,413,21,742,646150,079 1,0421,0060,9850,9750,51 4- Ch s do : cng th xc nh : A=Wnh-Wd (%) A =24,4 13,2= 11,2 ( 7 A 17) t thuc loi stpha- st : B=(W- Wd)/A=(28,1-13,2)/11,2=1,33 B>1 trng thi nho- H s rng : ( )94 , 0 174 , 1) 1 , 28 . 01 , 0 1 .( 1 . 64 , 2101 . 1 1 . . + + WnWe - l rng ca t : Sinh vin : Phm Vn KhangGio vin hng dn : L Th L Page 5Khoa Cng Trnh Thu BTLmn hc Nn v Mng % 45 , 48 100 .1 94 , 094 , 0100 .1++e en- Trng lng ring ca ht :) / ( 64 , 2 .2cm KG n h - Trng lng y ni:845 , 094 , 0 11 ). 1 64 , 2 (1). 1 (++ e ndnM um nn p ( M um bin dng ca t)qc=0,51(mPa)=51(T/m2) E = cq . ( vi t ct5 , 6 5 , 4 ), y chn 5 , 5 ,E=5,5.51=280,5(T/m2)4- L p 4 : S hiu 13 c cc ch tiu c l sau:Thnh phn ht(%) tng ng vi c ht qc (Mpa)W(%)NHt si Hat ct Ht bi Ht st>1010-55-22-11-0.50.5-0.250.25-0.10.1-0.050.05-0.010.01-0.021 >0,5 >0,25>0,1 >0,05>0,01Tch ly19%49,9%65,1%77,3%87,4%95,5%Ta thy hm lng ht c d > 0,5m chim hn 50%

y l lp ct th.Theo kt qu xuyn tnh ta c : qc= 9,6(MPa)cq =960 (T/m2) = 96 (KG/cm2)Sinh vin : Phm Vn KhangGio vin hng dn : L Th L Page 6Khoa Cng Trnh Thu BTLmn hc Nn v Mng Vy 50 < qc < 150 Trng thi ca t l trng thi cht vaTra bng I-3 sch bi tp c hc t 7 , 0 55 , 0 eVy c e = 0,625C:w=2,64.1.(1+0,197)/(1+0,625)=1,95M um nn p: chon2 E=960.2=1920(T/m2)Tra bng vi qc= 960(T/m2) Ta c kt qu tr a cht nh sau:

Ct phadoct thch?tv?astphanhoCt phadoCtthch?tv?a4. xut phng n mng.- Cng trnh c ti trng kh ln, c bit l lch tm ln- Chn gii php mng cc i thp : +) Phng n 1 : dng cc BTCT 30x50cm, i cc t vo lp 1, mi cc h su xung lp 2 khong 3-5m. Thi cng bng phng php ng.Sinh vin : Phm Vn KhangGio vin hng dn : L Th L Page 7Khoa Cng Trnh Thu BTLmn hc Nn v Mng +) Phng n 2 : dng cc BTCT 3050cm, i cc t vo lp 1, mi cc h su xung lp 3 khong 2-4m. Thi cng bng phng php ng.- y chn phng n 1.Qua lt ct a cht ta thy lp 2 l lp ct th . C th dng mng cc i thp cc thng hoc cc xin. Tuy nhin, trong n ny ta chn phng n mng cc i thp cc thng. 2.2Chn loi, kch thc ca i cc v ca cc1 . Chiu su chn y i.min0, 7.dh h Cng thc: min0, 7 (45 )2Qh tgb Trong :+)Chn s b chiu rng mng b = 2(m)+)Dung trng t nhin ca lp t t i; =1,93(T/m3)=19,3(kN/m3)+) Gc ma st trong: =19,50 +) Tng cc lc ngang:25,82( )tcxQ Q KN Ta c :min19, 5 25,820, 7. (45 ) 1, 28( )2 1, 93.2h tg m min0, 7. 0, 7.1, 28 0,896( )dh h m Vy ta chn chiu su chn i l hd= 1,2 (m)2.Chn kch thc i cc v cc.Ti trng tc dng xung mng rt ln ta dng cc cm vo lp ct th. y i t ti ct 1,2 m. dng lp lt b tng dy 10 cm mc 75.Chn chiu di cc bng 8m t y mng cm vo tng ct th, chn kch thc cc: 0,3 x 0,3 m,b tng M200, u cc c mt bch bng thp . cc c h xung bng phng php ng cc bng ba diesel khng khoan Sinh vin : Phm Vn KhangGio vin hng dn : L Th L Page 8Khoa Cng Trnh Thu BTLmn hc Nn v Mng dn.v mng chu m men kh ln nn ta ngm cc vo i bng cch hn vo mt bch u cc 4 on thp 16AII mi ondi 50cmvchnuccvoi 10cm. Thp dc chu lc gm416AII. 2.3.Xc nh sc chu ti ca cc:1. Theo vt liu lm cc:S liu: - B tng mc 200 c Rb= 90(kG/cm2) - Thp AII 16Cng thc: ) (a a b b vF R F R P + Trong Rb l cng chu nn gii hn ca b tng Ra l cng chu nn gii hn ca ct thpTa c:+) H s un dc 1 +) ) / ( 90002m KN Rb +)) / ( 2700002m KN Ra +):aFdin tch ct thp, 4 28, 04.10 ( )aF m+)bF: din tch phn b tng , 4 20, 3.0, 5 8, 04.10 0,149( )b c aF F F m Thay cc gi tr trn vo ta c: 41.(9000.0,149 270000.8, 04.10 ) 1558, 08( )vP KN + 2. Sc chu ti trng nn ca cc ma st:Do mi cc khng t ln 1 trong 3 lp t :- cng- Ct ln si cui trng thi cht-St cng.Nn cc lm vic theo s cc ma st.Sc chu ti ca cc theo t nn xc nh theo cng thc sau : ) . . . . . (+ nii i fi R dl f m u F R m m PSinh vin : Phm Vn KhangGio vin hng dn : L Th L Page 9Khoa Cng Trnh Thu BTLmn hc Nn v Mng Trong : m: h s iu kin lm vic ca cc trong t. Ly m=1F:dintch tit din ngang chn cc, F= 0,3.0,5= 0,15 (m2)u: chu vi tit din cc, u=( 0,3 + 0,5).2=1,6 (m)R: cng tnh ton ca t di chn cc Kpa( tra bng 5.2) i vi ct th c cht trung bnh, H=7,2m R =7433,333(KPa)li: chiudi lp t th i tip xc vi cc.fi: cng tnh ton lp t th i theo mt xung quanh cc Kpa. mR,mfi: h s iu kin lm vic ca t, k n nh h-ng ca phng php thi cng cc i vi cng tnh ton ca t di mi cc v xung quanh cc. Tra bng 6.3 theo iu kin ng cc ta c mR= 1 ; mfi= 1. Sinh vin : Phm Vn KhangGio vin hng dn : L Th L Page 10Khoa Cng Trnh Thu BTLmn hc Nn v Mng 12340,0-5,7-11,3-21,711,21110,5111,72,73,74,75,456,27,2Tin hnh xc nh Pd bng cch chia mi lp t thnh nhiu lp2mLp tzi(m)a cht fi(KN/m2)li(m)mfi2. ( / )i if lKNm1 1,7 Ct pha,Il=0,2830,3 1 1 30,31 2,7 Ct pha,Il=0,2836,04 1 1 36,041 3,7Ct pha,Il=0,2839,98 1 1 39,981 4,7 Ct pha,Il=0,2842,54 1 1 42,541 5,45 Ct pha,Il44,1 0,5 1 22,05Sinh vin : Phm Vn KhangGio vin hng dn : L Th L Page 11Khoa Cng Trnh Thu BTLmn hc Nn v Mng =0,282 6,2 Ct th cht va58,4 1 1 58,42 7,2 Ct th cht va60,4 1 1 60,4Vy:( ) 1. 1.7433, 333.0,15 1, 6.289, 71 1578, 536dP + (kN)( ) 1578, 536dP KN Vy ta c sc chu ti ca cc theo t nn l :=> Pd= 1578,536 / 1,4 = 1127,526(KN)Sc chu ti ca cc l: P = min(Pv; Pd) = 1127,526 (KN)2.4S lng cc trong mngTi trng mc y i: ( )00514, 6( )28, 4( )465,1ttttttoN KNQ KNM KNmp lc tnh ton do phn lc u cc tc dng ln y i:Ptt='22 21127, 5261392, 007( / )(3. ) (3.0, 3)dPKNmd Din tch s b y i:2) 0514, 60, 35( ). . 1392, 007 20.1, 2.1,1ttd tttbNF mP h n Trng lng tnh ton s b ca i v t trn cc bc:. . . 1,1.0, 35.1, 2.20 9, 24( )ttd d tbN n F h KN Lc dc tnh ton xc nh n ct i:0514, 6 9, 24 523, 84tt tt ttdN N N KN + + '523, 840, 431227, 821ttcdNnP cc tin cho vic tnh ton chn s lng cc ti thiu n'c = 4 cc do momen lch tm ln. T iu kin khong cch gia cc cc ta chn c kch thc i nh sau :1,4 x 1,7 m. Din tch i thc t: 'dF = 1,4 . 1,7 = 2,38m2Sinh vin : Phm Vn KhangGio vin hng dn : L Th L Page 12Khoa Cng Trnh Thu BTLmn hc Nn v Mng Trng lng tnh ton ca i v t trn i:'. . . 1,1.2, 38.1, 2.20 62, 832( )ttd d tbN n F h KN Lc dc tnh ton xc nh n ct y i:Ntt = 514,6 + 62,832 = 577,432KNMmen tnh ton xc nh tng ng vi trng tm din tch tit din cc cc ti i:0 0. 465,1 28, 4.1, 2 499,18( )tt tt tty y xM M Q h KNm + + 0 0. 14 2.1, 2 16, 4( )tt tt ttx x yM M Q h KNm + + Lc truyn xung cc dy bin:, 'maxmaxmax ,min2 21 1..c ctttt tty tt xn nci ii iMxMy NPnx y t t Vi nc: s cc trong mng

ix:khong cch t tim cc i n trc y

iy: khong cch t tim cc i n trc x( )( )max2 2577, 432 499,18.0, 6 16, 4.0, 45361, 4614 4.(0, 45)4. 0, 6ttP KN + + ( )( )min2 2577, 432 499,18.0, 6 16, 4.0, 4572, 7454 4.(0, 45)4. 0, 6ttP KN Pmin0 < Khng tha mn iu kin Ta tng s lng cc ln n'c = 6 cc . T iu kin khong cch gia cc cc ta chn c kch thc i nh sau :1,9 x 3,1 m. Din tch i thc t: 'dF = 1,9. 3,1= 5,89m2Trng lng tnh ton ca i v t trn i:'. . . 1,1.5, 89.1, 2.20 155, 496( )ttd d tbN n F h KN Lc dc tnh ton xc nh n ct y i:Ntt = 514,6 + 155,496 = 670,096KNMmen tnh ton xc nh tng ng vi trng tm din tch tit din cc cc ti i:499,18( )ttyM KNm 16, 4( )ttxM KNm Sinh vin : Phm Vn KhangGio vin hng dn : L Th L Page 13Khoa Cng Trnh Thu BTLmn hc Nn v Mng Lc truyn xung cc dy bin:, 'maxmaxmax ,min2 21 1..c ctttt tty tt xn nci ii iMxMy NPnx y t t Vi nc: s cc trong mng

ix:khong cch t tim cc i n trc y

iy: khong cch t tim cc i n trc x( )( )max2 2670, 096 499,18.1, 3 16, 4.0, 7111, 0846 6(0, 7)4. 1, 3ttP KN + + ( )( )min2 2670, 096 499,18.1, 3 16, 4.0, 711, 786 6(0, 7)4. 1, 3ttP KN ( )max min111, 084 11, 7861, 4322 2tt tttttbP PP KN+ + Trng lng tnh ton ca cc:Pc=0,3.0,3.6,9.25.1,1= 17,078(KN)=> max111, 084 17, 078 128,162( )ttcP P KN + + < 1227,821 (KN) = P nh vy tho mn iu kin lc ln nht xung dy cc bin.v Pttmin = 11,78 (KN) >0 (Tha mn)S b tr cc trong mt bng:

YX

Sinh vin : Phm Vn KhangGio vin hng dn : L Th L Page 14Khoa Cng Trnh Thu BTLmn hc Nn v Mng 5:Kim tra nn mng c ma st theo diu kin bin dng: ln ca nn mng cc c tnh theo ln ca nn khi mng qui c : = 4tb1 1 2 21 219, 5 .4, 5 42, 5 .3, 429, 44, 5 3, 4o ootbh hh h + + + + = 7,35o

Chiu di khi y qui c:Lm= 2,6 + 2. 0, 32 + 2. 6,8. tg(7,350)= 4,654(m)B rng ca y khi qui cBm= 1,4 + 2. 0, 32+ 2.6,8.tg(7,35o)=3,454(m)Chiu cao khi mng qui c :Hm= 7,2 (m)* Trng lng khi mng qui c c tnh nh sau :+, Phn tnh t i ln :1. . . 4, 654.3, 454.1, 3.20 417, 948( )tcm m tbN LB h KN +, Trng lng lp t ct pha (lp 1) phi tr i phn cc chim ch( )2. . .(4, 654.3, 454 0, 3.0, 3).4, 5.19, 3 1388, 29( )tcM M c IIN B L F hKN Tr tiu chun trng lng cc 30x30 cm di 8m:8.0,3.0,3. 25 = 18 KNTrng lng ca cc trong phm vi lp ct(lp 1):18.3.6 40, 58KN +,Trng lng khi qui c trong phm vi lp ct th(lp 2) cha k n trng lng cc: 3(4, 654.3, 454 0, 3.0, 3).3, 4.19, 3 1031, 54( )tcN KN Trng lng 6 cc trong phm vi lp st pha:18.3, 4.6 52, 467KN Sinh vin : Phm Vn KhangGio vin hng dn : L Th L Page 15Khoa Cng Trnh Thu BTLmn hc Nn v Mng

12340,0-5,7-11,3-21,7

Trng lng khi mng qui c:tcquN =417,948+1388,29+40,5+1031,54+52,46 =2878,278(KN)Ti trng thng ng tnh ti mng y khi mng qui c:Ntc = 467,82 + 2878,278= 3346,098(KN) Mmen tiu chun tng ng trng tm y mng qui -c: Mytc = Myotc + Qxotc.8,1= 422,82+25,82.9,1=657,782(KNm)Mxtc = Mxotc + Qyotc.8,1=12,73+1,82.8,1=29,292(KNm) lch tm : eL= 657, 7820,196( )3346, 098tcytcMmN Sinh vin : Phm Vn KhangGio vin hng dn : L Th L Page 16Khoa Cng Trnh Thu BTLmn hc Nn v Mng eB = 29, 2920, 0088( )3346, 098tcxtcMmN p lc tiu chun y khi mng qui c :maxmin6. 6. 3346, 098 6.0,196 6.0, 00881 . 1. 4, 654.3, 454 4, 654 3, 454tctc L Bm m m me e NLB L B _ _ t t t t , ,=> 2max2min263, 94( / )152, 376( / )tctcKNmKNm2 max min208,158( / )2tc tctctbKNm + Cng tnh ton ca t y khi mng qui c:( ) ) ( . . 3 . . . 1 , 1 . . . 1 , 1.' ' 2 1KN C D H B B AKm mRII II m II mtcm+ + Vi:Ktc=1 v ch tiu c l ca t ly theo s liu th nghim trc tip i vi t.Tra bng vi lp t t mng l lp ct th (lp 2) c II=42,50 c:A=2,995; B=12,995; D=13,0675m1=1,2; m2=1 319, 3( / )IIKNm ' 35, 7.19, 3 3, 4.19, 319, 3( / )5, 7 3, 4IIKNm + +( )21, 2.11,1.2, 995.3, 382.19, 3 1,1.12, 995.9,1.19, 3 3.13, 0675.0 2725, 584( / ))1mR KNm + + 1,2.Rm=3270,7(KN/m2)Tho mn iu kin :max1, 2.tcmtctb mRRVy c th tnh ton ln ca nn theo quan nim nn bin dng tuyn tnh * Tnh ng sut bn thn: Ti y mng qui c:

25, 7.19, 3 3, 4.19, 3 175, 63( / )btKNm + Tnh ng sut gy ln ti y mng : 20208,158 175, 63 32, 528( / )gl tc btz tbKNm Sinh vin : Phm Vn KhangGio vin hng dn : L Th L Page 17Khoa Cng Trnh Thu BTLmn hc Nn v Mng Chia t nn di y khi qui c thnh nhng on Bm/5=0,6908 (m)Bng tnh ng sut gy lnim su(z)Lm/Bm2z/Bm Ko0 0 1,35 0,00 1 32,5281 0,6908 1,35 0,4 0,971 31,6372 1,3815 1,35 0,8 0,8435 27,4833 2,0724 1,35 1,2 0,6745 21,977Gii hn nn ly n im 5 c z = 2,0724 m k t y khi qui c. ln ca nn :5 51 10, 8. .0, 8.0, 6908 32, 528 21, 977. 31, 637 27, 48326800 2 2gli zi ii iiS S hE _ + + + , =0,0019(m)Vy ta c: ( ) ( ) ( )510, 0019 0,19 8iiS S m cm cm < Tho mn iu kin bin dng.Sinh vin : Phm Vn KhangGio vin hng dn : L Th L Page 18) / (2m KNglzKhoa Cng Trnh Thu BTLmn hc Nn v Mng

a db c32,528(KN/m2)31,63727,48321,97717,79315,35 7,88* Tnh ton kim tra mng cc i thp1,Tnh ton v kim tra i cca, Kim tra chiu cao mng theo iu kin chu ctChn b tng mc: M200 c 229000 /750 /nkR KNmR KNm 'Gi nh chiu cao i h= 0,7m 00, 7 0,1 0, 6( ) h m iu kin mng khng b ph hoi bi lc ct: Q . .k oR b hKhi tnh theo 1 n v theo b rng mng: 1. .tto k op C R h T chiu cao lm vic ca i cc l:

1.ttookph CRTrong :Sinh vin : Phm Vn KhangGio vin hng dn : L Th L Page 19Khoa Cng Trnh Thu BTLmn hc Nn v Mng Rk- Cng chu ko ca b tngttop - p lc tnh ton trung bnh trn phn C11 max2tt ttttop pp+Ti chn ct ta v 1 gc 45oso vi phng thng ngC10.6pppmaxtt1ttmintt452188,151( / )ttp KNm 2 1 max88,151 111, 08499, 618( / )2 2tt ttttop pp KNm+ + C1=0,6(m)99, 618.0, 6 0, 08( )750oh m Vy chn 0, 6( ) 0, 6 0,1 0, 7( )o mh m h m + b,Tnh ton chc thng. Kim tra chc thng cho i cc theo cng thc :Nct tb kb h R . . 75 , 00Trong :ctN- lc gy m thng bng tng phn lc cc u cc nm ngoi phm vi y thp chc thng mt pha cnh di ca i cc.Sinh vin : Phm Vn KhangGio vin hng dn : L Th L Page 20Khoa Cng Trnh Thu BTLmn hc Nn v Mng , 'maxmax3 ,62 21 1..c ctttt tty tt xn nci ii iMxMy NPnx y + t ( )( )32 2670, 096 499,18.1, 3 16, 4.0, 6212, 2346 6(0, 6)4. 1, 3ttP KN + + 3 6212, 234 203,123 415, 357( )tt ttctN P P KN + + Ta c: 02. 0, 3 2.0, 6 1, 5c db h m b + + ( ) / 2 (0, 3 1, 5) / 2 0, 9( )tb c db b b m + + 0,75.9000.0,6.0,9 =3645(KN)> 467,82( )ctN KN Vy mng tha mn iu kin chc thngTnh ton ct thp cho i cci tuyt i cng coi i nh mt conson ngm ti mp ct.M men tng ng vi mt ngm I-I( )6 3P P r MI+ : ( ) 1, 05 r m l khong cch t ngm n tim cc 3 v cc 6( ) ( )3 6212, 234( ), 203,123( )1, 05. 212, 234 203,123 436,125 .IP KN P KNM KN m + ( )20436,1250, 0030, 9. . 0, 9.270000.0, 6IIMFa mRa h Chn 15 16 c( )20, 003015 Fa m Khong cch gia 2 tim ct thp cnh nhau l: 0,11mChiu di mi thanh l: 3,05mM men tng ng vi mt ngm II II( ) ( ) ( )2 1 2 30, 55. 11, 78 112, 007 212, 234 184,812IIM r P P P KNm + + + + ( )20184,8120, 0130, 9 . . 0, 9.270000.0, 584IIIIMFa mx Ra h Chn 15 10 c 20, 0011775( ) Fa m Khong cch gia 2 tim ct thp cnh nhau l: 0,2mChiu di mi thanh l :1,65mSinh vin : Phm Vn KhangGio vin hng dn : L Th L Page 21( )( )6 2 2670, 096 499,18.1, 3 16, 4.0, 6203,1236 6(0, 6)4. 1, 3ttP KN + Khoa Cng Trnh Thu BTLmn hc Nn v Mng Kim tra vn chuyn , cu lp ccChiu di thc t ca cc:( ) 8 L m Ti trng phn b u trn cc( Trng lng bn thn cc)( ) 0, 3.0, 3.25.1, 5 3, 375 / q KNm Khi kim tra vn chuyn : Chn a sao cho 1 1M M+ 0, 207. 0, 207.8 1, 656( ) a L m 2 21. 3, 375.1, 6564, 628( . )2 2q aM KN m Ta c s tnh , biu m men. Th hin trn hnh v di Khi kim tra cu lp: 2 2M M+ 0, 294. 0, 294.8 2, 352( )cb l m Tr s mmen dng ln nht:2 22. 3, 375.2, 3529, 335( . )2 2q bM KN m Tng t ta cng v c biu mmenKhi cu lp cc ln gi ng cc. Th hin trn hnh v di Gi tr m men ln nht m cc phi chu( )max 2 19, 335 . 3, 375( . ) M M KN m M KN m > Ly lp bo v ct thp cc l 3cm chiu cao lm vic ca ct thp l:30 3 27oh cm 2 2 29, 3350, 0000142( ) 1, 42( )0, 9. . 0, 9.0, 27.270000ao aMF m cmh R Ct thp dc chu mmen un l 416(2 28, 04( ) 1, 42( )aF cm cm >Vy cc kh nng chu lc khi vn chuyn, cu lp.Sinh vin : Phm Vn KhangGio vin hng dn : L Th L Page 22Khoa Cng Trnh Thu BTLmn hc Nn v Mng a aq MS t nh vn chuyn ccS t nh cu l p ccq bM11MM22Sinh vin : Phm Vn KhangGio vin hng dn : L Th L Page 23Khoa Cng Trnh Thu BTLmn hc Nn v Mng Sinh vin : Phm Vn KhangGio vin hng dn : L Th L Page 24