N NN MNGGVHD : Ts. L TRNG NGHA SVTH: NGUYN VN LONGTrang 23 : THIT K MNG CC I.THNG K S LIU A CHT 1.Tnh ton cho lp t th 1:Lp ny c 1 mu th: (1-1) Do s lng mu th < 6 nn khng dng phng php loi tr m ly gi tr tiu chun thit k. Cc ch tiu vt l c bn: a)Trng lng ring ( KN/m3):316.8 /tt tcKN m = =b) m W (%): w w 38.82%tc tb= =c) Gii hn nho WL :w w 45.5%tc tbL L= =d) Gii hn do WP:w w 25.6%tc tbP P= =e)Ch s do IP (%):19.9%tc tbP PI I = =f) st IL : 0.66tc tbL PI I = =g) T trng ht GS:27.2tc tbS SG G = =h)Tnh ton gi tr c, :

S HIU MU 2( / ) KN m o2( / ) KN m t1-1 5019.4 10027.2 15030 20039.5 Dng hm LINEST trong bn tnh Excel tnh ton gi tr c, 0.12613.250 0.0172.382 0.9631.945 52.6182.000 199.0817.567 N NN MNGGVHD : Ts. L TRNG NGHA SVTH: NGUYN VN LONGTrang 24

20 'tantantan13.25 /tan 0.126 arctan 7 110.0172.3822.3820.17913.250.0170.135tan 0.126tctc tc tcccC tctcC KN mVCV oooo == = ==== = == = = S bc t do: n 2 = 4 2 = 2 - Tnh theo trng thi gii hn I: Vi0.95 o =v n 2 =22.92Ito = | || |tan0 ' 0 '* 2.92*0.179 0.523*(1 ) 13.25*(1 0.523) 6.32 20.18* 2.92*0.135 0.394tan tan *(1 ) 0.126*(1 0.394) 0.076 0.1764 21 9 59CI I Ctt tcI I CII Itt tcI I IIt vC Ct vo o = = == = = = = == = = ( = - Tnh theo gii hn th II: Vi0.85 o =v n 2 =21.34IIto =

| || |tan0 ' 0 '* 1.34*0.179 0.239*(1 ) 13.25*(1 0.239) 10.08 16.42* 1.34*0.135 0.181tan tan *(1 ) 0.126*(1 0.181) 0.103 0.1495 53 8 29CII II Ctt tcII II CIIII IItt tcII II IIIIt vC Ct vo o = = == = = = = == = = ( = 2.Tnh ton cho lp t th 2:o)Trng lng ring (kN/m3) LP 2 DUNG TRNG T NHIN T (KN/m3) STT S hiu mu (KN/m3), i-tb |(i-tb)2 Ghi ch 11-216.8 0.2330.054 Nhn 21-317.3 0.2670.071 Nhn 31-417 0.0330.001 Nhn =51.1 = 0.126 =tb 17.03 kN/m3= o 0.251 v= 0.015 92 . 21 =ot => 0253 . 0392 . 2 015 . 01= =x] 6 . 16 46 . 17 [ ) 0253 . 0 1 ( 03 . 17 ) 1 ( *1 = = = xtc tt (kN/m3)- Tnh theo gii hn th II: 85 . 0 = on-1= 3-1=2 =>34 . 11 =ot =>011 . 0334 . 1 015 . 01= =x] 84 . 16 21 . 17 [ ) 011 . 0 1 ( 03 . 17 ) 1 ( * = = = xtc ttII (kN/m3) N NN MNGGVHD : Ts. L TRNG NGHA SVTH: NGUYN VN LONGTrang 26 b) Trng lng y ni (kN/m3) LP 2 DUNG TRNG Y NI (KN/m3) STT S hiu mu (KN/m3), i-tb |(i-tb)2 Ghi ch 11-2 6.80.3000.090 Nhn 21-3 7.40.3000.090 Nhn 31-4 7.10.0000.0000 Nhn = 21.30.180 =tb' 7.10 kN/m3= o 0.3 v= 0.0422 92 . 21 =ot =>0711 . 0392 . 2 0422 . 01= =x] 6 . 6 6 . 7 [ ) 0711 . 0 1 ( 1 . 7 ) 1 ( * '1 = = = xtc tt (kN/m3)- Tnh theo gii hn th II: 85 . 0 = on-1= 3-1=2 =>34 . 12 =ot =>033 . 0334 . 1 0422 . 02= =x] 86 . 6 33 . 7 [ ) 033 . 0 1 ( 1 . 7 ) 1 *( ' ' = = = xtc ttII (kN/m3) c) m W % LP 2 M W % STT S hiu mu Wi %|Wi Wtb|(Wi Wtb)2 Ghi ch 11-2 53.63.39011.492 Nhn 21-3 46.873.34011.156 Nhn 31-4 50.160.0500.0025 Nhn =150.63 = 22.65 Wtb= 50.21%= o 3.365 V= 0.065 tc ='16 7o 5.2210.09356.2cctcCov = = = 0.0190.0660.289tgtgtgov= = =oTnhtheo TTGH I 0.95 o =S bc t do n-2 = 28-2=26 1.71 to =0.093 1.71 0.159C cto u = = = 0.066 1.71 0.113tan tan (1 ) 0.289 (1 0.113) 0.256 0.322tgItt tct o u= = == = = tantc =0.289 tcC =56.2 tgo =0.019064 co =5.221027 0.89835711.27871 229.797426 29232.353307.44 2(1 ) 56.2 (1 0.159) 47.26 65.14( / )Itt tcC C KN m = = = N NN MNGGVHD : Ts. L TRNG NGHA SVTH: NGUYN VN LONGTrang 48 ' o '14 21 17 50I ott( = oTnhtheo TTGH II 0.85 o =S bc t do n-2 = 28-2=26 1.06 to =0.093 1.06 0.0986C cto u = = = 0.066 1.06 0.0699tan tan (1 ) 0.289 (1 0.0699) 0.269 0.309tgIItt tct o u= = == = = ' o '15 3 17 10II ott( = | || |tan0 ' 0 '* 1.34*0.899 1.205*(1 ) 10.35*(1 1.205) 0 22.82* 1.34*0.085 0.114tan tan *(1 ) 0.398*(1 0.114) 0.353 0.44319 26 23 53CII II Ctt tcII II CIIII IItt tcII II IIIIt vC Ct vo o = = == = = = = == = = ( = Lp ti Lngn VGi tr tiu chun Gi Tr Tnh Ton Theo TTGH ITheo TTGH II MinMaxMinMax 1 KN/m316.8 'KN/m37.7 W %38.82 WL % 45.5 WP % 25.6 GSKN/m3 27.2 CKN/m2 13.25 6.3220.1810.0816.42 7011' 4021'9059'5053'8029' 2 KN/m317.0316.617.4616.8417.21 'KN/m37.16.67.66.867.33 W %50.21 WL %47.6 WP %31.3 GSKN/m326.7 CKN/m27.356.1668.5336.637.07 2(1 ) 56.2 (1 0.0986) 50.66 61.74( / )IItt tcC C KN m = = = N NN MNGGVHD : Ts. L TRNG NGHA SVTH: NGUYN VN LONGTrang 49 4034'3036'5033'400'508' 3 KN/m31918.6619.3418.8419.15 'KN/m39.38.789.819.069.53 W %29.22 WL %50.53 WP %26.73 GSKN/m327.3 CKN/m235.524.9646.0329.0941.9 13054'11033'15043'12023'14055' 4 KN/m318.9 'KN/m39.4 W %25.88 WL %29.2 WP %22.5 GSKN/m326.9 CKN/m210.35037.52022.82 21042'16039'26023'19026'23053' 5 KN/m319.7619.3120.219.4920.03 'KN/m310.119.5910.69.810.41 W %24.08 WL %45.3 WP %23.6 GSKN/m327.3 CKN/m256.247.2665.1450.6661.74 1607'14021'17050'1503'17010'