1、F1F2F3l1l2l3ABCD1ppt课件F1F2F3l1l2l3ABCDF1FN1)(kN2001N1N1 FFF2ppt课件F2F1FN2F1F2F3l1l2l3ABCD)(kN1502N2N21 FFFFFFN3)(kN5003NR3N FFFD3ppt课件FN2=-15kN（-）FN1=20kN（+）FN3=-50kN（-）15+-2050F1F2F3l1l2l3ABCD4ppt课件FN2=-15kN (-)FN1=20kN（+）FN3=-50kN(-)F1F2F3l1l2l3ABCD)(MPa.N 8 81761761 11 1AFAB)(MPa.N 6 674742 22 2AF
2、BC)(MPa.N 5 51101103 33 3AFDC 5ppt课件F1F2F3l1l2l3ABCDm102.534-N 1 11 11 1EAlFlABm101.424-N 2 22 22 2EAlFlBCm101.584-N 3 33 33 3EAlFlCD-0.3mm BCCDBllumm10-0.474-CDBCABADllll6ppt课件D+Me2Me3Me1180)2(pepe GIaMGIaM7ppt课件MPa7.69tmaxmax WT mkN292e M33.2180)23(pepe GIaMGIaMCBBACA D+Me2Me3Me8ppt课件BAFlx)0()()0(
3、)(SlxFxxMlxFxF 0SFA左左FFA 右右SFSxFFlxM9ppt课件2RRqlFFBA lqFFABx)0(222)()0(2)(2RRSlxqxqlxxqxxFxMlxqxqlqxFxFAA 10ppt课件)0(2)(SlxqxqlxF2SqlF 2SqlF +ql/2ql/2BlqFAxF11ppt课件)0(222)(2RlxqxqlxxqxxFxMA lqFABxF00 Mx，0,Mlx()d0d2M xqlqxx2lx 822maxqlMMlx+82qll/212ppt课件 lqFABxF+ql/2ql/2+82qll/282maxqlM2maxSqlF13ppt课件l
4、FABCabFFlFbFA RlFaFB R14ppt课件 xxlFABCabFRAFRB)2()0()()1()0()(SaxxlFbxMaxlFbxF )4()()()()()3()()()(SlxaxllFaaxFxlFbxMlxalFalblFFlFbxF 15ppt课件)1()0()(SaxlFbxF)3()()(SlxalFaxF xxlFABCabFRAFRB+lFblFa)4()()()(lxaxllFaxM )2()0()(axxlFbxM+lFba16ppt课件xxlFABCabFRAFRB+lFbalFblFa17ppt课件R AMFlR BMFl()()()S01MFx
5、xlllABCabFRAFRBM+Ml18ppt课件xxlABCabFRAFRBM()MM xxl)0(ax()()MMM xx Mlxll)(lxa CMaMl左左 0M CMbMl右右+MalMbl19ppt课件lABCabFRAFRBM+/M l+MalMbl20ppt课件lABxFmaxwmax 21ppt课件xlwABxF()()(1)M xF lx ()(2)EIwM xFlFx 21 (3)2FxEIwFlxC 2312(4)26FlxFxEIwxCC 22ppt课件21 (3)2FxEIwFlxC 2312(4)26FlxFxEIwxCC 0,0 0,0 xwxw120 0CC
6、22FxEIwFlx 2326FlxFxEIw 23ppt课件BwmaxmaxxlyAF（）222max|22x lFlFlFlEIEIEI max maxw（）3max|3x lPlwwEI 24ppt课件max maxwABq25ppt课件RR2ABqlFFABqFRAFRBx2()22qlqM xxx2346qlqEIwxxC 222qlqEIwxx 341224qlqEIwxxCxD26ppt课件233(64)24qlxxlEI 233(2)24qxwlxxlEI 0w xABqFRAFRB A B3max24ABqlEI wmax4max25384lxqlwwEI 27ppt课件AB
7、FDab28ppt课件RAbFFlRBaFFlFRAFRBABFDab12xx1R(0)AbMFxFxxal2()()bMFxF xaaxll29ppt课件11bFxEIwMl2112bxEIwFCl 31116b xEIwFC xDl30ppt课件22()bFxF xaEIwMl 2222()22bF xaxFEIwCl33222()66bF xaxFxEIwCDl31ppt课件12ww12ww10w 20w 120DD2212()6FbCClbl ABFDabl12FRAFRB32ppt课件22211()36FbwlbxlEI 22216FbxlwbxlEI2222221()()23Fbl
8、xawxlblEI b 33222()()6FblxxawxlblEI b 33ppt课件10()|6AxFab lblEI 2()|6Bx lFab lalEImax()6BFab lalEI34ppt课件0w 10w22211()036FbwlbxlEI 221(2)33lba abx1222 3max()0 06429 3x xFbPblw|lb.wEIlEI 35ppt课件222(34)0.062548CFbFblwlbEIEI1222 3max()0 06429 3x xFbFbly|lb.wEIlEI36ppt课件ABCD1.4m0.6m15kN10kN0.8mABFemkN15
9、6.0104.115e MkN25 F37ppt课件ABFMe+15kNm-20kNmmkN20max MmkN15 T)1(3243 DWMPa26.157223r WTM38ppt课件lFcr2l()2cr22EIFl Fcrl0.3l0.7l(.)2cr207EIFl Fcrl2cr2EIFl l 22cr)(lEIF lFcrl/4l/4l/2(/)2cr22EIFl l39ppt课件 22crlEIF 22cr)7.0(lEIF 22cr)5.0(lEIF 22cr)2(lEIF 22cr)(lEIF 40ppt课件scr ba cr22cr E cr Ps41ppt课件dF1.3
10、a BF1.6 aCaFA42ppt课件al22 al3.11 aal12.16.17.07.0 dF1.3 a BF1.6 aCaFA43ppt课件30mm20mmyz1p99E m0058.002.003.0)02.003.0(1213 AIiyy44ppt课件m0087.0 AIizz15.0 zy 30mm20mmyz11586 zzzyyyilil kN5.8922crcr zEAAF 45ppt课件FACD1.2m1.2mB30FFRAyFRAxFyxFNAB3002.14.230sin 0N FFMABAFFAB NFFFFFFAyyAxx5.00866.00RR 46ppt课件AFAFAx866.0R zzAyWFWF6.02.1Rmax MPa37.946.0866.0maxc zWFAFFACD1.2m1.2m30BFFRAyFRAxFyxFNAB3047ppt课件
