AaP/211aB223P/2PaPPCaaM=PaAqCBAaQ图(kN)PM=PaBCa30kNAB20kN/mDa/ 2a/ 2C1m1m1m3qa/8Q图+3q/8-qa/8qa/8P0-Q图(kN)10kN10+-2040kN20+QkN)+-Q图P+0P/2PaMkN·m)-MkN·m)PM图(kN·m)M图+20++
题8-1b 题8-2a 题8-2c 题8-3a 题8-4f
Paql8=409qa/1282qa/162PaM图(kN·m)+10-15
q=30kN/mDP=20kNq=30kN/mB2PAaCA1m4020+-30101mCE1m40B20kN·m50kN20kN·m20kNA1m5kN51mB10kN1m30+-2015-aPA2m2525CB2m25C1m25kN10Q图(kN)Q图P+-Q图(kN)+-252020-+50Q图(kN)+-1510+P3.75M图-(kN·m)3.7515-M图(kN·m)M图+M图(kN·m)+-10
题8-3b 题8-4a 题8-4b 题8-4c
q=20kN/m30kN·m20kNABDACBEC2m6m2m4m1m10010012.5kN6032.5kN40Q图(kN)++1020--Q图(kN)+40-6012.5M图1040401020(kN·m)--M图-+(kN·m)+9030题8-4d 题8-4e q=15kN/m15kN15kNABCDGHEF2m2m2m2m4m2m2m2m23.75kN55kN63.75kN7.5kN23.7522.518.75+7.5Q图(kN)++-+-6.25--7.536.2541.2537.545-M图(kN·m)-++30+30306060
题8-8
q=7kN/mB(a)A30O3.46mRB3m(d)N kN)(-)qx=3.5kN/mB12.1(b)A30=3.×3.5)(e)O(46(+)2qy=6.06kN/mB·m)9.1 8M kN(c)A30O 题8-5e
q=60kN/m250kN·m20CBm02267.525020kN·mM图(kN·m)A3m180kN题8-12a
2kN/mCBA4m-80Q图(kN)41616M图(kN·m)0-8N图(kN)题8-9b
20kNBCDm/Nk36.25kN01m3A30kN4m1m16.25kN20+-16.25+Q图(kN)30 题8-10a
45204511.25M图(kN·m)0+N图(kN)
4m16.25 CBm36020kND62kN6062.5m3A20kNM图(kN·m)38kN5m38+0-06283-02+Q图(kN)N图(kN)题8-10b
10kN·m8kN269.68kN3624CDEm/mN6k29M图(kN·m)AB4kNB3.6kN3m2m4.4kN题8-12b
20kN/m4080120DE40kN40kN·m40C800M图(kN·m)AB40kNAB4m30kN50kN 题8-13b
2m2m
q4l2ql24DCEq4l2ql28lqM图A3qlql4B4ABqlql4l4q4l--q4lqq4lq4lq4l4l+Q图+-N图-3qlBB4题8-15a
mmhM图m/hm/h题8-16a
lPPl2Pl2CPll2Pl2APB2PP2P2ll2M图-P2+P2+P2P2+-P2-P2Q图N图 题8-15b DCEPPaPPaPaPPa/2Pa/2Pa/2Pa/2aPABPP/2M图P/2aaaaPP0+P/2PPP-+2+P/P-PPP-P/2N图Q图P/2P/2P/2PPPP题8-16b
q=20kN/mDCmH2.1ABm1G4.37mF4.5m4.5m4.37m177.4kN(a)177.4kNq=20kN/mHCDCAVCF(b)NFG题8-25YFA177.4kNNNFDFANFGXFAF(c)CADH81.8+366.8-81.8357.6+357.6-81.8366.881.8F357.6BN图(kN)G(d )CADH15.415.4BF5151G4848M(kN·m) (e )