1、BS*Z3.物體在一個(gè)力系作用下，此時(shí)只能(4.圖示ABC桿，固定端A的反力是(=P, Y=0)7.關(guān)于軸力(A.AB桿為鑄鐵，CD桿為鑄鐵B.AB桿為鑄鐵，CD桿為低碳鋼C.AB桿為低碳鋼，CD桿為鑄鐵D.AB桿為低碳鋼，CD桿為低碳鋼面的直徑為D，正方形的邊長(zhǎng)為a，其慣性矩I=(ZD4 a4D41264D4 a4D461612)B.(b)D.(d)fBlC.=0,=0,=-70, =-703C.彈性范圍內(nèi)2080mABC1400Y AAACC1)A12-45613-963-910010 80 1016444qaqa3-8R af R =BBB3EIf R BBB7R = B64FAOOOA

2、AWWBBWBOOWW ABAFFOAOOOFABWAFBFBFWAAWFBFFFBBAOOWAWABFA AAAECCCWWDBWD BBAFACCBWBAAAEAEDCCCWWDBD BBWBBBAFACBCBWBB qABFCACDBBCAWWDACBFqDFAWB qBFBACBADBBCCAWWFDCqACBFFADBBAWDA 拱 。FFAFBCBWADDADBAAFACBDW BDBWCCFFFBCABBWADADDBABDACFAFAFBDFW BCBWFFBCFB 點(diǎn) A和B ， BAAPWBPAFDFBWW12EF CACBAO BDGCCWFFFABFWFACFCAAFA

3、BPBBCPPFFPBCFNFFB BBFWWWW1212AFAFCFCFFFFFAADDFFFCEECCBBFFFFFFEFEBBFGFABDAO BBDFGFFFBWF CFCCW FC 桿在CF 和F C12F F 12A143BC2 CyCx2 4F 0 F F F 0o53y12F 0 F F F 60 0o5x1F N F N與 FBA和D 2aBCaDA FBCFDAADD FFFF F FDADA5BC AB AC 2 115F F F F 1.12F22DA C oF45oABC45o FDE45oABFAFCB FdAeFFBcFFF BA115CE BD CDED CD2

4、CE2 5CE CD222CECDEDCD1F F 2010 kN2B5F F 2010.4 kN2ACECD45 arctan18.4oo 和 A和EF4BC668DAE 取F =FDEFDDEFE 取FBFAFDD3D43FAA15F F F F N23ADE B和CF 和F 12F 和F 12CBF2o1ADB、FFB45oFFFF11F 2FBC1 CC223F F cos30 Fo2223F F2F F2126F F For F F412221 在A ，0 和 DFF。00zAFBODyCx F 0 F cos45 F cos45 0ooxACABF 0 F F cos60 0oyA

5、DF 0 F sin60 F sin45 F sin45 0ooozADACAB6F 2F 1.2 kNF F F 0.735 kN4 c A和BMMl/2ABABllMl/2BAl BMl/2ABFlFABMM 0 F lM 0 F lBMlBF F AB BMl/3ABlFFABMlM 0 F lM 0 F BMlBF F AB BMFABAlFBM M 0 F lcos M 0 F lcosBBMF F lcosAB A和CaBaC3aMaA 取FBBCFCF FBC 取、BBFBMFAA2MMa M 0F aa M 0 F 0.354BB22 2aMF F 0.354aAC M ，1M

6、 。22ABFF50AB 、B M M M 0 F lM M 0 F 2 N1lB12BF F NAB M M 和F 21ABCM2M1O BFBFCCM2 M 0 F BCsin30 M 0oB2M1F 5 N2BCsin30 0.4sin30Boo ABBAF F F 5NABB AAOO0 0F OA MMA1 M F OA50.63 Nm1AO 和O O zO x1212F F F F N,112212A和BzF1O1BAyO2O2x2 B處xy M 0 F F 2r 0 x22rF 2205F 2.5 NF F 2.5 N2M 0 F F 2r 0z2rF 22031F 1.5 NF

7、 F 1.5 N1 2F F 1.5 2.5 8.5 N F222AAxAzF F 8.5 NBA MAMDClBAlll 取FMCCFBBMlF l M0 0MFCC 取DCCFDAFAFFADCFMlF 2Ccos45oA2ABCDq3ABC12ABDC ；y2ABxCDxF M (F)0: 2F 20ABF ByBF ；yq23ABxCx12M (F)0: F 332BAy0AyF 0: F 2oyAyB0F 4.24 kNB F 0: F F 0oxAxBF AxyxBDx F F 0 xAx0.820dxx8F 1.6202.40AB0F 21 kNBF 0: 0.820dxF F

8、200yAyB0F 15 kNAybBAD ；ybxBAGAyG F 0: -F Gsin 0 xAxF GsinAx F 0: F GG 0yF G)M (F)0: M F bGRGR0BAAyM G(1 bA A B 2C，DP1m 1mEBDPCOW5m ；1m 1mEPCOW5m 選F M (F)0: -F 2P1W 40FEPF W2E F 0EP W 和BA A PF 、CAllhaPDEBC；AyllhaPDExBCFCB ll M (F)0: -Q cosQ cosP 2la cosF 2lcos 022BCaF Q 1P2lC F 0: F F QP 0yBCaF Q P2l

9、B ；AyAlhQDDBB 選Al M (F)0: -F lcosQ cosF h02ABDalcos2hF Q PlD F Q知BFADQCFB ；AADx 選x F 0: -F F 0oxAQA ；AACCyFB M (F)0: F sin15 AC F BC 0oCAF 373.6 NMqADBCaaaa ；yMqDxCxaaM (F)0: -aqdxx M F 2a0CD0F 5 kNDF 0: F aqdxF 0yCD0F 25 kNC ；y qAxCBCBAxadxa M (F)0: F aaqdxxF a0CBA0F 35 kNAF 0: F aqdxF F 0yABC0F 80

10、 kNB C D 。3333CCABABDD634311 DF =F ；CD ；yx33CABDxAy4311B F 0: F 0 xAxF AxM (F)0: 10065qdxxF 60AB1F 120 kNBF 0: F 5qdxF 0yAyB1F 80 kNAy ；C3DD3 選CM (F)0: 3qdxxF 30CD0F 15 kND ；y3Cx3DABxAyD63B F 0: F 0 xAxF AxM (F)0: F 63qdxxF 35030BAyD0F 25 kNAyF 0: F 3qdxF F 0yAyBD0F 10 kNB 和E D A B C2m2mBADEW ；Cy2m2

11、mBAxDWEW F 0: F W 0 xAxF Ax M (F)0: F 4W r W 2r 0ABF B F 0: F F W 0yBF ；CFDWEW 選 D M (F)0: F W r Wr 0DCBF CB kN B800300EACDW600B ；y300EADW600WBBy M (F)0: F W0BAxF AxF 0: F F 0 xAxBxF Bx F F F W 0yAyBy ；CACDAyDy 選 DM (F)0: F F 0DCF 將 F F F W ByAy F 的 E F =，AFFEDCB B ；FFED45oB F BM (F)0: F F 0FF FM (F

12、)0: F F 0BF 2F ；yAxAyDDyBB M (F)0: F F 0ABF FB F 0: F F F 0 xAxBDxF FAxF 0: F F 0yF FzEhDyAMbBCaxzEhDyAMbFCWBCax M (F)0: M F 40zF Na2M (F)0: W F a 022xCF 707 NCb2M (F)0: F bW F b022yCF 02F 0: F F W F 02zCF 500 N2 4 02 5 F 0: F F xCF 400 N2 3 02 5 F 0: F F F yByAyCF 800 NAy F F B 。F160BDCA150100: ；FF

13、ByByDCz150 x100 M (F)0: F cos20 120 200100 800ozF 70.9 N M (F)0: F F 0oxF N M (F)0: F F 0oyBxF NBxF 0: F F F 0oxAxBx F 0: F F F 0oyF No N m F 及 B 。zz22BAMxEMEyx20oF20o: ；zAMxyFxEDFF20od M (F)0: F cos20 M 0o2yF 12.67 kNM (F)0: F F 0oxF ozF BxF 0: F F F 0oxF 0: F FAzF0BzFozF Az 題 圖 oo ffss F FWW f 0.3

14、8 tg30 0.577ofs 20.8 ofWf F f W Ns +FRFWWf ；WF sin 90 sin off sin F W82.9 Nfsin 90 of 重 N A N BB Cf f A F Ao B B FABC B和 C 當(dāng) BA30oA1FW1Asin sin 180 90 30oosinF W 209 Nsin 60 1Ao 當(dāng) C A與 B2ABC2FW2sinsin 180 oosinF W 234 Nsin 60 2o122B2F Wf2 2oF F12 BsADBBBfllCCPPAfF F DR和fllsin tan cos2f11tan 2tan 2ff

15、1arctan 190 arctanos45oMOGMG(-ff F GcosF Gsin441fR2f 取 ODD M (F)0: F F M 022O1fR2f4M2 fof f sf 與 在 G點(diǎn)鉸接。磚的重量為Ffb應(yīng)sb是 G。E3cm3cmBGFbDAW25cm arctan f arctan0.5ofs yWffRR 列 y F 0: 2F W 0yRfF WR 3cmBGFbRfA 取 G M (F)0: F sin 3F cos bF 9.50GRfRfb10.5 cm C 。yy101505012020010 xx8050 將 T S S C C ；1212yC2x50 y

16、x C S y 21C1S y 22C2Tx 0CS yy CiiSi 將 L S S C C ；1212y10120210 x80 S x 5 y 21C1C1S x y 522C2C2L12005700451200700S xiSx 19.74 mm39.74 mmiCi12006070051200700S yiy iSCi 。yy40C6020 xCOx3010030200100 S S C 和 C ；1212y22Ox200100 xy C S x 0C1221 x C2S 222 S xiSx iCiy 0C S S C 和 C ；1212y124016020 x3010030 yx

17、 C S y 21C1S y 22C2 x 0CS yiSy iCi FFFF 122FF1 取 1FFN11F 0 F F 0 F FxN1N1 取 22FF 0 F 0 F 0 xN2N2 F FNmax F1122FFRF 0 F 2F F 0 F FxRR 取 11FFN1F 0 F F 0 F FxN1N1 取 22FFN2RF 0 F F 0 F F FxN2RN2R F FNmax 112233 取 11FN1F 0 2F 0 F 2 xN1N1 取 1122FN2F 0 23F 0 F 1xN2N2 取 33FN3F 0 3F 0 F 3xN3N3 F3 kNNmax 1221

18、 取 11FN1F 0 21F 0 F 1xN1N1 取 22FN2F 0 1F 0 F 1xN2N2 F1kNNmax FNFxxFNFFFNxFNx F 與 F 與 12d 和 d 與 F 之12221FF21AB1C2 F FF F FN11N212 求 F103N114A1 21F F3 2N214A21 22F 62.5kN2 題 F F d 121 與 F FF F FN11N212 求 F103N114A1 21F103 N21A21 d 2242d 49.0 mm2 2角 = 0nFF FA 5 22F 5 2A F 1 2 d 與 d 12 A BC1200AF A 和 y4

19、50 xAF F 0 F sin30 F sin45 000 xF 0 F cos30 F cos45 F 000y22F F 41.4kNF F 58.6kN3131ACAB FF82.9MPa131.8MPaA1A2 1 2 AF d 。SWFlB1A2C A 和 yFFFxAF450FFF 2F ACF F AB FA50103 160MPad 20.0mm1Sd214FA70.7103 10MPabmmb2W2 。 題 F 。 由 、 F 22F ACFF ABF3131 2FFA31 160MPaF 154.5kN14d2112FFA31 F 14d222F 。 l =l AA 21

20、212。l2l1FFFABC F FF FN1N2 F l F l1010 400 1010 40033l l l N2 2N1 1EAEA20010 100 20010 501233120.2 mm 1 2A F 1 2 與 F-4-412 A=A E =E 。21212BC12300AF A 和 yFFxAFF 0F sin30 F sin30 F sin000 xF 0F cos30 F cos30 F cos000ycos 3sincos 3sinF FF F33 F A EA 16 kNF A EA 8 kNAB1111AC2222F 21.210.9o 題 與 A 與 A ，221

21、2桿 =m E GPaE GPaSWA F l 50 3l E A 200 13S1F 2l 70.7 23l E A10 23W212 AAl1A1l2A2 l 0.938mmA1f AAl (l l )tg 000A1221 F ABCDFFl/3l/3l/3 ABCDABFFF 0F F F F 0 xAB F FF F F F FN1AN2AN3B l l l 0ABBCCDF lF lF ll l l N1 N2 N3 F l/3(F F)l/3 F l/30AABF F F /3AB F2FFFN1N2A 3AA3Aly 1 2 ，2 l21aaBCDF 對(duì) N1N2BCDFm 0

22、F aF aF a 0BN1N2 l 2l21F lF l2F 2FN2N1N2N124F FF F55N1N2 F250103530066.7 160 N1A12F4501035300133.3 160 N2A 2 3 ，1 E E E 。23123 A A A 123231CF C N2FN3N1CFF 0F F cos30 00 xN1N2F 0F F sin30 F 00yN3N2 F lF lcos30F lF l0l l N2 2N1 1N1N2E A1602AE A 1002A121122F l F lsin300l N3 3N3E A200A333 l1CC1l2Cl23C3l

23、 l (l l )000322115F 32F 8F 0N1N2N3F kNF 26.13kNF 146.94kNN1N2N312 3 FFFA 1N283mmA N436 mmA N1225 mm23123A A 2A 2450 mm123 FFFF100100F F501035 MPaQA 100100s F 5010312.5MPabA 40100bsb F 與 F B F F ，1212 。A14080DdB450C2610 6D BF F F 2F F cos45 35.4 kN21220B12 BFFB2d 15.0 mmQ1Ad2S4 BFF d 14.8 mmbBA d10b

24、d F bFFFFd 14FFA99.5 MPa 120 MPaQS1d24 1FF 4 bAdb 12444bF412NF44x 3FF4 N1A (bd11 FF125 MPa 160 MPaN1A (bd11 aaaaMMMM300300300500500500 122MM1 取 11T1xMM 0 T M 0 T Mx11 取 22T2xM 0 T 0 T 0 x22 M MTmax 122MAxMM1M 0 M 2M M 0M MxAA 取 1T1MxA1M 0 M T 0T M MxA11A 取 2T2xM2M 0 MT 0T Mx22 T Mmax 31223 1 取 1T1x1

25、M 0 2T 0T 2 1x1 取 22T2xM 0 21T 0T 1x22 取 3T3x3 M 0 2T 0T 2 3x3 T 2 kNmmax 123 取 12 31T1x1M 0 1T 0T 11x1 取 1122T2xM 0 12T 0T 3x22 取 1123T3x2 3M 0 123T 0T 03x3 T 3max TMxTMxMTxTx r/min( 1 P 13 4 P P =P 。234 1 3PPPP34122134800800800 P1M M 318.3 M M n1234 xT 1273.4 kNmmax 1 xT 955 kNmmax 徑 矩 A A AA I (D

26、 d ) 4454p T110 15663.7 MPaAI2.356105AT110 20684.9 MPaI2.356105T110 10642.4 MPaI2.356105 與 d 與 d d d 1212 C。MMCBAll TMMx T2M2M13.5MAB11 4dWdABmax3d( )313pAB21616 3TM16MBC1WdBCmax3d32pBC21616Md32 求 CT lT l2Ml1 4d Ml16.6Ml 1GIGIGdC44G d32G 2422323 題 0 2M2110 16680d 50.3mm1dAB31d31116M110 16680d 39.9mm

27、21d32d3216 M1800210 32 1806010 0.5 d 73.5mmTABpAB3GI8010 dAB3411M1800110 32 1806010 0.5 d 61.8 mmTBC3GI8010 dBC3422pBC d 73.5mm1d 61.8mm2 B B MMABCa2a MBAABC0 M M M0MxAB 求 T MABT M MABCA M M 2a32M a00AAG dG d4421M MM M33AB M ；32M ad 4M ABG d64a4B FeCCBBAA(a)qFCCBAABab(c)(d) 取 A+FAF FM 0SAA 求 C取 CFCC

28、F FM 2C 求 B- B-FABCBF FM FlSBB 求 BMeCBARRABMlR R eAB 求 A +取 A +MeMAFRAMF R M MelSAAAe 求 C取 CMeCMCAFRAMl MF R M M R eel22AAeA 求 B取 BFBMBRBMF R M 0elBB 求 BFCBARRBAR R a ba bAB 求 A +取 A +AAF R M 0a bSAAA 求 C-取 C-CAAF R M R a a ba bACA 求 C +取 C +CBBF R M R ba ba bBCB 求 B-取 B-BBF R M 0a bBB 求 A +取 A +qFA

29、CBl F q 2 2l l2M q 2 48SAA 求 C-取 C-qBCl l l2F q M q 2 22 48C 求 C +取 C +qBCl l l2F q M q 2 22 48C 求 B-取 B-BF 0 M 0SBBqFCBABAl22(d)(c) 2F1CBAARCR FR 2FAC F F (0 x l/2) M Fx(0 x l/2)S11111 F F (l/2 x l) M F lx(l/2x l)S21221 FSFxxFM2qBAx qllF qx q( x) (0 x l)44SqlqM x x(0 x l)2421 SxM2(+)x/4 F FFABAB333

30、22(b)(a) ABAB555 554444(d)(c) MMxx(a)(b)MMxx(c)(d) qFABAB(a)(b)qq2qBBAAqqBBAA333 FBABBR FM 2FlBB SFxxM2 BAAAR 0 M 0AA S2xx2M2 qqBAABR R 4AB S44xx4M2 2 q2BAAB9R R 88AB S8xM2x qBAABR R 4AB S4x4M2x 222 qBABA10R R 99AB S99x99M22x F 與 F F F 1212 KF1zy M)x M 7.5 kNmax 106MM 240802WZ66KM y M y 6 340803IKZ

31、MM0bzCy y 20.3mm0b79 mmI 176 cm4z Mby80(7920.3)1032.67 MPa0176108maxIx My 8020.310300.92 MPaI176108maxx q C 底 -4。qCBAaaBA 31R R 44ABS4x(-)4M 22x C E 49Cmaxqa2MW4CWCzz 9qa2M98 WWCzz M e+- FACCy A y A y (150250)125(100200)150y C296 mm112A A(150250)(100200)1233I zC(y 2(150y )22CC 48 M(+)x A +M (250y )

32、4010 (25096)660.4MPaCAI1.02108AzCM y4010 96637.6MPaACI1.02108AzCA-M (250y ) 3010 (25096)645.3MPaCAI1.02108AzC F q 。 。bFqABbRAB R 3.75kNm R 11.25kNmABMx 3.7510 3.7510M 16066MPa4b3Wbh2z66b F FABBA R 5 kNm R 25 kNmABMx 106M WWW cm3 F 。FCDABBA 當(dāng) F M(+)xF /2M WWF W M(+)x3F FaM24max,2max,2WWa m F 與 F F F 1212 ； zbhllyxd1 zM)xyyF l2xF l1M)z MWMWF l 2F l 80010 21.610 160 MPa 36zx21bhhbb3b322xz6633b h M MF l 2F lM2222xz21WWd332 26280010 21.6103 160 MPa d332d 與-3a Fb e5aFFeb E 33a