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———(1)(2)(3)(4)(5)(6)(7)t4mm1(1)ABC(2)AB8.8(4)4.8400N/mm2320N/mm2(5)d=162024mmMM16(3)C1.5~2mm4.64.8C2(1)(2)do=d+1.5~2φφ22(3)3(1)(2)(3)(4)4(1)——()(2)()(3)—()5(1)(2)——1(1)(2)(3)(4)(5)2(1)(2)bv2b4//fdNAN≤⎟⎠⎞⎜⎝⎛==πτ(3)bv2bv4fdNπ=bv2bv42fdNπ×=bvf(4)bcb/ftdN≤=∑σ(5)∑=tdfNbcbc∑tbcf3(1)(2)(3)l115do(4)l115do),min(bvbcbNNnN=),min(bvbcbNNnNη=7.01501.1o1≥−=dlηηNNb(1)(IIIIII)tdnbtdnAA)(o1o1n−=−=4(2)tdneaneA])1(2[o22221n−+−+=fAN≤=nnσ5(1)(T=Pe)(N=P)(2)oNTiri(2)jjTiiTiiTrNrNrNTi==∑∑=irTrN2ijjTjjjTyjTjjjTxjT,rxNNryNN==(3)PnPN=jP()()),min(bvbc2yjTPj2xjTvNNNNNN≤++=N=350kNQ345B(16Mn)b=360mmt1=8mmM20Cφ222bvN/mm130=f(1)t2t1/22bcN/mm420=f2N/mm315=ft2=6mmkN7.811304202422bv2bv=××=×=ππfdN(2)(3)∑=××==kN2.67842020bcbctdfN(4)n=350/67.3=5.2(5)631006080(6)l1=15do=1522=330100(7)An=(360-322)8=2352mm2σn=350000/2352=149N/mm2fσ=350000/(3608)=121N/mm21Nt=N+QQQN/4Nt1.25NfANAN≤≈=eet/25.1/σtbe8.0/ffAN=≤btftbetbfAN=Ae2bt/NNn=3jjiiiiyNyNyNMi==∑∑=iyMyN2ijj()tb2i11NyMyNi≤=∑4NtNv12vbv2tbt=⎟⎠⎞⎜⎝⎛+⎟⎠⎞⎜⎝⎛NNNN12vbv2tbt≤⎟⎠⎞⎜⎝⎛+⎟⎠⎞⎜⎝⎛NNNNbcvNN≤5V=200kNe=150mmt=20mmQ235B10M20Cφ222bvN/mm130=f(1)M=Ve=2000.15=30kNm2bcN/mm305=fkN6.41170245mm245btebt2e=×===fANA2btN/mm170=fbt222262i1tkN20)100200300400(24001030NyMyN=+++×××==∑(2)kN4113042042bv2bv=×==ππfdNkN2010/200v==N168.0412041.620222vbv2tbt=⎟⎠⎞⎜⎝⎛+⎟⎠⎞⎜⎝⎛=⎟⎠⎞⎜⎝⎛+⎟⎠⎞⎜⎝⎛NNNNkN202i1t==∑yMyN∑=××==vbcbckN1222030520NtdfN1(1)(2)8.810.9(3)(4)2(1)(2)(3)—(4)—(5)(6)1.5~2mmM3P(1)(2)—(3)—(4)—(5)P=0.675fyAe4µ(1)1µP1.11PnNµfbv9.0=nfnf=1nf=22(1)NvbvvNN≤(2)bv/NNn≥(3)0.5fAnnNAN≤−==n1n1n)/5.01(σ)/5.01(11nnNN−=3(1)bv2bv4fdnNπ=nn=1n=2bvfPnNNµfvvk9.03.1/≤≈(2)),min(/bcbvNNNn≥(3)∑=tdfNbcbcbcf1PC=PNtC-∆CP+∆PC-∆C+Nt=P+∆P∆P=Nt-∆CNthEACp∆AbApNthEAPb∆NtbpAPAC∆=∆PAAC∆=∆bpAp(10~20)AbAp10Abbpt1AANP+=∆tt91.009.0NC,NP=∆=∆NtC-∆C1/4PNP25.091.0t≥−PN82.0t≤PN8.0bt=Nt11bvvbtt=+NNNNNtNvΟbtNbvN1bvvbtt≤+NNNN10.98.0fvt≤+PnNPNµ)25.1(0.9tfvNPnN−≤µ212bvv2btt=⎟⎠⎞⎜⎝⎛+⎟⎠⎞⎜⎝⎛NNNNNtNvΟbtNbvN12bvv2btt≤⎟⎠⎞⎜⎝⎛+⎟⎠⎞⎜⎝⎛NNNN125.08.02bv2v2t≤⎟⎟⎠⎞⎜⎜⎝⎛+⎟⎠⎞⎜⎝⎛fdnNPNπ∑=≤tdfNNbtcbcvbcf2.1/bcbtcff=2.1/bcbcv∑=≤tdfNN∑=iyMyN2ijjt()P.yMyNi802i11t≤=∑())25.1(9.01tfNPnV/n−≤µ∑−≤iNPnV)25.1(9.0itfµNti=0M=40kNmV=160kNQ235B8M208.8P=110kNµ=0.350.8P=88kN88kN75120)40120(410402262i11t=×+××==∑iyMyN()Nv=160/8=20kNkN20kN4.4)7525.1110(3.00.91bv=×−××=N160kN170)2525.127525.121108(3.00.9bv=××−××−×××=N