剖面模数计算方法

Allowable stress to ABS MODU 2001, part 3, charpter 2, section 1, item 3.3F=Fy/F.S., whereFy = 235 N/mm2 , or 34 ksiF.S. = 1.67 for axial or bending stress2.50 for shear stressHence, F = 140.7 N/mm2 , or 20.4 ksi for axial or bending stress94.0 N/mm2 , or 13.6 ksi for shear stress1. Bulkhead1.1 Wind pressure p = f V k2.c h.c s N/m2wheref = 0.611Vk = 100 knots = 51.44 m/sc s = 1.0c h = 1.1hence p = 1778.4 N/m2or 37.13 lbf/ft21.2 Bulkhead platingPlate panel maximum size (mm)4070 by 690Plate thickness, t (mm)8Bulkhead load to wind pressure p = 1778.4 N/m2or 37.13 lbf/ft2Stress due to lateral perpendicular load:σ = kpb2/t2 wherek = 0.741 for panel size ratio of 5.9 (4070/690)p =37.13lbf/ft2, or0.26 lbf/in2b =690 mmt =8mmHenceσ =1421 lbf/in2, or 1.42ksi OK3Shear stress at support,τ = RF max/A web = 4.49N/mm2, or0.7ksi OK2. Bottom2.1. bottom platingPlate panel maximum size (mm)2650 by 830Plate thickness, t (mm)8Deck load to MODU 2001, w920 kgf/m2, or 188 lbf/ft2Stress due to lateral perpendicular load:σ = kwb2/t2 wherek = 0.718 for panel size ratio of 3.19 (2650/830)w =188lbf/ft2, or 1.31 lbf/in2b =830mmt =8mmHenceσ =10090 lbf/in2, or10.1ksi OK33. APV' lower Supporting StructureAs per contract specification 2.22G, foundations for equipment shall be designed for combined staticand dynamic load of 1.5g vertical and 0.5g horizontal for roll and pitch.According to HYDRALIFT Drawing: T2820-D1157-G0040 APV's arrangement,per WORKING APV' average weight: 2750kg,add 10% variables: 3025kg is to be used in following calculation.3.1 check supporting plate panelThe supporting plate panel, which is supported at four sides, is considered conservatively as plate beam supported at two longer edges.Plate panel concentrated load maximum size (mm)1420 by 760Plate thickness, t (mm) =25.5Deck load to MODU 2001, w =920kgf/m2, or 188 lbf/ft2Max moment due to deck load q: M q =qL/8 =925N.mwhere L =0.76mMax reaction force due to deck loa R q=qL/2=4870NLoad Case 1 (LC1): Heave at 1.5gForce due to static and dynamic load:P = ma,wherem=3025kga=14.7m/s2 (1.5g)P=44467.5NHence,Q=2P = 88935NM1max=Ql1l2/L=16605N.mwhere L=0.76ml1=0.33ml2=0.43mR1max=Ql2/L=50318NForce due to pitch:P=ma,wherem=3025kga= 4.9m/s2 (0.5g)P pitch=14822.5NHence,Q2=2.755*P/5.76 = 7090NThe force acts on plate as a longitudinal tension, as illustrated in sketchLC3: Roll at 0.5g to starboardForce due to roll:P=ma,wherem=3025kga= 4.9m/s2 (0.5g)P=14822.5NHence,Q2=2.755*P/5.76 = 7090NThe force acts on plate as a transverse tension, as illustrated in sketchLC4: Heave at 1.5g, pitch at 0.5g to forward and roll at 0.5g to starboard (LC1+LC2+LC3)moment:BM max=M1max + Mq =17530N.mshear:RF max=R1max + Rq =55188Nlongitudinal tension:TF x =14179Ntransverse tension:TF y =14179Nplate beam modulus:SM=bt2/6 =154cm3where b =142cmt = 2.55cmplate beam area:A1 =bt =362cm2A2 =at =194cm2where a =76cmBending stress,σ = BM max/SM =113.91N/mm2, or16.5ksi OK Shear stress,τ = RF max/A1 = 1.52N/mm2, or0.2ksi OK Longitudinal tension stress:σx = TF x/A2 =0.73N/mm2, or0.1ksi OK Transverse tension stress:σy = TF y/A1 =0.39N/mm2, or0.1ksi OK3.2 Check supporting structurewhere L= 1.42mBM max = (q1+q2)L2/8 =1774kgf.mRFmax = (q1+q2)L/2 = 4997kgf3Bending stress ,σ = BM max/SM = 6.21N/mm2, or0.9ksi OK Shear stress ,τ = RF max/A1 = 6.81N/mm2, or 1.0ksi OKb. Beam A2-B2Similar to beam A1-B1, check beam A2-B2 stress is OK.R B2 =4964kgfc. Beam A3-B3Similar to beam A1-B1, check beam A3-B3 stress is OK.R B3 =2697kgfd. Beam A4-B4Similar to beam A1-B1, check beam A4-B4 stress is OK.R B4 =2482kgfe. Beam A5-B5Similar to beam A1-B1, check beam A5-B5 stress is OK.R B5 =4964kgff. Beam A6-B6Similar to beam A1-B1, check beam A6-B6 stress is OK.R B6 =4964kgfg. Beam A7-B7Similar to beam A1-B1, check beam A7-B7 stress is OK.R B7 =4964kgfh. Beam A8-B8Similar to beam A1-B1, check beam A8-B8 stress is OK.R B8 =4964kgfi. Beam A9-B9Similar to beam A1-B1, check beam A4-B4 stress is OK.R B9 =2482kgfj. Beam C1-D1Similar to beam A1-B1, check beam C1-D1 stress is OK.R C1 =4989kgfR D1 =4989kgfk. Beam C2-D2Similar to beam A1-B1, check beam C2-D2 stress is OK.R C2 =4957kgfR D2 =4957kgfl. Beam C3-D3Similar to beam A1-B1, check beam C2-D2 stress is OK.R C3 =2690kgfR D3 =2690kgf3.2.2 Check transverse girdersMax moment due to force R B1: M B1 = 0.76*1.985*R B1/2.745 =2746kgf.mMax moment due to force R B2: M B2 = 1.42*1.325*R B2/2.745 =3402kgf.mMax moment due to force R B3: M B3 = 2.08*0.665*R B3/2.745 =1359kgf.m Combined moment: BM max =6163kgf.mReaction force: R E1 = 1.985*R B1/2.745 + 1.325*R B2/2.745 + 0.665*R B3/2.745 =6663kgf Reaction force: R F1a = 0.76*R B1/2.745 + 1.42*R B2/2.745 + 2.08*R B3/2.745 =5995kgf hence,RF max =6663kgfBending stress ,σ = BM max/SM =24.00N/mm2, or 3.5ksi OK Shear stress ,τ = RF max/A WEB =8.17N/mm2, or 1.2ksi OKn. Beam E2-F2Similar to beam E1-E1, check beam E2-F2 stress is OK.Reaction force: R F2 =5984kgfDistributed load along the beam length due to bulkhead weight, q = 660kgf/mMax moment due to load q: M q =qL2/8 =622kgf.mMax moment due to force R D1: M D1 = 0.76*1.985*R D1/2.745 =2742kgf.mMax moment due to force R D2: M D2 = 1.42*1.325*R D2/2.745 =3398kgf.mMax moment due to force R D3: M D3 = 2.08*0.665*R D3/2.745 =1355kgf.mCombined moment: BM max =6774kgf.mReaction force: R E3 =7558kgfReaction force: R F3a =6890kgfhence,RF max =7558kgfBending stress ,σ = BM max/SM =26.38N/mm2, or 3.8ksi OK Shear stress ,τ = RF max/A WEB =9.27N/mm2, or 1.3ksi OKDeck load to MODU 2001, w = 920kgf/m2 or 188 lbf/ft2Distributed load along the beam length, q = 0.165*w =151.8kgf/mMax moment due to load q: M q =q*1.4452*(1+1.3/2.745)2/8 =86kgf.mMax moment due to force R B4: M B4 = 1.445*1.3*R B4/2.745 =1699kgf.mMax moment due to force R B5: M B5 = 2.105*0.64*R B5/2.745 =3402kgf.mCombined moment: BM max =4259kgf.mReaction force: R F1b =2424kgfReaction force: R =5146kgfthk(cm)width(cm)sectionarea(cm2)ctr.dist. toplt top(cm)d(cm)I0 (cm4)mom. ofinert.(cm4)SM(cm3)top flg 2.5516.542.075 1.27522.844135.0web1808042.5542666.748997.3btm flg0.816.513.282.950.732077.6 Combined135.27533.7125210.02520 Bending stress ,σ = BM max/SM =16.58N/mm2, or 2.4ksi OK Shear stress ,τ = RF max/A WEB = 6.31N/mm2, or0.9ksi OKDeck load to MODU 2001, w = 920kgf/m2 or 188 lbf/ft2Distributed load along the beam length, q1 = 0.165*w =151.8kgf/mDistributed load along the beam length due to bulkhead weight, q2 = 660kgf/m BM max = (q1+q2)L2/8 =765kgf.mRFmax = (q1+q2)L/2 = 1114kgfHence,R =1114kgfBending stress ,σ = BM max/SM = 2.98N/mm2, or0.4ksi OK Shear stress ,τ = RF max/A WEB = 1.37N/mm2, or0.2ksi OKr. Beam E5-F5Similar to beam F3-E5, check beam E5-F5 stress is OK.Reaction force: R E5b =1185kgfR F5 =1185kgfDeck load to MODU 2001, w = 920kgf/m2 or 188 lbf/ft2Distributed load along the beam length, q = 0.165*w =151.8kgf/mMax moment due to load q: M q =q*0.832*(1+2.66/3.49)2/8 =41kgf.mMax moment due to force R B6: M B6 = 0.68*2.81*R B6/3.49 =2718kgf.mMax moment due to force R B7: M B7 = 1.34*2.15*R B7/3.49 =4098kgf.mMax moment due to force R B8: M B8 = 2.0*1.49*R B8/3.49 =4239kgf.mMax moment due to force R B9: M B9 = 2.66*0.83*R B9/3.49 =1570kgf.mCombined moment: BM max =9829kgf.mReaction force: R E4b =9779kgfBending stress ,σ = BM max/SM =38.27N/mm2, or 5.6ksi OK Shear stress ,τ = RF max/A WEB =11.99N/mm2, or 1.7ksi OK3.2.3 Check longitudinal girdersDeck load to MODU 2001, w = 920kgf/m2 or 188 lbf/ft2Distributed load along the beam length, q = 0.3*w =276kgf/mMax moment due to load q: M q =q*3.5882/2 =1777kgf.mMax moment due to force R F1a +R F1b: M F1 = 0.938*(R F1a+R F1b) =7897kgf.mMax moment due to force R F2: M F2 = 2.193*R F2 =13123kgf.mMax moment due to force R F3a +R F3b: M F1 = 3.588*(R F3a+R F3b) =29041kgf.mCombined moment: BM max =51838kgf.mReaction force: R G1 = q*3.588 + RF1a + RF1b + RF2 + RF3a + RF3b=23397kgfBending stress ,σ = BM max/SM =167.46N/mm2, or24.3ksi OK Shear stress , 1.2τ = RF max/A WEB =65.58N/mm2, or9.5ksi OKDeck load to MODU 2001, w = 920kgf/m2 or 188 lbf/ft2Distributed load along the beam length, q1 = 0.3*w =276kgf/mLoad as Heave at 1.5gForce due to static and dynamic load:P = ma,wherem=3025kga=14.7m/s2 (1.5g)P=44468NHence,q2=2P/L = 6384kgf/mwhere L= 1.42mMax moment due to load q1: M q1 =q1*4.072/2 =2286kgf.mMax moment due to load q2: M q2 =q2*1.422/2 =6437kgf.mMax moment due to force R E4a +R E4b: M E4 = 1.42*(R E4a+R E4b) =21194kgf.mMax moment due to force R E5a +R E5b: M E4 = 4.07*(R E5a+R E5b) =9357kgf.mCombined moment: BM max =39273kgf.mReaction force: R G2 = q1*4.07 +q2*1.42 + R E4a + R E4b + R E5a + R E5b=27413kgf hence,RF =27413kgfBending stress ,σ = BM max/SM =65.74N/mm2, or9.5ksi OK Shear stress ,τ = RF max/A WEB =26.89N/mm2, or 3.9ksi OKv. Beam G3-F5Deck load to MODU 2001, w = 920kgf/m or 188 lbf/ft2Distributed load along the beam length, q1 = 0.165*w =151.8kgf/mDistributed load along the beam length due to bulkhead weight, q2 = 660kgf/m Max moment due to load q1: M q1 =q1*4.072/2 =1257kgf.mMax moment due to load q2: M q2 =q2*4.072/2 =5466kgf.mMax moment due to force R F4: M F4 = 1.42*R F4 =10964kgf.mMax moment due to force R F5: M F5 = 4.07*R F5 =4823kgf.mCombined moment: BM max =22510kgf.mBending stress ,σ = BM max/SM =62.18N/mm2, or9.0ksi OK Shear stress ,τ = RF max/A WEB =11.26N/mm2, or 1.6ksi OK4. APV' Upper Supporting Structure3.1 :P pitch =14822.5NQ1pitch =7733N Load due to a APV's Roll at 0.5g to starboard has calculated as 3.1 :P roll =14822.5NQ1roll =7733N 4.1 Check APV' end box mounting structure on forward transverse bulkhead4.1.1 Check stiffener' flange subjected to tensionAs per "Yield Line Analysis of Bolted Hanging Connections", AISC, Engineering Journal, Vol.14, No.3 1977, For hanger rods, the allowable working load is the smaller of following :P1 = F y t b2(2r)1/2(1+a/b)/LFP2 = F y t b2[r(1+a/b)]1/2/LFwhere F y=235N/mm2t b=13mmr= (F y-F b)/F y =0.401F b=140.7N/mm2a=50mmb=35.5mmLF = 1.7P1 =50388NP2 =22959Nhence,the allowable total force carried by flange[ P ]=22959Nmaximal load forced on stiffener L100x75x13 is P max = 1.5Q1roll = 11600 N < [ P ]OK!4.1.2 Check stiffener subjected to compressionR max =8522N9thk(cm)plt width/sect dep(cm)sectionarea(cm2)ctr.dist. toplt top(cm)d(cm)I0 (cm4)mom. ofinert.(cm4)SM(cm3)att plt0.85644.80.4 2.493.9section-7.515.46 5.9794.6359.7Combined60.26 1.8453.6704.3in3 Bending stress ,σ = BM max/SM =23.83N/mm2, or 3.5ksi OKR max=R F =8738Nthk(cm)plt width/sect dep(cm)sectionarea(cm2)ctr.dist. toplt top(cm)d(cm)I0 (cm4)mom. ofinert.(cm4)SM(cm3)att plt 1.2519.2240.625 3.1196.0section-7.521.06 6.6994.6314.4Combined45.06 3.5510.3965.9in3Bending stress ,σ = BM max/SM =22.61N/mm2, or 3.3ksi OK Shear stress ,τ = RF max/A1 = 4.15N/mm2, or0.6ksi OKC. Check beam L-MR max =11934Nthk(cm)width(cm)sectionarea(cm2)ctr.dist. toplt top(cm)d(cm)I0 (cm4)mom. ofinert.(cm4)SM(cm3)top flg00000.00.0web0.9 2.5 2.25 1.25 1.2 4.8btm flg0.97.5 6.75 2.950.5 1.7Combined9 2.5 6.530.2in3 Bending stress ,σ = BM max/SM =4145.20N/mm2, or601.6ksi OK Shear stress ,τ = RF max/A1 =53.04N/mm2, or7.7ksi OK4.2 Check APV' end box mounting structure on inboard longitudinal bulkheadAs per "Yield Line Analysis of Bolted Hanging Connections", AISC, Engineering Journal, Vol.14, No.3, 1977, For hanger rods, the allowable working load is the smaller of following :P1 = F y t b2(2r)1/2(1+a/b)/LFP2 = F y t b2[r(1+a/b)]1/2/LFwhere F y=235N/mm2t b=19mmr= (F y-F b)/F y =0.401F b=140.7N/mm2a=50mmb=35.5mmLF = 1.7hence,P1 =107634NP2 =49042Nhence,the allowable total force carried by flange[ P ]=49042Nmaximal concentrated load forced on girder T 811x12.5w P max = 3Q2roll = 23199 N < [ P ]OK!4.2.2 Check longitudinal girder' web stability under compression when roll to starboardAs per "Manual of STEEL CONSTRUCTION Allowable Stress Design", AISC,Slenderness ratio Kl/r =450> 200where K =2l =811mmr = 3.61mmAnd C c =(2*3.142E/F y)1/2 =130where E =200000MpaF y =235N/mm2here,Kl/r >C chence,the allowable stress F a = 12*3.142E/(23*(Kl/r)2 = 5.08N/mm2Compression total load forced on Girder' web section Q =12*Q2roll92796N web section area A=19625mm2RF max =92796Nthk(cm)width(cm)sectionarea(cm2)ctr.dist. toplt top(cm)d(cm)I0 (cm4)mom. ofinert.(cm4)SM(cm3)top flg 2.5547.3120.615 1.27565.474578.2web 1.2581.1101.37543.155563.784757.5btm flg 1.911.521.8584.6 6.674705.9Combined243.8426.1234041.73939240.4in3 Bending stress ,σ = BM max/SM =17.91N/mm2, or 2.6ksi OK Shear stress ,τ = RF max/A web =9.15N/mm2, or 1.3ksi OK4.3 Check supporting APV' end box mounting structure on TF-12 transverse bulkheadBending stress ,σ = BM max/SM =72.79N/mm2, or10.6ksi OK Shear stress ,τ = RF max/A web =17.26N/mm2, or 2.5ksi OKthk(cm)width(cm)sectionarea(cm2)ctr.dist. toplt top(cm)d(cm)I0 (cm4)mom. ofinert.(cm4)SM(cm3)top flg 1.310130.65 1.8871.8web 1.3 6.28.06 4.425.8184.0btm flg 1.957.5109.258.4532.948.7web 1.2581013.453.3262.1top flg 1.25121518.025 2.01270.1Combined155.318.8302636.726916.4in3Bending stress ,σ = BM max/SM =74.44N/mm2, or10.8ksi OK Shear stress ,τ = RF max/A web =17.26N/mm2, or 2.5ksi OK。