EC3_EN 1993-Part 1-8
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Transcript of EC3_EN 1993-Part 1-8
prEN 1993-1-8 : 2003EUROPEAN STANDARDEUROPISCHE NORM 5 2003UDCDescriptors: 3 : 1.8 : Calcul des structures en acierBemessung und Konstruktion von StahlbautenPartie 1-8 : Calcul des assemblagesTeil 1-8 : Bemessung von Anschlssen 49 draftCEN European Committee for StandardisationEuropisches Komitee fr NormungCentral Secretariat: rue de Stassart 36, B-1050 Brussels 2003 Copyright reserved to all CEN members Ref. No. EN 1993-1-8 : 2003. E2 2prEN 1993-1-8 : 2003 3prEN 1993-1-8 : 2003 1993-1-8, : , CEN/TC250/SC3, BSI. 3 CEN/TC250/SC3. CEN 1993-1-8 Y--. . EN1993-1-8 , . : 2.2 (2) 2.8 ( 6: ) 3.4.2(1) 6.2.7.2(9) 4prEN 1993-1-8 : 20031 1.1 (1) 1993 S235, S275, S355 S460.1.2 (1) 1990 1.4.1.3 (1) : ( ): . : . . : . : . . ( ) ( ), 1.1. : , 1.2. : . : . (): , . : .2132312 = + = + = + ) ) 1 2 3 (.. , ) 5prEN 1993-1-8 : 2003 1.1: - 6prEN 1993-1-8 : 200311254523 31 -2 -3 4 5 )
- -) ( Mb1,Ed = Mb2,Ed ) 1.2: 1.4 (1) :d , d0 , do,t , , do,v , , dc dm : fH,Rd Hertzfur 7prEN 1993-1-8 : 2003e1 , , 3.6e2 , , 3.6e3 , 3.6e4 , 3.6eff n p1 , 3.6p1,0 , 3.6p1,i , 3.6p2 , 3.6r : , .ss ta tfc tp tw twc A A0 Avc , EN 1993-1-1As Av,eff Bp,Rd E Fp,Cd Ft,Ed Ft,Rd FT,Rd Fv,Rd Fb,Rd Fs,Rd,ser Fs,Rd 8prEN 1993-1-8 : 2003Fv,Ed,ser Fv,Ed Mj,Rd Sj Sj,ini Vwp,Rd z (2) 7 :CHS (circular hollow section)RHS (rectangularhollowsection), gov = (q/p) x 100 % gqpg() () 1.3: (3) 7 :Ai i(i = 0, 1, 2 3)Av ( )Av,eff L Mip,i,Rd , i(i = 0, 1, 2 3)Mip,i,Ed i(i = 0, 1, 2 3)Mop,i,Rd , i(i = 0, 1, 2 3)Mop,i,Ed i(i = 0, 1, 2 3)Ni,Rd , i(i = 0, 1, 2 3)Ni,Ed i(i = 0, 1, 2 3) 9prEN 1993-1-8 : 2003We,i i(i = 0, 1, 2 3)Wp,i i(i = 0, 1, 2 3)bi RHS i (i = 0, 1, 2 3)beff be,ov be,p bp bw di CHS i(i = 0, 1, 2 3)dw e fb fyi i(i = 0, 1, 2 3)fy0 g ( g q). g , , 1.3()hi i(i = 0, 1, 2 3)k , g, m, n, p p , , 1.3()q , , , 1.3()r tf ti i(i = 0, 1, 2 3)tp tw i i (i = 1, 2 3) .(4) 7 : i . i = 0 i = 1, 2 3 . , i=1 i =2 , 1.4(). i=1 , 1.4 () 10prEN 1993-1-8 : 2003i j . i j , 1.4 ().(5) 7 :n (0,Ed/ fy0 ) / M5( RHS)np (p,Ed / fy0) / M5( CHS)0,Ed p,Ed 0,Ed , , 1.4(6) 7 : , :- T, Y X:01dd , 01bd 01bb- K N:02 12 dd d + , 02 12 bd d + 02 1 2 14 bh h b b + + +- KT:03 2 13 dd d d + + , 03 2 13 bd d d + + 03 2 1 3 2 16 bh h h b b b + + + + +p bi /bp :002 td , 002 tb ftb20 , :0dhi 0bhip hi /bp ov , (ov = (q/p) x 100%), 1.3().(7) .:O 7.31 11prEN 1993-1-8 : 2003 ) ) ) 1.4: 12prEN 1993-1-8 : 20032 2.1 (1) 1993 2.8 1993 . 2.2 (1) 1993-1-1. (2) 2.1 M 2.1: M0, M1 M2 EN 1993-1-1 M2 - - M3M3 M4 M5 M6, ser M7 c EN 1992: M . :M2 = 1,25 ,M3 = 1,25 M3 = 1,1 , M4 = 1,0 , M5 = 1,0 , M6,ser = 1,0 , M7 = 1,1 .(3) 1993-1-9. 2.3 (1) 1993-1-1. 2.4 (1) . 13prEN 1993-1-8 : 2003(2) .(3) , . 3.9.3. 2.5 (1) . :() , () ,() ,() , () / () ( EN 1990).(2) 2.5(1).2.6 , / (1) : . (2) ( ), C(3.4), (3.6.1), .(2) / , ( 3.4). 14prEN 1993-1-8 : 20032.7 (1) , , 5.1.5.(3) , 2.7(1). (2.5). , 3.10.3.: EN 1993-1-1, BB 1.2.1 2 3 2.5: 2.8 , . . , , . . , 1: prEN 10025:2001 Hot rolled products of non-alloy structural steels - Technical delivery conditions, 2: , EN 10029:1991 Hot rolled steel plates 3 mm thick or above -Tolerances on dimensions, shape and mass EN 10034:1993 Structural steel I- and H-sections - Tolerances on shape and dimensions EN 10051:1991 Continuously hot-rolled uncoated plate, sheet and strip of non-alloy and alloy steels - Tolerances on dimensions and shapeEN 10055:1995 Hot rolledsteel equal flangetees withradiusedroot andtoes-Dimensions and tolerances on shape and dimensions1223 3 15prEN 1993-1-8 : 2003EN 10056-1:1995 Structural steel equal and unequal leg angles - Part 1: DimensionsEN 10056-2:1993 Structural steel equal andunequal legangles-Part 2: Tolerances onshapeand dimensions EN 10164:1993 Steel products with improved deformation properties perpendicular to the surface of the product - Technical delivery conditions , 3: EN 10219-1:1997 Cold formed welded structural hollow sections of non-alloy and fine grain steels - Part 1: Technical delivery requirementsEN 10219-2:1997 Cold formed welded structural hollow sections of non-alloy and fine grain steels - Part 2: Tolerances, dimensions and sectional propertiesEN 10210-1:1994 Hot finished structural hollow sections of non-alloy and fine grain structural steels - Part 1: Technical delivery requirements EN 10210-2:1997 Hot finished structural hollow sections of non-alloy and fine grain structural steels - Part 2: Tolerances, dimensions and sectional properties , 4: , Pr EN WI 00185215:2001*)High strength structural bolting for preloading-Part 1 : General RequirementsPr EN WI 00185220:2001*)High strength structural bolting for preloading - Part 2 : Suitability Test for preloadingPr EN WI 00185216:2001*)High strength structural bolting for preloading-Part 3 : SystemHR -Hexagon bolt and nut assembliesPr EN WI 00185217:2001*)High strength structural bolting for preloading-Part 4 : SystemHV -Hexagon bolt and nut assembliesPr EN WI 00185218:2001*)High strength structural bolting for preloading -Part 5 : Plain washers for system HRPr EN WI 00185219:2001*)Highstrengthstructural boltingforpreloading-Part 6:Plainchamfered washers for systems HR and HV*) prEN 1993-1-8.EN ISO 898-1:1999 Mechanical properties of fasteners made of carbon steel and alloy steel - Part 1: Bolts, screws and studs (ISO 898-1:1999)EN 20898-2:1993 Mechanical propertiesoffasteners-Part 2: Nutswithspecial proofloadvalues- Coarse thread (ISO 898-2:1992) EN ISO 2320:1997 Prevailing torque type steel hexagon nuts - Mechanical and performance requirements (ISO 2320:1997) EN ISO 4014:2001 Hexagon head bolts - Product grades A and B (ISO 4014:1999)EN ISO 4016:2001 Hexagon head bolts - Product grade C (ISO 4016:1999)EN ISO 4017:2001 Hexagon head screws - Product grades A and B (ISO 4017:1999)EN ISO 4018:2001 Hexagon head screws - Product grade C (ISO 4018:1999)EN ISO 4032:2001 Hexagon nuts, style 1 - Product grades A and B (ISO 4032:1999)EN ISO 4033:2001 Hexagon nuts, style 2 - Product grades A and B (ISO 4033:1999)EN ISO 4034:2001 Hexagon nuts - Product grade C (ISO 4034:1999)EN ISO 7040:1997 Prevailing torque hexagon nuts (with non-metallic insert), style 1 - Property classes 5, 8 and 10EN ISO 7042:1997 Prevailing torque all-metal hexagon nuts, style 2 - Property classes 5, 8, 10 and 12 16prEN 1993-1-8 : 2003EN ISO 7719:1997 Prevailing torque type all-metal hexagon nuts, style 1 - Property classes 5, 8 and 10ISO 286- 2:1988 ISO system of limits and fits - Part 2: s of standard tolerance grades and limit deviations for hole and shaftsISO 1891:1979 Bolts, screws, nuts andaccessories-Terminologyandnomenclature-Trilingual editionEN ISO 7089:2000 Plain washers- Nominal series- Product grade AEN ISO 7090:2000 Plain washers, chamfered - Normal series - Product grade AEN ISO 7091:2000 Plain washers - Normal series - Product grade CEN ISO 10511:1997 Prevailing torque type hexagon thin nuts (with non-metallic insert)EN ISO 10512:1997 Prevailing torque type hexagon nuts thin nuts, style 1, with metric fine pitch thread - Property classes 6, 8 and 10EN ISO 10513:1997 Prevailing torque type all-metal hexagon nuts, style 2, with metric fine pitch thread - Property classes 8, 10 and 12 , 5: EN 12345:1998 Welding-Multilingual terms for welded joints with illustrations. September 1998.EN ISO 14555:1995 Welding-Arc stud welding of metallic materials. May 1995Pr EN ISO 13918:1997 Welding-Studs for arc stud welding-January 1997EN 288-3:1992 Specificationandapproval of weldingprocedures for metallic materials. Part 3: Welding procedure tests for arc welding of steels. 1992Pr EN ISO 5817:2000 Arc-welded joints in steel - Guidance for quality levels for imperfections , 6:: ., 7: EN 10901Requirements for the execution of steel structures1 EN 1090 ENV 1090 17prEN 1993-1-8 : 20033 , 3.1 , 3.1.1 (1) , : 4 2.8.(2) 3.1.(3) fyb fub 4.6, 5.6, 6.8, 8.8 10.9 3.1. . 3.2: fyb fub 4.6 5.6 6.8 8.8 10.9fyb (N/mm2) 240 300 480 640 900fub (N/mm2) 400 500 600 800 10003.1.2 (1) 8.8 10.9 2.8 : 4 , 2.8 : 7.3.2 (1) , 2.8 : 6. 3.3 (1) : 2.8 : 1 2.8 : 4 EN 10080, 640 N/mm2 , 900 N/mm2.3.4 3.4.1 (1) : 18prEN 1993-1-8 : 2003) A: 4.6 10.9. . 3.6, 3.6 3.7.) B: 3.1.2(1). . 3.9. 3.6, 3.6 3.7. ) C: 3.1.2(1). . 3.9, 3.63.7. , Nnet,Rd( 6.2 EN1993-1-1) . 3.2.3.4.2 (1) :) D: 4.6 10.9. . . . ) E: 8.8 10.9 2.8 : 7. 3.2. 3.3: 19prEN 1993-1-8 : 2003 AFv,Ed Fv,RdFv,Ed Fb,Rd . 4.6 10.9.B Fv,Ed.ser Fs,Rd,serFv,Ed Fv,RdFv,Ed Fb,Rd 8.8 10.9. 3.9.C Fv,Ed Fs,RdFv,Ed Fb,RdFv,Ed Nnet,Rd 8.8 10.9. 3.9.Nnet,Rd EN 1993-1-1 D Ft,Ed Ft,RdFt,Ed Bp,Rd . 4.6 10.9.Bp,Rd , 3.4.E Ft,Ed Ft,RdFt,Ed Bp,Rd 8.8 10.9.Bp,Rd , 3.4. Ft,Ed , 3.11. 3.4.: (.. ) . 3.5 (1) 3.3. (2) , EN 1993-1-9. 3.4: , 3.6 1) 2) 3) EN 10025 EN 10025-5 EN 20prEN 1993-1-8 : 200310025-5 e11,2d04t + 40 mm 8t 125 mm e21,2d04t + 40 mm 8t 125 mm e3 1,5d0
4) e4 1,5d0
4) p12,2d0 14t 200 mm 14t 200 mm 14tmin 175 mm p1,0 14t 200 mm p1,i 28t 400 mm p2
5)2,4d0 14t 200 mm 14t 200 mm 14tmin 175 mm1) , : .2) EN1993-1-1 0,6 pi . p1/t 9 . , EN 1993-1-1. .3)t . 4) 2.8 : 7. 5) p2= 1,2d0 L 2,4d0 ( 3.6). ) ) 21prEN 1993-1-8 : 2003p1 14 t 200 mm p2 14 t 200 mm p1,0 14 t 200 mm p1,i 28 t 400 mm1 2 ) ) ) 3.6: 3.6 3.6.1 (1) / 3.4.(2) 3.1.2(1) , Fp,Cd , :Fp,Cd = 0,7 fub As / M7... (3.1): , 3.2.(3) 3.4 2.8 : 4. , EN1090, 3.4. , EN1090 ( ) 3.4 0,85. 22prEN 1993-1-8 : 2003(4) Fv,Rd 3.4 2.8 : 7. (5) M12 M14 2 mm . 4.8, 5.8, 6.8, 8.8 10.9 Fv,Rd 3.4 0,85.(6) . (7) . (8) 1/3 , 3.7.(9) 2.8 : 7.(10) , , 3.8, . Fb,Rd :Fb,Rd 1,5 fu d t / M2... (3.2): . (11) 8.8 10.9, . (12) tp d, 3.9, Fv,Rd 3.4, p :p =pt dd3 89+p 1... (3.3)(13) , tp . (14) . , Ft.Ed Ft,Rd 3.4.(15) S 235, fur 400 N/mm2.(16) , 4,5d 6,5d . 23prEN 1993-1-8 : 2003t 0,7 fy,wc : kwc= wc y Ed comf, ,/ 7 , 1 ... (6.44): kwc 1,0 . , . (3) , , 6.40, .(4) . 74prEN 1993-1-8 : 2003)) ) 6.39: 6.40: (5) : , . , 6.48.(6) 6.2.6.1, 1,5twc, , 2,0twc, . , Avc , 6.2.6.1(6). 75prEN 1993-1-8 : 20036.2.6.3 (1) :Ft,wc,Rd=0, wc , , tMwc y wc t efff b... (6.45): (2) , beff,t,wc :beff,t,wc=) ( 5 2 2 s t a tfc b fb+ + +... (6.46): I H: s= rc I H: s=ca 2:acrc 6.41 ab 6.39.(3) beff,t,wc , 6.2.6.4.(4) 6.3, beff,t,wc 6.2.6.3(2) 6.2.6.3(3) .(5) .(6) / .: . , 6.48.(7) . (8) 6.2.6.1, . tw,eff : a ts: : tw,eff=1,5 twc... (6.47) 76prEN 1993-1-8 : 2003 :tw,eff=2,0 twc... (6.48) a 2 /st : S 235, S 275 S 355: tw,eff=1,4 twc... (6.49) S 420 S 460: tw,eff=1,3 twc... (6.19)(9) , , Avc, , 6.2.6.1(6).6.2.6.4 6.2.6.4.1 , (1) , , , 6.2.4, : (2) eminm 6.2.4 6.41.(3) , 6.2.4.2, 6.4. 77prEN 1993-1-8 : 2003 mrc0,8 rceemin
m eemin0,8 a 2cac) .mrc0,8 rceminm 0,8 a2cacemin) .mrc0,8 rceemin m eemin0,8 a2cac) . 6.41: e, emin, rcm 6.21: eff,cp eff,nc eff,cp eff,nc 2m 4m + 1,25e 2p p :2m m + 2e1 :4m + 1,25e2m + 0,625e + e1 :m + p2e1 + p :2m + 0,625e + 0,5pe1 + 0,5p 1: eff,1=eff,nceff,1eff,cpeff,1=eff,nceff,1eff,cp 2: eff,2=eff,nceff,2=eff,nc 78prEN 1993-1-8 : 20036.2.6.4.2 , (1) / .(2) ,, , 6.2.4, : (3) , 6.42. . 1 2 3 4 6.42: (4) eminm 6.2.4 6.41.(5) eff 6.2.4.2, 6.5. 6.5 6.44.(6) 6.2.6.1. 79prEN 1993-1-8 : 2003 6.22: eff,cp eff,nc eff,cp eff,nc 2m m m + p0,5p + m (2m + 0,625e) 2m 4m + 1,25e 2p p :2mm + 2e1 :4m + 1,25e2m + 0,625e + e1 :m + p2e1 + p : 2m+ 0,625e+ 0,5pe1 + 0,5p :2mm + 2e1e1 + m (2m + 0,625e) 1: eff,1 = eff,nceff,1 eff,cpeff,1 = eff,nceff,1 eff,cp 2: eff,2 = eff,nceff,2 = eff,nc 6.44.6.2.6.4.3 , (1) Ffc,Rd , , : Ffc,Rd= 0 , , ,/M fb fb fc b efff t b ... (6.50):beff,b,fc beff 4.10, .: 4.10(4) 4.10(6).6.2.6.5 (1) , ,, 6.2.4, : (2) . , 6.10. . 80prEN 1993-1-8 : 2003(3) eminm 6.2.4 6.41 . emin ex , 6.43.(4) eff 6.2.4.2, 6.6.(5) m mx 6.6, 6.43. pee . , ex mx em 6.43: 6.23: eff,cp eff,nc eff,cp eff,nc :2mxmx + wmx + 2e : 4mx + 1,25ex e+2mx+0,625ex 0,5bp0,5w+2mx+0,625ex 2m m m + p0,5p + m (2m + 0,625e) 2m 4m + 1,25 e 2p p 2m 4m + 1,25 e m + p 2m+0,625e+0,5p 1: eff,1 = eff,nceff,1 eff,cpeff,1 = eff,nc eff,1 eff,cpbpwexmxeffeffeff 81prEN 1993-1-8 : 2003 2: eff,2 = eff,nceff,2 = eff,nc 6.44. 6.44: 6.2.6.6 82prEN 1993-1-8 : 2003(1) , , , 6.2.4.(2) eff 0,5ba, ba , 6.45.(3) eminm 6.2.4 6.46. 6.45: eff )g0,4 ta)g>0,4 ta:- . - - ba . 6.46: eminm 6.2.6.7 (1) , , 6.2.7. :Fc,fb,Rd=Mc,Rd/ (h tfb ) ... (6.51)effeffbaeff 83prEN 1993-1-8 : 2003:h .Mc,Rd , , EN 1993-1-1. , Mc,Rd . tfb . 600 mm 20%.(2) , : 45 ss . (3) , 6.2.6.2.6.2.6.8 (1) , :Ft,wb,Rd= 0 , , ,/M wb y wb wb t efff t b ... (6.52)(2) beff,t,wb , 6.2.6.5 .6.2.6.9 (1) . EN 1992.(2) Fc,pl,Rd , 6.2.5.6.2.6.10 (1) Fc,pl,Rd , , 6.2.5.6.2.6.11 (1) Ft,pl,Rd , 6.2.6.5. 84prEN 1993-1-8 : 2003(2) , . 6.2.6.12 (1) . . (2) , .: . (3) , 3.6, EN 1992-1-1.(4) : ( 6.47()) ( 6.47()) (5) , . EN 1992-1-1. fyb 300 N/mm2.(6) , . . 85prEN 1993-1-8 : 20031 23 () () 6.47: 6.2.7 - 6.2.7.1 (1) Mj,Ed :Rd jEd jMM,, 1,0 ... (6.53)(2) 6.2.7 Mj,Rd NEd . 5% Np,Rd .(3) NEd 5% Npl,Rd, :Rd jEd jRd jEd jNNMM,,,,+ 1,0 ... (6.54):Mj.Rd Nj.Rd , 86prEN 1993-1-8 : 2003(4) 6.48().(5) ( , 6.2.3(6)) 6.48().(6) 6.48().(7) 6.2.7.2.(8) , , 6.49, FRd 3,8Ft,Rd, Ft,Rd 6.2. , . , F1,Rd . F2,Rd F1,Rd , FRd 2F1,Rd .(9) . , 6.48.(10) . (11) . .(12) , . . 87prEN 1993-1-8 : 2003 ) z = h - tfbh tfb ) ) ) , z ) z zeq, 6.3.3.1. 6.48: , z Mj,Rd 88prEN 1993-1-8 : 2003 6.49: (13) , , , . 25% 2.5% .
(14) , 25% .(15) . , . .(16) :) ) ) : , , , , .6.2.7.2 - (1) Mj,Rd - :Mj,Rd= Rd tr rrF h,... (6.55) 89prEN 1993-1-8 : 2003:Ftr,Rd r hr r r : , .(2) , .(3) Ftr,Rd , 1, , 2 . (4) Ftr,Rdr .(5) Ftr,Rd r Ft,Rd , , 6.2.7.2(6), , , 6.2.7.2(7), (8) (9).(6) Ftr,Rd r, , : Ft,wc,Rd- 6.2.6.3 Ft,fc,Rd- 6.2.6.4 Ft,ep,Rd- 6.2.6.5 Ft,wb,Rd- 6.2.6.8(7) Ftr,Rd r , Ft,Rd 6.2.7.2(6), r, , : Ft,RdVwp,Rd/ - 5.3(7) - 6.2.6.1 Ft,Rd : Fc,wc,Rd- 6.2.6.2 Fc, fb,Rd- 6.2.6.7(8) Ftr,Rd r , Ft,Rd 6.2.7.2(6), r, , . : Ft,wc,Rd- 6.2.6.3 Ft,fc,Rd- 6.2.6.4 Ft,ep,Rd- 6.2.6.5 Ft,wb,Rd- 6.2.6.8 90prEN 1993-1-8 : 2003(9) Ftr,Rd x 1,9 Ft,Rd , Ftr,Rd r , , :Ftr,RdFtx,Rd hr/ hx... (6.56):hx x x 1,9 Ft,Rd : (6.26).(10) 6.2.7.2(1) 6.2.7.2(9) , 6.50, . 6.50: 6.2.8 6.2.8.1 (1) , , . (2) . , fjd 6.2.5(7).(3) , , : , , 6.51(). , , 6.51(). 91prEN 1993-1-8 : 2003 , , 6.51() 6.51().(4) 6.2.8.2 6.2.8.3.(5) , : , EN 1992. , ME dzC , lz= =zC , rNE dME dzT , lzzT , rNE d= =) ) ME dzC , lz= =zT , rNE dME dzT , lz= =zC , rNE d) ) 6.51: z 6.2.8.2 (1) Nj,Rd , , FC,Rd 6.52( ). , 6.52. 6.2.5. 92prEN 1993-1-8 : 2003 1 321 12 23 3 6.52: 6.2.8.3 (1) Mj,Rd 6.7, ( 2 6.52) . : FT,l,Rd - 6.2.8.3(2) FT,r,Rd - 6.2.8.3(3) FC,l,Rd - 6.2.8.3(4) FC,r,Rd - 6.2.8.3(5)(2) FT,l,Rd : Ft,wc,Rd - 6.2.6.3 Ft,pl,Rd - 6.2.6.11(3) FT,r,Rd : Ft,wc,Rd - 6.2.6.3 Ft,pl,Rd - 6.2.6.11(4) FC,l,Rd : Fc,pl,Rd - 6.2.6.9 Fc,fc,Rd - 6.2.6.7(5) FC,l,Rd : Fc,pl,Rd - 6.2.6.9 Fc,fc,Rd - 6.2.6.7(6) zT,l, zC,l, zT,r, zC,r 6.2.8.1. 93prEN 1993-1-8 : 2003 6.24: Mj,Rd z Mj,Rd z=zT,l + zC,rNEd > 0 e > zT,lNEd 0 e -zC,r 1 /,, 1 ,+ e zz Fr CRd T 1 /1 ,, ,e zz FTRd r C z=zT,l + zT,rNEd > 0 0 < e < zT,lNEd > 0 -zT,r < e 0 1 /,, 1 ,+ e zz Fr TRd T 1 /1 ,, , e zz FTRd r T 1 /,, 1 ,+ e zz Fr TRd T 1 /1 ,, 1 , e zz FTRd T z=zC,l + zT,rNEd > 0 e -zT,rNEd 0 e > zC,l 1 /,, 1 ,+e zz Fr TRd C 1 /1 ,, , e zz FCRd r T z=zC,l + zC,rNEd 0 0 < e < zC,lNEd 0 -zC,r < e 0 1 /,, 1 ,+e zz Fr CRd C 1 /1 ,, ,e zz FCRd r C 1 /,, 1 ,+e zz Fr CRd C 1 /1 ,, ,e zz FCRd r CMEd > 0 , NEd > 0 e = EdEdNM = RdRdNM6.3 6.3.1 (1) , ki 6.3.2.: .(2) , ki . - 6.3.3, 6.3.4.(3) , , . . 94prEN 1993-1-8 : 2003(4) NEd 5% Np,Rd , Sj - , Mj,Ed Mj,Rd , :Sj=i ikEz12... (6.57):ki i z , 6.2.7 Sj,ini / Sj , 6.3.1(6): Sj,ini (6.27) = 1,0.(5) Sj Mj,Ed Mj,Rd , 6.3.4.(6) : Mj,Ed2/3 Mj,Rd:=1 ... (6.58) 2/3 Mj,Rd 0 e > zT,lNEd 0 e -zC,rk r C Te eek kz E+ + ) / 1 / 1 (, 1 ,2ek= r C TT T r C r Ck kk z k z, 1 ,1 , 1 , , ,+ z=zT,l + zT,rNEd > 0 0 < e < zT,lNEd > 0 -zT,r < e 0k r T Te eek kEz+ + ) / 1 / 1 (, 1 ,2ek= r T TT T r T r Tk kk z k z, 1 ,1 , 1 , , ,+ z=zC,l + zT,rNEd > 0 e -zT,rNEd 0 e > zC,lk r T Ce eek kEz+ + ) / 1 / 1 (, 1 ,2ek= r T CC C r T r Tk kk z k z, 1 ,1 , 1 , , ,+ z=zC,l + zC,rNEd 0 0 < e < zC,lNEd 0 -zC,r < e 0k r C Ce eek kEz+ + ) / 1 / 1 (, 1 ,2ek= r C CC C r C r Ck kk z k z, 1 ,1 , 1 , , ,+MEd > 0 , NEd > 0 , 6.3.1(6).e = EdEdNM = RdRdNM 101prEN 1993-1-8 : 20036.4 6.4.1 (1) , .(2) 6.4.26.4.3. S235,S275S355 NEd 5% Np,Rd .(3) 6.4.2 6.4.3, , Mj,Rd 1,2 Mpl,Rd .(4) 6.4.26.4.3, EN1990, D. , , EN1990.6.4.2 (1) - Mj,Rd , d/tw 69.(2) , :) : ) t ( ()) :ty ubf f d / 36 , 0... (6.62):fy (3) Mj,Rd , . 102prEN 1993-1-8 : 20036.4.3 (1) Cd - , , 6.4.2(1):Cd=0,025 hc/ hb... (6.63):hb hc (2) -, , Cd 0,015 . 103prEN 1993-1-8 : 20037 7.1 7.1.1 (1) , . (2) / .(3) EN 10210 EN10219, . (4) 460 N/mm2. 355N/mm2, 0,9.(5) 2,5 mm.(6) 25 mm . (7) EN 1993-1-9.(8) 7.54.7.1.2 (1) 7.1.2(2) 7.1.2(8).(2) 1 2 EN 1993-1-1 .(3) i : i 30(4) . , . (5) , , ( t1 + t2 ). 104prEN 1993-1-8 : 2003(6) , . 25%.(7) / , ti fyi .(8) , . K KT N T X Y DK KK X TT DY XX 7.54: 105prEN 1993-1-8 : 20037.2 7.2.1 (1) , EN 1993-1-1 .(2) 7.4,7.57.6 .(3) 0,Ed p,Ed :0,Ed= 0 (,, 00, 0eEd EdWMAN+... (7.64)p,Ed= 0 (,, 00,eEd Ed pWMAN+... (7.65):Np,Ed= >0, , 0cosii Ed i EdN N 7.2.2 (1) :) ( ) ( ))(), , ( ) ) ) ( )) ( ) ) .:, 7.4 7.6.(2) 7.55 () () CHS.(3) 7.56 () () RHS.(4) 7.57 () () CHS RHS . 106prEN 1993-1-8 : 2003(5) , , .- 7.55: CHS 107prEN 1993-1-8 : 2003- 7.56: RHS 108prEN 1993-1-8 : 2003- 7.57: CHS RHS I H 109prEN 1993-1-8 : 20037.3 7.3.1 (1) , , , .(2) , , . , , 20%.(3) 2.8 : 7.(4) . (5) 4.(6) 7.3.1(4) , , . (7) , - 7.58. 7.58: - (8) , 4.14. 110prEN 1993-1-8 : 20037.4 CHS 7.4.1 (1) 7.1 7.4.2 7.4.3.(2) 7.1 . . (3) 7.1, 7.2.2. , , . 7.30: CHS CHS 0,2 di/ d0 1,0 2 10 d0 / t0 50 10 d0 / t0 40 2 10 di/ ti 50ov 25%g t1 + t27.4.2 (1) , Ni,Ed Ni,Rd 7.2, 7.37.4, .(2) :Rd i opEd i opRd i ipEd i ipRd iEd iMMMMNN, ,, ,2, ,, ,,,+]]]]
+ 1,0 ... (7.66):Mip,i,Rd Mip,i,Ed Mop,i,Rd Mop,i,Ed 111prEN 1993-1-8 : 2003 7.31: CHS CHS - T Y N1,Rd = 52120 02 , 0/ ) 2 , 14 8 , 2 (sinMy pt f k + - X N1,Rd = 5120 0/) 81 , 0 1 (2 , 5sinMy pt f k - K N N1,Rd = 501120 0/ 2 , 10 8 , 1sinMy p gddt f k k
,`
.|+N2,Rd = RdN, 121sinsin - K, N KT T, Y X [i = 1, 2 3] di d0 2t0 :Ni,Rd = 5200/sin 2sin 13Miiiyd tf+kgkpkg = ( )
,`
.| ++33 , 1 / 5 , 0 exp 1024 , 0102 , 12 , 0t g ( 7.59)np > 0(): kp = 1 0,3 np (1 + np ) kp 1,0np 0(): kp = 1,0 112prEN 1993-1-8 : 2003 7.32: CHS Ni,Rd = 52 20 0/ ) 20 4 (M y pt f k +Mip,i,Rd = 0Mop,i,Rd = 0,5 bi Ni,RdNi,Rd = 520 0/81 , 0 15My pt f k Mip,i,Rd = 0Mop,i,Rd = 0,5 bi Ni,RdNi,Rd = ( )520 0/ 25 , 0 1 5M y pt f k +Mip,i,Rd = hi Ni,RdMop,i,Rd = 0Ni,Rd = ( )520 0/ 25 , 0 1 5M y pt f k +Mip,i,Rd = hi Ni,RdMop,i,Rd = 0 itmax = i el Ed Edt W M A N ) / / ( + 5 0 0/ ) 3 / ( 2M yf t kp 7.1: 0,4 4 = bi/d0 = hi /d0np > 0():kp = 1 0,3 np(1 + np) kp 1,0np 0(): kp = 1,0 113prEN 1993-1-8 : 2003 7.33: I, H RHS CHS 1hd1N01bt0N1,Rd = kp fy0 t02 (4 + 202)(1 + 0,25) / M5Mip,1,Rd = h1 N1,Rd/(1 + 0,25)Mop,1,Rd = 0,5 b1 N1,Rd1N1N1hd0t0N1,Rd =( )520 0/ 25 , 0 181 , 0 15My pt f k +Mip,1,Rd = h1 N1,Rd/(1 + 0,25)Mop,1,Rd = 0,5 b1 N1,Rd1N1hd01bt0N1,Rd = kp fy0 t02 (4 + 202)(1 + 0,25)/ M5Mip,1,Rd = h1 N1,RdMop,1,Rd = 0,5 b1 N1,Rd1N1N1hd0t0N1,Rd =( )520 0/ 25 , 0 181 , 0 15My pt f k +Mip,1,Rd = h1 N1,RdMop,1,Rd = 0,5 b1 N1,Rd I H:1 maxt = ( )1 (/ / t W M A Ne Ed Ed+ 5 0 0/ ) 3 / ( 2M yf t RHS: 1 maxt = ( )1 (/ / t W M A Ne Ed Ed+ 5 0 0/ ) 3 / (M yf t kp 7.1: 0,4 4 = b1 / d0 = h1 / d0np > 0():kp = 1 0,3 np (1 + np) kp 1,0np 0(): kp = 1,0 114prEN 1993-1-8 : 2003(3) Mi,Ed .(4) Mi,Rd 7.3, 7.4 7.5, . (5) 7.6 .(6) kg 7.2, 7.59. kg , g q 1.3().1.01.52.02.53.03.54.04.5-12 -8 -4 0 4 8 12,,,,,,,,kg / t 0g=7,5=10=12,5=15=17,5=20=22,5=25 (q = -g) 7.59: kg 7.2 115prEN 1993-1-8 : 2003 7.34: CHS CHS - T, X, Y dM11dt00i p , 1 Mip,1,Rd = 51120 0/sin85 , 4M pykd t f - K, N, T, X Yd11dt00Mo p , 1Mop,1,Rd = 51120 0/81 , 0 17 , 2sinM pykd t f - K N T, X Y d1 d0 2t0 :Mip,1,Rd = 512121 0 0/sin 4sin 3 13Myd t f +Mop,1,Rd = 512121 0 0/sin 4sin 33Myd t f + kp np > 0():kp = 1 0,3 np (1 + np )kp 1,0np 0(): kp = 1,0 116prEN 1993-1-8 : 2003 7.35: CHS CHS .N1,Ed N1,RdN1,Rd N1,Rd 7.2. 1 2 .N3NN1231 2N1,Ed sin 1 + N3,Ed sin 3 N1,Rd sin 1N2,Ed sin 2 N1,Rd sin 1N1,Rd N1,Rd K 7.2 01dd : 03 2 13dd d d + + .N1,Ed sin 1 + N2,Ed sin 2 Nx,Rd sin xNx,Rd Nx,Rd X 7.2, Nx,Rd sin x :N1,Rd sin 1N2,Rd sin 2 1 2 .Ni,Ed Ni,Rd Ni,Rd Ni,Rd K 7.2, , 1-1 o :2(, , 0, 02(, , 0, 0]]]]
+]]]]
Rd pEdRd pEdVVNN 1,0 117prEN 1993-1-8 : 20037.4.3 (1) , 7.4.2 7.4.3(2).(2) 7.7 , 7.4.2, kp . 7.36: T 60 90 1 = 1,0 XX 1 2 . N2,Ed/N1,Ed . =Ed EdN N, 1 , 2/ 33 , 0 1+N1,Ed N2,Ed N2,Ed N1,Ed K 60 90 1 2 . = 0,9 , 1-1, :2, 0 (,, 02, 0 (,, 0]]]]
+]]]]
Rd pEdRd pEdVVNN 1,0 118prEN 1993-1-8 : 20037.5 CHS RHS RHS 7.5.1 (1) 7.8 7.5.2 7.5.3.(2) 7.8 . . (3) 7.8, 7.2.2. , , . 7.37: CHS RHS RHS [ i = 1 2, j = ]bi /b0di /b0bi/ti hi/ti di/ti h0 /b0hi/bib0/t0h0/t0 bi /bj T, Y X bi /b0 0,25bi/ti 35hi/ti 35 2bi/ti 35hi/ti 35 0,5 2,0 35 2K N bi /b0 0,35 0,1 + 0,01 b0 /t0 35 2g /b0 0,5(1 ) 1,5(1 ) 1) g t1 + t2K N bi /b0 0,25 1 2ov 25% ov 100% 2) bi /bj 0,75 di/b0 0,4 0,8 1di/ti 50 di bidj bj.1)g /b0> 1,5(1 ) g /b0> t1 + t2 T Y.2) 119prEN 1993-1-8 : 20037.5.2 7.5.2.1 (1) , Ni,Ed Ni,Rd , 7.5.2.1(2) 7.5.2.1(4), .(2) , 7.8 7.9, 7.10.(3) 7.9, . .: 7.10 7.9.(4) CHS RHS RHS, 7.8, 7.11, 7.12 7.13, . 7.5.2.2. 7.38: 7.10 T, Y X bi /b0 0,85 b0 /t0 10K N 0,6 12 12bb b+ 1,3 b0 /t0 15 T, Y X b0 /t0 10K N 0,6 12 12dd d+ 1,3 b0 /t0 15 120prEN 1993-1-8 : 2003 7.39: [i = 1 2,j = ] T, Y X 0,85N1,Rd = ( )51 120 0/ 1 4sin2sin 1My nt f k
,`
.| + K N 1,0Ni,Rd = 502 120 05 , 0/2 sin9 , 8Miy nbb bt f k
,`
.| + K N *) 25% ov < 50% i j , Ni,Rd = ( )5 ,/ 4 250M i iovov e eff i yit h b b t f
,`
.| + + 50% ov < 80%Ni,Rd =[ ]5 ,/ 4 2M i i ov e eff i yit h b b t f + + ov 80%Ni,Rd =[ ]5 ,/ 4 2M i i ov e i i yit h b b t f + +beff ,be,ovkn beff = ii yiybt ft ft b0 00 0/10beff bi n > 0 ():kn =n 4 , 03 , 1 kn 1,0 n 0 ():kn = 1,0be,ov = ii jij yjj jbt ft ft b /10be,ov bi , /4, b1 h1 d1 b2 h2 d2.*) i . j() . 121prEN 1993-1-8 : 2003 7.40: T, X Y RHS CHS RHS [i = 1] 0,85Ni,Rd = 51 120 0/ 1 4sin2sin ) 1 (My nt f k
,`
.| + 1) = 1,0 2)Ni,Rd = 5 010/ 10sin2sinMiibth t f
,`
.|+ 0,85Ni,Rd =5/ ) 2 4 2 (M eff i i i yib t h t f + 0,85 (1 - 1/)Ni,Rd = 5 ,110 0/ 2sin2sin 3M p eiybht f
,`
.|+1) X < 90 7.12 . 2)0,85 1,0 = 0,85 = 1,0( ). /4, b1 h1 d1 b2h2 d2 . :fb = fy0 :fb = fy0( T Y)fb = 0,8 fy0 sin i( X) EN1993-1-1 : = 000sin1246 , 3yifEth
,`
.| beff = ii yiybt ft ft b0 00 0/10beff bibe,p =ibt b0 010 be.p bi n > 0 ():kn = n 4 , 03 , 1 kn 1,0 n 0 ():kn = 1,0 122prEN 1993-1-8 : 2003 7.41: RHS CHS RHS [i = 1 2] K N Ni,Rd = 502 1 2 120 0/4 sin9 , 8Miy nbh h b bt f k
,`
.| + + + Ni,Rd = 50/sin 3Miv yA fN0,Rd=( ) ( )52, 0 0 0/ / 1M Rd pl Sd y v y vV V f A f A A ]]]
+ Ni,Rd = ( )5/ 4 2M eff i i i i yib b t h t f + + (1 - 1/)Ni,Rd = 5 ,0 0/sin2sin 3M p e iiiiyb bht f
,`
.|+ + K N 7.10 /4, b1 h1 d1 b2 h2 d2 . Av = (2h0 + b0)t0 : = 2023411tg+ g , 1.3(). : = 0beff = ii yiybt ft ft b0 00 0/10beff bibe,p =ibt b0 010 be.p bi n > 0 ():kn = n 4 , 03 , 1 kn 1,0 n 0 ():kn = 1,0 123prEN 1993-1-8 : 2003 7.42: RHS [i = 1]0tibitb0h1N0N1,Rd =5 1 1/M eff yb t f *) b1 b0 2t0N1,Rd =5 0 1 0 0/ ) 10 2 (M yt t t f + b1 b0 2t0 N1,Rd =( )5 , 10 0/ 2 23M p eyb tt f + 0t 0hb0tiih1Nt1/b0 0,2N1,Rd =( )5 0 1 0 10 120 0/ / 1 4 / 2/ 1My mb t b hb tt f k + I H , 2 1, N1,RdI H I H, .< 2 1, .Mip,1,Rd =N1,Rd (h1 t1) 7.8:0,5 1,0b0/t0 30beff , be,pkmbeff = 11 10 00 0/10bt ft ft byybeff bi n > 0():km = ) 1 ( 3 , 1 n km 1,0n 0():km = 1,0be,p =10 0/10bt bbe.p bi*) 4.10. 124prEN 1993-1-8 : 2003(5) :Rd i opEd i opRd i ipEd i ipRd iEd iMMMMNN, ,, ,, ,, ,,,+ + 1,0 ... (7.67):Mip,i,Rd Mip,i,Ed Mop,i,Rd Mop,i,Ed (6) Mi,Ed .(7) Mi,Rd 7.13 7.14, . 7.5.2.2.(8) 7.15 7.16 .7.5.2.2 (1) . , .(2) , .(3) . (4) KN, .(5) .(6) . (7) 7.17 7.18. 125prEN 1993-1-8 : 2003 7.43: RHS RHS T X ( = 90) 0,85Mip,1,Rd =5 120 0/1 1221M y nh t f k
,`
.|++ 0,85 1,0Mip,1,Rd =( )520 1 0/ 5 5 , 0M ykt h t f +fyk = fy0 T fyk = 0,8 fy0 X 0,85 1,0Mip,1,Rd = ( ) ( )5 1 1 1 1 1 (, 1/ / 1M eff p yt h b b b W f ( = 90) 0,85Mop,1,Rd = ( )( )51 0 1 20 0/1) 1 ( 21 21M y nb b ht f k
,`
.|+++ 0,85 1,0Mop,1,Rd = ( )5 0 1 0 0 0/ 5 ) (M ykt h t b t f + fyk = fy0 T fyk = 0,8 fy0 X ( T )*) Mop,1,Rd =( ) ( )5 0 0 0 0 0 0 1 0 0/ 2M yh b t h b t h t f + + 0,85 1,0Mop,1,Rd =( ) ( )5 12121 1 (, 1/ / 1 5 , 0M eff p yt b b b W f beff knbeff = 11 10 00 0/10bt ft ft byybeff b1 n > 0 ():kn = n 4 , 03 , 1 kn 1,0 n 0 ():kn = 1,0 *) . 126prEN 1993-1-8 : 2003 7.44: RHS RHS .N1,Ed N1,Rd N1,Rd N1,Rd X 7.11. 1 2 . N3NN1231 2N1,Ed sin 1 + N3,Ed sin 3 N1,Rd sin 1N2,Ed sin 2 N1,Rd sin 1 N1,Rd N1,Rd K 7.12, 02 1 2 14bh h b b + + + : 03 2 1 3 2 16bh h h b b b + + + + + .N1,Ed sin 1 + N2,Ed sin 2 Nx,Rd sin x Nx,Rd Nx,Rd X 7.11, Nx,Rdsin x :N1,Rd sin 1 N2,Rd sin 2 1 2 .Ni,Ed Ni,Rd Ni,Rd Ni,Rd K 7.12, , 1-1, :2(, , 0, 02(, , 0, 0]]]]
+]]]]
Rd pEdRd pEdVVNN 1,0 127prEN 1993-1-8 : 2003 7.45: RHS 1 , EN 1993-1-1.NEd 0,2Np,RdRd pEdRd pEdMMNN(, (,+ 90 : = [ ]0 08 , 00 00 0/ 2 11// 3h bt bh b++90 < 180: =( )( )901 ) 2 / cos( 2 1 90 = 90.tp1,5t 10 mmRd pEdRd pEdMMNN(, (,+ 1,0 ijI m a g i n a r y e x t e n s i o no f c h o r d Ni,EdNi,RdNi,Rd Ni,Rd K N 7.12. 128prEN 1993-1-8 : 2003 7.46: T, Y X RHS CHS RHS [ i = 1 ] , p 0,85p ( )i p piib b bh + sini ih sin / 5 , 1 bp b0 2t0Ni,Rd = ( )xb bt fi p ip yp sin / 12 5/ / 1 4sin/ 2M p iip ib bb hx
,`
.| + p 0,85p ( )i p piib b bh + sin i ih sin / 5 , 1bp b0 2t0Ni,Rd Ni,Rd T, X Y 7.11, kn = 1,0 t0 tp . p i ih sin / 5 , 1Ni,Rd Ni,Rd T, X Y 7.11, t0 (t0+tp ) . 129prEN 1993-1-8 : 2003 7.47: K N RHS CHS RHS [i = 1 2] , p
,`
.|+ +2211sin sin5 , 1 hghbpb02t0tp2t1 2t2Ni,Rd Ni,Rd K N 7.12, t0 tp , . p
,`
.|+ +2211sin sin5 , 1 hgh Ni,Rd Ni,Rd K N 7.12 t0 ( t0+tp) . tobotott 12N2N1tp2t1 2t2Ni,Rd Ni,Rd K N 7.12 ov < 80%, bj, tjfyj bp, tpfyp be,ov 7.10. 130prEN 1993-1-8 : 20037.5.3 (1) , 7.5.2, 7.5.3(2).(5) 7.19 , 7.5.2 . 7.48: TT 60 90 1 = 0,9 XX 1 2 . N2,Ed/N1,Ed . = ( )Ed EdN N, 1 , 2/ 33 , 0 1 9 , 0 + N1,Ed N2,Ed N2,Ed N1,Ed KK60 90 = 0,9 , 1-1, :2, 0 (,, 02, 0 (,, 0]]]]
+]]]]
Rd pEdRd pEdVVNN 1,0 131prEN 1993-1-8 : 20037.6 CHSRHS I H(1) 7.21 7.22, , 7.20. 7.49: CHS RHS I H [ i = 1 2,j = ]dw/twbi /ti hi /ti di /tihi /bib0/tfbi /bj X 1dw 400 mm 1iith 35iitb 35iitd 50 iith 35iitb 35iitd 50 0,5 2,0 2T Y 2dw 400 mm1,0 K N K N 0,5 2,0 0,75 (2) 7.20 . .(3) 7.20 7.2.2. , , .(4) , Ni,Ed Ni,Rd , 7.21.(5) :Rd i ipEd i ipRd iEd iMMNN, ,, ,,,+ 1,0 ... (7.68):Mip,i,Rd Mip,i,Ed . 132prEN 1993-1-8 : 2003 7.50: RHS CHS I H [ i = 1 2,j = ] T, Y X 1botw ohtfN1b1h 11trN1,Rd = 510/sinMw w yb t f N1,Rd =5 1 1/ 2M eff yp t f K N [i = 1 2] :g/tf 20 28 ; 1,0 0,03 = b0/2tf CHS:0,75 d1 / d2 1,33 RHS:0,75 b1 / b2 1,33Ni,Rd =510/sinMw w yb t f Ni,Rd = 5/ 2M eff i yip t f Ni,Rd =50/sin 3Miv yA fN0,Rd =( ) ( )52, 1 0 0 0/ / 1M Rd p Ed y v y vV V f A f A A ]]]
+ K N *)[i = 1 2] 25% ov < 50% i j .Ni,Rd =( )5 ,/ 50 / ) 2 (M ov i i ov e eff i yit h b p t f + + 50% ov < 80%Ni,Rd =( )5 ,/ 2M i i ov e eff i yit h b p t f + + ov 80%Ni,Rd =( )5 ,/ 4 2M i i ov e i i yit h b b t f + +Av = A0 (2 ) b0 tf + (tw + 2r) tf RHS: = ( )223 / 4 11ft g + CHS: = 0peff =yi y f wf f t r t / 7 20+ +peff bi+hi-2ti T,Y,X K,N beff bi+hi-2ti K N .bw = ( ) r thfii+ +5sin bw 2ti + 10 (tf + r)be,ov = ii yij yjj jbt ft ft b /10 be,ov biCHS /4, b1h1 d1 b2 h2 d2. *) i . j() . 133prEN 1993-1-8 : 2003(6) Mi,Ed , .(7) Mip,1,Rd 7.22.(8) ( 7.60), Ni,Rd T-,X-,Y-,K- N- ( 7.51) :Ni,Rd = 2 fyi ti (beff + beff,s) / M5... (7.69):beff =tw + 2r + 7 tf fy0 / fyi bi + hi - 2tibeff,s=ts + 2a + 7 tf fy0 / fyi bi + hi - 2tibeff + beff,sbi + hi - 2ti:a , '2a' 'a' s .(9) . 7.51: I H [i = 1 2,j = ] T Y Mip,1,Rd =5 1 0/ 5 , 0M w w yh b t f Mip,1,Rd =5 1 1 1 1/ ) (M eff yt h b t f beffbwbeff =1 0/ 7 2y y f wf f t r t + +beff bibw = ( ) r thf + +5sin11bw ( ) r t tf+ +10 21 134prEN 1993-1-8 : 2003 , () () 7.60: 7.7 CHS RHS (1) 7.24, 7.23.(2) .(3) , N0,Rd , . EN 1993-1-1. 7.52: CHS RHS [ i = 1 2,j = ]bi /b0bi /ti hi /ti di /tihi/bib0 /t0 bi/bj-K N 0,4b0 400 mm 1iith 35iitb 35iitd 50iith 35iitb 35iitd 50 0,5 2,0 20,5(1-*) g/b0* 1,5(1-*) 1)g t1 + t2K N 0,25b0 400 mm25% ov < 100%bi/bj 0,75* = b1/b0*b0* = b0 - 2 (tw + r0)1) 0,85. 135prEN 1993-1-8 : 2003 7.53: CHS RHS [i = 1 2, j = ] K N ttrbhw0000N bjjht jjjtbNhiiiiiNi,Rd =( )5/ 4 2M i i eff i i yit h b b t f + + Ni,Rd =50/sin 3Miv yA fN0,Rd= ( ) ( )52, 0 0 0/ / 1M Rd pl Ed y v y vV V f A f A A ]]]
+ K N *) 25% ov < 50%ttbhw000N bjjht jjjtbNhiiiiir 0Ni,Rd =( ) ( )5 ,/ 50 / 4 2M ov i i ov e eff i yit h b b t f + + 50% ov < 80%Ni,Rd =( )5 ,/ 4 2M i i ov e eff i yit h b b t f + + ov 80%Ni,Rd =( )5 ,/ 4 2M i i ov e i i yit h b b t f + +Av = A0 (1 ) b0* t0 b0* = b0 - 2 (tw + r0) RHS: = ( )2 23 / 4 11ft g + CHS: = 0Vpl,Rd = 50/3Mv yA fVEd = (Ni,Ed sin i )maxbeff = ii yiybt ft ft b0 00*0/10 beff bibe,ov = ii yij yjj jbt ft ft b /10 be,ov bi CHS , , /4 b1 h1 d1 b2 h2 d2.*) i . j()
