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BGSCMC07ExProb.xls

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  A B eginners Guide to the Steel Construction Manual last modified: 10 Aug Example 7.1  by: TB !oad "ead#" 1 $!% 1& ft !i'e# ! 1(& $!y ) ft Sno* # S 2 Solution: Solution Summary: +s#e, !-." AS" +art Section Steel /is /is a 310415 A552 1 17(66 127(17 b SS10464182 A&00 Gr B# -ect SS 901(2 92)(2& c SS7(&0040(&00 A&00 Gr B# -nd SS 21&(69 299(2  ASCE 7 Load Combinations: !oad "ead#" 1 22(2; !i'e# ! 1(& 99(9; Sno* # S 2 66(6; The controlling load case is !-." !C<9c The controlling load case is AS" Comosite load factor for !-.": 1(91 Comosite load factor for AS": part (a)  310415 &0 si  A552 =rient column so that t he strong a%is is associ ated *ith the largest $ Chec !ocal Bucling Criteria: SCM T able B6(1 Case Coeff( -atio Actual !imit Act8!imit 9 0(&) bf82tf &(05 19(65 0(977 >ot Slender  10 1(65 h8t* 9&(6 9&( 0(57 >ot Slender  +art of + s#e, +art of + s#e, + s#e, + s#e, + s#e, + u  ? + s#e, . y  Given: T he fol lo*i ng members are be ing c onside red fo r use a s a co ncentr ical ly lo aded co lumn( The c lengths# $!# of 1& ft in one direct ion and ) ft in the orthogonal direction( The load consists of 1 art "e !oad and 1(& art Sno* !oad( a 310%15 b -ectangular SS 10%6%182 c -ound SS 7(&%0(&00 Wanted: "etermine the caac ity of e ach secti on f or e ach condit ion( Consi der both AS" an d !- ."# e% comarable terms(
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Example 7.1A Beginners Guide to the Steel Construction Manuallast modified: 10 Aug 2007Example 7.1by: TBQLoadPart of Ps,eqDead,D1KLx15ftLive, L1.5KLy6ftSnow, S2Solution:Solution Summary:Ps,eqLRFDASDPartSectionSteel(kips)(kips)aW10X19A992117.44127.17bHSS10X4X1/2A500 Gr B, Rect HSS301.28326.25cHSS7.500X0.500A500 Gr B, Rnd HSS215.43233.28ASCE 7 Load Combinations:LoadPart of Ps,eqDead,D122.2%Ps,eqLive, L1.533.3%Ps,eqSnow, S244.4%Ps,eqThe controlling load case is LRFD LC-3cThe controlling load case is ASD LC-4 and LC-6 equally controlComposite load factor for LRFD:Pu =1.31Ps,eqComposite load factor for ASD:Ps =0.806Ps,eqpart (a)W10X19Fy50ksiA992Orient column so that the strong axis is associated with the largest KLCheck Local Buckling Criteria: SCM Table B4.1CaseCoeff.RatioActualLimitAct/Limit30.56bf/2tf5.0913.490.377Not Slender101.49h/tw35.435.880.987Not SlenderUse SCM Section E3Compute Slenderness ValuesDirectionrKL/r(in)Stong4.1443.48Weak0.87482.38