Draft

9.3UltimateStrengthMethod 169

Type of Load/Member

AISC

DL+ LL;Members 3.0

DL+ LL;Connections 4.5

DL+ LL+ WL;Members 3.5

DL+ LL+EL;Members 1.75

ACI

DuctileFailure 3-3.5

SuddenFailures 3.5-4

Table9.2:Selected valuesforSteelandConcreteStructures

 is astrengthreductionfactor, lessthan1, andmustaccount forthetype of structural

element, Table9.3.

Type of Member 

ACI

AxialTension 0.9

Flexure 0.9

AxialCompression,spiralreinforcement 0.75

AxialCompression,other 0.70

ShearandTorsion 0.85

Bearingonconcrete 0.70

AISC

Tension,yielding 0.9

Tension,fracture 0.75

Compression 0.85

Beams 0.9

Fasteners,Tension 0.75

Fasteners,Shear 0.65

Table9.3:StrengthReductionFactors,

Rn is thenominalresistance(orstrength).

Rn is thedesignstrength.

(^) i is theloadfactorcorrespondingtoQiandis greaterthan1.
 (^) iQi is therequiredstrengthbasedonthefactoredload:
i is thetype of load
32 Thevariousfactoredloadcombinationswhich mustbe consideredare
AISC