ABSTRACT

Ac Cross-sectional area of concrete block between the longitudinal shear planes (mm2), or effective area of concrete slab - for shrinkage deflection calculation (mm2)

Acv Total longitudinal shear area at the shear planes (mm2)

Ap Pullout concrete cone area - as affected by deck profile, over-lapping cones, slab free edge, and stud fusion burn-off (mm2)

Ad Cross-sectional area of longitudinal steel between the longitudinal shear planes (mm2)

(MPa)

Fry Specified minimum yield strength of steel reinforcement (MPa)

section (mm4) It Transformed moment of inertia of a composite

section (mm 4) Is Moment of inertia of a steel section (mm4) L Beam or girder span (mm) M f Maximum positive factored bending moment

(kN.m) Mfl Factored positive moment at the location con-

(kN.m) M rc Factored moment resistance of a composite sec-

tion (kN.m) Msh Uniform beam moment for shrinkage deflection

computation (N.mm) n The number of single-or multiple-stud shear con-

nections to be distributed within the region from point of maximum moment (Mf) to the adjacent zero moment location, or elastic modular ratio E/ Ec

n' No. of connections between zero moment point and the adjacent location of point load

N No. of stud(s) in a concrete rib as a shear connection p Fraction of full shear connection (use 1·00 for full

shear connection) qr Factored shear resistance of a connector situated

in a concrete rib (N)

472 1.K. Ritchie and E. Y.L Chien

qu Ultimate strength of a stud connector situated in solid slab (N)

Qrib Allowable load for a stud shear connector embedded in concrete rib (N)

Q801 Allowable shear resistance of a stud connector in solid slab (N)

tension (N) Vh Factored shear force at steel-concrete interface

within the region from point of maximum moment to the adjacent zero moment location

(N) Mass density of concrete (kg/m3) Average rib width (mm) Distance from elastic neutral axis to centre of cover slab (mm)

Restrained shrinkage of concrete slab (micro strain) Performance factor for steel (0'9) Performance factor for concrete (0'6) Performance factor for shear connectors (0·8) 1·0 for ND concrete (2150-2500 kg/m3), 0'85 for SLD concrete (1850·2150 kg/m3) Total factored shear resistance of the stud groups within a shear span (N)

This chapter deals with those components normally used to construct compositely designed floors in North American buildings. Individual components such as steel deck and its concrete cover slab may be designed compositely while the rest of the structure remains non-composite. However, in most buildings with structural spans of 9 m or larger, both the deck and some or all of the floor framing members are compositely designed.