ABSTRACT
Lower bound moment of inertia for positive moment Ratio of connection to beam stiffness Width of seat angle Beam span Non-dimensional joint moment capacity according to EC36 and EC47 Bending moment Moment capacity at service load rotation Moment capacity at ultimate load rotation Maximum construction moment Design dead load moment Fixed end moments for service loads Fixed end moment for factored loads Plastic moment capacity of a beam Plastic moment capacity of steel section alone Plastic moment capacity of composite section service load moment at support Factored load moments at support Maximum centreline moment at ultimate Ultimate live load moment at the connection Ultimate live load moment assuming simple supports Modular ratio Axial force Elastic section modulus of the steel beam Thickness of flange cleat Thickness of the web Shear force Shear force on an individual bolt Shear capacity of the pane zone in an r.c. column
502 R. T. Leon and R. Zandonini
Vs Shear capacity of the panel zone in a steel column
Vw Shear capacity of the steel panel Y2 Distance from top of the beam to centre of slab
force Zs Plastic section modulus of the steel beam
8 Vertical displacement () Absolute rotation >. Load multiplier p Steel reinforcement ratio a Normal stress T Shear stress
<P relative rotation, joint rotation <Pj Joint rotation <I> Non-dimensional joint rotation defined accord-
ing to EC36 and EC47 <Ps <P under service loads <Pu Ultimate value of <P
<Psr,s <P at intersection of service beam line and M-8 curve
<Psr,u <P at intersection of factored beam line and M-8 curve
<Ps,s support rotation for s.s. beam under service loads
<Ps,u Support rotation for s.s. beam under factored loads
1. INTRODUCTION
Over the past 20 years composite construction has become increasingly popular for two major reasons. 1 First, there have been important advances in shear connection technology, i.e. the widespread use of headed studs. Second, composite construction has many inherent advantages, including speed and ease of erection and reductions in storey height. Many new composite floor systems have been developed to address the growing demand for large open working spaces and reduced storey heights. Stub girder systems and composite trusses are two examples of such floor systems. These systems reduce the amount of cladding and building services required, and provide sufficiently broad floor area in multistorey buildings when strict height limitations exist.
