Because high material strength and composite load-bearing are emphasized in constructing members for high-rise steel frame structures

in a composite connection

steel strength has a dramatic influence on both the bearing performance and the composite action of the concrete slab. Based on a finite element analysis

we discuss the composite effect and the connection breaking mode

focusing on the performance change of the composite effect in adopting high strength steel. It can be found from the results that

along with the improvement of the steel strength

the elastic and plastic ultimate strength of the composite connection will increase

the ductility will decrease to a certain extent

and the composite effect of the concrete slab will diminish. The collapse of the concrete in a positive moment side contacting the column flange is viewed as the limiting state of the connection.