Full-scale long-term experiments of simply supported composite beams with solid slabs

Full-scale long-term and ultimate experiments of simply-supported composite beams with steel deck

“…4. This approach was already used by the authors in previous long-term tests on beams with solid slabs and was reported in [53]. The use of unpropped construction enabled the self-weight of the concrete to be carried out by the steel joist at the time of the pour, therefore avoiding the creep in the concrete due to this dead load.…”

“…Two constitutive relationships were considered for the shear connection: (i) one linearelastic (referred to in the following plotted results as SC LE ) where the connection stiffness k related, at all instants in time, the longitudinal force per unit length p(z,t) to the corresponding slip s(z,t), i.e. q(z,t) = ks(z,t), and (ii) a time-dependent one previously proposed by the authors in [53] (referred to in the following plotted results as SC EFF ) expressed as:…”

“…As the time-dependent behaviour of the shear connectors is related to the complex concrete stress state surrounding the studs, the expression for φ SC (t,s 0 ) was defined in [53] for solid slabs as a function of the concrete creep coefficient φ c (t,s 0 ) with α SC =0.4:…”

“…Analytical solutions were proposed to account for the non-uniform shrinkage distribution extending previous work of the authors [53,58] while considering the presence of the ribs and the time-dependent response of the shear connectors. These expressions have been validated against the proposed experimental results and, for their ease of use, are suitable for design calculations.…”

“…Recently the authors have conducted a set of experiments aimed at evaluating the longterm behaviour and its effect on the ultimate behaviour of composite beams designed with partial shear connection formed by a steel joist and a solid slab (i.e. without steel deck) [53][54].…”