This paper presents an analytical model for the analysis of composite steel-concrete bridges. The particularity of the proposed model is its ability to combine the shear deformability of the shear connection (i.e. partial interaction theory) with the one of the steel component. This is obtained by coupling an Euler-Bernoulli beam for the reinforced concrete slab to a Timoshenko beam for the steel beam. The balance conditions are derived using the principle of virtual work and the weak form of the problem is presented. The steel of the beam and the steel of the slab reinforcement are modelled by using linear elastic laws, while the time-dependent behaviour of the slab concrete is included by using a general linear viscous-elastic integral-type constitutive law. The numerical solution is obtained by means of the finite element method implementing a time-stepping procedure based on which extensive parametric study is carried out on approximately 100 realistic three-span composite beams. The numerical results obtained with the proposed model are compared to those of the composite beam model with partial shear interaction that does not include the shear deformability of the steel beam.
The effects of shear deformations of the steel member on the behaviour of composite steel-concrete bridges
ZONA, Alessandro
2009-01-01
Abstract
This paper presents an analytical model for the analysis of composite steel-concrete bridges. The particularity of the proposed model is its ability to combine the shear deformability of the shear connection (i.e. partial interaction theory) with the one of the steel component. This is obtained by coupling an Euler-Bernoulli beam for the reinforced concrete slab to a Timoshenko beam for the steel beam. The balance conditions are derived using the principle of virtual work and the weak form of the problem is presented. The steel of the beam and the steel of the slab reinforcement are modelled by using linear elastic laws, while the time-dependent behaviour of the slab concrete is included by using a general linear viscous-elastic integral-type constitutive law. The numerical solution is obtained by means of the finite element method implementing a time-stepping procedure based on which extensive parametric study is carried out on approximately 100 realistic three-span composite beams. The numerical results obtained with the proposed model are compared to those of the composite beam model with partial shear interaction that does not include the shear deformability of the steel beam.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
