1,721,213 research outputs found
Compressive and thermal properties of recycled EPS foams
No full textOptimization of moulding process in order to maximize the recycled fraction in EPS products is a key industrial goal. To this end effects of quality and quantity of recycled EPS upon physical properties of products are studied. Results show, on the one hand, that the introduction of a recycled fraction brings to products with a reduced density. On the other hand, small modifications of the process parameters allow for a reduction in this density decrease. Furthermore, results show that mechanical and thermal behaviour of EPS depend only on the materials density apart from the possible presence of a recycled fraction
Behaviour of bond between concrete and steel in a large post-yelding field
No full textThe bond-slip relationship between concrete and steel is very important in evaluating the non-linear behaviour of reinforced concrete structures. In this paper, the problem is analysed for reinforced concrete elements in tension. Two different analytical approaches are applied in order to estimate their performances. This research underlines the importance of bond-slip modeling in a steel post-yielding field by comparison among three well-known, different bond-slip relationships. Moreover, the results of simple experimental tests on reinforced concrete tensile elements are shown to assess the reliability of previously proposed models in the elastic range and to confirm that an appropriate model for the post-yielding range of behaviour is necessary
Evaluation of the plastic rotation of steel-concrete composite beams under hogging moment by FE modelling
No full textThe issue of the plastic rotational capacity has a fundamental role in the seismic analysis of framed
structures, above all because the approach with lumped plasticity, in respect of the spread plasticity
approach, seems to be more suitable for the non-linear analysis of entire buildings Moreover, this
approach is based on well know and reliable formulations for the concrete structures and also for the steel
ones, while no specific rule is set for the composite structures. This paper reports a tri-dimensional FE
model of a composite beam under hogging moment in which all the features of the materials and the
interaction effects are considered.
The FE model has been used for the development of a parametric analysis in order to study the effect of
the different parameters on the rotational capacity of the composite beams. Finally, the obtained results
have permitted to define an equivalent plastic hinge length that multiplied by the plastic curvature of the
cross-section provides the available plastic rotation
Modellazione FEM di un collegamento di base per colonne composte acciaio-calcestruzzo parzialmente rivestite
No full text
The non-linear model of embedded steel–concrete composite column bases
No full textThis paper analyses the base connection of partially encased composite columns while considering the solution of embedding the column in a concrete foundation block. The base connection is formed by a socket-type joint that is used for RC pre-cast columns, avoiding the brittle failure that usually occurs in traditional base joints made of plates and bolts due to crashing of the welds and degradation of the bonding. The experimental results from previous tests showed that the innovative joint is more ductile than the traditional joint, but the detailed analysis developed in this paper demonstrates that the fixed end rotation contributes to the global ductility of the joint. A non-linear 3D FE model is constructed and calibrated from the experimental results and is then used for parametric analyses. The influence of the embedded height is examined by determining its value that exploits the entire resistance of the column before the base concrete fails. Another parametric study using the 3D FE model is performed to define the elastic rigidity of the connection. Finally, a simple mono-dimensional model is assessed with a non-linear spring at the base that takes into account the elastic rigidity and the plastic behaviour of the base joint
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