0000000000131349
AUTHOR
L Cavaleri
Strength and ductility of confined concrete columns under axial load and biaxial bending
The behaviour of prismatic reinforced concrete columns under increasing eccentric compression load was experimentally investigated and analytically modelled. Columns with distributed longitudinal reinforcement and closely spaced transverse reinforcement were tested up to failure, considering different values and directions of eccentricity. Preliminary tests were carried out under concentric compression in order to validate the choice of the stress-strain laws adopted for the confined concrete and the longitudinal steel bars in compression. In the paper, closed form expressions able to approximate the experimental results in the case of uniaxial bending are presented. Finally, a fibre numeri…
Strutture intelaiate e tamponate in c.a.: sperimentazione e sviluppi nella modellazione analitica e numerica
The presence of masonry infills in RC structures may have a fundamental role in response under seismic excitation, especially in the case of structures designed for gravity loads only and without seismic details. Studies of many authors show important modifications of response in terms of strength, stiffness, ductility and safety evaluation. The recent large development of nonlinear seismic, static and dynamical methods requires a relevant effort in modelling with a reliable, and at the same time easy for practical using, constitutive laws for infill panels. In this context the present study provide an experimental investigation on single story, single bay, half scale frames, fully infilled…
On the definition of seismic vulnerability maps in cross-border Mediterranean areas
The chance to locate and quantify the major risks associated to natural catastrophic events on a territory allows to plan adequate strategies and interventions by civil protection bodies involved in local and international emergencies. The seismic risk depends most of all by the vulnerability of buildings belonging to the urban areas. For this reason the definition, by a deep analysis of the territory, of instruments identifying and locating vulnerability, largely favours the activities of institutions appointed to safeguard the safety of citizens. Seismic and hydro-geological risks constitute the major component of the activities involving assistance actions carried out by civil protection…
Steel jacketing of RC columns: Reliability of capacity laws for concrete
In the seismic assessment of framed R.C. structures reinforced by steel angles and battens (steel jacketing) the use of proper confinement models for concrete is still a main topic. Really, the capacity of reinforced concrete columns under concentric and eccentric loads strongly depends on confinement exerted by the external reinforcement. Further a proper attribution of concrete stress-strain laws allows obtaining reliable estimations of inelastic capacity of reinforced elements. Moreover the presence (or not) of connections of the angles with the end joints influences their capacity to support vertical loads. In the two cases the mechanical models have to account for buckling or frictiona…