Search results for "ABAQUS"
showing 4 items of 4 documents
A strategy for the finite element modeling of FRP-confined concrete columns subjected to preload
2018
Abstract Compressive behavior of columns strengthened by means of an outer elastic confinement provided e.g. by fiber-reinforced polymer (FRP) jackets has become a main topic in the field of structural retrofitting. In details, the problem of the response assessment of strengthened columns is still under study. Many analytical formulations have been proposed to describe the compressive behavior of confined concrete under both monotonic and cyclic loads. However, the effect of a stress/strain level in the columns already present prior to apply the confinement has been generally neglected until now, also because of the lack of well defined strategies of modeling. In this frame, here, (1) a FE…
Capacità in compressione di colonne in calcestruzzo confinato con FRP/Acciaio in presenza di precarico
2017
Nell'ambito del recupero e rinforzo delle costruzioni esistenti, il confinamento di colonne in calcestruzzo armato con materiali polimerici fibro-rinforzati (FRP) e la tecnica di incamiciatura tramite il sistema combinato di angolari e piatti in acciaio (Steel Jacketing) risultano molto utilizzate, in quanto offrono notevoli vantaggi in termini di incremento della capacità portante e deformativa agli elementi strutturali che presentano carenze di requisiti sismici. L'esecuzione dell'intervento di rinforzo in condizioni di esercizio della struttura implica la presenza di uno stato tenso-deformativo esistente nelle colonne, causato dalla presenza dei carichi gravitazionali. Questo può comport…
On the numerical implementation of a 3D fractional viscoelastic constitutive model
2015
The aim of this paper is the implementation of a 3D fraction al viscoelastic constitutive law in a user material subroutine (UMAT) in the finite element software Abaqus. Essential to the implementation of the model is access to the strain history at each Gauss point of each element in a constructive manner. Details of the UMAT and comparison with some analytical results are presented in order to show that the fractional viscoelastic constitutive law has been successfully implemented.
FE modeling of Partially Steel-Jacketed (PSJ) RC columns using CDP model
2018
This paper deepens the finite element modeling (FEM) method to reproduce the compressive behavior of partially steel-jacketed (PSJ) RC columns by means of the Concrete Damaged Plasticity (CDP) Model available in ABAQUS software. Although the efficiency of the CDP model is widely proven for reinforced concrete columns at low confining pressure, when the confinement level becomes high the standard plasticity parameters may not be suitable to obtain reliable results. This paper deals with these limitations and presents an analytically based strategy to fix the parameters of the Concrete Damaged Plasticity (CDP) model. Focusing on a realistic prediction of load-bearing capacity of PSJ RC column…