TY - JOUR
T1 - GBT-based time-dependent analysis of steel-concrete composite beams including shear lag and concrete cracking effects
AU - Henriques, David
AU - Gonçalves, Rodrigo
AU - Sousa, Carlos
AU - Camotim, Dinar
N1 - SFRH/BD/139585/2018
Sem PDF conforme despacho.
PY - 2020/5/1
Y1 - 2020/5/1
N2 - In this paper, a GBT-based finite element previously developed by the authors for steel-concrete composite beams, which incorporates cross-section deformation (including shear lag effects) and concrete creep, is enhanced by including concrete cracking effects. In particular, a fixed smeared crack model with two orthogonal cracks is consistently combined with creep using a strain decomposition approach. As in the previous finite element, creep is modelled using a linear visco-elastic law and a Dirichlet series expansion of the creep function. A set of illustrative numerical examples is presented, to show the capabilities of the proposed element. For comparison purposes, shell finite element model results are provided. It is demonstrated that the proposed element makes it possible to obtain very accurate results with a relatively small number of cross-section deformation modes (cross-section DOFs) and finite elements, thus leading to significant computational savings with respect to shell element models.
AB - In this paper, a GBT-based finite element previously developed by the authors for steel-concrete composite beams, which incorporates cross-section deformation (including shear lag effects) and concrete creep, is enhanced by including concrete cracking effects. In particular, a fixed smeared crack model with two orthogonal cracks is consistently combined with creep using a strain decomposition approach. As in the previous finite element, creep is modelled using a linear visco-elastic law and a Dirichlet series expansion of the creep function. A set of illustrative numerical examples is presented, to show the capabilities of the proposed element. For comparison purposes, shell finite element model results are provided. It is demonstrated that the proposed element makes it possible to obtain very accurate results with a relatively small number of cross-section deformation modes (cross-section DOFs) and finite elements, thus leading to significant computational savings with respect to shell element models.
KW - Concrete cracking
KW - Concrete creep
KW - Cross-section deformation
KW - Generalised beam theory (GBT)
KW - Shear lag
KW - Steel-concrete composite beams
UR - http://www.scopus.com/inward/record.url?scp=85081672536&partnerID=8YFLogxK
U2 - 10.1016/j.tws.2020.106706
DO - 10.1016/j.tws.2020.106706
M3 - Article
AN - SCOPUS:85081672536
SN - 0263-8231
VL - 150
JO - Thin-Walled Structures
JF - Thin-Walled Structures
M1 - 106706
ER -