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Civil-Comp Proceedings
ISSN 1759-3433 CCP: 73
PROCEEDINGS OF THE EIGHTH INTERNATIONAL CONFERENCE ON CIVIL AND STRUCTURAL ENGINEERING COMPUTING Edited by: B.H.V. Topping
Paper 55
Derivation and Parametric Study of a Damaged Reinforced Concrete Element Y. Liu, C.K. Soh and Y.X. Dong
School of Civil and Structrual Engineering, Nanyang Technological University, Singapore Full Bibliographic Reference for this paper
Y. Liu, C.K. Soh, Y.X. Dong, "Derivation and Parametric Study of a Damaged Reinforced Concrete Element", in B.H.V. Topping, (Editor), "Proceedings of the Eighth International Conference on Civil and Structural Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 55, 2001. doi:10.4203/ccp.73.55
Keywords: bond-slip, concrete-rebar interface, damage, damaged reinforced concrete element, finite element, reinforced concrete.
Summary
In the finite element analysis of reinforced concrete, the most widely used approach
is to model the concrete, reinforcement bars (rebars) and concrete-rebar interface
separately, whereby the bond-slip on the interface is modeled using bond-link elements
or dimensionless contact elements. Hence, in most cases, many elements are needed for
accurate results to be obtained especially when 3-dimensional analysis is carried out.
In cases of complicated arrangement of rebars, as it is in the common engineering
applications, the modeling will be a laborious job. Further more, according to
experimental observations, there are interactions between concrete cracking and bond
deterioration which are difficult to take into account using this type of concrete-
interface-rebar meshing.
In this paper, effort has been made to integrate concrete, rebar and concrete-rebar
interface into a reinforced concrete element. The degradation of the material (concrete,
rebar and concrete-rebar interface) behaviors is described using continuum damage
mechanics, so the element is named as damaged reinforced concrete (DRC) element.
The DRC element consists of a 2-node rod element for the rebar, a 4-node interface
element for the concrete-rebar interface and a 10-node brick element for the concrete.
The tension mode of the rebar and the slip mode of the interface are considered in the
rod element and the interface element, respectively. The 10-node concrete element is
developed from an 8-node isoparametric element, with an additional displacement mode
introduced to account for the shear deformation induced by bond stress from the
concrete-rebar interface. As a result of these deformation modes, 3 damages are defined in
reference[1], i.e. the bond damage
Of the three kinds of damages, the local damage
where ![]() ![]() ![]() In the DRC element, the material performances of the concrete, rebar and the concrete-rebar interface are all modeled using damage mechanics, and these descriptions by damage scalars made it easier to consider the interaction between the concrete weakening and the bond deterioration. The yielding of the steel bar is also described using a damage scalar, so that the effect of rebar yielding on the bond behavior can be taken into account.
In the DRC element, the evolution equations of the non-local damage Finally, the limitations of the DRC element and the further work are also discussed. References
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